WEATHERFORD INTERNATIONAL INC
S-4, 1995-08-29
OIL & GAS FIELD MACHINERY & EQUIPMENT
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 29, 1995

                                                    REGISTRATION NUMBER 33-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                     WEATHERFORD INTERNATIONAL INCORPORATED
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                           <C>                           <C>
          DELAWARE                        1389                    74-1681642
(State or other jurisdiction  (Primary Standard Industrial     (I.R.S. Employer
             of
      incorporation or        Classification Code Number)    Identification No.)
       organization)
</TABLE>

                      1360 POST OAK BOULEVARD, SUITE 1000
                              HOUSTON, TEXAS 77056
                                 (713) 439-9400
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                               H. SUZANNE THOMAS
              SENIOR VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                     WEATHERFORD INTERNATIONAL INCORPORATED
                      1360 POST OAK BOULEVARD, SUITE 1000
                              HOUSTON, TEXAS 77056
                                 (713) 439-9400
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                   COPIES TO:

<TABLE>
<S>                                           <C>
             CHARLES L. STRAUSS                              DAVID R. KING
        FULBRIGHT & JAWORSKI L.L.P.                     MORGAN, LEWIS & BOCKIUS
         1301 MCKINNEY, SUITE 5100                       2000 ONE LOGAN SQUARE
         HOUSTON, TEXAS 77010-3095               PHILADELPHIA, PENNSYLVANIA 19103-6993
               (713) 651-5151                                (215) 963-5000
</TABLE>

                            ------------------------

    APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED  SALE OF THE SECURITIES TO THE
PUBLIC: Upon consummation of the merger described herein.

    If the  securities  being registered  on  this  Form are  being  offered  in
connection  with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  / /

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                                     PROPOSED
                                                    PROPOSED          MAXIMUM
                                    AMOUNT           MAXIMUM         AGGREGATE        AMOUNT OF
    TITLE OF EACH CLASS OF           TO BE       OFFERING PRICE   OFFERING PRICE    REGISTRATION
 SECURITIES TO BE REGISTERED    REGISTERED (1)    PER UNIT (2)          (2)            FEE(3)
<S>                             <C>              <C>              <C>              <C>
Common Stock, $.10 par value..    24,100,000     Not applicable   $595,504,577.16    $205,346.41
</TABLE>

(1) Represents  the  maximum number  of  shares of  Weatherford's  Common  Stock
    issuable upon consummation of the Merger described herein.

(2)  Pursuant to Rule 457(c)  and Rule 457(f) under  the Securities Act of 1933,
    the proposed maximum offering  price is calculated  as the aggregate  market
    value  of the Enterra Common Stock subject  to the Merger, which is based on
    the average of  the high  and low  sale prices  of Enterra  Common Stock  as
    reported on the New York Stock Exchange on August 24, 1995.

(3)  In  accordance with  Rule  457(b) under  the  Securities Act  of  1933, the
    registration fee included with this  Registration Statement has been  offset
    by  the $116,200 that was previously paid  by the Registrant with the filing
    of preliminary proxy materials  on Schedule 14A  (which contained the  Joint
    Proxy Statement/Prospectus included herein) filed on August 3, 1995 with the
    Commission.
                            ------------------------

    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT  SHALL THEREAFTER BECOME EFFECTIVE IN  ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT  OF 1933 OR  UNTIL THIS REGISTRATION  STATEMENT SHALL  BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                     WEATHERFORD INTERNATIONAL INCORPORATED
        CROSS REFERENCE SHEET PURSUANT TO ITEM 501(B) OF REGULATION S-K

<TABLE>
<CAPTION>
                        ITEM OF FORM S-4                                       LOCATION IN THE PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
<C>        <S>                                                    <C>
       1.  Forepart of Registration Statement and Outside Front
            Cover Page of Prospectus............................  Cover of Registration Statement; Cross Reference
                                                                   Sheet; Outside Front Cover Page of Prospectus
       2.  Inside Front and Outside Back Cover Pages of
            Prospectus..........................................  Inside Front Cover Page of Prospectus; Available
                                                                   Information; Table of Contents; Incorporation of
                                                                   Certain Documents by Reference
       3.  Risk Factors, Ratio of Earnings to Fixed Charges and
            Other Information...................................  Summary; Special Considerations; Weatherford
                                                                   International Incorporated; Enterra Corporation; The
                                                                   Merger; Market Price of Common Stock; Weatherford
                                                                   and Enterra Combined Unaudited Pro Forma Financial
                                                                   Information; Weatherford Selected Financial Data;
                                                                   Enterra Selected Financial Data
       4.  Terms of the Transaction.............................  Summary; The Merger; Terms of the Merger; Comparative
                                                                   Rights of Stockholders of Weatherford and Enterra
       5.  Pro Forma Financial Information......................  Summary; Weatherford and Enterra Combined Unaudited
                                                                   Pro Forma Financial Information; Weatherford
                                                                   Selected Financial Data; Enterra Selected Financial
                                                                   Data
       6.  Material Contacts with the Company Being Acquired....  Not Applicable
       7.  Additional Information Required for Reoffering by
            Persons and Parties Deemed to be Underwriters.......  Not Applicable
       8.  Interests of Named Experts and Counsel...............  Legal Matters; Experts
       9.  Disclosure of Commission Position on Indemnification
            for Securities Act Liabilities......................  Not Applicable
      10.  Information with Respect to S-3
            Registrants.........................................  Available Information; Summary; Weatherford
                                                                   International Incorporated; Incorporation of Certain
                                                                   Documents by Reference
      11.  Incorporation of Certain Information by Reference....  Incorporation of Certain Documents by Reference
      12.  Information with Respect to S-2 or S-3 Registrants...  Not Applicable
      13.  Incorporation of Certain Information by Reference....  Not Applicable
      14.  Information with Respect to Registrants Other Than
            S-3 or S-2 Registrants..............................  Not Applicable
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                        ITEM OF FORM S-4                                       LOCATION IN THE PROSPECTUS
- ----------------------------------------------------------------  -----------------------------------------------------
      15.  Information with Respect to S-3 Companies............  Available Information; Summary; Enterra Corporation;
                                                                   Incorporation of Certain Documents by Reference
<C>        <S>                                                    <C>
      16.  Information with Respect to S-2 or S-3 Companies.....  Not Applicable
      17.  Information with Respect to Companies Other Than S-3
            or S-2 Companies....................................  Not Applicable
      18.  Information if Proxies, Consents or Authorizations
            are to be Solicited.................................  Prospectus Summary; General Information About The
                                                                   Meetings; The Merger; Management; Proposal to Amend
                                                                   Weatherford's Restated Certificate of Incorporation;
                                                                   Proposal to Amend Weatherford's 1991 Stock Option
                                                                   Plan; Proposal to Amend Weatherford's Restricted
                                                                   Stock Incentive Plan; Stockholders' Proposals
      19.  Information if Proxies, Consents or Authorizations
            are not to be Solicited or in an Exchange Offer.....  Not Applicable
</TABLE>
<PAGE>
Weatherford International Incorporated                             [LOGO]
1360 Post Oak Boulevard
Suite 1000
Houston, TX 77056-3098

                                                          August 31, 1995

Dear Stockholder:

    You  are  cordially  invited  to  attend  Weatherford's  Special  Meeting of
Stockholders to be  held at 10:30  a.m., Houston time,  on Thursday, October  5,
1995, at The Ritz-Carlton, 1919 Briar Oaks Lane, Houston, Texas.

    At  the Special  Meeting, you will  be asked  to consider and  vote upon the
approval and adoption of (i)  an Agreement and Plan of  Merger dated as of  June
23,  1995, as amended  (the "Merger Agreement"), that  provides for the business
combination of Enterra Corporation ("Enterra") and Weatherford through a  merger
of  Enterra  with  and into  Weatherford  and (ii)  amendments  to Weatherford's
Restated Certificate of  Incorporation to effect  a contemporaneous  one-for-two
reverse stock split of Weatherford Common Stock and to change Weatherford's name
to  "Weatherford Enterra, Inc."  Pursuant to the terms  of the Merger Agreement,
each outstanding share of Enterra Common Stock will be converted into the  right
to  receive 1.69 shares of Weatherford Common Stock, before giving effect to the
reverse stock split (0.845 of a  share of Weatherford Common Stock after  giving
effect  to the reverse stock split). You also will be asked to consider and vote
upon (i)  an  amendment to  Weatherford's  1991 Stock  Option  Plan to  make  an
additional 3,000,000 shares of Weatherford Common Stock (before giving effect to
the  reverse stock  split) available for  issuance upon the  exercise of options
granted under such plan and (ii) an amendment to Weatherford's Restricted  Stock
Incentive  Plan to make an additional 250,000 shares of Weatherford Common Stock
(before giving effect to the reverse  stock split) available for issuance  under
such plan.

    The  proposed  merger  is  subject  to  a  number  of  conditions, including
obtaining the approval of the  stockholders of Weatherford and the  stockholders
of  Enterra. A  summary of  the basic  terms and  conditions of  the merger, the
reverse stock  split, the  name change  and the  amendments to  the  Weatherford
plans,  certain  financial and  other  information relating  to  Weatherford and
Enterra and a copy of the Merger  Agreement are set forth in the enclosed  Joint
Proxy  Statement/Prospectus. Please  review and consider  the enclosed materials
carefully.

    The Weatherford  Board of  Directors  has approved  the merger,  the  Merger
Agreement,  the reverse stock split,  the name change and  the amendments to the
Weatherford plans. THE BOARD OF DIRECTORS AND MANAGEMENT BELIEVE THAT ALL OF THE
PROPOSALS TO BE PRESENTED TO THE STOCKHOLDERS AT THE SPECIAL MEETING ARE IN  THE
BEST  INTERESTS OF WEATHERFORD AND THE STOCKHOLDERS OF WEATHERFORD AND RECOMMEND
THAT YOU VOTE FOR THEIR APPROVAL AND ADOPTION.

    The Board of Directors appreciates and encourages stockholder  participation
in Weatherford's affairs. WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING,
IT  IS IMPORTANT THAT YOUR SHARES BE  REPRESENTED AND VOTED. ACCORDINGLY, WE ASK
THAT YOU MARK, DATE, SIGN AND RETURN YOUR PROXY AT YOUR EARLIEST CONVENIENCE  IN
THE ENVELOPE PROVIDED, WHICH REQUIRES NO POSTAGE IF MAILED IN THE UNITED STATES.
If you have multiple stockholder accounts and receive more than one set of these
materials,  please be sure  to vote each  proxy and return  it in the respective
postage-paid envelope provided. SHARE CERTIFICATES SHOULD NOT BE SURRENDERED FOR
EXCHANGE BY STOCKHOLDERS OF WEATHERFORD PRIOR  TO THE APPROVAL OF THE  PROPOSALS
AND THE RECEIPT OF A LETTER OF TRANSMITTAL.

    Thank you for your continued interest and cooperation.
                                                    Very truly yours,

                                                        [LOGO]

                                                    PHILIP BURGUIERES
                                             CHAIRMAN OF THE BOARD, PRESIDENT
                                               AND CHIEF EXECUTIVE OFFICER
<PAGE>
                     WEATHERFORD INTERNATIONAL INCORPORATED

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

    Notice is hereby given that a Special Meeting of Stockholders of Weatherford
International  Incorporated ("Weatherford") will be  held at 10:30 a.m., Houston
time, on Thursday, October 5, 1995,  at The Ritz-Carlton, 1919 Briar Oaks  Lane,
Houston, Texas, for the following purposes:

    1.   To consider and vote upon a proposal to approve and adopt the Agreement
       and Plan  of  Merger dated  as  of June  23,  1995, as  amended,  between
       Weatherford  and  Enterra  Corporation  ("Enterra"),  and  the  merger of
       Enterra with and  into Weatherford,  pursuant to  which each  outstanding
       share  of Enterra common  stock, $1.00 par value,  will be converted into
       the right to receive 1.69 shares of Weatherford's common stock, $.10  par
       value  ("Weatherford Common Stock"), before  giving effect to the reverse
       stock split described below (0.845 of a share of Weatherford Common Stock
       after giving effect to the reverse stock split).

    2.  To consider and vote upon a proposal to approve and adopt amendments  to
       Weatherford's  Restated  Certificate  of Incorporation  (i)  to  effect a
       contemporaneous one-for-two  reverse stock  split of  Weatherford  Common
       Stock  and  (ii) to  change Weatherford's  name to  "Weatherford Enterra,
       Inc."

    3.  To consider and vote upon  a proposal to approve and adopt an  amendment
       to  Weatherford's 1991 Stock Option Plan  to make an additional 3,000,000
       shares of Weatherford Common Stock  (before giving effect to the  reverse
       stock  split) available for issuance upon the exercise of options granted
       under such plan.

    4.  To consider and vote upon  a proposal to approve and adopt an  amendment
       to  Weatherford's Restricted Stock  Incentive Plan to  make an additional
       250,000 shares of Weatherford Common  Stock (before giving effect to  the
       reverse stock split) available for issuance under such plan.

    5.  To consider and take action upon any other matter that may properly come
       before the Special Meeting or any adjournment thereof.

    Holders  of record of Weatherford  Common Stock at the  close of business on
August 24, 1995  will be  entitled to  notice of, and  to vote  at, the  Special
Meeting  or  any  adjournment  thereof.  A list  of  the  holders  of  record of
Weatherford Common  Stock as  of  August 24,  1995 will  be  open on  and  after
September  25, 1995 to the  examination of any such  stockholder for any purpose
germane to  the  Special Meeting  at  Weatherford's  offices at  1360  Post  Oak
Boulevard, Suite 1000, Houston, Texas, during ordinary business hours.

                                           By order of the Board of Directors,

                                                          [LOGO]

                                                    H. SUZANNE THOMAS
                                                        SECRETARY

August 31, 1995
                            ------------------------

                                   IMPORTANT

    YOU  ARE CORDIALLY INVITED TO ATTEND THE  SPECIAL MEETING IN PERSON. EVEN IF
YOU PLAN  TO BE  PRESENT, YOU  ARE  URGED TO  MARK, DATE,  SIGN AND  RETURN  THE
ENCLOSED  PROXY AT  YOUR EARLIEST  CONVENIENCE IN  THE ENVELOPE  PROVIDED, WHICH
REQUIRES NO POSTAGE IF MAILED  IN THE UNITED STATES.  IF YOU ATTEND THE  SPECIAL
MEETING, YOU MAY VOTE EITHER IN PERSON OR BY YOUR PROXY.
<PAGE>
                                                                          [LOGO]
- --------------------------------------------------------------------------------

                                                                 August 31, 1995

Dear Stockholder:

    You  are cordially invited to attend  a special meeting of stockholders (the
"Special Meeting") of Enterra Corporation ("Enterra") to be held at 10:00  a.m.,
Houston time, on Thursday, October 5, 1995, at The Ritz-Carlton, 1919 Briar Oaks
Lane,  Houston, Texas. Enclosed are a Notice of Special Meeting of Stockholders,
a Joint Proxy Statement/Prospectus and a form of proxy for the Special Meeting.

    At the Special  Meeting, you will  be asked  to consider and  vote upon  the
approval  and adoption of an Agreement and Plan  of Merger, dated as of June 23,
1995, as  amended  (the "Merger  Agreement"),  that provides  for  the  business
combination    of   Enterra    and   Weatherford    International   Incorporated
("Weatherford") through  a merger  of  Enterra with  and into  Weatherford  (the
"Merger"). Pursuant to the terms of the Merger Agreement, each outstanding share
of  Enterra common stock will be converted into the right to receive 1.69 shares
of  Weatherford  common  stock,  before  giving  effect  to  a   contemporaneous
one-for-two reverse stock split of Weatherford common stock (0.845 of a share of
Weatherford common stock after giving effect to the reverse stock split).

    The business combination of Enterra with Weatherford is an important element
in   Enterra's  long-standing  strategic  plan.  Weatherford  is  a  diversified
international energy services and manufacturing company that provides a  variety
of  services and equipment to the  oil and gas industry. Weatherford's principal
businesses consist of providing  tubular handling services, renting  specialized
oilfield  equipment  and  providing  fishing  services  and  related  tools, and
manufacturing and selling cementation products and other equipment.

    The Merger is  subject to a  number of conditions,  including obtaining  the
approval  of the  stockholders of Enterra  and the  stockholders of Weatherford.
Details of  the Merger,  certain  financial and  other information  relating  to
Enterra  and Weatherford and a copy of the Merger Agreement are set forth in the
accompanying Joint Proxy Statement/Prospectus, which you should read  carefully.
You  should  also  consider  the additional  information  regarding  Enterra and
Weatherford contained in the other documents  also set forth or incorporated  by
reference in the Joint Proxy Statement/Prospectus.

    THE BOARD OF DIRECTORS HAS APPROVED THE MERGER AGREEMENT AND THE MERGER. THE
BOARD  OF DIRECTORS BELIEVES THAT THE MERGER IS IN THE BEST INTERESTS OF ENTERRA
AND THE STOCKHOLDERS OF ENTERRA AND RECOMMENDS THAT YOU VOTE FOR ITS APPROVAL.

    All stockholders are invited  to attend the Special  Meeting in person.  The
affirmative  vote of the holders  of a majority of  the shares of Enterra common
stock entitled to vote at the Special  Meeting is required for the approval  and
adoption of the Merger Agreement and the Merger.

    PLEASE DO NOT SEND ANY SHARE CERTIFICATES AT THIS TIME.

    IN ORDER THAT YOUR SHARES MAY BE REPRESENTED AT THE SPECIAL MEETING, YOU ARE
URGED  TO PROMPTLY COMPLETE, DATE, SIGN AND RETURN THE ACCOMPANYING PROXY IN THE
ENCLOSED ENVELOPE, WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING.

                                                        Sincerely,

                                                          [LOGO]

                                                       D. DALE WOOD
                                             CHAIRMAN OF THE BOARD, PRESIDENT
                                               AND CHIEF EXECUTIVE OFFICER
<PAGE>
                              ENTERRA CORPORATION

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

    NOTICE IS  HEREBY GIVEN  that a  special meeting  of the  stockholders  (the
"Special  Meeting") of  Enterra Corporation  ("Enterra") will  be held  at 10:00
a.m., Houston time,  on Thursday,  October 5,  1995, at  The Ritz-Carlton,  1919
Briar Oaks Lane, Houston, Texas, for the following purposes:

    1.   To consider and vote upon a proposal to approve and adopt the Agreement
       and Plan of Merger, dated  as of June 23,  1995, as amended (the  "Merger
       Agreement"), between Weatherford International Incorporated
       ("Weatherford")  and Enterra, as  well as the merger  of Enterra with and
       into  Weatherford  pursuant  thereto   (the  "Merger"),  in  which   each
       outstanding  share  of Enterra  common stock,  $1.00  par value,  will be
       converted into the  right to  receive 1.69 shares  of Weatherford  common
       stock,  $.10  par  value,  before  giving  effect  to  a  contemporaneous
       one-for-two reverse stock split of  Weatherford common stock (0.845 of  a
       share  of Weatherford  common stock  after giving  effect to  the reverse
       stock split) and all related transactions.

    2.  To consider and take action upon any other matter that may properly come
       before the Special Meeting or any adjournment thereof.

    The affirmative vote of the holders of  a majority of the shares of  Enterra
common  stock  entitled to  vote  at the  Special  Meeting is  required  for the
approval and adoption of the Merger Agreement and the Merger.

    THE BOARD OF DIRECTORS OF ENTERRA HAS APPROVED THE MERGER AGREEMENT AND  THE
PROPOSED  MERGER AND RECOMMENDS THAT ENTERRA'S  STOCKHOLDERS VOTE TO APPROVE AND
ADOPT THE MERGER AGREEMENT AND THE MERGER.

    Only stockholders of  record of  common stock at  the close  of business  on
August  24, 1995 will be entitled to notice  of the Special Meeting, and to vote
at the Special  Meeting or any  adjournment thereof. A  list of stockholders  of
Enterra  of  record as  of the  close of  business  on August  24, 1995  will be
available for inspection during normal business hours for ten days prior to  the
Special  Meeting at Enterra's executive office at 13100 Northwest Freeway, Sixth
Floor, Houston, Texas 77040.

                                           By order of the board of directors,

                                                        [LOGO]

                                                      M. GAY MATHER,
                                                        SECRETARY

August 31, 1995

YOU ARE CORDIALLY INVITED TO ATTEND THE  SPECIAL MEETING IN PERSON. EVEN IF  YOU
PLAN  TO BE PRESENT, YOU  ARE URGED TO MARK, DATE,  SIGN AND RETURN THE ENCLOSED
PROXY AT YOUR EARLIEST CONVENIENCE IN THE ENVELOPE PROVIDED SO THAT THE PRESENCE
OF A QUORUM MAY BE ASSURED. THE GIVING OF SUCH PROXY DOES NOT AFFECT YOUR  RIGHT
TO  VOTE IN PERSON IN  THE EVENT YOU ATTEND THE  SPECIAL MEETING. YOU MAY REVOKE
YOUR PROXY AT ANY TIME BEFORE IT IS VOTED.
<PAGE>

<TABLE>
<S>                                                 <C>
                      [LOGO]
            WEATHERFORD INTERNATIONAL                                     [LOGO]
                   INCORPORATED                                    ENTERRA CORPORATION
</TABLE>

                             JOINT PROXY STATEMENT
                        SPECIAL MEETINGS OF STOCKHOLDERS
                            ------------------------

                     WEATHERFORD INTERNATIONAL INCORPORATED
                                   PROSPECTUS
                                AUGUST 31, 1995

    This  Joint Proxy Statement/Prospectus is being furnished to stockholders of
Weatherford International Incorporated, a Delaware corporation  ("Weatherford"),
in connection with the solicitation of proxies by its Board of Directors for use
at  the Special Meeting of Stockholders of Weatherford (the "Weatherford Special
Meeting") scheduled to  be held  on Thursday, October  5, 1995,  at 10:30  a.m.,
Houston  time, at The Ritz-Carlton, 1919 Briar Oaks Lane, Houston, Texas, or any
adjournment thereof,  and to  stockholders of  Enterra Corporation,  a  Delaware
corporation  ("Enterra"), in connection with the  solicitation of proxies by its
Board of Directors  for use at  the Special Meeting  of Stockholders of  Enterra
(the  "Enterra Special  Meeting") scheduled to  be held on  Thursday, October 5,
1995, at 10:00 a.m.,  Houston time, at The  Ritz-Carlton, 1919 Briar Oaks  Lane,
Houston, Texas, or any adjournment thereof.

    At  the Weatherford  Special Meeting  and the  Enterra Special  Meeting, the
holders of common  stock, $.10  par value, of  Weatherford ("Weatherford  Common
Stock"),  and the holders of common stock, $1.00 par value, of Enterra ("Enterra
Common Stock"), respectively, will be asked to consider and vote upon a proposal
to approve and adopt the business combination of Enterra and Weatherford through
a merger of Enterra with and  into Weatherford (the "Merger"), with  Weatherford
being  the surviving corporation, pursuant to  the Agreement and Plan of Merger,
dated as  of  June  23,  1995,  as amended  on  August  28,  1995  (the  "Merger
Agreement"),  between Weatherford and Enterra. Such approvals are a condition to
consummating the Merger. Upon consummation of the Merger, Enterra will cease  to
exist  as a  separate corporation.  At the  effective time  of the  Merger, each
issued and outstanding share of Enterra Common Stock will be converted into  the
right  to receive 1.69 shares of  Weatherford Common Stock, before giving effect
to a one-for-two reverse stock split (the "Reverse Stock Split") of  Weatherford
Common  Stock  as of  the effective  time of  the  Merger (0.845  of a  share of
Weatherford Common Stock after  giving effect to the  Reverse Stock Split).  See
"Terms  of the  Merger". A copy  of the  Merger Agreement is  attached hereto as
Appendix A. The stockholders  of Weatherford also will  be asked to approve  and
adopt  (i) amendments to Weatherford's  Restated Certificate of Incorporation to
effect the Reverse Stock Split and to change Weatherford's name to  "Weatherford
Enterra,  Inc." (the  "Name Change"),  (ii) an  amendment to  Weatherford's 1991
Stock Option  Plan (the  "1991 Option  Plan") to  make an  additional  3,000,000
shares  of Weatherford Common  Stock (before giving effect  to the Reverse Stock
Split) available for  issuance upon the  exercise of options  granted under  the
1991  Option  Plan  and (iii)  an  amendment to  Weatherford's  Restricted Stock
Incentive Plan (the "Restricted Plan") to  make an additional 250,000 shares  of
Weatherford  Common  Stock (before  giving effect  to  the Reverse  Stock Split)
available for issuance  under the Restricted  Plan. The amendments  to the  1991
Option  Plan and the Restricted Plan are  collectively referred to in this Joint
Proxy Statement/Prospectus as the "Weatherford Plan Amendments".

    This Joint  Proxy Statement/Prospectus  also constitutes  the prospectus  of
Weatherford  pursuant to the Securities Act of 1933, as amended (the "Securities
Act"), with respect to  the issuance of up  to 24,100,000 shares of  Weatherford
Common  Stock in connection with the Merger  (after giving effect to the Reverse
Stock Split).

    This Joint Proxy Statement/Prospectus and  the accompanying proxy are  first
being mailed to stockholders of Weatherford and to stockholders of Enterra on or
about August 31, 1995.
                            ------------------------

           AN INVESTMENT IN WEATHERFORD COMMON STOCK AFTER THE MERGER
             INVOLVES CERTAIN RISKS. SEE "SPECIAL CONSIDERATIONS".

THE  SHARES OF  WEATHERFORD COMMON  STOCK TO  BE ISSUED  IN CONNECTION  WITH THE
MERGER HAVE NOT  BEEN APPROVED OR  DISAPPROVED BY THE  SECURITIES AND  EXCHANGE
 COMMISSION  OR  ANY STATE  SECURITIES COMMISSION  NOR  HAS THE  SECURITIES AND
 EXCHANGE COMMISSION  OR  ANY  STATE SECURITIES  COMMISSION  PASSED  UPON  THE
  ACCURACY   OR  ADEQUACY  OF  THIS   JOINT  PROXY  STATEMENT/PROSPECTUS.  ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

     THE DATE OF THIS JOINT PROXY STATEMENT/PROSPECTUS IS AUGUST 31, 1995.
<PAGE>
    NO PERSON  HAS  BEEN AUTHORIZED  TO  GIVE ANY  INFORMATION  OR TO  MAKE  ANY
REPRESENTATION  NOT CONTAINED IN THIS  JOINT PROXY STATEMENT/PROSPECTUS, AND, IF
GIVEN OR MADE,  SUCH INFORMATION OR  REPRESENTATION MUST NOT  BE RELIED UPON  AS
HAVING  BEEN AUTHORIZED BY  WEATHERFORD OR ENTERRA.  THIS JOINT PROXY STATEMENT/
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY THE  SECURITIES  OFFERED  BY  THIS JOINT  PROXY  STATEMENT/PROSPECTUS  OR  A
SOLICITATION  OF A PROXY IN ANY JURISDICTION WHERE, OR TO ANY PERSON WHOM, IT IS
UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION. NEITHER THE DELIVERY HEREOF  NOR
ANY  DISTRIBUTION OF SECURITIES  MADE HEREUNDER SHALL,  UNDER ANY CIRCUMSTANCES,
CREATE AN  IMPLICATION  THAT  THERE  HAS  BEEN  NO  CHANGE  IN  THE  AFFAIRS  OF
WEATHERFORD  OR ENTERRA SINCE  THE DATE HEREOF  OR THAT THE  INFORMATION IN THIS
JOINT PROXY STATEMENT/PROSPECTUS  IS CORRECT AS  OF ANY TIME  SUBSEQUENT TO  THE
DATE HEREOF.

                             AVAILABLE INFORMATION

    Weatherford and Enterra are subject to the informational requirements of the
Securities  Exchange  Act of  1934,  as amended  (the  "Exchange Act"),  and, in
accordance therewith, file reports, proxy statements and other information  with
the  Securities and Exchange Commission  (the "Commission"). Such reports, proxy
statements and  other information  filed  by Weatherford  and Enterra  with  the
Commission can be inspected at the Public Reference Section of the Commission at
Room  1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and
the regional offices of the Commission  at Northwestern Atrium Center, 500  West
Madison  Street,  Suite 1400,  Chicago, Illinois  60661,  and Seven  World Trade
Center, New York, New York 10048. They  may also be inspected at the offices  of
the  New York Stock Exchange, 22 Broad  Street, New York, New York 10006. Copies
of such  material may  be obtained  from  the Public  Reference Section  of  the
Commission  at Room 1024,  Judiciary Plaza, 450  Fifth Street, N.W., Washington,
D.C. 20549, at prescribed rates.

    Weatherford has filed with the  Commission a Registration Statement on  Form
S-4  (herein, together with all amendments  and exhibits thereto, referred to as
the "Registration  Statement") under  the  Securities Act  with respect  to  the
securities  offered hereby.  This Joint Proxy  Statement/ Prospectus constitutes
the prospectus of Weatherford  filed as part of  the Registration Statement  and
does  not contain all  the information contained  in the Registration Statement,
certain portions of which are omitted as permitted by the rules and  regulations
of  the Commission. For further information  with respect to Weatherford and the
securities offered  hereby, reference  is made  to the  Registration  Statement,
including  the  exhibits thereto,  which may  be  inspected at  the Commission's
offices, without charge, or copies of which may be obtained from the  Commission
upon  payment  of  prescribed fees.  Statements  contained in  this  Joint Proxy
Statement/Prospectus as to the contents of any contract or other document  filed
as an exhibit to the Registration Statement are not necessarily complete, and in
each  instance reference is  hereby made to  the copy of  such contract or other
document filed as an exhibit to the Registration Statement, each such  statement
being  qualified in all respects by  such reference. All information herein with
respect to Weatherford has  been furnished by  Weatherford, and all  information
herein with respect to Enterra has been furnished by Enterra.

                                       2
<PAGE>
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                    PAGE
                                                  ---------
<S>                                               <C>
AVAILABLE INFORMATION...........................          2
SUMMARY.........................................          4
  The Companies.................................          4
  The Special Meetings..........................          4
  The Merger....................................          5
  Comparative Rights of Stockholders of
   Weatherford and Enterra......................         10
  Proposal to Amend Weatherford's Certificate of
   Incorporation................................         10
  Proposal to Amend Weatherford Stock Plans.....         11
  Market Price Data.............................         11
  Summary Financial Information.................         12
  Comparative Per Share Data....................         15
SPECIAL CONSIDERATIONS..........................         16
  Special Considerations with Respect to
   Weatherford..................................         16
  Special Considerations with Respect to
   Enterra......................................         16
  Special Considerations with Respect to the
   Combined Company.............................         16
WEATHERFORD INTERNATIONAL INCORPORATED..........         18
  General.......................................         18
  Recent Developments...........................         18
ENTERRA CORPORATION.............................         18
  General.......................................         18
  Recent Developments...........................         19
GENERAL INFORMATION ABOUT THE MEETINGS..........         19
  Date, Time and Place of Special Meetings......         19
  Record Date and Outstanding Shares............         19
  Vote Required.................................         20
  Voting and Revocation of Proxies..............         21
  Solicitation of Proxies.......................         21
  Other Matters.................................         21
THE MERGER......................................         22
  General Description of the Merger.............         22
  Background....................................         22
  Joint Reasons for the Merger..................         27
  Weatherford's Reasons for the Merger..........         28
  Recommendation of the Weatherford Board of
   Directors....................................         29
  Enterra's Reasons for the Merger..............         29
  Recommendation of the Enterra Board of
   Directors....................................         30
  Opinions of Financial Advisors................         30
  Interests of Certain Persons in the Merger....         40
  Certain U.S. Federal Income Tax
   Consequences.................................         43
  Accounting Treatment..........................         44
  Governmental and Regulatory Approvals.........         44
  NYSE Listing..................................         45
  Restrictions on Resales by Affiliates.........         45
  No Dissenters' Rights.........................         45
TERMS OF THE MERGER.............................         46
  Effective Time of the Merger..................         46
  Manner and Basis of Converting Shares.........         46
  Enterra Options...............................         46
  Employee Matters..............................         47
  Stockholders Agreement........................         48
  Conditions to the Merger......................         52

<CAPTION>
                                                    PAGE
                                                  ---------
<S>                                               <C>
  Representations and Warranties of Weatherford
   and Enterra..................................         54
  Conduct of Business of Weatherford and Enterra
   Prior to Merger..............................         55
  Conduct of Business of the Combined Company
   Following Merger.............................         56
  No Solicitation...............................         57
  Payment in the Event of an Alternative
   Transaction..................................         59
  Termination or Amendment of Merger
   Agreement....................................         60
  Indemnification...............................         60
COMPARATIVE RIGHTS OF STOCKHOLDERS OF
 WEATHERFORD AND ENTERRA........................         62
  Special Vote Required for Certain
   Combinations.................................         62
  Vote Required for Extraordinary Corporate
   Transactions.................................         63
  Disposition of Assets.........................         63
  Removal of Directors..........................         63
  Stockholder Consent in Lieu of Meeting........         63
  Director Qualification and Number.............         64
  Power to Call Special Meetings of
   Stockholders.................................         64
MARKET PRICE OF COMMON STOCK....................         65
  Market Information............................         65
  Dividend Information..........................         65
WEATHERFORD AND ENTERRA COMBINED UNAUDITED PRO
 FORMA FINANCIAL INFORMATION....................         66
WEATHERFORD SELECTED FINANCIAL DATA.............         73
ENTERRA SELECTED FINANCIAL DATA.................         74
MANAGEMENT......................................         75
  Directors and Executive Officers..............         75
  Stock Ownership of Certain Beneficial Owners
   and Management...............................         77
PROPOSAL TO AMEND WEATHERFORD'S RESTATED
 CERTIFICATE OF INCORPORATION...................         82
PROPOSAL TO AMEND WEATHERFORD'S 1991 STOCK
 OPTION PLAN....................................         84
PROPOSAL TO AMEND WEATHERFORD'S RESTRICTED STOCK
 INCENTIVE PLAN.................................         87
RELATIONSHIPS WITH INDEPENDENT PUBLIC
 ACCOUNTANTS....................................         90
LEGAL MATTERS...................................         90
EXPERTS.........................................         90
STOCKHOLDERS' PROPOSALS.........................         91
INCORPORATION OF CERTAIN DOCUMENTS BY
 REFERENCE......................................         91
APPENDIX A: AGREEMENT AND PLAN OF MERGER........        A-1
APPENDIX B: OPINION OF MERRILL LYNCH & CO. .....        B-1
APPENDIX C: OPINION OF SIMMONS & COMPANY
            INTERNATIONAL, INC. ................        C-1
APPENDIX D: FIRST RESERVE STOCKHOLDERS
            AGREEMENT...........................        D-1
</TABLE>

                                       3
<PAGE>
                                    SUMMARY

    THE  FOLLOWING  CONTAINS A  BRIEF SUMMARY  OF CERTAIN  INFORMATION CONTAINED
ELSEWHERE IN  THIS  JOINT  PROXY STATEMENT/PROSPECTUS.  THIS  SUMMARY  DOES  NOT
CONTAIN A COMPLETE STATEMENT OF ALL MATERIAL INFORMATION RELATING TO THE MERGER,
THE  MERGER  AGREEMENT,  THE  REVERSE  STOCK  SPLIT,  THE  NAME  CHANGE  AND THE
WEATHERFORD PLAN AMENDMENTS  AND IS  SUBJECT AND  QUALIFIED IN  ITS ENTIRETY  BY
REFERENCE  TO THE MORE  DETAILED INFORMATION AND  FINANCIAL STATEMENTS CONTAINED
ELSEWHERE OR INCORPORATED BY REFERENCE IN THIS JOINT PROXY STATEMENT/PROSPECTUS,
THE MERGER  AGREEMENT,  WHICH IS  ATTACHED  HERETO AND  INCORPORATED  HEREIN  BY
REFERENCE,  AND THE OTHER APPENDICES  ATTACHED HERETO. CERTAIN CAPITALIZED TERMS
USED  IN   THIS   SUMMARY   ARE   DEFINED  ELSEWHERE   IN   THIS   JOINT   PROXY
STATEMENT/PROSPECTUS.  UNLESS  OTHERWISE INDICATED,  HISTORICAL  INFORMATION FOR
WEATHERFORD INCLUDED IN THIS JOINT  PROXY STATEMENT/PROSPECTUS DOES NOT  REFLECT
THE REVERSE STOCK SPLIT.

THE COMPANIES

    WEATHERFORD  INTERNATIONAL  INCORPORATED.    Weatherford  is  a  diversified
international energy service and manufacturing  company that provides a  variety
of  services and equipment to the  oil and gas industry. Weatherford's principal
businesses consist of providing  tubular handling services, renting  specialized
oilfield  equipment  and  providing  fishing  services  and  related  tools, and
manufacturing and selling cementation products and other equipment.  Weatherford
operates in virtually every oil and gas exploration and production region in the
world.  The principal executive offices of  Weatherford are located at 1360 Post
Oak Boulevard, Suite  1000, Houston, Texas  77056, and its  telephone number  at
that address is (713) 439-9400.

    ENTERRA  CORPORATION.    Enterra  is  a  worldwide  provider  of specialized
services and products to the oil and gas industry through its oilfield, pipeline
and compression services and  equipment businesses. Enterra's oilfield  services
and  equipment business consists  primarily of the rental  and sale of equipment
used  in  oil  and  gas  well  drilling,  completion,  production  and  workover
activities  and the provision  of well control  assistance and fishing services.
The pipeline services and equipment business consists of the rental and sale  of
specialized  equipment used  in construction  or rehabilitation  of oil  and gas
pipelines. The  compression  services and  equipment  business consists  of  the
rental  and  sale  of gas  compressor  systems  for use  in  the  production and
transportation of  natural gas.  Enterra  regularly reviews  potential  business
acquisitions  in its  core businesses  and is  currently pursuing  a substantial
acquisition in its gas compression business. The principal executive offices  of
Enterra  are located  at 13100  Northwest Freeway,  Sixth Floor,  Houston, Texas
77040, and its telephone number at that address is (713) 462-7300.

    As  used  herein,   unless  the   context  otherwise   requires,  the   term
"Weatherford"   refers  to   Weatherford  International   Incorporated  and  its
subsidiaries, and  the term  "Enterra"  refers to  Enterra Corporation  and  its
subsidiaries.

THE SPECIAL MEETINGS

    TIME, DATE, PLACE AND PURPOSE.  The Weatherford Special Meeting will be held
at  10:30 a.m., Houston time, on Thursday, October 5, 1995, at The Ritz-Carlton,
1919 Briar Oaks Lane, Houston, Texas, for the purpose of approving and  adopting
the  Merger, the Merger Agreement, the Reverse  Stock Split, the Name Change and
the Weatherford Plan Amendments, as required under Delaware law, the 1991 Option
Plan, the Restricted Plan and Weatherford's listing agreement with the New  York
Stock Exchange ("NYSE"), as applicable. The Enterra Special Meeting will be held
at  10:00 a.m., Houston time, on Thursday, October 5, 1995, at The Ritz-Carlton,
1919 Briar Oaks Lane, Houston, Texas, for the purpose of approving and  adopting
the  Merger  and  the  Merger  Agreement, as  required  under  Delaware  law and
Enterra's listing agreement with the NYSE.

    RECORD DATE,  VOTE REQUIRED  AND STOCKHOLDER  AGREEMENTS.   Only holders  of
record of Weatherford Common Stock and holders of record of Enterra Common Stock
at  the close of business on August 24, 1995 (the "Record Date") are entitled to
notice of,  and to  vote at,  the Weatherford  Special Meeting  and the  Enterra
Special Meeting, respectively.

                                       4
<PAGE>
    Under  Delaware  law, approval  and adoption  of the  Merger and  the Merger
Agreement require  the affirmative  vote of  the holders  of a  majority of  the
shares  of Weatherford Common Stock and the  holders of a majority of the shares
of Enterra Common  Stock issued and  outstanding and entitled  to vote  thereon.
Pursuant  to the rules of the NYSE, approval  and adoption of the Merger and the
Merger Agreement require the  affirmative vote of the  holders of a majority  of
the  shares of Weatherford Common  Stock present or represented  by proxy at the
Weatherford Special  Meeting,  so  long  as  the  total  number  of  votes  cast
represents  a majority  of the  shares entitled  to vote  on such  matter. Under
Delaware law,  under the  1991 Option  Plan and  under the  Restricted Plan,  as
applicable,  approval and adoption  of the Reverse Stock  Split, the Name Change
and the Weatherford  Plan Amendments each  require the affirmative  vote of  the
holders  of a  majority of  the shares  of Weatherford  Common Stock  present in
person or represented by proxy and  entitled to vote thereon at the  Weatherford
Special  Meeting. None  of the Merger,  the Merger Agreement,  the Reverse Stock
Split and the Name Change will be effected unless all such matters are  approved
and  adopted by the  stockholders of Weatherford  and the Merger  and the Merger
Agreement are approved and adopted by the stockholders of Enterra. The amendment
to the 1991  Option Plan  will not  be effected  unless the  Merger, the  Merger
Agreement,  the Reverse Stock Split and the Name Change are approved and adopted
by the stockholders of Weatherford and  the Merger and the Merger Agreement  are
approved  and  adopted by  the  stockholders of  Enterra.  The amendment  to the
Restricted Plan  will  be  effected  regardless of  whether  any  of  the  other
proposals  are  approved and  adopted by  the  stockholders of  Weatherford. The
Merger, the Merger Agreement, the Reverse  Stock Split and the Name Change  will
be  effected regardless of whether either or  both of the amendments to the 1991
Option Plan and the Restricted Plan are approved and adopted by the stockholders
of Weatherford.

    At the close of business on the Record Date, there were 54,354,258 shares of
Weatherford Common Stock  outstanding and  entitled to vote  at the  Weatherford
Special  Meeting, of which  the directors and officers  of Weatherford and their
affiliates  held  1,684,573  shares,  representing  approximately  3.1%  of  the
outstanding  shares. Such persons have indicated to Weatherford that they intend
to vote their shares in  favor of the approval and  adoption of the Merger,  the
Merger  Agreement, the Reverse Stock Split,  the Name Change and the Weatherford
Plan Amendments.

    At the close of business on the Record Date, there were 27,822,950 shares of
Enterra Common Stock  outstanding and entitled  to vote at  the Enterra  Special
Meeting. First Reserve and the First Reserve Funds (each as hereinafter defined)
have  entered into an agreement  (the "Stockholders Agreement") with Weatherford
pursuant to which  they have  agreed to vote  the 11,212,349  shares of  Enterra
Common  Stock over  which they  have voting  control, representing approximately
40.3% of  the  outstanding  shares, in  favor  of  the adoption  of  the  Merger
Agreement  unless the  Enterra Board  of Directors, at  the time  of the Enterra
Special Meeting, is recommending that the Enterra stockholders vote against  the
adoption  of the Merger Agreement in view of the pendency of an Enterra Superior
Proposal (as defined in "Terms  of the Merger --  No Solicitation"). If, at  the
time  of  the  Enterra  Special  Meeting,  the  Enterra  Board  of  Directors is
recommending that  the Enterra  stockholders vote  against the  adoption of  the
Merger  Agreement, First  Reserve and the  First Reserve Funds  have agreed with
Enterra that they will vote the foregoing shares against such adoption. See "The
Merger -- Interests of Certain Persons in the Merger".  At the close of business
on the Record Date, the directors and officers of Enterra and their  affiliates,
excluding the First Reserve Group (as hereinafter defined), held 109,332 shares,
representing  approximately 0.4% of the outstanding shares and have indicated to
Enterra that they  intend to  vote their  shares in  favor of  the approval  and
adoption of the Merger and the Merger Agreement.

THE MERGER

    TERMS  OF THE MERGER.   At the Effective Time  (as hereinafter defined), the
businesses of Enterra and Weatherford will  be combined pursuant to a merger  of
Enterra  with  and into  Weatherford,  with Weatherford  becoming  the surviving
corporation (the "Surviving  Corporation"). At the  Effective Time,  Weatherford
will change its name to "Weatherford Enterra, Inc." Pursuant to the Merger, each

                                       5
<PAGE>
outstanding  share of Enterra Common  Stock will be converted  into the right to
receive 1.69 shares  of Weatherford Common  Stock, before giving  effect to  the
Reverse  Stock Split (0.845 of a share  of Weatherford Common Stock after giving
effect to the Reverse Stock Split).

    Based upon the  number of  shares of  Weatherford Common  Stock and  Enterra
Common  Stock outstanding  as of  the Record  Date and  taking into  account the
Reverse Stock  Split (not  including  any Weatherford  or Enterra  stock  option
shares),  approximately 50,688,000  shares of  Weatherford Common  Stock will be
outstanding immediately  following the  Effective Time,  of which  approximately
23,510,000  shares, representing approximately 46.4% of  the total, will be held
by former holders of Enterra Common Stock.

    RECOMMENDATIONS OF  THE  BOARDS OF  DIRECTORS.   THE  WEATHERFORD  BOARD  OF
DIRECTORS  BELIEVES THAT THE  TERMS OF THE MERGER  ARE FAIR TO,  AND IN THE BEST
INTERESTS OF,  WEATHERFORD  AND THE  HOLDERS  OF WEATHERFORD  COMMON  STOCK  AND
RECOMMENDS  THAT THE HOLDERS  OF WEATHERFORD COMMON STOCK  APPROVE AND ADOPT THE
MERGER AND  THE MERGER  AGREEMENT. See  "The Merger  -- Background",  "--  Joint
Reasons  for  the Merger",  "-- Weatherford's  Reasons for  the Merger"  and "--
Recommendation of the Weatherford Board of Directors".

    THE ENTERRA BOARD  OF DIRECTORS BELIEVES  THAT THE TERMS  OF THE MERGER  ARE
FAIR TO, AND IN THE BEST INTERESTS OF, ENTERRA AND THE HOLDERS OF ENTERRA COMMON
STOCK  AND RECOMMENDS THAT THE HOLDERS OF ENTERRA COMMON STOCK APPROVE AND ADOPT
THE MERGER AND THE MERGER AGREEMENT.  See "The Merger -- Background", "--  Joint
Reasons   for  the   Merger",  "--  Enterra's   Reasons  for   the  Merger"  and
"-- Recommendation of the Enterra Board of Directors".

    OPINIONS OF  FINANCIAL ADVISORS.   The  Weatherford Board  of Directors  has
received  a written opinion  from Merrill Lynch  & Co. ("Merrill  Lynch") to the
effect that, as of the date of such  opinion, the conversion rate to be used  in
the  Merger is fair to the holders  of Weatherford Common Stock from a financial
point of view, and the Enterra Board of Directors has received a written opinion
from Simmons & Company International, Inc. ("Simmons") to the effect that, as of
the date of such  opinion, the consideration  to be received  by the holders  of
Enterra  Common Stock in  the Merger is fair  from a financial  point of view to
such holders.

    In  connection  with  Merrill  Lynch's  services  as  financial  advisor  to
Weatherford, Weatherford has agreed to pay Merrill Lynch as compensation for its
services  a fee in the amount of $2 million upon consummation of the Merger (or,
if the Merger  is not  consummated, upon  the consummation  of another  business
combination  within  18  months  following the  retention  of  Merrill  Lynch as
Weatherford's  financial  advisor).  Weatherford   has  paid  Merrill  Lynch   a
noncontingent  fee of  $100,000 that will  be credited  against such transaction
fee. Weatherford  also  has  agreed  to  reimburse  Merrill  Lynch  for  certain
reasonable  out-of-pocket expenses incurred in connection with the Merger and to
indemnify Merrill  Lynch  (and  its employees  and  directors)  against  certain
liabilities  and  expenses  in  connection with  the  Merger,  including certain
liabilities under the Federal securities laws.

    Enterra has agreed to pay Simmons  contingent fees totaling $2 million  upon
consummation  of the  Merger. Enterra  has paid  Simmons a  noncontingent fee of
$200,000 that will  be credited  against such contingent  fees. Weatherford  has
agreed  to reimburse Enterra for half of  the noncontingent fee if the Merger is
not consummated.  Enterra  also has  agreed  to reimburse  Simmons  for  certain
expenses incurred in connection with its engagement and to indemnify Simmons and
certain  related persons against certain liabilities and expenses relating to or
arising out of its engagement,  including certain liabilities under the  Federal
securities laws.

    The full text of the Merrill Lynch and Simmons opinions are attached to this
Joint  Proxy Statement/Prospectus as Appendices B  and C, respectively. See "The
Merger -- Opinions of Financial Advisors".

    On  the  date  of  this  Joint  Proxy  Statement/Prospectus,  Merrill  Lynch
confirmed  to Weatherford in writing that as of such date the conversion rate to
be used in the Merger is fair to the holders of

                                       6
<PAGE>
Weatherford Common Stock from a financial point of view, and Simmons  reaffirmed
to  Enterra in writing that as of such  date the consideration to be received by
the holders of Enterra Common Stock in the Merger is fair from a financial point
of view to such holders.

    CERTAIN U.S. FEDERAL INCOME TAX CONSEQUENCES.  Weatherford and Enterra  have
each  received an opinion of  its counsel to the effect  that the Merger will be
treated for U.S.  Federal income  tax purposes  as a  reorganization within  the
meaning  of Section 368(a) of the Internal Revenue Code of 1986, as amended (the
"Code"), and  that  Weatherford  and  Enterra  will  each  be  a  party  to  the
reorganization  within the meaning  of Section 368(b) of  the Code. In addition,
Weatherford has received an opinion of its counsel that no gain or loss will  be
recognized  by Weatherford or Enterra as a result of the Merger, and Enterra has
received an opinion of its  counsel that no gain or  loss will be recognized  by
stockholders  of Enterra  as a  result of  the Merger,  except for  gain or loss
attributable to  cash received  by Enterra  stockholders in  lieu of  fractional
shares. See "The Merger -- Certain U.S. Federal Income Tax Consequences".

    ACCOUNTING  TREATMENT.    Weatherford  and  Enterra  have  been  advised  by
Weatherford's independent public accountants that Weatherford is eligible to  be
a  party to a merger accounted for as  a "pooling of interests" and they are not
aware of any matters that prohibit the use of "pooling of interests"  accounting
in  connection with  the Merger.  Weatherford and  Enterra have  been advised by
Enterra's independent public  accountants that  no conditions  exist that  would
preclude  Weatherford's accounting for the Merger as a "pooling of interests" as
those conditions relate to Enterra. See "The Merger -- Accounting Treatment".

    GOVERNMENTAL AND REGULATORY APPROVALS.  On  June 30, 1995 and July 3,  1995,
Weatherford  and  Enterra, respectively,  filed  notification reports  under the
Hart-Scott-Rodino Antitrust Improvements Act, as  amended (the "HSR Act"),  with
the  Federal Trade  Commission (the  "FTC"), and  on June  30, 1995,  they filed
notification reports with the  Antitrust Division of  the Department of  Justice
(the  "Department of  Justice"). The required  waiting period under  the HSR Act
expired on  August 2,  1995.  See "The  Merger  -- Governmental  and  Regulatory
Approvals".  Weatherford and Enterra are aware of no other material governmental
or regulatory approvals required for the consummation of the Merger, other  than
compliance with applicable securities laws of the various states.

    EFFECTIVE  TIME OF  THE MERGER.   The  Merger will  become effective  at the
effective time set  forth in  the certified copy  of the  Certificate of  Merger
issued  by the Secretary of  State of the State of  Delaware with respect to the
Merger (the "Effective Time"). Assuming  all conditions to the Merger  contained
in the Merger Agreement are satisfied or waived prior thereto, it is anticipated
that  the  Effective  Time  will  occur as  soon  as  practicable  following the
Weatherford Special Meeting and the Enterra  Special Meeting. See "Terms of  the
Merger -- Effective Time of the Merger".

    EXCHANGE  OF ENTERRA STOCK  CERTIFICATES.  As soon  as practicable after the
Effective Time, American Stock Transfer  & Trust Company (the "Exchange  Agent")
will mail a letter of transmittal and other information to each holder of record
of  Enterra  Common  Stock immediately  before  the  Effective Time  for  use in
exchanging certificates formerly representing shares of Enterra Common Stock for
certificates representing shares of Weatherford Common Stock and cash in lieu of
any fractional shares. SHARE CERTIFICATES SHOULD NOT BE SURRENDERED FOR EXCHANGE
BY STOCKHOLDERS OF ENTERRA PRIOR TO THE  APPROVAL OF THE MERGER AND THE  RECEIPT
OF  A LETTER  OF TRANSMITTAL. See  "Terms of the  Merger -- Manner  and Basis of
Converting Shares".

    ASSUMPTION OF ENTERRA OPTIONS.   Immediately after the Effective Time,  each
Enterra  Option (as hereinafter defined) that remains unexercised in whole or in
part will  be  replaced  by  a  substitute  option  granted  under  an  existing
Weatherford  stock option plan or separate stock option agreement. The number of
shares of Weatherford Common Stock purchasable under any replaced Enterra Option
will be equal to the  number of shares of Enterra  Common Stock subject to  such
Enterra Option multiplied by the conversion rate to be used in the Merger (after
giving  effect to the Reverse Stock Split),  and the per share option price will
be equal to the  per share option  price of the Enterra  Option divided by  such
conversion rate. See "Terms of the Merger -- Enterra Options".

                                       7
<PAGE>
    EMPLOYEE  MATTERS.  Pursuant to the Merger Agreement, (i) Weatherford agreed
to certain  matters with  regard to  Enterra employees  currently covered  under
Enterra employee benefit plans, (ii) Weatherford and Enterra agreed to establish
substantially  similar special severance  pay plans for a  limited number of key
employees, (iii) Weatherford and Enterra agreed to the procedure for determining
1995 bonuses  to Enterra  employees  and additional  bonuses  not to  exceed  $1
million  in the aggregate to Enterra employees, (iv) Weatherford agreed to enter
into change of  control agreements  with two  Enterra officers  who will  become
Surviving Corporation officers and indemnification agreements with seven Enterra
officers  or  directors  who  will  become  Surviving  Corporation  officers  or
directors, (v) Enterra agreed  to negotiate an amendment  to each of the  eleven
existing  severance  agreements  between  Enterra  and  certain  of  its  senior
officers, (vi) Weatherford  agreed to negotiate  an amendment to  twelve of  the
existing  change of  control agreements between  Weatherford and  certain of its
employees, (vii) Weatherford agreed to  enter into certain arrangements with  D.
Dale  Wood,  Chairman of  the Board,  President and  Chief Executive  Officer of
Enterra, and (viii) Weatherford  agreed to pay an  amount to Philip  Burguieres,
Chairman of the Board, President and Chief Executive Officer of Weatherford. See
"The  Merger -- Interests  of Certain Persons  in the Merger"  and "Terms of the
Merger -- Employee Matters".

    STOCKHOLDERS AGREEMENT.   Approximately 40.3% of  the outstanding shares  of
Enterra  Common Stock  are owned by  seven investment funds  (the "First Reserve
Funds") managed  by  First  Reserve Corporation  ("First  Reserve").  The  First
Reserve Funds will own approximately 18.7% of the Weatherford Common Stock to be
outstanding  after the Merger.  In conjunction with the  execution of the Merger
Agreement, Weatherford entered into the  Stockholders Agreement relating to  all
Weatherford  securities that  will be beneficially  owned by  First Reserve, the
First Reserve  Funds and  their affiliates  (the "First  Reserve Group"),  which
agreement  is  on substantially  the same  terms  as the  stockholders agreement
currently in effect among  Enterra, First Reserve and  the First Reserve  Funds.
The  Stockholders Agreement is for  a term commencing at  the Effective Time and
continuing until August 12,  2004, subject to  suspension of certain  provisions
set  forth therein during periods when the First Reserve Group beneficially owns
less than 10% of the Combined Voting  Power (as hereinafter defined). A copy  of
the  Stockholders Agreement is attached to this Joint Proxy Statement/Prospectus
as Appendix D. See "Terms of the Merger -- Stockholders Agreement".

    OTHER CONDITIONS TO THE MERGER.  In addition to the approval and adoption of
the Merger and the  Merger Agreement by the  requisite votes of Weatherford  and
Enterra  stockholders, the respective obligations  of Weatherford and Enterra to
effect the Merger are subject to the satisfaction or waiver, where  permissible,
of  certain other conditions, including (i) confirmation of the tax opinions and
accountants' advice described above, (ii) the  receipt by each party of  various
legal  opinions, certificates and consents and  (iii) the fact that the opinions
of the  financial  advisors shall  not  have been  withdrawn.  There can  be  no
assurance  that all of the conditions set  forth in the Merger Agreement will be
satisfied. See "Terms of the Merger -- Conditions to the Merger".

    MANAGEMENT AFTER THE MERGER.   The Surviving Corporation Board of  Directors
will  initially consist  of five  designees chosen  by the  Weatherford Board of
Directors and  five designees  chosen by  the Enterra  Board of  Directors.  The
officers of the Surviving Corporation are expected to consist of the officers of
Weatherford  immediately prior  to the Effective  Time and M.  Timothy Carey and
Steven C. Grant, both of whom are officers of Enterra. D. Dale Wood, Chairman of
the Board, President and Chief Executive  Officer of Enterra, will not  continue
as  an officer or director  of the Surviving Corporation,  but will enter into a
five-year consulting  agreement  with Weatherford  at  the Effective  Time.  See
"Terms  of the Merger --  Conduct of Business of  the Combined Company Following
Merger", "Terms of the Merger -- Employee Matters" and "Management --  Directors
and Executive Officers".

    NO  SOLICITATION.  The  Merger Agreement provides that  each party will not,
and will not permit any  of its subsidiaries to, or  authorize or permit any  of
its  or their officers,  directors, employees, investment  bankers, attorneys or
other advisors,  agents  or  representatives to,  directly  or  indirectly,  (a)
solicit, initiate, encourage the submission of, or enter into any agreement with
respect to, any

                                       8
<PAGE>
proposal  or offer  from any person  (other than the  other party or  any of its
affiliates) for  a  merger  or  other business  combination,  acquisition  of  a
material amount of its assets or acquisition of more than 30% of its outstanding
voting  stock, or (b) participate in  any discussions or negotiations regarding,
or furnish to  any person any  information with  respect to, the  making of  any
proposal  that constitutes, or may  reasonably be expected to  lead to, any such
transaction.  Notwithstanding  the   foregoing,  prior  to   the  vote  of   the
stockholders  for approval and adoption of  the Merger Agreement and the Merger,
either party may  participate in  discussions or negotiations  with, or  furnish
information to, a third party to the extent that such party's Board of Directors
determines,  in good faith after consultation with outside counsel, that failure
to take such actions could reasonably be expected to result in a breach of  such
Board's  fiduciary  obligations.  Either party  may  subsequently  terminate the
Merger Agreement if its Board of Directors withdraws or modifies its approval or
recommendation of the Merger Agreement or the Merger due to a superior  proposal
to  the Merger; provided that  such party may so  terminate the Merger Agreement
only if its stockholders have  not yet voted upon the  Merger and if such  party
shall  have  paid the  other  party $20  million.  The party  not  receiving the
superior proposal also may terminate the  Merger Agreement if the other  party's
Board  of Directors withdraws or modifies  its approval or recommendation of the
Merger Agreement or the Merger or approves or recommends a takeover proposal. In
addition, each party  is permitted to  take and disclose  to its stockholders  a
position  contemplated by Rule 14e-2(a) of  the Exchange Act, relating to tender
offers, provided  such party  does  not withdraw  or  modify its  position  with
respect  to  the Merger  or take  any action  having such  effect or  approve or
recommend a takeover  proposal. In  addition, pursuant to  an agreement  entered
into with Weatherford, First Reserve and the First Reserve Funds have agreed not
to  directly or indirectly (i) solicit, initiate or encourage the submission of,
or enter into  any agreement with  respect to, an  Enterra takeover proposal  or
(ii)  participate in  any discussion  or negotiation  regarding, or  furnish any
person any  information  with  respect  to, the  making  of  any  proposal  that
constitutes,  or  may reasonably  be expected  to lead  to, an  Enterra takeover
proposal. See "Terms of the Merger -- No Solicitation".

    PAYMENT IN  THE EVENT  OF AN  ALTERNATIVE TRANSACTION.   Each  party to  the
Merger  Agreement  agreed to  pay  the other  party  $20 million  in immediately
available funds promptly upon the termination  of the Merger Agreement if it  is
terminated  (i) due to  the existence of  a superior takeover  proposal for such
party, (ii) for any reason other than a material breach by the other party and a
takeover proposal for such  party shall have been  made and the stockholders  of
such party shall not have approved the Merger or (iii) for failure of such party
to receive, or the withdrawal of, a favorable opinion from its investment banker
or  because of a material adverse change in the business, financial condition or
results of operations of the other party and its subsidiaries, taken as a  whole
(except for certain exclusions previously agreed to by Weatherford and Enterra),
or  the breach  by the  other party of  any of  its representations, warranties,
covenants, agreements or  obligations contained  in the  Merger Agreement,  and,
within  six months after such termination, such  party shall have entered into a
definitive agreement with any person (other than  the other party or any of  its
affiliates)  with respect  to a  superior takeover  proposal. See  "Terms of the
Merger -- Payment in the Event of an Alternative Transaction".

    TERMINATION OR AMENDMENT OF MERGER AGREEMENT.   The Merger Agreement may  be
terminated,  among other circumstances, (a) by mutual consent of Weatherford and
Enterra; (b) by either party if the Merger is not effected on or before December
31, 1995; or (c)  by either party  if, since the date  of the Merger  Agreement,
there has been a material adverse change in the business, financial condition or
results  of operations of the other party and its subsidiaries, taken as a whole
(except for certain exclusions previously agreed to by Weatherford and Enterra),
or a  material  breach by  the  other  party of  any  representation,  warranty,
covenant,  agreement or obligation set forth in the Merger Agreement. The Merger
Agreement may be amended or supplemented  by an instrument in writing signed  on
behalf of each party, provided that after the Merger Agreement has been approved
and  adopted by the stockholders  of Weatherford and Enterra,  it may be amended
only as may  be permitted  under applicable  law. See  "Terms of  the Merger  --
Termination or Amendment of Merger Agreement".

                                       9
<PAGE>
    INDEMNIFICATION.    The  Merger  Agreement provides  that  the  officers and
directors of Enterra will  be indemnified against all  liabilities and costs  in
connection  with claims based  on or arising  out of the  fact that such persons
were officers or directors, whether or not pertaining to any matter existing  or
occurring at or prior to the Effective Time, as well as those arising out of, or
pertaining to, the Merger Agreement, the Merger or the transactions contemplated
thereby.  See "Enterra  Corporation --  Recent Developments"  and "Terms  of the
Merger -- Indemnification".

    NO DISSENTERS' RIGHTS.  Delaware law does not provide holders of Weatherford
Common Stock or  Enterra Common  Stock who  object to  the Merger  and who  vote
against  or abstain from voting in favor  of the Merger and the Merger Agreement
with any appraisal  rights or  the right  to receive  cash for  their shares  of
Weatherford   Common  Stock  or  Enterra  Common  Stock,  respectively.  Neither
Weatherford nor  Enterra  intends to  make  available  any such  rights  to  its
stockholders.

COMPARATIVE RIGHTS OF STOCKHOLDERS OF WEATHERFORD AND ENTERRA

    The  rights of  holders of  Enterra Common  Stock are  currently governed by
Delaware law,  Enterra's Restated  Certificate  of Incorporation  and  Enterra's
By-laws,  as amended. Upon consummation of the Merger, holders of Enterra Common
Stock will  become holders  of Weatherford  Common Stock,  and their  rights  as
holders  of Weatherford Common Stock will still be governed by Delaware law, but
will then be governed by Weatherford's Restated Certificate of Incorporation and
Weatherford's By-laws, as  amended. There  are various  differences between  the
rights  of  Enterra stockholders  and  the rights  of  Weatherford stockholders,
including, among others, the required vote for certain business combinations and
other significant matters.  Furthermore, Weatherford's  Restated Certificate  of
Incorporation  contains certain provisions that may have the effect of deterring
or making it more difficult for a third party to acquire control of Weatherford.
See "Comparative Rights of Stockholders of Weatherford and Enterra".

PROPOSAL TO AMEND WEATHERFORD'S CERTIFICATE OF INCORPORATION

    At the Effective Time, the amendments to Weatherford's Restated  Certificate
of  Incorporation regarding the Reverse Stock Split  and the Name Change will be
effected. Pursuant to the  Reverse Stock Split, each  two shares of  Weatherford
Common  Stock held at the Effective Time will be converted into one share of new
Weatherford Common Stock. As soon as  practicable after the Effective Time,  the
Exchange  Agent will mail a letter of  transmittal and other information to each
holder of record of  Weatherford Common Stock  immediately before the  Effective
Time  for  use in  exchanging  certificates representing  shares  of Weatherford
Common Stock  for certificates  representing shares  of new  Weatherford  Common
Stock  and cash in lieu  of fractional shares. SHARE  CERTIFICATES SHOULD NOT BE
SURRENDERED FOR EXCHANGE BY STOCKHOLDERS OF WEATHERFORD PRIOR TO APPROVAL OF THE
REVERSE STOCK SPLIT AND THE RECEIPT OF A LETTER OF TRANSMITTAL. Pursuant to  the
Name  Change,  Weatherford's  name will  be  changed  at the  Effective  Time to
"Weatherford Enterra, Inc." THE WEATHERFORD BOARD OF DIRECTORS BELIEVES THAT THE
REVERSE STOCK  SPLIT WOULD  BE  ADVANTAGEOUS TO  THE SURVIVING  CORPORATION  AND
RECOMMENDS  THAT THE HOLDERS  OF WEATHERFORD COMMON STOCK  APPROVE AND ADOPT THE
REVERSE STOCK SPLIT AND  THE NAME CHANGE. See  "Proposal to Amend  Weatherford's
Restated Certificate of Incorporation".

    None  of the Merger, the  Merger Agreement, the Reverse  Stock Split and the
Name Change will be effected unless all such matters are approved and adopted by
the stockholders of  Weatherford and  the Merger  and the  Merger Agreement  are
approved  and adopted by the stockholders of  Enterra. The amendment to the 1991
Option Plan will not  be effected unless the  Merger, the Merger Agreement,  the
Reverse  Stock  Split  and the  Name  Change  are approved  and  adopted  by the
stockholders of Weatherford and the Merger and the Merger Agreement are approved
and adopted by the stockholders of Enterra. The amendment to the Restricted Plan
will be effected regardless of whether  any of the other proposals are  approved
and  adopted  by  the  stockholders  of  Weatherford.  The  Merger,  the  Merger
Agreement, the  Reverse  Stock  Split  and the  Name  Change  will  be  effected
regardless  of whether either or both of  the amendments to the 1991 Option Plan
and the  Restricted  Plan  are  approved and  adopted  by  the  stockholders  of
Weatherford.

                                       10
<PAGE>
PROPOSAL TO AMEND WEATHERFORD STOCK PLANS
    At the Effective Time, the Weatherford Plan Amendments will be effected. The
Weatherford   Plan  Amendments  will  ensure  there  are  sufficient  shares  of
Weatherford Common Stock  available to  Weatherford to  satisfy (i)  unexercised
Enterra Options that are replaced by substitute options and future option grants
under the 1991 Option Plan and (ii) future grants under the Restricted Plan. THE
WEATHERFORD BOARD OF DIRECTORS BELIEVES THAT THE WEATHERFORD PLAN AMENDMENTS ARE
ESSENTIAL  TO  THE  MERGER AND  TO  SATISFY  FUTURE NEEDS  FOR  PLAN  AWARDS AND
RECOMMENDS THAT THE HOLDERS  OF WEATHERFORD COMMON STOCK  APPROVE AND ADOPT  THE
WEATHERFORD  PLAN AMENDMENTS.  See "Proposal  to Amend  Weatherford's 1991 Stock
Option Plan" and  "Proposal to  Amend Weatherford's  Restricted Stock  Incentive
Plan".

    The  amendment  to the  1991 Option  Plan  will not  be effected  unless the
Merger, the Merger Agreement,  the Reverse Stock Split  and the Name Change  are
approved  and adopted by the stockholders of  Weatherford and the Merger and the
Merger Agreement are approved  and adopted by the  stockholders of Enterra.  The
amendment  to the Restricted Plan will be  effected regardless of whether any of
the other proposals are approved and adopted by the stockholders of Weatherford.
The Merger, the Merger  Agreement, the Reverse Stock  Split and the Name  Change
will  be effected regardless of whether either  or both of the amendments to the
1991 Option  Plan  and the  Restricted  Plan are  approved  and adopted  by  the
stockholders of Weatherford.

MARKET PRICE DATA
    The  Weatherford Common Stock and the Enterra Common Stock are traded on the
NYSE under the symbols "WII" and "EN", respectively. Prior to October 19,  1994,
the Weatherford Common Stock was traded on the American Stock Exchange, Inc. The
following table sets forth the range of high and low closing sale prices for the
Weatherford Common Stock and the Enterra Common Stock for the periods indicated,
as  reported on the NYSE (or, in the  case of Weatherford, on the American Stock
Exchange for periods prior to October 19, 1994).

<TABLE>
<CAPTION>
                                                          WEATHERFORD             ENTERRA
                                                      --------------------  --------------------
                                                        HIGH        LOW       HIGH        LOW
                                                      ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>
1993
  First Quarter.....................................  $    9.50  $    4.75  $   22.25  $   17.00
  Second Quarter....................................      13.75       8.75      29.00      20.25
  Third Quarter.....................................      12.88       9.25      26.38      21.00
  Fourth Quarter....................................      13.38       8.50      25.25      17.75
1994
  First Quarter.....................................      11.13       8.13      21.88      18.50
  Second Quarter....................................      14.75       8.00      23.75      18.25
  Third Quarter.....................................      14.00      11.63      23.88      20.00
  Fourth Quarter....................................      12.75       8.25      23.13      18.25
1995
  First Quarter.....................................      10.50       8.50      18.75      15.25
  Second Quarter....................................      12.75       9.75      21.00      16.00
  Third Quarter (through August 28, 1995)...........      13.88      11.88      22.63      19.88
</TABLE>

    On June  23,  1995,  the last  trading  day  prior to  the  announcement  by
Weatherford  and  Enterra  that they  had  reached an  agreement  concerning the
Merger, the  closing sale  prices of  Weatherford Common  Stock and  of  Enterra
Common  Stock  as  reported  by  the NYSE  were  $11.50  and  $20.88  per share,
respectively.

    On August 28, 1995, the closing sale prices of Weatherford Common Stock  and
of  Enterra Common  Stock as  reported by  the NYSE  were $12.63  and $21.13 per
share, respectively.

    Following the Merger, Weatherford Common Stock will continue to be traded on
the NYSE under the symbol "WII". Following the Merger, Enterra Common Stock will
cease to be traded  on the NYSE, and  there will be no  further market for  such
stock.

                                       11
<PAGE>
SUMMARY FINANCIAL INFORMATION

    The  following  historical consolidated  financial  data of  Weatherford and
Enterra  have  been  derived  from  their  respective  historical   consolidated
financial  statements and should  be read in  conjunction with such consolidated
financial statements and notes thereto,  which are incorporated by reference  in
this  Joint Proxy Statement/Prospectus. See  "Incorporation of Certain Documents
by Reference". The unaudited pro forma financial data of Weatherford and Enterra
combined have been  derived from  the unaudited pro  forma financial  statements
using  the "pooling of  interests" method of accounting  (after giving effect to
the Reverse Stock Split) and should  be read in conjunction with such  unaudited
pro  forma financial statements and notes  thereto, which are included elsewhere
in this  Joint Proxy  Statement/Prospectus.  For a  description of  the  various
periods  combined for pro forma purposes and for other information regarding pro
forma data, see "Weatherford and Enterra Combined Unaudited Pro Forma  Financial
Information".

                                  WEATHERFORD
                  (AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)

HISTORICAL CONSOLIDATED STATEMENTS OF INCOME DATA:

<TABLE>
<CAPTION>
                                                      SIX MONTHS ENDED
                                                          JUNE 30,                 YEAR ENDED DECEMBER 31,
                                                  ------------------------  -------------------------------------
                                                     1995         1994         1994         1993         1992
                                                  -----------  -----------  -----------  -----------  -----------
                                                        (UNAUDITED)
<S>                                               <C>          <C>          <C>          <C>          <C>
Revenues........................................  $   199,087  $   180,397  $   372,314  $   333,083  $   222,964
Depreciation and amortization...................       21,831       16,712       36,429       28,607       17,880
Operating income................................       27,699       24,410       45,003       33,330       19,726
Net income......................................       18,382       16,903       29,460       21,990       12,012
Income per common and common equivalent share...         0.34         0.31         0.54         0.42         0.25
Weighted average common and common equivalent
 shares outstanding.............................       54,527       54,320       54,484       49,735       42,374
</TABLE>

HISTORICAL CONSOLIDATED BALANCE SHEET DATA:

<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                                              -------------------------------------
                                               JUNE 30, 1995     1994         1993         1992
                                               -------------  -----------  -----------  -----------
                                                (UNAUDITED)
<S>                                            <C>            <C>          <C>          <C>
Working capital..............................  $    105,954   $    89,939  $   100,739  $    80,848
Total assets.................................       459,831       453,963      354,798      219,568
Long-term debt (including current portion)...        73,645        71,963       21,151       28,281
Stockholders' equity.........................       304,548       282,200      246,819      139,625
</TABLE>

                                       12
<PAGE>
                                    ENTERRA
                  (AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)

HISTORICAL CONSOLIDATED STATEMENTS OF INCOME DATA:

<TABLE>
<CAPTION>
                                                       SIX MONTHS ENDED
                                                           JUNE 30,                YEAR ENDED DECEMBER 31,
                                                    ----------------------  -------------------------------------
                                                      1995(1)     1994(2)     1994(2)       1993         1992
                                                    -----------  ---------  -----------  -----------  -----------
                                                         (UNAUDITED)
<S>                                                 <C>          <C>        <C>          <C>          <C>
Revenues..........................................  $   229,605  $  92,128  $   302,243  $   165,057  $   150,206
Depreciation and amortization.....................       24,242     12,162       33,104       20,795       17,858
Operating income (loss)...........................      (13,409)     5,031       20,455       14,423       15,853
Net income (loss).................................       (7,088)     4,108       12,517       13,185       14,748
Income (loss) per common and common equivalent
 share............................................        (0.26)      0.25         0.60         0.81         0.92
Weighted average common and common equivalent
 shares outstanding...............................       27,755     16,432       20,832       16,260       16,094
</TABLE>

HISTORICAL CONSOLIDATED BALANCE SHEET DATA:

<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                                              -------------------------------------
                                               JUNE 30, 1995     1994         1993         1992
                                               -------------  -----------  -----------  -----------
                                                (UNAUDITED)
<S>                                            <C>            <C>          <C>          <C>
Working capital..............................  $    167,088   $   161,839  $   111,095  $   116,678
Total assets.................................       677,892       700,007      280,804      254,922
Long-term debt (including current portion)...       129,785       124,596      --           --
Stockholders' equity.........................       443,457       452,434      227,653      209,833
<FN>
- ------------------------
(1)  Operating results for the six months ended June 30, 1995 include an unusual
     charge  of $28.3 million ($0.52 per share) related to a writedown of assets
     and certain restructuring charges. See Note 4 of the Notes to  Consolidated
     Financial  Statements contained in Enterra's  Quarterly Report on Form 10-Q
     for the quarter ended June 30, 1995, which are incorporated by reference in
     this Joint Proxy Statement/Prospectus.

(2)  Operating results for  1994 include  the results of  Total Energy  Services
     Company  from August 12, 1994  (the date of its  acquisition by Enterra) to
     December 31,  1994. See  Note  2 of  the  Notes to  Consolidated  Financial
     Statements  contained in Enterra's Annual Report  on Form 10-K for the year
     ended December 31, 1994, which are incorporated by reference in this  Joint
     Proxy Statement/Prospectus.
</TABLE>

                                       13
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED
                  (AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)

UNAUDITED PRO FORMA STATEMENTS OF INCOME DATA:

<TABLE>
<CAPTION>
                                                      SIX MONTHS ENDED
                                                          JUNE 30,                 YEAR ENDED DECEMBER 31,
                                                  ------------------------  -------------------------------------
                                                     1995         1994         1994         1993         1992
                                                  -----------  -----------  -----------  -----------  -----------
<S>                                               <C>          <C>          <C>          <C>          <C>
Revenues........................................  $   425,775  $   269,939  $   669,657  $   493,206  $   368,386
Depreciation and amortization...................       46,073       28,874       69,533       49,402       35,738
Operating income................................       15,161       29,914       65,704       49,671       35,579
Net income......................................       11,294       21,011       41,977       35,175       26,760
Income per common and common equivalent share...         0.22         0.51         0.94         0.88         0.73
Weighted average common and common equivalent
 shares outstanding.............................       50,716       41,045       44,845       38,607       34,786
</TABLE>

UNAUDITED PRO FORMA BALANCE SHEET DATA:

<TABLE>
<CAPTION>
                                                              JUNE 30, 1995
                                                              -------------
<S>                                                           <C>
Working capital.............................................  $     273,042
Total assets................................................      1,137,723
Long-term debt (including current portion)..................        203,430
Stockholders' equity........................................        748,005
</TABLE>

    The following unaudited adjusted pro forma financial data of Weatherford and
Enterra  combined further give effect to (i) other significant acquisitions made
by Weatherford  and  Enterra  during  1994 and  the  estimated  operational  and
financial  combination benefits resulting from the  Merger and (ii) the items in
clause (i) above plus  consummation of the transactions  set forth in  Enterra's
June  29,  1995 contract  to acquire  Zapata  Energy Industries  (as hereinafter
defined) and estimated operational and financial combination benefits  resulting
from  such transactions. See  "Enterra Corporation --  Recent Developments". For
other information regarding the  adjusted pro forma  data, see "Weatherford  and
Enterra Combined Unaudited Pro Forma Financial Information".

UNAUDITED ADJUSTED PRO FORMA STATEMENTS OF INCOME DATA:

<TABLE>
<CAPTION>
                                                  SIX MONTHS ENDED JUNE 30, 1995       YEAR ENDED DECEMBER 31, 1994
                                                ----------------------------------  ----------------------------------
                                                  AS ADJUSTED     FURTHER ADJUSTED    AS ADJUSTED     FURTHER ADJUSTED
                                                EXCLUDING ZAPATA     FOR ZAPATA     EXCLUDING ZAPATA     FOR ZAPATA
                                                     ENERGY            ENERGY            ENERGY            ENERGY
                                                   INDUSTRIES        INDUSTRIES        INDUSTRIES        INDUSTRIES
                                                ----------------  ----------------  ----------------  ----------------
<S>                                             <C>               <C>               <C>               <C>
Revenues......................................    $    425,775      $    460,698      $    824,524      $    903,060
Depreciation and amortization.................          46,073            49,525            81,774            88,203
Operating income..............................          28,561            35,711           104,780           120,621
Net income....................................          20,004            21,555            64,952            70,154
Income per common and common equivalent
 share........................................            0.39              0.43              1.28              1.38
Weighted average common and common equivalent
 shares outstanding...........................          50,716            50,716            50,679            50,679
</TABLE>

UNAUDITED ADJUSTED PRO FORMA BALANCE SHEET DATA:

<TABLE>
<CAPTION>
                                                                                 JUNE 30, 1995
                                                              ---------------------------------------------------
                                                               AS ADJUSTED EXCLUDING        FURTHER ADJUSTED
                                                                   ZAPATA ENERGY           FOR ZAPATA ENERGY
                                                                    INDUSTRIES                 INDUSTRIES
                                                              -----------------------  --------------------------
<S>                                                           <C>                      <C>
Working capital.............................................       $     273,042             $      309,615
Total assets................................................           1,137,723                  1,272,723
Long-term debt (including current portion)..................             203,430                    338,430
Stockholders' equity........................................             748,005                    748,005
</TABLE>

                                       14
<PAGE>
COMPARATIVE PER SHARE DATA

    The  five  columns  included  in  the  following  table  set  forth  (1) the
historical income per common and common equivalent share and the historical book
value per share data of Weatherford Common Stock; (2) the historical income  per
common  and common equivalent share and the historical book value per share data
of Weatherford Common Stock restated to give effect to the Reverse Stock  Split;
(3)  the historical income (loss) per common and common equivalent share and the
historical book value per share data of Enterra Common Stock; (4) the  unaudited
pro  forma income per common  and common equivalent share  and the unaudited pro
forma book value per share data of Weatherford Common Stock after giving  effect
to  the proposed Merger on a "pooling  of interests" basis and the Reverse Stock
Split; and  (5) the  unaudited pro  forma income  (loss) per  common and  common
equivalent  share and the unaudited pro  forma book value per share attributable
to 0.845 of  a share of  Weatherford Common  Stock (after giving  effect to  the
Reverse  Stock Split)  that will  be received  by Enterra  stockholders for each
share  of  Enterra  Common  Stock  (as   if  Enterra  would  be  the   Surviving
Corporation).  The  information  presented  in  the  table  should  be  read  in
conjunction with the unaudited pro  forma financial statements and the  separate
historical  consolidated financial statements of Weatherford and Enterra and the
notes thereto contained  elsewhere or  incorporated by reference  in this  Joint
Proxy  Statement/Prospectus. See "Weatherford and Enterra Combined Unaudited Pro
Forma  Financial  Information"  and  "Incorporation  of  Certain  Documents   by
Reference".

<TABLE>
<CAPTION>
                                                           HISTORICAL               UNAUDITED PRO FORMA
                                                ---------------------------------  ----------------------
                                                     WEATHERFORD         ENTERRA    COMBINED     ENTERRA
                                                ----------------------  ---------  -----------  ---------
                                                AS REPORTED  RESTATED
                                                -----------  ---------
<S>                                             <C>          <C>        <C>        <C>          <C>
INCOME (LOSS) PER COMMON AND COMMON
 EQUIVALENT SHARE:
Six months ended June 30,
  1995........................................   $    0.34   $    0.67  $   (0.26)  $    0.22   $    0.19
Year ended December 31,
  1994........................................        0.54        1.08       0.60        0.94        0.79
  1993........................................        0.42        0.84       0.81        0.88        0.74
  1992........................................        0.25        0.49       0.92        0.73        0.62
BOOK VALUE PER SHARE:
June 30, 1995.................................        5.61       11.22      15.97       14.78       12.49
December 31, 1994.............................        5.21       10.42      16.31       14.54       12.29
</TABLE>

                                       15
<PAGE>
                             SPECIAL CONSIDERATIONS

SPECIAL CONSIDERATIONS WITH RESPECT TO WEATHERFORD

    NONPAYMENT  OF DIVIDENDS.  Weatherford has not declared or paid dividends on
the Weatherford Common Stock since December 1982 and does not anticipate  paying
dividends on the Weatherford Common Stock at any time in the foreseeable future.
See "Market Price of Common Stock -- Dividend Information".

SPECIAL CONSIDERATIONS WITH RESPECT TO ENTERRA

    NONPAYMENT  OF DIVIDENDS.  Enterra has not declared or paid dividends on the
Enterra Common Stock since 1984  and does not currently  plan to declare or  pay
any  dividends on the Enterra Common Stock. See "Market Price of Common Stock --
Dividend Information".

    FIRST RESERVE GROUP.   The  First Reserve Funds,  which are  all managed  by
First  Reserve, will own approximately 18.7%  of the Weatherford Common Stock to
be outstanding following the Merger. The shares beneficially owned by the  First
Reserve  Group will be  subject to the provisions  of the Stockholders Agreement
which, among other things, restricts the  voting and disposition of such  shares
and  the acquisition of additional Weatherford Common Stock by the First Reserve
Group. The Stockholders Agreement permits certain of the First Reserve Funds  to
designate  for  nomination  up to  two  directors  to the  Weatherford  Board of
Directors (based  on the  percentage of  Weatherford Common  Stock  beneficially
owned  by the First Reserve Group), and immediately following the Merger, two of
the Surviving Corporation's ten directors will be designees of the First Reserve
Funds. The Stockholders Agreement is for a term commencing at the Effective Time
and  continuing  until  August  12,  2004,  subject  to  suspension  of  certain
provisions  set  forth  therein  during periods  when  the  First  Reserve Group
beneficially owns less than 10% of  the Weatherford Common Stock. The shares  of
Weatherford  Common Stock owned by the First  Reserve Funds will be eligible for
resale in  the public  market subject  to the  volume restrictions  of Rule  144
promulgated  under  the  Securities Act  ("Rule  144"); in  addition,  the First
Reserve Funds have demand and piggyback registration rights with respect to such
shares. See  "Terms of  the  Merger --  Stockholders Agreement  --  Registration
Rights".  Future sales  of shares  by the  First Reserve  Funds under  Rule 144,
through the exercise of registration rights or otherwise, could have an  adverse
effect  on the market  price of the  Weatherford Common Stock  and could make it
more difficult for Weatherford  to raise funds through  equity financing in  the
future.  It is not  possible to estimate the  number of shares  that may be sold
under Rule 144 or  pursuant to registration rights  since this will depend  upon
the  market price for the Weatherford Common Stock, the individual circumstances
of the sellers and other factors.

SPECIAL CONSIDERATIONS WITH RESPECT TO THE COMBINED COMPANY

    INDUSTRY VOLATILITY.   The oil  and gas  industry in  which Weatherford  and
Enterra  participate historically has experienced significant volatility. Demand
for Weatherford's and Enterra's services and products depends primarily upon the
number of oil and gas wells being drilled, the depth and drilling conditions  of
such  wells, the volume  of production, the  number of well  completions and the
level of  workover  activity.  Drilling  and  workover  activity  can  fluctuate
significantly  in a short period of time,  particularly in the United States and
Canada.

    The willingness of oil  and gas operators to  make capital expenditures  for
the  exploration  and production  of oil  and  natural gas  will continue  to be
influenced by  numerous  factors over  which  Weatherford and  Enterra  have  no
control, including the prevailing and expected market prices for oil and natural
gas.  Such  prices are  impacted by,  among  other factors,  the ability  of the
members of  the  Organization  of  Petroleum  Exporting  Countries  ("OPEC")  to
maintain  price  stability through  voluntary  production limits,  the  level of
production by  non-OPEC countries,  worldwide demand  for oil  and gas,  general
economic   and  political  conditions,  costs  of  exploration  and  production,
availability  of  new  leases  and  concessions,  and  governmental  regulations
regarding, among other things, environmental

                                       16
<PAGE>
protection,  taxation, price controls and  product allocations. No assurance can
be given as to the level of future  oil and gas industry activity or demand  for
Weatherford's and Enterra's services and products.

    COMPETITION.   Weatherford and Enterra  provide specialized equipment, tools
and tubular  goods  ("rental tools")  and  fishing tools  and  related  services
("fishing  tools and services")  primarily to oil  and gas production companies,
drilling contractors and  well servicing companies.  Fishing tools and  services
are  used for recovery or retrieval of foreign  objects in oil and gas wells and
for repairs of  existing wells. Weatherford  and Enterra are  among the  largest
companies engaged in the rental tools and fishing tools and services businesses.
However,  Weatherford and  Enterra each  encounter substantial  competition from
numerous small,  single-site operators,  larger concerns  operating at  multiple
locations  and various well  servicing companies engaged  in such businesses. In
addition, many customers own and operate large inventories of the equipment they
might otherwise  choose to  rent and  have the  ability to  purchase  additional
equipment, as opposed to renting.

    Weatherford  and Enterra  expect that the  substantial competition currently
encountered by each company in the  rental tools and fishing tools and  services
businesses will not be reduced or eliminated by the Merger. Furthermore, each of
Weatherford's   and  Enterra's  other   businesses  also  encounter  substantial
competition.

    POSSIBLE PRODUCT LIABILITY CLAIMS.  Certain products manufactured or  leased
by   Weatherford  or  Enterra  are   used  in  potentially  hazardous  drilling,
completion, production and workover applications that can cause personal  injury
or  loss of life as well as damage to property, equipment or the environment and
suspension of operations. Litigation arising from a catastrophic occurrence at a
location where Weatherford's or Enterra's equipment and services are used may in
the future  result in  Weatherford or  Enterra  being named  as a  defendant  in
product  liability or other lawsuits asserting potentially large claims. Each of
Weatherford  and  Enterra  maintains  insurance  coverage  that  its  management
believes to be customary in the industry for a company of its size against these
hazards. However, insurance may not provide complete protection against casualty
losses  and  a  successful  claim  could  have  a  material  adverse  effect  on
Weatherford or Enterra. Further, no assurance  can be given that Weatherford  or
Enterra  will be  able to  maintain adequate  insurance in  the future  at rates
considered reasonable.

    RISKS RELATED TO INTERNATIONAL OPERATIONS.   During 1994, approximately  47%
of  Weatherford's  revenues and  approximately  32% of  Enterra's  revenues were
derived from sales  and rentals outside  of the United  States and Canada  based
upon  the ultimate destination in which equipment or services were sold, shipped
or provided to the customer. Certain of these operations are subject to  special
risks  inherent in doing business outside  the United States, including risks of
war, civil disturbances and  governmental activities that  may limit or  disrupt
markets, restrict the movement of funds or result in the deprivation of contract
rights  or  the taking  of property  without  fair compensation.  Certain areas,
including the Commonwealth of Independent States, Algeria and Nigeria, have been
subjected to political disruption  or social unrest in  the past twelve  months.
Foreign  operations also  can be  affected by  laws and  regulations limiting or
prohibiting exports to and operations  in particular countries, including  Iran,
Iraq and Libya. Government-owned petroleum companies in some of the countries in
which  Weatherford and Enterra operate have  adopted policies (or are subject to
governmental policies) giving preference to  the purchase of goods and  services
from  companies that are majority-owned by local  nationals. As a result of such
policies, Weatherford and Enterra rely  on joint ventures, license  arrangements
and  other business  combinations with  local nationals  in these  countries. In
addition, political  considerations  may disrupt  the  commercial  relationships
between   Weatherford  or  Enterra  and  government-owned  petroleum  companies.
Generally, business interruptions resulting from civil or political  disruptions
negatively  impact  near-term  results of  operations;  however,  managements of
Weatherford and Enterra believe that it  is unlikely that any specific  business
disruption  caused by existing  or foreseen civil  or political instability will
have a materially  adverse impact  on the  financial condition  or liquidity  of
Weatherford or Enterra.

                                       17
<PAGE>
    GOVERNMENTAL  REGULATION  AND  ENVIRONMENTAL  MATTERS.    Weatherford's  and
Enterra's businesses are affected both  directly and indirectly by  governmental
regulations  relating  to the  oilfield  service industry  and  the oil  and gas
exploration and production industry in general, as well as by environmental  and
safety regulations that specifically apply to such businesses. It is likely that
the trend of more expansive and stricter environmental laws and regulations will
continue,  and that the costs of compliance  with such laws and regulations will
continue to increase in the foreseeable future, both for Weatherford and Enterra
and for their customers. There can be  no assurance that the cost of  compliance
with current environmental and safety regulations or future changes in such laws
and  regulations will  not have a  material adverse effect  on Weatherford's and
Enterra's operations.

    STOCKHOLDER LITIGATION.   On June  28, 1995,  a class  action complaint  was
filed  against Enterra  and members  of its Board  of Directors  in the Delaware
Court of  Chancery  in  New  Castle County.  The  complaint  alleges  breach  of
fiduciary  duty and other matters and seeks damages in an unspecified amount and
injunctive relief to prevent the consummation  of the Merger. On July 17,  1995,
an  answer to  the complaint  was filed by  the defendants  denying the material
allegations. On August 25, 1995, Enterra learned that an additional class action
complaint had been filed  in the same  court on June  27, 1995 against  Enterra,
members of Enterra's Board of Directors and Weatherford, but not yet served upon
Enterra, Weatherford or, to their knowledge, the other defendants. The complaint
sets forth similar allegations as set forth in the other complaint.

                     WEATHERFORD INTERNATIONAL INCORPORATED

GENERAL

    Weatherford  is a diversified international energy service and manufacturing
company that provides a  variety of services  and equipment to  the oil and  gas
industry.  Weatherford's  principal  businesses  consist  of  providing  tubular
handling services, renting specialized oilfield equipment and providing  fishing
services  and related tools, and  manufacturing and selling cementation products
and other  equipment.  Weatherford  operates  in virtually  every  oil  and  gas
exploration and production region in the world.

RECENT DEVELOPMENTS

    In  connection with  the Merger,  Weatherford has  entered into negotiations
with certain banks  to provide new  credit facilities to  Weatherford as of  the
Effective  Time. Such credit facilities  are expected to consist  of a term loan
and revolving credit facility for  approximately $475 million in the  aggregate.
Proceeds  from such credit facilities are expected  to be available (i) to repay
existing  indebtedness  of  Weatherford  and   Enterra,  (ii)  to  finance   the
acquisition  of Zapata Energy  Industries (if such  transaction is consummated),
(iii) to pay  the transaction and  financing costs associated  with the  Merger,
such  new credit facilities and the  acquisition of Zapata Energy Industries (if
such transaction  is  consummated),  (iv) to  pay  certain  consolidation  costs
associated  with  the  Merger and  (v)  for  working capital  and  other general
corporate purposes. The new credit facilities  are expected to be unsecured  and
to require that Weatherford maintain certain financial ratios, including minimum
tangible  net  worth, a  debt-to-capitalization ratio  and an  interest coverage
ratio.

    On August 25, 1995,  Weatherford learned that a  class action complaint  had
been  filed in the Delaware  Court of Chancery in New  Castle County on June 27,
1995 against Enterra, members of  Enterra's Board of Directors and  Weatherford,
but  not yet served upon Enterra, Weatherford  or, to their knowledge, the other
defendants. See "Enterra Corporation -- Recent Developments".

                              ENTERRA CORPORATION

GENERAL

    Enterra is a worldwide provider of specialized services and products to  the
oil and gas industry through its oilfield, pipeline and compression services and
equipment   businesses.  Enterra's  oilfield  services  and  equipment  business
consists primarily of the rental and sale of equipment used in oil and gas  well
drilling,  completion, production and  workover activities and  the provision of
well control

                                       18
<PAGE>
assistance and fishing  services. The pipeline  services and equipment  business
consists of the rental and sale of specialized equipment used in construction or
rehabilitation  of oil and gas pipelines. The compression services and equipment
business consists of the rental  and sale of gas  compressor systems for use  in
the production and transportation of natural gas.

RECENT DEVELOPMENTS

    On  June 28, 1995,  a class action  complaint was filed  against Enterra and
members of its  Board of  Directors in  the Delaware  Court of  Chancery in  New
Castle  County. The complaint alleges breach of fiduciary duty and other matters
and seeks damages in an unspecified amount and injunctive relief to prevent  the
consummation  of the Merger.  On July 17,  1995, an answer  to the complaint was
filed by the defendants denying the material allegations.

    On August  25,  1995,  Enterra  learned  that  an  additional  class  action
complaint  had been filed  in the same  court on June  27, 1995 against Enterra,
members of Enterra's Board of Directors and Weatherford, but not yet served upon
Enterra, Weatherford or, to their knowledge, the other defendants. The complaint
sets forth similar allegations as set forth in the other complaint.

    On June 29,  1995, Enterra  and Zapata Corporation,  a Delaware  corporation
("Zapata"),  entered  into a  contract  providing for  Enterra's  acquisition of
Zapata's natural  gas compression  businesses ("Zapata  Energy Industries")  for
$130  million.  The contract  is  subject to  expiration  or termination  of the
waiting period under  the HSR  Act and signing  of a  definitive asset  purchase
agreement containing customary and reasonable representations and warranties and
indemnification  provisions.  A dispute  has  arisen regarding  the transaction.
While Enterra  and Zapata  are  currently engaged  in discussions  with  respect
thereto,  Enterra intends to pursue appropriate legal remedies, if necessary, to
complete the transaction.  However, there can  be no assurance  that the  Zapata
Energy  Industries acquisition will be consummated  or that, if consummated, the
final terms will  be consistent  with the June  29 contract.  If any  additional
consideration  is paid or if any liabilities are assumed, such will result in an
increase in goodwill and the expected amortization over its 40-year life. Zapata
Energy Industries is engaged in  the business of renting, fabricating,  selling,
installing and servicing natural gas compressor packages used in the oil and gas
industry.  Natural gas  compression is  used in  the production,  processing and
delivery of natural  gas. Zapata  Energy Industries is  headquartered in  Corpus
Christi,  Texas and  maintains a  network of  15 sales  and services  offices in
Texas, Louisiana,  Oklahoma,  Arkansas  and  New  Mexico.  While  Zapata  Energy
Industries'  operations are primarily domestic,  it sells natural gas compressor
packages in several international natural  gas producing regions. Its  customers
include  natural gas companies  that are involved  in the production, processing
and transmission of natural gas. See Enterra's Current Report on Form 8-K  dated
August  28,  1995,  which  is  incorporated by  reference  in  this  Joint Proxy
Statement/Prospectus,   for   additional   information,   including    financial
information, with respect to Zapata Energy Industries.

                     GENERAL INFORMATION ABOUT THE MEETINGS

DATE, TIME AND PLACE OF SPECIAL MEETINGS

    The Weatherford Special Meeting will be held at 10:30 a.m., Houston time, on
Thursday,  October 5, 1995, at The  Ritz-Carlton, 1919 Briar Oaks Lane, Houston,
Texas. The Enterra Special Meeting will be held at 10:00 a.m., Houston time,  on
Thursday,  October 5, 1995, at The  Ritz-Carlton, 1919 Briar Oaks Lane, Houston,
Texas.

RECORD DATE AND OUTSTANDING SHARES

    Only holders of record of Weatherford Common Stock and holders of record  of
Enterra Common Stock at the close of business on August 24, 1995 are entitled to
notice  of  the Weatherford  Special Meeting  and  the Enterra  Special Meeting,
respectively, and to  vote at the  Weatherford Special Meeting  and the  Enterra
Special Meeting, respectively, or any adjournment thereof.

    At  the close of  business on the  Record Date, there  were 2,572 holders of
record of Weatherford Common Stock with 54,354,258 shares issued and outstanding
and 1,730 holders of record of Enterra

                                       19
<PAGE>
Common Stock  with  27,822,950 shares  issued  and outstanding.  Each  share  of
Weatherford Common Stock and Enterra Common Stock entitles the holder thereof to
one vote on each matter submitted for stockholder approval.

VOTE REQUIRED

    WEATHERFORD.    Weatherford's  By-laws  provide  that  the  presence  at the
Weatherford Special Meeting, in person or by proxy, of the holders of a majority
of the issued  and outstanding shares  of Weatherford Common  Stock entitled  to
vote  thereat will  constitute a quorum  for the transaction  of business. Under
Delaware law,  approval and  adoption of  the Merger  and the  Merger  Agreement
require  the affirmative  vote of  the holders  of a  majority of  the shares of
Weatherford Common Stock  issued and  outstanding and  entitled to  vote at  the
Weatherford  Special Meeting, or 27,177,130 shares. Under Delaware law, the 1991
Option Plan and the Restricted Plan, as applicable, approval and adoption of the
Reverse Stock Split, the  Name Change and the  Weatherford Plan Amendments  each
require  the affirmative  vote of  the holders  of a  majority of  the shares of
Weatherford Common Stock present in person or represented by proxy and  entitled
to  vote thereon at the Weatherford Special Meeting. At the close of business on
the Record Date, the directors and officers of Weatherford and their  affiliates
held  1,684,573 shares  of Weatherford Common  Stock, representing approximately
3.1% of the outstanding shares. Such persons have indicated to Weatherford  that
they  intend to vote their  shares in favor of the  approval and adoption of the
Merger, the Merger Agreement, the Reverse  Stock Split, the Name Change and  the
Weatherford  Plan  Amendments. None  of the  Merger,  the Merger  Agreement, the
Reverse Stock Split and the Name Change will be effected unless all such matters
are approved and adopted by the  stockholders of Weatherford and the Merger  and
the  Merger Agreement are  approved and adopted by  the stockholders of Enterra.
The amendment to the 1991  Option Plan will not  be effected unless the  Merger,
the  Merger Agreement, the Reverse Stock Split  and the Name Change are approved
and adopted by  the stockholders of  Weatherford and the  Merger and the  Merger
Agreement are approved and adopted by the stockholders of Enterra. The amendment
to  the Restricted Plan will be effected  regardless of whether any of the other
proposals are  approved and  adopted  by the  stockholders of  Weatherford.  The
Merger,  the Merger Agreement, the Reverse Stock  Split and the Name Change will
be effected regardless of whether either or  both of the amendments to the  1991
Option Plan and the Restricted Plan are approved and adopted by the stockholders
of Weatherford.

    Pursuant to the rules of the NYSE, the affirmative vote of a majority of the
shares  of  Weatherford Common  Stock  present or  represented  by proxy  at the
Weatherford Special Meeting is required to approve and adopt the Merger and  the
Merger  Agreement, so long as the number of votes cast on each matter represents
a majority of the  shares entitled to  vote on such  matter. NYSE rules  require
stockholder approval for the issuance of common stock, or securities exercisable
for  common stock, in connection  with a transaction if  the common stock has or
will have upon issuance voting power equal to or in excess of 20% of the  voting
power  outstanding  before  the  issuance of  such  common  stock  or securities
exercisable for common stock. The number  of shares of Weatherford Common  Stock
to  be issued  in the Merger  would equal  approximately 86.5% of  the shares of
Weatherford Common Stock outstanding prior to the Merger.

    ENTERRA.  Enterra's By-laws provide that the presence at the Enterra Special
Meeting, in person  or by proxy,  of the holders  of a majority  of the  Enterra
Common Stock issued and outstanding and entitled to vote thereat will constitute
a  quorum  for the  transaction of  business. Under  Delaware law,  approval and
adoption of the Merger and the Merger Agreement require the affirmative vote  of
the  holders of  a majority  of the  shares of  Enterra Common  Stock issued and
outstanding on the  Record Date,  or 13,911,476  shares. First  Reserve and  the
First   Reserve  Funds  have  entered   into  the  Stockholders  Agreement  with
Weatherford pursuant to which they have agreed to vote the 11,212,349 shares  of
Enterra   Common  Stock  over  which  they  have  voting  control,  representing
approximately 40.3% of the outstanding shares,  in favor of the adoption of  the
Merger  Agreement unless  the Enterra  Board of  Directors, at  the time  of the
Enterra Special  Meeting, is  recommending that  the Enterra  stockholders  vote
against  the adoption  of the  Merger Agreement  in view  of the  pendency of an
Enterra Superior Proposal. If, at the  time of the Enterra Special Meeting,  the
Enterra

                                       20
<PAGE>
Board  of Directors is  recommending that the  Enterra stockholders vote against
the adoption of the Merger Agreement, First Reserve and the First Reserve  Funds
have  agreed with Enterra that they will  vote the foregoing shares against such
adoption. See "The Merger -- Interests of Certain Persons in the Merger". At the
close of business on the Record Date, the directors and officers of Enterra  and
their  affiliates,  excluding  the  First Reserve  Group,  held  109,332 shares,
representing approximately 0.4% of the outstanding shares and have indicated  to
Enterra  that they  intend to  vote their  shares in  favor of  the approval and
adoption of the Merger and the Merger Agreement.

VOTING AND REVOCATION OF PROXIES
    All properly executed  proxies that  are not revoked  will be  voted at  the
Weatherford  Special Meeting and the Enterra  Special Meeting, as applicable, in
accordance with the instructions contained  therein. If a holder of  Weatherford
Common  Stock or a holder  of Enterra Common Stock  executes and returns a proxy
and does not  specify otherwise, the  shares represented by  such proxy will  be
voted "for" approval and adoption of the Merger and the Merger Agreement, and in
the case of a holder of Weatherford Common Stock, "for" approval and adoption of
each  of  the Reverse  Stock Split,  the  Name Change  and the  Weatherford Plan
Amendments, in accordance with  the recommendation of  the Weatherford Board  of
Directors  and  the  Enterra  Board  of  Directors,  respectively.  Checking the
abstention box on the  proxy card or  failing to return the  proxy card has  the
same  effect as  voting against the  proposals. A stockholder  of Weatherford or
stockholder of Enterra who has  executed and returned a  proxy may revoke it  at
any  time before it is voted at  the respective Special Meeting by executing and
returning a  proxy  bearing a  later  date, by  filing  written notice  of  such
revocation  with the Secretary of Weatherford  or Enterra, as appropriate, or by
attending the Special Meeting and voting in person.

    Under applicable  stock exchange  rules, brokers  will not  be permitted  to
submit  proxies  authorizing a  vote on  the Merger,  the Merger  Agreement, the
Reverse Stock Split, the Name Change and the Weatherford Plan Amendments in  the
absence  of specific instructions from  beneficial owners. Broker non-votes will
have the effect of votes against  the Merger, the Merger Agreement, the  Reverse
Stock Split, the Name Change and the Weatherford Plan Amendments. Under Delaware
law,  both abstentions and  broker non-votes contained on  a returned proxy card
will be considered present for purposes of determining the existence of a quorum
at the Weatherford Special Meeting or the Enterra Special Meeting.

SOLICITATION OF PROXIES
    In addition to solicitation by  mail, the directors, officers and  employees
of  each of  Weatherford and Enterra  may solicit proxies  from their respective
stockholders  by  personal   interview,  telephone,   facsimile  or   otherwise.
Weatherford  and Enterra will each bear the costs of the solicitation of proxies
from their respective  stockholders, except  that Weatherford  and Enterra  will
share  the cost  of printing this  Joint Proxy Statement/Prospectus  pro rata in
accordance with their  respective number  of record  holders. Arrangements  also
will be made with brokerage firms and other custodians, nominees and fiduciaries
who  hold the  voting securities  of record  for the  forwarding of solicitation
materials to  the  beneficial  owners  thereof.  Weatherford  and  Enterra  will
reimburse  such brokers, custodians, nominees and fiduciaries for the reasonable
out-of-pocket expenses incurred by them in connection therewith. Weatherford and
Enterra each has  engaged the services  of Beacon Hill  Partners, Inc., a  proxy
solicitation  firm, to distribute proxy solicitation materials to brokers, banks
and other  nominees and  to assist  in the  solicitation of  proxies from  their
respective  stockholders for an  anticipated fee of  $7,000 from Weatherford and
$5,000 from Enterra, plus mailing expenses.

OTHER MATTERS
    As of the  date of  this Joint Proxy  Statement/Prospectus, the  Weatherford
Board  of  Directors and  the  Enterra Board  of Directors  do  not know  of any
business to be presented at their respective Special Meetings other than as  set
forth  in the notices accompanying this Joint Proxy Statement/Prospectus. If any
other matters should properly come before the respective Special Meetings, it is
intended that the shares  represented by proxies will  be voted with respect  to
such matters in accordance with the judgment of the persons voting such proxies.

                                       21
<PAGE>
                                   THE MERGER

    The  detailed terms  and conditions  to the  consummation of  the Merger are
contained in the Merger Agreement, which is attached as Appendix A to this Joint
Proxy Statement/Prospectus and incorporated  herein by reference. The  following
discussion  sets forth a description of certain material terms and conditions of
the Merger Agreement. THE DESCRIPTION  IN THIS JOINT PROXY  STATEMENT/PROSPECTUS
OF  THE TERMS AND CONDITIONS TO THE  CONSUMMATION OF THE MERGER IS QUALIFIED BY,
AND MADE  SUBJECT TO,  THE MORE  COMPLETE INFORMATION  SET FORTH  IN THE  MERGER
AGREEMENT.

GENERAL DESCRIPTION OF THE MERGER

    The Merger Agreement provides that, at the Effective Time, the businesses of
Enterra  and Weatherford will be  combined pursuant to a  merger of Enterra with
and into Weatherford,  with Weatherford becoming  the Surviving Corporation.  At
the  Effective Time, Weatherford  will change its  name to "Weatherford Enterra,
Inc." Pursuant to  the Merger, each  outstanding share of  Enterra Common  Stock
will  be converted into the  right to receive 1.69  shares of Weatherford Common
Stock, before giving  effect to the  Reverse Stock  Split (0.845 of  a share  of
Weatherford  Common Stock after  giving effect to the  Reverse Stock Split). See
"Terms of the Merger -- Manner and Basis of Converting Shares".

    Based upon the  number of  shares of  Weatherford Common  Stock and  Enterra
Common  Stock outstanding  as of  the Record  Date and  taking into  account the
Reverse Stock  Split (not  including  any Weatherford  or Enterra  stock  option
shares),  approximately 50,688,000  shares of  Weatherford Common  Stock will be
outstanding immediately  following the  Effective Time,  of which  approximately
23,510,000  shares, representing approximately 46.4% of  the total, will be held
by former holders of Enterra Common Stock.

BACKGROUND

    WEATHERFORD.  Weatherford is a diversified international energy service  and
manufacturing  company that provides a variety  of services and equipment to the
oil and gas  industry. Weatherford's principal  businesses consist of  providing
tubular  handling services, renting specialized oilfield equipment and providing
fishing services and  related tools, and  manufacturing and selling  cementation
products  and other equipment.  Weatherford operates in  virtually every oil and
gas exploration and production region in the world.

    Historically, Weatherford was predominantly  a tubular running services  and
cementation  products  company with  extensive  international operations.  A new
management team implemented  a new business  strategy in 1991  which focused  on
improving  Weatherford's  U.S. market  position  and pursuing  opportunities for
expansion into related oilfield service businesses. Accordingly, Weatherford has
undertaken to  offer  a  broader  mix  of services  and  products  in  U.S.  and
international  markets, to  be a  leading participant  in each  of its principal
businesses, to differentiate itself  in terms of the  quality and technology  of
its  services and products and to pursue  cost efficiencies in both its existing
operations and its newly acquired businesses.

    Management has pursued this strategy through a series of acquisitions. Since
November 1991, Weatherford has acquired  20 businesses, including eight in  1994
and  two in  1995. In  November 1991,  Weatherford acquired  Petroleum Equipment
Tools Co. ("Petco"), a  major participant in the  rental tools and fishing  tool
services  market, thereby adding  a new business.  In November 1992, Weatherford
expanded its position  in cementation  products with the  acquisition of  Gemoco
(formerly,  a  division  of Sequa  Engineered  Services, Inc.).  In  April 1993,
Weatherford acquired substantially  all of  the assets  of Homco  International,
Inc.  and its subsidiaries (collectively, "Homco"), which significantly expanded
Weatherford's rental  tools and  fishing tool  services business.  In  September
1993,  Weatherford acquired  the operations of  the Premier  group of companies,
making Weatherford  a  leading provider  of  rental tools  in  the  Asia-Pacific
region.  In April 1994, Weatherford acquired the rental tool assets and business
of Odfjell  Drilling  and  Consulting  Company A/S,  a  Norwegian  company  with
operations  in the North Sea and the Asia-Pacific region, making Weatherford the
leading rental tool company in these  areas. In July 1994, Weatherford  acquired
the assets of Gillette & Whitehead Drilling Services

                                       22
<PAGE>
Ltd.,  a provider of rental tools in the Middle East region and the Asia-Pacific
region. In September  1994, Weatherford acquired  H&H Oil Tool  Co., Inc. ("H  &
H"),  a California-based  company engaged in  the rental tools  and fishing tool
services business,  principally  in  California  and  the  Rocky  Mountains.  In
addition,  from 1992  through 1995,  Weatherford has  strengthened its principal
businesses,  internationally   and   domestically,   through   several   smaller
acquisitions.

    As a result of these acquisitions, Weatherford is an industry leader in each
of  its three  principal businesses and  has expanded the  products and services
offered by Weatherford, improved Weatherford's U.S. market position and realized
significant consolidation cost  savings. Weatherford's  management believes  the
Merger is consistent with the business strategy implemented in 1991.

    ENTERRA.    Enterra  is a  worldwide  provider of  specialized  services and
products to  the  oil  and  gas industry  through  its  oilfield,  pipeline  and
compression services and equipment businesses.

    Until  1987, Enterra's  operations involved two  industry segments, products
and  oilfield  services.  The  oilfield  services  operations  involved  renting
specialized  equipment for drilling  and servicing onshore  and offshore oil and
gas wells, both  within the United  States and foreign  countries, and has  been
continued  to date as a part of Enterra's existing oilfield services operations.
The products segment involved the manufacture and sale of products for  fighting
fires,  emergency  rescue  equipment,  specialty  chemicals  and instrumentation
products.

    In 1986, Enterra conducted an evaluation of its overall operations in  light
of  conditions  then existing  in the  oil  and gas  industry and  its financial
position and operating strengths  at that time.  As a result  of this review,  a
broad strategy was developed to sell the products segment described above and to
focus on providing specialized products and services to the oil and gas industry
through  the  expansion  of Enterra's  present  lines of  business,  in existing
markets as  well as  into new  geographic territories,  and expansion  into  new
segments  of the energy products and  services industry through acquisitions and
internal development.

    Specifically, the strategic  plan that  evolved during this  period of  time
involved four basic elements:

    - IMPROVE  MARKET  POSITION IN  ENTERRA'S TRADITIONAL  BUSINESSES. Enterra's
      goal has been to improve its market position in its traditional businesses
      through geographical expansion, better utilization of assets and selective
      additions to rental inventories. In  addition, Enterra has focused on  the
      development  of innovative products and  services in the oilfield services
      and equipment segment. Since the beginning of 1988, Enterra has made  over
      $100  million  of  capital  expenditures  in  connection  with  this goal,
      including in  1989  the  substantial expansion  of  its  fishing  services
      businesses.  The emphasis has been on production-related activities, which
      management of Enterra believes tend to be a more stable source of  revenue
      than drilling-related activities.

    - COMPLETE  STRATEGIC ACQUISITIONS WITHIN EXISTING LINES OF BUSINESS. In the
      late 1970's through early  1980's, there was a  substantial growth in  the
      oil  and gas  service industry  in the United  States due  to increases in
      prices for oil and  gas. This trend reversed  itself dramatically in  1982
      and  throughout the mid  and later part  of the 1980's,  and continuing to
      date, the  oil and  gas service  industry has  been through  a process  of
      consolidation. It has been Enterra's strategy to be a major participant in
      this  consolidation through strategic acquisitions  and mergers within the
      scope of its existing businesses. Enterra's  goal has been to lower  costs
      through  consolidation cost savings, expand geographic market coverage and
      broaden product and service lines,  principally in the production  sector.
      As  part  of  this  process, Enterra  considered  and  actively negotiated
      potential consolidations with several  rental tool and fishing  businesses
      acquired  by  Weatherford,  including  Petco, Homco  and  H  &  H. Enterra
      regularly reviews potential business  acquisitions in its core  businesses
      and is currently pursuing a substantial acquisition in its gas compression
      business. See "Enterra Corporation -- Recent Developments".

                                       23
<PAGE>
    - ACQUIRE  ONE OR  MORE ADDITIONAL  "LEGS". The  third element  of Enterra's
      strategic plan has been to add additional core businesses or "legs" around
      its focus of providing  specialized services and products  to the oil  and
      gas  industry.  The 1988  acquisition of  Enterra's pipeline  services and
      equipment segment provided one additional  "leg" and the 1994  acquisition
      of  Enterra's  gas  compression services  and  equipment  segment provided
      another additional "leg".

    - MAINTAIN STRONG BALANCE SHEET. Enterra's  strategy has been to maintain  a
      low level of long-term debt as a percentage of total capitalization.

    Enterra  believes that the merger with Weatherford is consistent with and an
important element in its long-standing strategic plan. See "-- Joint Reasons for
the Merger" and "-- Enterra's Reasons for the Merger".

    MERGER NEGOTIATIONS.    In late  March  1995, Philip  Burguieres,  Chairman,
President  and Chief Executive Officer of  Weatherford, telephoned D. Dale Wood,
Chairman, President  and  Chief Executive  Officer  of Enterra,  to  schedule  a
meeting  with Mr. Wood to discuss a possible business combination of Weatherford
and Enterra. On March  30, 1995, Messrs.  Burguieres and Wood  met to discuss  a
possible  business combination of the companies. Although there were discussions
of a preliminary nature in late 1990 between Weatherford and Enterra regarding a
possible business  combination,  there had  been  no contacts  since  that  time
between  the Chief Executive Officers or  other representatives of the companies
to discuss such a combination.

    During the next several  weeks, Messrs. Burguieres  and Wood, together  with
William E. Macaulay (Vice Chairman of Enterra and chief executive officer of its
largest  stockholder,  First Reserve),  had  additional discussions  regarding a
possible business combination and  various related issues  and concluded that  a
merger  of the  two companies  might be beneficial  to the  stockholders of each
company. On May  1, 1995, Messrs.  Burguieres and Wood,  together with James  R.
Burke, Weatherford's Senior Vice President, Corporate Development and Marketing,
and Steven C. Grant, Enterra's Senior Vice President, Corporate Development, met
with  representatives  of  Simmons  to review  a  possible  business combination
previously discussed by Messrs. Burguieres,  Wood and Macaulay on a  preliminary
basis,  which would then be submitted  for consideration by each company's Board
of Directors. Enterra and Weatherford asked Simmons to assist management of both
companies in developing  a preliminary estimate  of possible consolidation  cost
savings  that might result from a combination  of Weatherford and Enterra and to
analyze the recent performance and current market valuations of both  companies.
Such information was provided to Messrs. Burguieres and Wood on May 10, 1995, to
the  Enterra Board  of Directors prior  to its May  10, 1995 meeting  and to the
Weatherford Board of Directors prior to its May 11, 1995 meeting. Both companies
agreed that if the Board of Directors of each company made a decision to proceed
further with the  transaction, then  Simmons would  be retained  by Enterra  and
Weatherford would retain a separate financial advisor.

    On May 10, 1995, Messrs. Burguieres and Wood preliminarily determined that a
conversion  rate of 1.69  shares of Weatherford  Common Stock for  each share of
Enterra Common Stock, before giving effect to the Reverse Stock Split (0.845  of
a  share of Weatherford  Common Stock after  giving effect to  the Reverse Stock
Split), which  was  based  on  recent  and  historical  trading  prices  of  the
Weatherford  Common Stock  and the Enterra  Common Stock,  would be appropriate,
subject to review  and analysis by  management and financial  advisors for  each
company,  negotiation of terms by the  parties and review, analysis and approval
by the Weatherford Board of Directors and the Enterra Board of Directors.

    At a meeting of  the Enterra Board  of Directors held on  May 10, 1995,  Mr.
Wood  reported  on  discussions  among Messrs.  Wood,  Macaulay  and Burguieres,
including the proposed  conversion rate,  and that management  was evaluating  a
potential  merger with Weatherford. Prior to the meeting, the directors received
materials prepared by Simmons. Nine of  the eleven directors of Enterra at  that
time were present in person at the meeting. Representatives of Simmons presented
a  report to the  Board comparing Enterra and  Weatherford, analyzing the recent
performance and  current and  historical market  valuations of  both  companies,
summarizing    the    potential    consolidation    cost    savings    and   the

                                       24
<PAGE>
potential benefits thereof and describing the potential increase to  stockholder
value  due to both the value created  through the consolidation cost savings and
the  potential  enhancement  of  the  combined  company's  EBDIT  multiple   and
price-to-cash-flow  multiple.  An  estimate of  consolidation  cost  savings was
prepared by  managements  of  both companies  with  Simmons'  assistance,  which
indicated  that consolidation  cost savings of  $26.8 million  annually could be
achieved, exclusive of certain other  potential consolidation cost savings  that
were   still  under  review.  Simmons  reviewed  the  calculation  of  potential
consolidation  cost  savings  prepared  by  managements  of  the  companies  and
determined,  in view of  the exclusion of such  potential additional savings, to
assume annual consolidation  cost savings  of $30  million for  purposes of  its
analysis.  In addition, based upon its  extensive experience in advising clients
with respect to mergers and acquisitions involving consolidation of companies in
the oil and  gas service industry,  Simmons was  of the view  that the  approach
taken   to  determine,  and  the  assumptions  used  in  respect  of,  potential
consolidation cost  savings and  the  improved financial  performance  resulting
therefrom  to the combined  company, including the  assumption of no significant
adverse effect on revenues  of the combined company,  were reasonable under  the
circumstances.

    Following these reports, the Enterra Board of Directors met the next day and
considered  further a potential  merger with Weatherford.  The Board unanimously
authorized management to continue discussions  with Weatherford and to  formally
engage  Simmons to assist Enterra in the  valuation and financial analyses to be
performed, to assist in  negotiation of the Merger  and to advise regarding  the
fairness  from a  financial point  of view of  the proposed  Merger to Enterra's
stockholders.  In  addition,  the  Board  authorized  management  and  Enterra's
financial  and legal advisors to proceed with a review of Weatherford's business
and to  commence  the  preparation  of appropriate  documents.  The  Board  also
appointed a special committee of the Board, consisting of Messrs. Wood, Macaulay
and  Robert L. Parker, Sr.,  to assist management in  connection with the Merger
negotiations.

    At a special meeting of the Weatherford  Board of Directors held on May  11,
1995,  Mr. Burguieres reported on discussions among Messrs. Burguieres, Wood and
Macaulay, including  the  proposed  conversion rate,  and  that  management  was
evaluating  a potential merger with Enterra. Prior to the meeting, the directors
received the materials prepared by Simmons that were distributed to the  Enterra
Board.  Seven of  Weatherford's eight directors  were present at  the meeting in
person or  participated  by  telephone conference.  Representatives  of  Simmons
attended  part of the meeting  to present a brief  report to the Board comparing
Enterra and  Weatherford,  analyzing  the recent  performance  and  current  and
historical  market valuations  of both  companies and  summarizing the potential
consolidation cost savings and the potential benefits thereof referred to above.
Representatives of Merrill Lynch also were in attendance and met separately with
the Weatherford Board of Directors after Simmons had completed its presentation.
Following these reports, the directors present unanimously authorized management
to continue discussions  with Enterra and  to formally engage  Merrill Lynch  to
assist  Weatherford in the valuation and  financial analyses to be performed, to
assist in negotiation of the Merger and to advise regarding the fairness from  a
financial point of view of the proposed conversion rate to be used in the Merger
to  Weatherford's stockholders. In addition, the Board authorized management and
Weatherford's financial and legal advisors to proceed with a review of Enterra's
business and to commence the preparation of appropriate documents.

    On May 11, 1995, Weatherford formally engaged Merrill Lynch as its financial
advisor in connection with the Merger. On May 12, 1995, Enterra formally engaged
Simmons as its financial advisor in connection with the Merger. Weatherford  and
Enterra  executed a mutual confidentiality agreement on May 12, 1995 relating to
the exchange of  confidential information by  the two companies  and to  certain
other   matters.  Members   of  Weatherford's  and   Enterra's  managements  and
representatives  of  Merrill  Lynch  and  Simmons  met  on  May  16,  1995   for
presentations by each company to the other company and its financial advisor.

    Management  of  Weatherford  reported  on the  status  of  negotiations with
Enterra at a special meeting of the  Weatherford Board of Directors held on  May
18,  1995 and at the annual  meeting of the Board held  on May 19, 1995. Merrill
Lynch made  a presentation  to the  Board concerning  Enterra and  reviewed  the
merger  terms being discussed by Weatherford and Enterra. Following this report,
the

                                       25
<PAGE>
Board authorized management  to continue negotiations  with Enterra regarding  a
merger of the companies. In addition, the Board appointed a special committee of
the  Board, consisting of Mr. Burguieres, Thomas N. Amonett and Robert K. Moses,
Jr., to assist management in connection with the Merger negotiations.

    During May and June, numerous meetings took place between representatives of
Weatherford, representatives of Merrill Lynch and Weatherford's legal  advisors,
on  the one hand, and representatives of Enterra, representatives of Simmons and
Enterra's legal advisors,  on the other  hand, to conduct  due diligence and  to
negotiate  the terms  of the  Merger Agreement,  including whether  the proposed
conversion rate was appropriate and whether such rate should be fixed or  should
fluctuate  based upon the value of the  Weatherford Common Stock and the Enterra
Common Stock  immediately prior  to the  Effective Time.  Discussions were  held
during this period among Messrs. Burguieres, Wood and Macaulay regarding certain
terms  of the  proposed Merger. In  addition, members of  the respective special
committees of each company's Board of Directors had numerous discussions  during
May and June and reported to members of their respective Board of Directors on a
regular  basis. On May  24, 1995, members  of the two  special committees met in
person to discuss various issues related to the Merger.

    At a special meeting of the Weatherford Board of Directors held on June  19,
1995,  Weatherford's management  and representatives  of Merrill  Lynch reviewed
with the Board the business and  financial background information in respect  of
Enterra  and the  opportunities presented  by a  merger with  Enterra. They also
discussed the  status  of  the  negotiations,  including  whether  the  proposed
conversion  rate was appropriate and whether such rate should be fixed or should
fluctuate. Mr. Burguieres advised  the Board that  the proposed conversion  rate
was  supported by a number of different  factors, including, but not limited to,
(i) the financial condition and results of operations of Enterra and Weatherford
on a stand-alone and combined  basis, both historically and prospectively,  (ii)
the  historical  stock price  and trading  relationship between  the Weatherford
Common Stock and the Enterra Common Stock and (iii) certain long-term  strategic
benefits,  both  operational and  financial, of  such  a merger.  Following this
review and  lengthy  discussion, the  Board  authorized management  to  continue
negotiations  with Enterra. Merrill Lynch also  advised the Weatherford Board of
Directors that in excess of 100 million shares of Weatherford Common Stock would
be outstanding after consummation  of the Merger, without  giving effect to  the
Reverse  Stock  Split. Merrill  Lynch  recommended that  Weatherford  effect the
Reverse Stock Split based  upon its judgment  that a decrease  in the number  of
shares of Weatherford Common Stock outstanding and the resulting increase in the
per  share  market  price  should enhance  the  trading  characteristics  of the
Weatherford  Common  Stock.  See  "Proposal  to  Amend  Weatherford's   Restated
Certificate of Incorporation".

    Negotiations  continued among Messrs. Burguieres,  Wood, Macaulay and Parker
to finalize  various  terms of  the  proposed Merger.  Weatherford  and  Enterra
representatives, representatives of Merrill Lynch and Simmons and legal advisors
of  Weatherford and Enterra  continued due diligence and  the negotiation of the
Merger Agreement, including whether the proposed conversion rate was appropriate
and whether such rate should be fixed or should fluctuate.

    On June 23, 1995,  the Enterra Board  of Directors met  to review the  final
terms of the proposed Merger as set forth in the Merger Agreement and to receive
a valuation analysis and oral fairness opinion by Simmons. Nine of Enterra's ten
directors  at that time participated in the  meeting, including two who were not
able to be  present in  person but  participated by  telephone conference  call.
Prior  to the meeting, materials regarding  the proposed Merger were distributed
to the directors, including  the most recent draft  of the Merger Agreement  and
the  related exhibits and  disclosure letters thereto  and materials prepared by
management of Enterra and  Simmons. At the meeting,  Simmons presented its  oral
opinion,  subsequently confirmed in  writing, that, as of  the date thereof, the
consideration to  be received  by the  holders of  Enterra Common  Stock in  the
Merger was fair from a financial point of view to such holders. See "-- Opinions
of Financial Advisors -- Enterra". The Enterra Board approved the Merger and the
Merger  Agreement, except  that Mr. Wood  abstained from voting  with respect to
compensation matters relating  to him  and the Enterra  directors designated  by

                                       26
<PAGE>
certain  of the First  Reserve Funds abstained  from voting with  respect to the
agreements with  the First  Reserve Funds  referred to  in "General  Information
About the Meeting -- Vote Required -- Enterra".

    On  June 23,  1995, the  Weatherford Board  of Directors  met to  review the
financial terms of the proposed Merger as set forth in the Merger Agreement  and
to  receive an  oral fairness opinion  by Merrill Lynch.  Seven of Weatherford's
eight directors were present at the meeting, and unanimously approved the Merger
and the Merger Agreement, except that Mr. Burguieres abstained from voting  with
respect  to matters relating to him. Prior to the meeting, the most recent draft
of the Merger Agreement and the related exhibits and disclosure letters  thereto
were  distributed to the directors. At  the meeting, Merrill Lynch presented its
oral opinion, subsequently confirmed in writing,  that, as of the date  thereof,
the  conversion  rate to  be  used in  the  Merger was  fair  to the  holders of
Weatherford Common Stock  from a financial  point of view.  See "-- Opinions  of
Financial Advisors -- Weatherford".

    The  Merger Agreement was executed and delivered on behalf of both companies
late on Friday, June 23, 1995, and  an announcement thereof was released to  the
public before the NYSE opened on Monday, June 26, 1995.

    During  May and June,  Enterra, Weatherford, the  First Reserve Funds, which
collectively own approximately 40% of  the outstanding shares of Enterra  Common
Stock,  and First Reserve, which manages the First Reserve Funds, negotiated the
terms of the  Stockholders Agreement  and the  agreements of  the First  Reserve
Funds  and First Reserve to  vote the shares of  Enterra Common Stock over which
they and  their affiliates  have voting  control in  favor of,  or against,  the
Merger  Agreement  depending upon  the recommendation  of  the Enterra  Board of
Directors. On June 23, 1995, Enterra,  Weatherford, the First Reserve Funds  and
First  Reserve signed such  agreements. See "-- Interests  of Certain Persons in
the Merger" and "Terms of the Merger -- Stockholders Agreement".

    On August 28, 1995, the Merger Agreement and the Stockholders Agreement were
amended, principally to correct typographical errors.

    On  the  date  of  this  Joint  Proxy  Statement/Prospectus,  Merrill  Lynch
confirmed  to Weatherford in writing that as of such date the conversion rate to
be used in the Merger is fair to the holders of Weatherford Common Stock from  a
financial point of view, and Simmons reaffirmed to Enterra in writing that as of
such  date the  consideration to  be received by  the holders  of Enterra Common
Stock in the Merger is fair from a financial point of view to such holders.

    Certain members  of  management  of Weatherford  and  Enterra  have  special
interests  in  connection  with the  consummation  of  the Merger  that  are not
identical to those of unaffiliated Weatherford and Enterra stockholders. See "--
Interests of Certain Persons in the Merger".

JOINT REASONS FOR THE MERGER

    Weatherford and  Enterra  provide  products  and services  to  oil  and  gas
operators  for use in oil and gas exploration and development, primarily for the
drilling, production and workover of oil  and natural gas wells. Both  companies
provide  specialized rental  and fishing  tools in  virtually every  oil and gas
exploration and  production  region  in  the  world.  In  addition,  Weatherford
provides  tubular  running  services  and  manufactures  and  sells  cementation
products and other equipment, and Enterra provides gas compression services  and
equipment  and pipeline services and equipment and manufactures gas lift systems
and downhole  drilling  tools.  Through  a series  of  recent  acquisitions  and
expansions,  each  of  Weatherford  and Enterra  has  undertaken  a  strategy of
offering a broader mix  of services and products  in domestic and  international
markets.

    Managements  of both Weatherford and Enterra anticipate that the Merger will
result in significant consolidation cost  savings, through a rationalization  of
the  cost and overhead  structures of the combined  company. Managements of both
companies, with  Simmons' assistance,  initially estimated  these  consolidation
cost  savings to be at least $26.8  million per year, exclusive of certain other

                                       27
<PAGE>
potential consolidation cost savings that were still under review. In  addition,
managements  of Weatherford  and Enterra  believe that  the Merger  will provide
opportunities for the  combined company  to offer  additional and  complementary
products  and services to their existing  and prospective customers, and thereby
provide a broader package of products and services to the oil and gas industry.

    Managements of both Weatherford and Enterra also believe that by merging  in
a  stock-for-stock transaction, the combined company will continue to maintain a
strong balance sheet, which  both companies believe is  and will continue to  be
important  in this  industry. On  a pro forma  basis, as  of June  30, 1995, the
combined company will  have outstanding long-term  debt of approximately  $203.4
million,  compared to pro  forma combined stockholders'  equity of approximately
$748.0 million. Managements of both Weatherford and Enterra also anticipate that
the combined  pro  forma  post-merger market  capitalization  will  exceed  $1.0
billion   and  will  make   the  combined  company  one   of  the  largest  U.S.
publicly-traded energy  service companies.  They anticipate  that the  increased
size  may lower financing costs  as a result of  improved financial strength and
that the larger capitalization base could  be attractive to a greater number  of
institutional  investors. Furthermore, based on  historical data, managements of
both companies believe that the larger capitalization could lead to the prospect
of enhanced price earnings and cash flow multiples.

    Managements of both Weatherford and  Enterra recognize that the Merger  will
continue each company's respective focus in the oil and gas industry, which will
continue  to expose the combined company to the short-term and long-term impacts
of  volatile  oil  and  gas  prices.  See  "Special  Considerations  --  Special
Considerations  with Respect  to the  Combined Company  -- Industry Volatility".
However, both managements believe that such risks are reasonable in light of the
potential benefits and do  not represent a significant  change from the  current
risk exposures of the separate companies.

WEATHERFORD'S REASONS FOR THE MERGER

    The Weatherford Board of Directors believes that the terms of the Merger are
fair  to, and in the best interests  of, the stockholders of Weatherford. In the
course of  its deliberations  with respect  to approval  of the  Merger and  the
Merger  Agreement, the  Weatherford Board  of Directors  received the  advice of
management and Merrill Lynch  regarding Enterra's businesses  and the advice  of
management,  legal counsel and Merrill Lynch  regarding the terms and provisions
of the Merger  Agreement. Substantial  consideration was given  to the  internal
analyses  prepared by  management, the  analyses prepared  and presented  to the
Board by Merrill Lynch and the opinion of Merrill Lynch. In addition, the  Board
considered a number of factors, including:

    (i) an  analysis of the financial  performance, operations, assets, business
        condition and business prospects  of Weatherford and Enterra,  including
        Enterra's projected financial performance for the second quarter of 1995
        and   the  remainder  of  1995  and  Weatherford's  projected  financial
        performance for the remainder of 1995;

    (ii) a review of the pro forma internal projections for the combined  entity
         prepared  by  Weatherford  management  and  other  internal evaluations
         prepared by Weatherford management;

   (iii) the terms of the Merger Agreement;

   (iv) the presentations and the advice of, and materials prepared by,  Merrill
        Lynch  and  the  opinion  of  Merrill  Lynch,  as  financial  advisor to
        Weatherford, that, as of the date  of such opinion, the conversion  rate
        to  be used in the Merger was  fair to the holders of Weatherford Common
        Stock from a  financial point  of view  (see "--  Opinions of  Financial
        Advisors -- Weatherford");

    (v) an  analysis  of the  opportunities  for significant  consolidation cost
        savings anticipated to be recognized as a result of the Merger;

   (vi) an analysis of the  potential business synergies to  be achieved by  the
        blending  of relative  strengths of  the two  companies, particularly in
        respect of customer base, geographic areas and operational strengths;

                                       28
<PAGE>
   (vii) an analysis  of the  increased  competitiveness produced  by  combining
         underperforming operations;

  (viii) an  analysis of the projected accretion  in earnings and cash flow with
         respect to the combined company  resulting from the consolidation  cost
         savings anticipated by the Merger;

   (ix) a review of the sources of Enterra's revenues, with emphasis on revenues
        from  pipeline services and equipment  business and compression services
        and equipment  business,  as  they represent  new  principal  or  "core"
        businesses to Weatherford; and

    (x) the  belief  that  the increased  size  of the  combined  company should
        provide increased market  float, expanded analyst  coverage and  greater
        investor interest.

The  Weatherford Board of Directors did not attach specific weight to any of the
foregoing factors in reaching  its conclusion that the  terms of the Merger  are
fair  to, and in the best interests of, the stockholders of Weatherford. See "--
Opinions of Financial Advisors -- Weatherford" for a discussion of the  analysis
performed by Merrill Lynch in connection with rendering its opinion and terms of
Weatherford's agreement to engage, compensate and indemnify Merrill Lynch.

RECOMMENDATION OF THE WEATHERFORD BOARD OF DIRECTORS

    For  the reasons set forth under "--  Background", "-- Joint Reasons for the
Merger" and "-- Weatherford's Reasons for the Merger", the Weatherford Board  of
Directors  believes that the  terms of the Merger  are fair to,  and in the best
interests of,  Weatherford and  the  holders of  Weatherford Common  Stock.  The
Weatherford  Board of Directors has approved the Merger and the Merger Agreement
and has recommended  that the  holders of  Weatherford Common  Stock vote  "for"
adoption and approval of the Merger and the Merger Agreement.

    In  analyzing the Merger and the  Merger Agreement, the Weatherford Board of
Directors was assisted and advised by Merrill  Lynch, and, at the June 23,  1995
special  meeting, the Weatherford  Board received an  oral opinion, subsequently
confirmed in writing, from Merrill Lynch that,  as of the date of such  opinion,
the conversion rate to be used in the Merger was fair, from a financial point of
view,  to the holders of Weatherford Common Stock. See "-- Opinions of Financial
Advisors -- Weatherford". This opinion was confirmed in writing by Merrill Lynch
as of the date of this Joint Proxy Statement/Prospectus.

ENTERRA'S REASONS FOR THE MERGER

    The Enterra Board  of Directors believes  that the terms  of the Merger  are
fair  to, and  in the  best interests  of, the  stockholders of  Enterra. In the
course of  its deliberations  with respect  to approval  of the  Merger and  the
Merger  Agreement,  the  Enterra  Board  of  Directors  received  the  advice of
management and  Simmons  regarding  Weatherford's business  and  the  advice  of
management,  legal counsel and Simmons regarding the terms and provisions of the
Merger Agreement. Substantial consideration was  given to the internal  analyses
prepared  by management,  the analyses  prepared and  presented to  the Board by
Simmons and the opinion of Simmons.  In addition, the Board considered a  number
of other factors, including:

    (i) an  analysis of the financial  performance, operations, assets, business
        condition and business prospects  of Weatherford and Enterra,  including
        Enterra's projected financial performance for the second quarter of 1995
        and   the  remainder  of  1995  and  Weatherford's  projected  financial
        performance for the remainder of 1995;

    (ii) a review  of pro  forma internal  projections for  the combined  entity
         prepared  by Enterra management and other internal evaluations prepared
         by Enterra management;

   (iii) the terms of the Merger Agreement;

                                       29
<PAGE>
   (iv) the  presentations and the advice of, and materials prepared by, Simmons
        and the opinion of Simmons, as financial advisor to Enterra, that, as of
        the date  of such  opinion,  the consideration  to  be received  by  the
        stockholders of Enterra in the Merger was fair from a financial point of
        view  to such  stockholders (see "--  Opinions of  Financial Advisors --
        Enterra");

    (v) an analysis  of the  opportunities  for significant  consolidation  cost
        savings anticipated as a result of the Merger;

   (vi) an  analysis of the  potential business synergies to  be achieved by the
        blending of relative  strengths of  the two  companies, particularly  in
        respect of customer base, geographic areas and operational strengths;

   (vii) an  analysis  of the  increased  competitiveness produced  by combining
         underperforming operations;

  (viii) an analysis of the projected accretion  in earnings and cash flow  with
         respect  to the combined company  resulting from the consolidation cost
         savings anticipated by the Merger;

   (ix) a review by the non-management directors of Enterra of the strengths and
        weaknesses  of  Enterra's  current  senior  management  and  the  senior
        management of Weatherford; and

    (x) the  belief  that  the increased  size  of the  combined  company should
        provide increased market  float, expanded analyst  coverage and  greater
        investor interest.

The  Enterra Board  of Directors did  not attach  specific weight to  any of the
foregoing factors in reaching  its conclusion that the  terms of the Merger  are
fair  to, and  in the best  interests of,  the stockholders of  Enterra. See "--
Opinions of Financial  Advisors --  Enterra" for  a discussion  of the  analysis
performed  by  Simmons in  connection with  rendering its  opinion and  terms of
Enterra's agreement to engage, compensate and indemnify Simmons.

RECOMMENDATION OF THE ENTERRA BOARD OF DIRECTORS

    For the reasons set forth under  "-- Background", "-- Joint Reasons for  the
Merger"  and  "--  Enterra's  Reasons  for the  Merger",  the  Enterra  Board of
Directors believes that the  terms of the  Merger are fair to,  and in the  best
interests  of, Enterra  and the  holders of Enterra  Common Stock.  The Board of
Directors has approved the Merger and  the Merger Agreement and has  recommended
that the holders of Enterra Common Stock vote "for" adoption and approval of the
Merger and the Merger Agreement.

    In  analyzing  the Merger  and the  Merger Agreement,  the Enterra  Board of
Directors was  assisted  and advised  by  Simmons, and,  at  the June  23,  1995
meeting,  the Enterra Board received an  oral opinion, subsequently confirmed in
writing, from Simmons that, as of the date of such opinion, the consideration to
be received by the holders of Enterra Common Stock in the Merger was fair from a
financial point of view to such holders. See "-- Opinions of Financial  Advisors
- -- Enterra". This opinion was reaffirmed in writing by Simmons as of the date of
this Joint Proxy Statement/ Prospectus.

OPINIONS OF FINANCIAL ADVISORS

    WEATHERFORD

    At  its meeting on June  23, 1995 to consider and  vote on entering into the
Merger Agreement, the Weatherford Board  of Directors received the oral  opinion
of  Merrill Lynch that, as of  such date, the conversion rate  to be used in the
Merger was fair  to the  holders of Weatherford  Common Stock  from a  financial
point  of  view.  Such opinion  was  subsequently  confirmed in  writing  to the
Weatherford Board  of Directors  as of  June  23, 1995  and again  confirmed  in
writing as of the date of this Joint Proxy Statement/Prospectus. Merrill Lynch's
opinion  relates  only  to  the  conversion  rate  and  does  not  constitute  a
recommendation to  any stockholder  of Weatherford  as to  how such  stockholder
should vote at the Weatherford Special Meeting. The full text of Merrill Lynch's
June 23, 1995 written opinion, which summarizes the assumptions made, procedures
followed and matters considered in

                                       30
<PAGE>
connection  with such  opinion, is  attached as Appendix  B to  this Joint Proxy
Statement/Prospectus and is  incorporated herein by  reference. STOCKHOLDERS  OF
WEATHERFORD  AND  ENTERRA  ARE  URGED  TO  READ  THE  OPINION  IN  ITS ENTIRETY,
ESPECIALLY WITH REGARD TO THE ASSUMPTIONS MADE AND MATTERS CONSIDERED BY MERRILL
LYNCH.

    In connection with rendering  its opinion on June  23, 1995, Merrill  Lynch,
among  other  things:  (i) reviewed  Enterra's  Annual Reports,  Forms  10-K and
related financial information for the three fiscal years ended December 31, 1994
and its  Form 10-Q  and  the related  unaudited  financial information  for  the
quarterly  period  ended  March  31, 1995;  (ii)  reviewed  Weatherford's Annual
Reports, Forms 10-K and related financial information for the three fiscal years
ended December 31, 1994  and its Form 10-Q  and the related unaudited  financial
information  for  the  quarterly period  ended  March 31,  1995;  (iii) reviewed
certain information, including  financial forecasts, relating  to the  business,
earnings,  cash  flow,  assets  and prospects  of  Enterra  and  of Weatherford,
furnished to Merrill Lynch by  Enterra and Weatherford, respectively,  including
projected  results of operations  for each company  for each of  the quarters in
1995; (iv) conducted discussions  with members of  senior management of  Enterra
and  Weatherford  concerning  their  respective  businesses  and  prospects; (v)
reviewed the historical  market prices and  trading activity for  the shares  of
common  stock of  each of  Enterra and Weatherford  and compared  them with each
other and with that of certain publicly-traded companies Merrill Lynch deemed to
be reasonably similar to Enterra and  Weatherford; (vi) compared the results  of
operations  of Enterra and Weatherford with each  other and with that of certain
companies  Merrill  Lynch  deemed  to  be  reasonably  similar  to  Enterra  and
Weatherford;  (vii) compared  the proposed  financial terms  of the transactions
contemplated by the Merger Agreement with  the financial terms of certain  other
mergers  and acquisitions Merrill Lynch deemed to be relevant; (viii) considered
the pro forma effect  of the Merger on  Weatherford's capitalization ratios  and
earnings,  cash  flow  and  earnings  before  depreciation,  interest  and taxes
("EBDIT") per share; (ix)  reviewed a draft of  the Merger Agreement dated  June
23,  1995;  and  (x) reviewed  such  other  financial studies  and  analyses and
performed such other investigations and took into account such other matters  as
Merrill Lynch deemed necessary.

    In connection with orally advising the Weatherford Board of Directors of its
opinion  on June 23, 1995,  confirming its opinion in  writing and preparing its
presentations to the Weatherford  Board of Directors on  June 23, 1995,  Merrill
Lynch performed a variety of financial and comparative analyses, including those
described  below.  The  preparation  of  a  fairness  opinion  involves  various
determinations as  to the  most appropriate  and relevant  methods of  financial
analysis  and the application of these  methods to the particular circumstances.
Consequently, the analysis underlying such an opinion is not readily susceptible
to summary  description. In  arriving  at its  opinion,  Merrill Lynch  did  not
attribute any particular weight to any analysis or factors considered by it, but
rather  made qualitative judgments as to  the significance and relevance of each
analysis and factor. Accordingly, Merrill Lynch believes that its analyses  must
be  considered as a whole and that  considering any portions of such analysis or
such factors  without  considering all  analyses  and factors  could  create  an
incomplete  or  misleading  view of  the  process Merrill  Lynch  undertook with
respect to rendering its opinion. In  its analysis, Merrill Lynch made  numerous
assumptions  with respect to general  business and economic conditions, industry
performance and other matters, many  of which are beyond Weatherford's  control.
Any  estimates contained  in these  analyses are  not necessarily  indicative of
actual  values  or  predictive  of  future  results  or  values,  which  may  be
significantly  more or  less favorable than  as set forth  therein. In addition,
analyses relating to the value of businesses or securities do not purport to  be
appraisals  or to reflect the prices  at which businesses or securities actually
may trade or be acquired or sold.

    The following summary does not purport  to be a complete description of  the
presentations  made, or opinion rendered, to  the Weatherford Board of Directors
on June 23, 1995  or of the  analyses performed by  Merrill Lynch in  connection
with the Merger.

                                       31
<PAGE>
    DISCOUNTED  CASH FLOW ANALYSIS.  Utilizing  a discounted cash flow analysis,
Merrill Lynch, utilizing certain  data provided by  Weatherford and Enterra  and
certain  other assumptions, estimated the present  value of the future unlevered
free cash  flows that  Weatherford and  Enterra could  be expected  to  generate
during the period from January 1, 1995 to December 31, 1999.

    With respect to the information provided by Enterra and Weatherford, Merrill
Lynch  assumed that such information was reasonably prepared based upon the best
available estimates and judgments of each respective management. In  conjunction
with  Weatherford, Merrill Lynch  utilized the information  provided and various
assumptions on rig activity, margins, operating expenses, inflation and  capital
expenditures  to project financial  results for Weatherford  and Enterra through
the year 1999. The estimated future unlevered free cash flows were discounted at
after-tax rates of 11.0% to 14.0%, and  a terminal multiple of 6.0x was  applied
to the estimated EBDIT for each respective company in 1999 and discounted at the
same  after-tax rates of 11.0% to 14.0%,  which provided a reference value range
for the Enterra Common Stock of $391.8  million to $459.4 million, or $14.14  to
$16.59  per share, and a reference value  range for the Weatherford Common Stock
of $487.8 million to  $559.3 million, or  $8.98 to $10.29  per share. Using  the
respective per share values for Enterra and Weatherford, the reference range for
the  conversion rate  was calculated  to be 1.57  to 1.61  shares of Weatherford
Common Stock for each share of Enterra Common Stock (before giving effect to the
Reverse Stock Split).

    PURCHASE PRICE ANALYSIS AND STOCK TRADING HISTORY.  Merrill Lynch  performed
an  analysis which indicated that pursuant to the terms of the Merger Agreement,
holders of Enterra Common Stock would own approximately 46.5% of the outstanding
shares of  Weatherford Common  Stock following  the Merger.  Merrill Lynch  also
examined  the history  of trading prices  and volume for  the Weatherford Common
Stock and the Enterra  Common Stock and various  historical ratios between  such
common stocks. Based upon the average closing prices of the Enterra Common Stock
and  Weatherford Common Stock for selected  periods of time, the reference range
for the conversion rate was calculated to be 1.60 to 2.50 shares of  Weatherford
Common Stock for each share of Enterra Common Stock (before giving effect to the
Reverse Stock Split).

    CONTRIBUTION  ANALYSES.  Merrill  Lynch analyzed the  projected earnings and
cash flow per share (defined as  net income plus depreciation, amortization  and
provision for deferred taxes divided by shares outstanding) for both Weatherford
and  Enterra. Merrill Lynch also adjusted  the respective earnings and cash flow
per  share  to  reflect  certain  accounting  differences  (including   goodwill
amortization and non-recurring expenses) and differences in effective tax rates.
Using the respective projected earnings and cash flow per share contributions of
Weatherford  and  Enterra,  a  reference  range  for  the  conversion  rate  was
calculated. Based upon the unadjusted projected earnings per share contributions
of the respective  companies, the reference  range for the  conversion rate  was
calculated  to be 1.10 to 1.39 shares of Weatherford Common Stock for each share
of Enterra Common Stock (before giving effect to the Reverse Stock Split). Based
upon the adjusted projected earnings  per share contributions of the  respective
companies, the reference range for the conversion rate was calculated to be 1.47
to  1.59 shares  of Weatherford  Common Stock for  each share  of Enterra Common
Stock (before  giving  effect  to  the Reverse  Stock  Split).  Based  upon  the
unadjusted  projected  cash  flow  per  share  contributions  of  the respective
companies, the reference range for the conversion rate was calculated to be 1.72
to 1.85 shares  of Weatherford  Common Stock for  each share  of Enterra  Common
Stock (before giving effect to the Reverse Stock Split). Based upon the adjusted
projected  cash flow  per share contributions  of the  respective companies, the
reference range for the conversion rate was calculated to be 1.81 to 1.85 shares
of Weatherford  Common Stock  for each  share of  Enterra Common  Stock  (before
giving effect to the Reverse Stock Split).

    PRO FORMA MERGER ANALYSIS.  Merrill Lynch analyzed certain pro forma effects
that  could result from the  Merger. This analysis indicated  that the pro forma
net income and  EBDIT per share  (excluding one-time costs  associated with  the
Merger)  of the combined company would be accretive in 1995 and 1996 as compared
to the comparable  stand-alone projections for  Weatherford. In considering  the
pro  forma  impact, Merrill  Lynch assumed  the  realization of  expected annual
pre-tax consolidation

                                       32
<PAGE>
benefits of  $27 million.  Merrill  Lynch expressed  no  view on  whether  these
savings could be obtained. Merrill Lynch also analyzed the effects of the Merger
on  the balance sheet of the combined  company. The combined company's pro forma
debt-to-debt plus common  equity ratio  as of March  31, 1995  for the  combined
company was 20.9% as compared to 19.4% for Weatherford on a stand-alone basis.

    In  evaluating the fairness of the conversion rate to be used in the Merger,
Merrill Lynch also considered certain other analyses that are set forth below.

    ANALYSES OF SELECTED  PUBLICLY-TRADED COMPARABLE COMPANIES.   Merrill  Lynch
compared  selected historical stock, operating and  financial ratios for each of
Weatherford and  Enterra to  the  respective corresponding  data and  ratios  of
certain  similar publicly-traded companies. With respect to both Weatherford and
Enterra, Merrill Lynch made such comparisons to two categories of companies: (i)
certain  large-sized  capitalization  companies,  consisting  of  Baker   Hughes
Incorporated,  Dresser Industries,  Inc., Halliburton  Co., Schlumberger Limited
and Western Atlas,  Inc.; and (ii)  certain mid-sized capitalization  companies,
consisting   of   BJ  Services   Company,   Camco  International,   Inc.,  Smith
International,  Inc.,  Tuboscope  Vetco  International  Corporation  and   Varco
International,  Inc. For  purposes of  this analysis,  data with  respect to the
companies were derived  from certain publicly  available information  concerning
estimates  of future  operating and  financial performance  of the  companies as
prepared by certain equity research analysts.

    An analysis of the ratio of adjusted market capitalization (defined as  debt
plus market value of common stock plus liquidation value of preferred stock plus
minority  interests less cash and marketable  securities) to projected EBDIT for
1995 yielded a range of 6.8x to 8.8x with an average of 7.8x for the large-sized
capitalization company group and a range of 5.7x to 8.8x with an average of 7.8x
for the mid-sized capitalization company group, compared to a ratio of  adjusted
market  capitalization to projected EBDIT in 1995 for Weatherford and Enterra of
7.2x and 7.2x, respectively; and for 1996  yielded a range of 6.3x to 8.6x  with
an  average of 7.3x for the large-sized capitalization company group and a range
of 5.1x to 7.6x with an average of 6.8x for the mid-sized capitalization company
group, compared to a ratio of adjusted market capitalization to projected  EBDIT
in 1996 for Weatherford and Enterra of 6.7x and 6.3x, respectively.

    An  analysis of the ratio  of the market value  of common stock to projected
net income for 1995 yielded a range of  19.3x to 27.3x with an average of  23.5x
for  the large-sized capitalization company group and  a range of 13.0x to 24.9x
with an  average  of  19.1x  for the  mid-sized  capitalization  company  group,
compared  to a ratio of market value of  common stock to projected net income in
1995 for Weatherford and Enterra of 17.6x and 25.7x, respectively; and for  1996
yielded  a range of 16.6x to 22.3x with  an average of 20.0x for the large-sized
capitalization company group and  a range of  9.5x to 17.5x  with an average  of
14.9x  for the  mid-sized capitalization company  group, compared to  a ratio of
market value of common stock to projected net income in 1996 for Weatherford and
Enterra of 18.8x and 21.6x, respectively.

    Because of the inherent differences  between the operations of  Weatherford,
Enterra  and the  selected comparable companies,  Merrill Lynch  believed that a
purely  quantitative  comparable  company  analysis  would  not  be  exclusively
dispositive  in  the  context of  the  Merger.  Merrill Lynch  believed  that an
appropriate use of a comparable company analysis in this instance would  involve
qualitative judgments concerning differences between the financial and operating
characteristics  of  Weatherford,  Enterra  and  the  selected  companies, which
judgments are reflected in Merrill Lynch's opinion.

    ANALYSES OF  SELECTED COMPARABLE  ACQUISITION TRANSACTIONS.   Merrill  Lynch
also reviewed publicly available information on certain acquisition transactions
that  involved  companies with  primarily U.S.  operations and  consideration in
excess of $50 million in the oilfield service industry, which took place between
November 1989 and May 1995. The acquisitions considered by Merrill Lynch include
(in order from May 1995 to November 1989 and listed by the acquiror/seller);  BJ
Services/Western Company; Eagleville Ltd./Fairhaven International;
Tidewater/Halliburton Compression; Enterra/

                                       33
<PAGE>
Total   Energy  Services;  Dresser   Industries/Wheatley  TXT;  Nabors/Sundowner
Offshore;   Dresser    Industries/Baroid;    Weatherford/Homco    International;
Halliburton/Smith    Directional    Drilling;    Baroid    Corporation/Sub   Sea
International;  Baker  Hughes/Teleco  Oilfield  Services;  Baker  Hughes/Eastman
Christensen; and Cooper Industries/Cameron Iron Works.

    Merrill Lynch examined the multiples of the total consideration paid in each
of   the  transactions  to,  among  other  measures,  such  acquired  companies'
respective EBDIT for the  latest reported twelve month  period, which yielded  a
range  of 8.0x to 16.1x with an average of 10.5x compared to a ratio of adjusted
market capitalization (which  for purposes of  this analysis was  assumed to  be
equivalent  to total consideration) to EBDIT  for the latest twelve month period
for Weatherford and Enterra of 8.1x and 8.4x, respectively.

    Because  the  reasons  for,  and  circumstances  surrounding,  each  of  the
transactions  analyzed  were  so diverse  and  due to  the  inherent differences
between the  operations  of Weatherford,  Enterra  and the  selected  companies,
Merrill  Lynch  believed  that  a  purely  quantitative  comparable  transaction
analysis would not  be exclusively dispositive  in the context  of the  proposed
Merger.  Merrill Lynch further believed that  an appropriate use of a comparable
transaction analysis  in  this  instance  would  involve  qualitative  judgments
concerning differences between the characteristics of these transactions and the
Merger  that would  affect the acquisition  value of the  acquired companies and
businesses and  Enterra,  which  judgments  are  reflected  in  Merrill  Lynch's
opinion.

    In  connection  with rendering  its opinion,  Merrill Lynch  relied, without
independent verification,  upon the  accuracy  and completeness  of all  of  the
financial  and  other  information furnished  to  Merrill Lynch  by  Enterra and
Weatherford. With  respect  to  forecasted financial  information  furnished  to
Merrill  Lynch by Enterra and  Weatherford (including estimates of consolidation
benefits from the Merger), Merrill Lynch  assumed such information to have  been
reasonably  prepared and to  reflect the best  currently available estimates and
judgments of  the managements  of Weatherford  and Enterra  as to  the  expected
future  financial performance of  Weatherford and Enterra,  respectively, and of
the two companies combined. In rendering its opinion, Merrill Lynch did not make
or receive an independent evaluation or  appraisal of the assets or  liabilities
of  Weatherford or Enterra, nor did it  independently verify any of the publicly
available information relating to Weatherford or Enterra. The opinion of Merrill
Lynch is necessarily based  upon market, economic and  other conditions as  they
existed on, and could be evaluated as of, the date of such opinion. In rendering
its  opinion, Merrill  Lynch relied  upon Weatherford  as to  certain accounting
aspects of the Merger and assumed that the Merger will be treated as a  tax-free
reorganization  within the meaning  of Section 368(a)  of the Code  and that the
Merger and  the exchange  of shares  contemplated thereby  will be  treated  for
financial accounting purposes as a "pooling of interests".

    As  described  above,  Merrill  Lynch's  opinion  and  presentations  to the
Weatherford Board  of  Directors  were  one  of  the  many  factors  taken  into
consideration by such Board of Directors in making its determination on June 23,
1995 to approve the Merger and the Merger Agreement.

    Merrill Lynch is an internationally recognized investment banking firm that,
as  part  of  its  investment  banking business,  regularly  is  engaged  in the
evaluation of businesses  and their  securities in connection  with mergers  and
acquisitions,    negotiated    underwritings,   competitive    bids,   secondary
distributions  of  listed  and  unlisted  securities,  private  placements   and
valuations  for  estate,  corporate  and  other  purposes.  Weatherford selected
Merrill Lynch to act as its financial  advisor in connection with the Merger  on
the basis of such firm's expertise.

    In  connection  with  Merrill  Lynch's  services  as  financial  advisor  to
Weatherford, Weatherford has agreed to pay Merrill Lynch as compensation for its
services a fee in the amount of $2 million upon consummation of the Merger  (or,
if  the Merger  is not  consummated, upon  the consummation  of another business
combination within  18  months  following  the retention  of  Merrill  Lynch  as
Weatherford's   financial  advisor).  Weatherford  has   paid  Merrill  Lynch  a
noncontingent fee of  $100,000 that  will be credited  against such  transaction
fee.   Weatherford   also   has   agreed   to   reimburse   Merrill   Lynch  for

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<PAGE>
certain reasonable out-of-pocket expenses incurred in connection with the Merger
and to indemnify Merrill Lynch (and its employees and directors) against certain
liabilities and  expenses  in  connection with  the  Merger,  including  certain
liabilities under the Federal securities laws.

    Merrill Lynch has performed investment banking services for Weatherford from
time  to time. Such services have included, among others, acting as lead-manager
of a  common stock  offering in  April 1993,  for which  Merrill Lynch  received
customary  compensation.  In  addition,  Merrill Lynch  has  from  time  to time
provided financial  advisory  services  to  Weatherford,  but  has  received  no
compensation  therefor except  in connection  with the  Merger. In  the ordinary
course of  Merrill  Lynch's  business,  Merrill Lynch  may  actively  trade  the
securities  of Weatherford and Enterra for its  own account and for the accounts
of its customers and, accordingly, may at any time hold a long or short position
in such securities. Merrill Lynch also has performed investment banking services
for First Reserve  in connection with  an asset divestiture,  for which  Merrill
Lynch received fees of $1.3 million.

    ENTERRA

    Enterra  retained Simmons to act as its financial advisor in connection with
the Merger  and to  render a  fairness opinion  in connection  with the  Merger.
Simmons  rendered an oral opinion to the Enterra Board of Directors at a meeting
on June 23, 1995 that, as of that date, the consideration to be received by  the
holders of Enterra Common Stock in the Merger was fair from a financial point of
view  to such  holders. Such  opinion was reaffirmed  in writing  to the Enterra
Board as of June 23, 1995 and again confirmed in writing as of the date of  this
Joint Proxy Statement/Prospectus.

    The  full text of Simmons' fairness opinion, dated June 23, 1995, which sets
forth the assumptions made, general procedures followed, matters considered  and
limits  on the review undertaken, is attached  as Appendix C to this Joint Proxy
Statement/Prospectus. Simmons' opinion is directed only to the fairness, from  a
financial  point of view, of the consideration  to be received by the holders of
Enterra Common Stock and does not  constitute a recommendation to any holder  of
Enterra  Common  Stock as  to how  such  stockholder should  vote on  the Merger
Agreement. The summary of Simmons' opinion  set forth below is qualified in  its
entirety  by reference to the full text  of such opinion attached as Appendix C.
STOCKHOLDERS OF ENTERRA ARE URGED TO READ THE OPINION IN ITS ENTIRETY.

    In connection with rendering its opinion on June 23, 1995, Simmons  reviewed
and  analyzed, among  other things,  the following:  (i) a  draft of  the Merger
Agreement and related  disclosure letters; (ii)  financial statements and  other
information  concerning Enterra,  including the Annual  Reports on  Form 10-K of
Enterra for the  years ended December  31, 1992 through  1994 and the  Quarterly
Report  on Form  10-Q of  Enterra for  the quarter  ended March  31, 1995; (iii)
certain other internal information, primarily financial in nature and  including
financial forecasts, concerning the business and operations of Enterra furnished
by  Enterra for  purposes of Simmons'  analysis, including  projected results of
operations for each  of the quarters  in 1995; (iv)  certain publicly  available
information concerning the trading of Enterra Common Stock; (v) certain publicly
available  information concerning  Weatherford, including the  Annual Reports on
Form 10-K of Weatherford for the years ended December 31, 1992 through 1994  and
the Quarterly Report on Form 10-Q of Weatherford for the quarter ended March 31,
1995; (vi) certain other internal information, primarily financial in nature and
including  financial  forecasts,  concerning  the  business  and  operations  of
Weatherford  furnished  by  Weatherford  for  purposes  of  Simmons'   analysis,
including  projected results  of operations  for each  of the  quarters in 1995;
(vii)  certain  publicly  available   information  concerning  the  trading   of
Weatherford  Common Stock;  (viii) certain  publicly available  information with
respect to certain  other companies that  Simmons believes to  be comparable  to
Enterra  or  Weatherford  and the  trading  markets  for certain  of  such other
companies'  securities;  and   (ix)  certain   publicly  available   information
concerning  the  nature  and  terms  of  certain  other  transactions considered
relevant to the inquiry. Simmons also met with certain officers and employees of
Enterra and  Weatherford to  discuss  the foregoing  as  well as  other  matters
believed by Simmons to be relevant.

    In   arriving  at  its  June  23,   1995  opinion  and  making  its  related
presentations, Simmons assumed and relied upon the accuracy and completeness  of
all of the financial and other information provided

                                       35
<PAGE>
by  Enterra and Weatherford, or publicly available, including without limitation
information with  respect  to  condition of  assets,  tax  positions,  liability
reserves  and insurance coverages,  and did not  attempt independently to verify
any such information.  With respect to  the financial forecasts  and other  data
reviewed  by Simmons, Simmons assumed, with the  consent of the Enterra Board of
Directors, that  such forecasts  and  other data  were reasonably  prepared  and
reflected the best currently available estimates and judgments of the respective
managements  of  Enterra and  Weatherford as  to  the expected  future financial
performance of their respective companies and of the combined company  following
the  Merger. Simmons also relied upon  an estimate of consolidation cost savings
that was prepared  by managements  of both companies  with Simmons'  assistance,
which  indicated that consolidation cost savings of $26.8 million annually could
be achieved, exclusive  of certain  other potential  consolidation cost  savings
that  were still  under review.  Simmons reviewed  the calculation  of potential
consolidation  cost  savings  prepared  by  managements  of  the  companies  and
determined,  in view of  the exclusion of such  potential additional savings, to
assume annual consolidation  cost savings  of $30  million for  purposes of  its
analysis.  Simmons did not conduct  a physical inspection of  any of the assets,
properties or  facilities  of  Enterra,  nor did  Simmons  make  or  obtain  any
independent  evaluations  or  appraisal of  any  of such  assets,  properties or
facilities. Simmons assumed that  the Merger would be  treated as a "pooling  of
interests"  for accounting purposes and as a tax-free reorganization for Federal
income tax purposes. In  addition, although Simmons  discussed the prospects  of
Enterra  and  Weatherford  with  certain  representatives  of  their  respective
managements, Simmons was  only provided with  financial projections for  Enterra
through  1999 and for  Weatherford through 1995,  together with related analyses
for the same periods prepared by  managements of both companies with respect  to
their respective future performances.

    In  conducting  its analysis  and  arriving at  its  June 23,  1995 opinion,
Simmons considered such  financial and  other factors as  it deemed  appropriate
under  the  circumstances  including,  among  others,  the  following:  (i)  the
historical and current financial position  and results of operations of  Enterra
and  Weatherford (including an in-depth review  of projected second quarter 1995
and full year 1995 results for  both companies); (ii) the business prospects  of
Enterra  and Weatherford presented  by managements of  both companies; (iii) the
potential personnel and operating expense  reductions that could be achieved  in
the Merger; and (iv) the historical and current market for Enterra Common Stock,
for  Weatherford Common  Stock and  for the  equity securities  of certain other
companies believed  by  Simmons to  be  comparable to  Enterra  or  Weatherford.
Simmons  also took into  account its assessment of  general economic, market and
financial conditions and its experience in connection with similar  transactions
and  securities' valuation generally. Simmons' opinion necessarily is based upon
conditions as they  existed and could  be evaluated on,  and on the  information
made available at, the date of such opinion.

    In  connection with a  presentation to the  Enterra Board on  June 23, 1995,
Simmons advised the Enterra Board that, in evaluating the conversion rate to  be
used  in the Merger, Simmons had performed  a variety of financial analyses with
respect to Enterra and Weatherford.

    CONVERSION RATE PROFILE.  Simmons performed an analysis of the ratio of  the
market  price of Enterra Common Stock to  the market price of Weatherford Common
Stock during the  period from November  1, 1993 through  June 22, 1995.  Simmons
calculated  the ratio  of the  Enterra Common Stock  closing price  for the last
trading day of  each week  during that period  to the  Weatherford Common  Stock
closing price for such day. This analysis implied a conversion rate ranging from
a  high of  2.28 shares of  Weatherford Common  Stock for each  share of Enterra
Common Stock to a low of 1.54 shares of Weatherford Common Stock for each  share
of  Enterra Common Stock,  with an average  during the period  of 1.89 shares of
Weatherford Common Stock for each share  of Enterra Common Stock (in each  case,
before  giving effect to  the Reverse Stock Split).  Simmons also calculated the
average ratio during the past 30, 60  and 90 days, respectively, of the  Enterra
Common  Stock closing price for each trading day to the Weatherford Common Stock
closing price for such  day. This analysis implied  a conversion rate of  1.73x,
1.70x  and 1.67x  based on  the last  30, 60  and 90-day  periods, respectively.
Simmons also calculated the ratio of the Enterra Common Stock price on June  22,
1995

                                       36
<PAGE>
($20.00 per share) to the Weatherford Common Stock price on such day ($11.25 per
share).  This implied  a conversion  rate of  1.78 shares  of Weatherford Common
Stock for  each share  of Enterra  Common  Stock (before  giving effect  to  the
Reverse Stock Split).

    RELATIVE CONTRIBUTION ANALYSIS.  Simmons analyzed the relative contributions
of  Enterra and  Weatherford to,  among other  things, the  combined last twelve
months ("LTM") EBDIT, LTM net income, analysts' estimates of projected 1995  net
income  and 1996 net income, market capitalization (based on June 22, 1995 share
prices) and market equity value (based on June 22, 1995 share prices) of the two
companies, assuming  completion of  the  Merger (without  giving effect  to  any
transaction   adjustments).  Simmons  calculated  contributions  by  Enterra  of
approximately 47%  of combined  LTM  EBDIT; 32%  of  combined reported  LTM  net
income;  42% of adjusted combined LTM net income (adjusted to eliminate one-time
items and compensate for different tax rates); 39% of projected 1995 net income,
40% of projected 1996 net income, 50% of market capitalization and 48% of market
equity value. Simmons also calculated the percentage of the combined  companies'
equity  that would be held by former Enterra stockholders assuming completion of
the Merger as  46% (using  the conversion  rate to be  used in  the Merger)  and
compared such percentage with the foregoing contribution percentages.

    DISCOUNTED  CASH FLOW ANALYSIS.  Simmons used five-year projections prepared
by Enterra and  developed five-year projections  (based on one-year  projections
prepared  by Weatherford) to  calculate projected future  cash flows for Enterra
and Weatherford,  respectively.  In  developing the  five-year  projections  for
Weatherford,  Simmons took into account the similar nature of a major portion of
the businesses of  Weatherford and  Enterra. Simmons  then performed  discounted
cash  flow analyses based on the unlevered  free cash flows generated by Enterra
and Weatherford employing an estimated terminal  value derived as a multiple  of
seven times EBDIT in such analyses.

    Simmons  discounted to  present value  the respective  projected future cash
flows and  terminal values  of  Enterra and  Weatherford by  applying  after-tax
discount  rates ranging  from 12% to  15%. Based on  these calculations, Simmons
then derived ranges  of present values  per share for  Enterra Common Stock  and
Weatherford  Common Stock. Based on the  respective per share values for Enterra
Common Stock and Weatherford  Common Stock, a conversion  rate range of 1.60  to
1.64  shares of Weatherford Common Stock for  each share of Enterra Common Stock
(before giving effect to the Reverse Stock Split) was calculated.

    PRO FORMA MERGER ANALYSIS.  Simmons  performed an analysis of the effect  of
the  Merger  on the  earnings  per share  and  net cash  flow  per share  of the
Weatherford Common Stock, which would be  the surviving stock after the  Merger,
for the projected results for the years ending December 31, 1995 and 1996, which
assumed  that the Merger was consummated on  January 1, 1995. In performing this
analysis, Simmons also  assumed that  annual consolidation cost  savings of  $30
million  were  fully  realized as  of  January  1, 1995.  Simmons  also excluded
one-time costs associated  with the Merger  for the purposes  of this  analysis.
This analysis indicated that the pro forma impact of the Merger was accretive to
the  earnings and cash flow  per share of Weatherford  Common Stock in both 1995
and 1996.

    Simmons also analyzed the balance sheet  impact of the Merger. At March  31,
1995,  the total debt-to-common equity ratio of Enterra and Weatherford combined
(before  any  one-time  costs  or   other  adjustments)  was  26.5%.   Enterra's
stand-alone debt-to-common equity ratio was 28.1% at March 31, 1995.

    CAPITALIZATION OF ASSUMED CONSOLIDATION EXPENSE REDUCTION.  Simmons took the
expense   reduction  of  $30  million  per   year  assumed  to  be  achieved  as
consolidation cost savings  as a result  of the Merger  and computed an  implied
increase  in the  equity value of  the combined  company based on  an 8.5x EBDIT
multiple applied to the combined pro forma EBDIT including the increase in EBDIT
attributable to the consolidation savings. Simmons then computed that, based  on
the  conversion rate of 1.69  (before giving effect to  the Reverse Stock Split)
and the number of shares of Enterra Common

                                       37
<PAGE>
Stock and  Weatherford  Common  Stock outstanding,  Enterra  stockholders  would
receive  approximately 46%  of any  change in the  equity value  of the combined
company that might result from the consolidation.

    In evaluating the fairness of the conversion rate to be used in the  Merger,
Simmons also considered certain other analyses which are set forth below.

    ANALYSIS OF SELECTED PUBLICLY-TRADED COMPARABLE COMPANIES.  Simmons reviewed
certain  financial information for the 12 months  ended March 31, 1995 and stock
market information as of June 22, 1995 for Enterra and Weatherford, and  certain
publicly available financial information as of the most recently reported period
and  stock market information as of June  22, 1995 for certain similar publicly-
traded oil service companies. For the  purposes of this analysis, this group  of
similar  companies  was  comprised  of Baker  Hughes  Incorporated,  BJ Services
Company, Camco International, Inc.,  Dresser Industries, Inc., Halliburton  Co.,
Smith International, Inc., Tuboscope Vetco International Corporation and Western
Atlas, Inc. (collectively, the "Comparable Companies").

    For  Enterra and Weatherford  and each of  the Comparable Companies, Simmons
calculated multiples of  market stock price  to LTM earnings  and cash flow  per
share,  and estimated  earnings and cash  flow per share  (derived from publicly
available information  concerning  the estimates  of  the future  operating  and
financial  performance  of  Enterra, Weatherford  and  the  Comparable Companies
prepared by industry  experts unaffiliated with  either Enterra or  Weatherford)
for 1995 and 1996, and multiples of adjusted market capitalization to LTM EBDIT.
An analysis of the multiples of market stock price to LTM earnings per share, to
projected  1995  earnings per  share and  to projected  1996 earnings  per share
yielded for Enterra 34.6x, 24.7x and 18.2x, respectively, for Weatherford 18.0x,
17.0x and 13.7x, respectively,  with a mean value  (excluding the highest  value
and  the  lowest  value)  of  23.1x,  20.7x  and  16.8x,  respectively,  for the
Comparable Companies. An analysis of the multiples of market stock price to  LTM
cash flow per share, to estimated 1995 cash flow per share and to estimated 1996
cash  flow per share yielded for Enterra  9.1x, 8.2x and 7.3x, respectively, for
Weatherford 8.2x, 7.8x and 7.0x, respectively, with a mean value (excluding  the
highest  value and the lowest  value) of 9.2x, 8.9x  and 8.2x, respectively, for
the Comparable  Companies.  An analysis  of  the multiples  of  adjusted  market
capitalization  to LTM EBDIT yielded 8.8x for Enterra, 7.8x for Weatherford with
a mean value (excluding the highest value and the lowest value) of 8.7x for  the
Comparable Companies.

    Because  of  the inherent  differences  between the  operations  of Enterra,
Weatherford and  the  Comparable  Companies,  Simmons  believed  that  a  purely
quantitative comparable company analysis would not be exclusively dispositive in
the context of the Merger. Simmons further believed that an appropriate use of a
comparable company analysis in this instance would involve qualitative judgments
concerning  differences between  the financial and  operating characteristics of
Weatherford, Enterra and the Comparable Companies, which judgments are reflected
in Simmons' opinion.

    ANALYSIS OF SELECTED COMPARABLE ACQUISITION TRANSACTIONS.  Simmons  reviewed
17  transactions involving  the acquisition of  all or part  of certain oilfield
service companies.  Simmons calculated  the multiples  of acquisition  price  or
transaction value to LTM revenues and LTM EBDIT and calculated the multiples for
adjusted  acquisition price (defined as acquisition price less the value of debt
assumed in the transaction) to LTM net income of such companies.

    For these  transactions  the  calculations yielded,  excluding  values  that
Simmons  believed  were not  meaningful,  a range  of  acquisition price  to LTM
revenues of 0.8x to 3.9x, with a mean value (excluding the highest value and the
lowest value) of  1.5x, a range  of acquisition price  to LTM EBDIT  of 5.0x  to
10.2x,  with a mean value (excluding the  highest value and the lowest value) of
7.6x and a  range of adjusted  acquisition price to  LTM net income  of 6.2x  to
25.2x,  with a mean value (excluding the  highest value and the lowest value) of
19.0x. Simmons  then compared  the results  of these  calculations to  multiples
calculated  using the  closing prices  of Weatherford  Common Stock  and Enterra
Common Stock on June 22, 1995,  which were $20.00 and $11.25, respectively.  The
calculations  yielded multiples of adjusted market capitalization (which for the
purposes of this analysis was assumed to be comparable to acquisition price)  to
LTM  revenues of  1.5x and  1.8x for  Enterra and  Weatherford, respectively, of

                                       38
<PAGE>
adjusted market capitalization  to LTM EBDIT  of 8.8x and  7.8x for Enterra  and
Weatherford, respectively, and of market equity value (which for the purposes of
this analysis was assumed to be comparable to adjusted acquisition price) to LTM
net income of 34.6x and 18.0x for Enterra and Weatherford, respectively.

    Because  the  reasons  for,  and  circumstances  surrounding,  each  of  the
transactions analyzed  were  so diverse  and  due to  the  inherent  differences
between  the  operations of  Enterra,  Weatherford and  the  selected companies,
Simmons believed  that a  purely  quantitative comparable  transaction  analysis
would  not  be exclusively  dispositive in  the context  of the  Merger. Simmons
further believed that an appropriate use of a comparable transaction analysis in
this instance would involve qualitative judgments concerning differences between
the characteristics of these transactions and  the Merger that would affect  the
acquisition  value of the  acquired companies and  businesses and Enterra, which
judgments are reflected in Simmons' opinion.

    The foregoing summary does not purport  to be a complete description of  the
analyses  performed by Simmons or  of its presentations to  the Enterra Board of
Directors. The  preparation of  financial analyses  and fairness  opinions is  a
complex  process  and  is not  necessarily  susceptible to  partial  analysis or
summary description. Simmons  believes that  its analyses (and  the summary  set
forth  above) must be considered as a  whole and that selecting portions of such
analyses and of the  factors considered by Simmons,  without considering all  of
such  analyses and  factors, could  create an  incomplete view  of the processes
underlying the analyses conducted  by Simmons and its  opinion. Simmons made  no
attempt  to  assign  specific  weights  to  particular  analyses.  Any estimates
contained in Simmons' analyses are not necessarily indicative of actual  values,
which  may be significantly  more or less  favorable than as  set forth therein.
Estimates of values of companies do not purport to be appraisals or  necessarily
to reflect the prices at which companies may actually be sold.

    Simmons  was not authorized to solicit, nor did Simmons solicit from others,
indications of interest with respect to acquiring Enterra. Simmons expressed  no
opinion  regarding the value that would be realized upon the sale or liquidation
of Enterra, and  Simmons' opinion does  not address the  relative merits of  the
Merger  as  compared to  any alternative  business combination  transaction that
might be available to Enterra, including  the acquisition of Enterra by a  third
party.

    Simmons  is a specialized energy-related  investment banking firm engaged in
the valuation of businesses and their securities in connection with mergers  and
acquisitions,  private  placements of  debt and  equity  and the  management and
underwriting of sales of equity and  debt to the public. Simmons has  previously
rendered investment banking services to Enterra and to Weatherford in connection
with a number of transactions for which Simmons received customary compensation.
In  addition, in the ordinary course of business, Simmons may actively trade the
securities of Enterra and Weatherford for  its own account and for the  accounts
of  customers and, accordingly, may at any time hold a long or short position in
such securities.

    Enterra has agreed to pay Simmons  contingent fees totaling $2 million  upon
consummation  of the  Merger. Enterra  has paid  Simmons a  noncontingent fee of
$200,000 that will  be credited  against such contingent  fees. Weatherford  has
agreed  to reimburse Enterra for half of  the noncontingent fee if the Merger is
not consummated.  Enterra  also has  agreed  to reimburse  Simmons  for  certain
expenses incurred in connection with its engagement and to indemnify Simmons and
certain  related persons against certain liabilities and expenses relating to or
arising out of its engagement,  including certain liabilities under the  Federal
securities laws.

    Enterra  has retained Simmons  in connection with  the acquisition of Energy
Industries. In connection  with the Energy  Industries transaction, Enterra  has
agreed to pay Simmons a contingent fee equal to three quarters of one percent of
the   "Transaction  Value"  upon  consummation  of  the  acquisition  of  Energy
Industries. "Transaction Value" is defined as  all cash, notes, stock and  value
of other securities paid by Enterra for Energy Industries plus any such debt for
borrowed  money of Energy  Industries that may be  assumed by Enterra. Enterra's
June 29, 1995  contract to acquire  Energy Industries does  not provide for  the
assumption  by  Enterra  of any  debt  of  Energy Industries.  Enterra  also has
retained

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<PAGE>
Simmons in connection  with the planned  divestitures of three  of its  oilfield
equipment  businesses, for which Enterra has  agreed to pay Simmons a contingent
fee equal to 1.75%  of the Transaction  Value upon consummation  of each of  the
transactions.

    During  the past five years, Enterra  and Weatherford have paid Simmons fees
totaling $30,000  and $1,018,000,  respectively, in  connection with  previously
rendered  investment  banking services.  Simmons  also has  performed investment
banking services for First Reserve from time to time during the past five years,
for which Simmons has received fees totaling $60,000.

INTERESTS OF CERTAIN PERSONS IN THE MERGER

    Certain members  of  the  Board  of Directors  and  management  of  each  of
Weatherford and Enterra have certain interests in the Merger separate from their
interests  as  holders of  Weatherford Common  Stock  and Enterra  Common Stock,
respectively.

    Pursuant to  the  Merger  Agreement  and  the  Stockholders  Agreement,  the
Surviving  Corporation Board of Directors will include Thomas N. Amonett, Philip
Burguieres, William E. Greehey,  John W. Johnson and  Robert K. Moses, Jr.,  who
are  currently directors of Weatherford, and  John A. Hill, William E. Macaulay,
Robert L.  Parker, Sr.,  R. Rudolph  Reinfrank  and Roger  M. Widmann,  who  are
currently  directors of Enterra. Mr. Burguieres will be Chairman of the Board of
Directors of the Surviving Corporation. If within two years after the  Effective
Time  a designee for one of the parties shall decline or be unable to serve as a
director of the Surviving  Corporation, the remaining  designees for such  party
may  designate  for nomination  another person  to act  in such  person's stead,
subject to  the  approval  of  the other  party's  designated  directors,  which
approval  shall not  be unreasonably withheld.  Each committee  of the Surviving
Corporation Board of Directors  will have at least  one Enterra designee  during
the  two  years  following the  Effective  Time.  Each Enterra  designee  to the
Surviving Corporation  Board  of  Directors will  be  covered  by  Weatherford's
Non-Employee  Director Retirement Plan, which provides that prior service on the
Enterra Board of  Directors will count  as service for  all purposes under  such
plan.  Weatherford  also will  enter into  indemnification agreements  with such
Enterra designees.  See "Terms  of the  Merger  -- Conduct  of Business  of  the
Combined Company Following Merger".

    Pursuant  to the Merger  Agreement, Weatherford agreed to  enter into, as of
the Effective Time,  certain arrangements  with D.  Dale Wood,  Chairman of  the
Board,  President and Chief Executive Officer  of Enterra, who will not continue
as an officer or director of  the Surviving Corporation. Pursuant to the  Merger
Agreement,  Enterra has  agreed to negotiate  amendments to  Mr. Wood's existing
severance agreement  with Enterra  to  provide that,  after a  Termination  upon
Change of Control (as defined in such agreement), he will receive (i) in lieu of
cash,  upon the  cancellation of all  outstanding options to  purchase shares of
Enterra Common Stock, that number of shares of Weatherford Common Stock equal in
value to the difference between the aggregate exercise price of such options and
the aggregate  market  price of  such  shares of  Enterra  Common Stock  on  the
Effective  Date and  (ii) a gross-up  payment if  he is subject  to excise taxes
under Section 4999 of the Code (which relates to excess parachute payments under
Section 280G  of  the Code)  (the  "Wood Severance  Agreement  Amendments").  In
addition,  pursuant  to Mr.  Wood's existing  severance agreement  with Enterra,
Weatherford agreed to pay Mr. Wood $915,100 as a severance payment.  Weatherford
also  agreed to  pay Mr.  Wood an amount  between $1,365,000  and $1,865,000 (as
determined by the Enterra Board  of Directors). In addition, Weatherford  agreed
to  enter into a  five-year consulting agreement  with Mr. Wood  providing for a
consulting fee of $50,000 per  year and an option  to purchase 84,500 shares  of
Weatherford  Common Stock (after giving effect to the Reverse Stock Split) at an
exercise price equal  to the  market price of  Weatherford Common  Stock on  the
Closing  Date (after giving effect  to the Reverse Stock  Split) and vesting 20%
each year over the five-year period and exercisable for ten years. See "Terms of
the Merger -- Employee Matters".

    Pursuant to  the  Merger Agreement,  Weatherford  also agreed  to  pay  $1.2
million  to  Philip  Burguieres,  Chairman of  the  Board,  President  and Chief
Executive Officer of Weatherford,  as of the Effective  Time. See "Terms of  the
Merger -- Employee Matters".

                                       40
<PAGE>
    The  officers  of  Weatherford  immediately  prior  to  the  Effective Time,
together with  M.  Timothy  Carey and  Steven  C.  Grant (who  are  officers  of
Enterra),  are  expected  to  be  the  officers  of  the  Surviving Corporation.
Weatherford has agreed to enter into  change of control agreements (which  would
not  treat the  Merger as a  change of control),  on the form  currently used by
Weatherford, with Messrs. Carey and Grant, providing for severance benefits  for
periods  of two years and one  year, respectively. In addition, Weatherford will
enter into  indemnification agreements  with  such persons.  See "Terms  of  the
Merger -- Employee Matters".

    From  the Effective  Time through June  30, 1996, all  employees of Enterra,
including officers,  will be  provided benefits  by Weatherford  under  existing
Enterra  benefit plans or comparable Weatherford benefit plans, and, thereafter,
such employees shall be eligible to participate in Weatherford benefit plans and
to receive the same or  substantially comparable benefits as similarly  situated
Weatherford  employees (in each  case, to the extent  they continue as officers,
directors or employees of  the Surviving Corporation). A  limited number of  key
employees  (none  of  whom  have existing  severance  agreements  with Enterra),
including officers, may receive severance pay awards if they are terminated from
employment for certain  reasons within  one year following  the Effective  Time.
Certain  employees, including the executive officers of Enterra, may be eligible
for bonuses for the  fiscal year ending  1995 and for  additional bonuses to  be
paid  to such  employees in an  aggregate amount  not to exceed  $1 million. See
"Terms of the Merger -- Employee Matters".

    Eleven senior officers of  Enterra (including Messrs.  Carey and Grant)  are
covered  by existing severance  agreements with Enterra.  Pursuant to the Merger
Agreement, Enterra has  agreed to  negotiate amendments to  each such  agreement
(except  for the agreement with  Mr. Wood, which will  be amended to include the
Wood Severance Agreement Amendments) to  provide that, after a Termination  upon
Change  of Control (as defined in such agreement), such officer will receive (i)
in lieu of cash, upon the cancellation of all outstanding substitute options  to
purchase   shares  of  Weatherford  Common  Stock,  that  number  of  shares  of
Weatherford Common Stock equal in value to the difference between the  aggregate
exercise price of such substitute options and the aggregate market price of such
shares  of Weatherford Common Stock  on the date of  such termination and (ii) a
gross-up payment if such officer is  subject to excise taxes under Section  4999
of  the Code (which relates  to excess parachute payments  under Section 280G of
the Code) (collectively, the "Enterra Severance Agreement Amendments"). Payments
due upon  a Termination  upon Change  of Control  (as defined  in the  severance
agreements) assuming termination in 1995 would be as follows: Mr. Wood, $915,100
(as  described above); C. Paul Evans,  $427,350; Mr. Carey, $501,550; Mr. Grant,
$356,800; Steven  W. Krablin,  $335,100; and  the remaining  six officers  as  a
group,  $2,036,500. In  addition, each  such individual  is entitled  to receive
certain  other  benefits   under  his  severance   agreement.  Weatherford   has
acknowledged  that any resignation  by six of  these officers (including Messrs.
Carey and Grant) from the Effective Time through August 12, 1996 will constitute
a Termination upon  Change of  Control for  purpose of  the severance  agreement
between  such person and the Surviving Corporation.  See "Terms of the Merger --
Employee Matters".

    Pursuant to  the  Merger  Agreement,  Weatherford  agreed  to  negotiate  an
amendment  to  twelve  of  the existing  change  of  control  agreements between
Weatherford and certain  of its employees.  The Merger constitutes  a change  of
control  for the purposes  of such agreements. The  amendment would provide that
should the  employee voluntarily  terminate  his or  her employment  during  the
30-day  period  immediately following  the first  anniversary of  the date  of a
change of control, the only termination benefit he or she would receive would be
the benefits related to his or her outstanding stock options, stock appreciation
rights and  restricted common  stock. The  amendment would  eliminate all  other
benefits  under the change of control agreements that otherwise would be payable
upon voluntary termination during such 30-day period. In consideration for  such
amendments  and the elimination of such  benefits, payments by Weatherford would
be as follows: Mr. Burguieres, $630,000; M.E. Eagles, $245,004; James R.  Burke,
$182,004;  Norman  W.  Nolen, $155,004;  H.  Suzanne Thomas,  $155,004;  and the
remaining seven  employees as  a group,  $383,562. In  addition, Weatherford  is
party

                                       41
<PAGE>
to  an additional change of control agreement that does not provide the employee
the right  to voluntarily  terminate  his employment  during the  30-day  period
immediately following the first anniversary of a change of control.

    Pursuant  to the  Merger Agreement, Weatherford  has agreed  to replace each
Enterra Option that  remains unexercised in  whole or in  part at the  Effective
Time  with a substitute option to be granted under an existing Weatherford stock
option plan or pursuant to a separate  stock option agreement. As of the  Record
Date,  the current  executive officers and  directors of  Enterra, excluding Mr.
Wood, held Enterra Options to purchase  379,381 shares of Enterra Common  Stock.
See "Terms of the Merger -- Enterra Options".

    The  Merger Agreement provides  that, after the  Effective Time, Weatherford
and the  Surviving Corporation  will  indemnify the  officers and  directors  of
Enterra  and any of  its subsidiaries against all  costs and expenses (including
reasonable  attorneys'  fees),  judgments,   fines,  losses,  claims,   damages,
liabilities and amounts paid in settlement in connection with any claim, action,
suit,  proceeding or  investigation, whether civil,  criminal, administrative or
investigative, based in whole or in part on, or arising in whole or in part  out
of,  the  fact  that such  person  is or  was  an officer  or  director, whether
pertaining to any matter existing or occurring at or prior to the Effective Time
and whether asserted or  claimed prior to,  at or after  the Effective Time,  as
well  as all liabilities based in whole or in part on, or arising in whole or in
part out  of,  or  pertaining  to,  the Merger  Agreement,  the  Merger  or  the
transactions   contemplated   thereby.  See   "Enterra  Corporation   --  Recent
Developments" and "Terms of the Merger -- Indemnification".

    In conjunction  with  the execution  of  the Merger  Agreement,  Weatherford
entered into the Stockholders Agreement with First Reserve and the First Reserve
Funds,  which has  substantially the  same terms  as the  stockholders agreement
currently in effect among  Enterra, First Reserve and  the First Reserve  Funds.
Among  other things, the Stockholders Agreement,  which will become effective at
the Effective Time,  entitles the  First Reserve Group  to designate  up to  two
directors  of the  Surviving Corporation (subject  to the  amount of Weatherford
Voting Securities (as  hereinafter defined)  held by them).  Under the  existing
Enterra stockholders agreement, the First Reserve Group is entitled to designate
up  to four members  of the Enterra  Board of Directors.  Under the Stockholders
Agreement and the  existing Enterra  stockholders agreement,  the First  Reserve
Group  is entitled  to have at  least one of  the designees serve  on each board
committee. The  Stockholders  Agreement  also grants  the  First  Reserve  Group
registration  rights  that  are  identical  to  those  included  in  the Enterra
stockholders  agreement.   The   Stockholders  Agreement,   like   the   Enterra
stockholders agreement, requires the First Reserve Group to vote the Weatherford
securities  (or  Enterra securities,  with respect  to the  Enterra stockholders
agreement) it beneficially owns (i) in accordance with the recommendations of  a
majority  of  the  Weatherford  Board  of Directors  (or  the  Enterra  Board of
Directors, as the case may be) or (ii) in the same proportions (for, against and
abstaining) in respect  of any matter  as the holders  of record of  Weatherford
voting securities (or Enterra voting securities, as the case may be), other than
those beneficially owned by the First Reserve Group that are entitled to vote on
such   matter,  vote  the  Weatherford  voting  securities  (or  Enterra  voting
securities, as  the case  may be).  See  "Terms of  the Merger  --  Stockholders
Agreement".  Under the terms of the existing Enterra stockholders agreement, the
First Reserve Group  had the  option, in its  discretion, of  either voting  the
Enterra  Common Stock over which they had  voting control in accordance with the
recommendation of a majority of the Enterra  Board of Directors, or in the  same
proportion  (for, against or  abstaining) as voted  by all holders  of record of
Enterra Common Stock other than the  First Reserve Group. First Reserve and  the
First  Reserve Funds have entered into an agreement with Weatherford pursuant to
which they have  agreed to vote  the 11,212,349 shares  of Enterra Common  Stock
over  which they  have voting control,  representing approximately  40.3% of the
outstanding shares as of the Record Date, in favor of the adoption of the Merger
Agreement unless the  Enterra Board  of Directors, at  the time  of the  Enterra
Special  Meeting, is recommending that the Enterra stockholders vote against the
adoption of the Merger Agreement in view of the pendency of an Enterra  Superior
Proposal.  Thus,  in  a  situation  where  the  Enterra  Board  of  Directors is
recommending that the Enterra stockholders vote for the

                                       42
<PAGE>
approval and adoption of the Merger and the Merger Agreement, the First  Reserve
Group,  absent this  agreement with  Weatherford, would  have had  the option of
voting its shares in the  same proportion as voted by  all holders of record  of
Enterra  Common Stock  other than  the First  Reserve Group.  In addition,  in a
situation where the stockholders  of Enterra are  presented with an  alternative
proposal  to the Merger and the Board  of Directors is not recommending that the
stockholders vote against the approval and adoption of the Merger and the Merger
Agreement, the  First Reserve  Group, absent  this agreement  with  Weatherford,
would  have been committed to voting its  shares in the same proportion as voted
by all holders of record  of Enterra Common Stock  other than the First  Reserve
Group.  The Enterra Board (with Messrs. Macaulay, Widmann and Edelman abstaining
and Mr. Hill not  present, each of  whom was appointed to  the Enterra Board  of
Directors  by the  First Reserve  Group pursuant  to an  agreement with Enterra)
voted to  consent to  this modification,  and the  First Reserve  Group in  turn
agreed  with Enterra that  if, at the  time of the  Enterra Special Meeting, the
Enterra Board of Directors  is recommending that  the Enterra stockholders  vote
against  the  adoption of  the  Merger Agreement,  First  Reserve and  the First
Reserve Funds will vote the foregoing shares against such adoption. Absent  this
agreement  with Enterra, the  First Reserve Group  would have had  the option of
voting its shares in  the same proportion  as voted by all  holders in the  same
proportion  as voted by all holders of record of Enterra Common Stock other than
the First Reserve Group.

CERTAIN U.S. FEDERAL INCOME TAX CONSEQUENCES

    The  following  discussion  summarizes  certain  U.S.  Federal  income   tax
consequences  of the Merger to  holders of Enterra Common  Stock under the Code,
but does not deal with all tax  consequences of the Merger that may be  relevant
to  particular Enterra stockholders,  such as dealers  in securities and foreign
persons.

    THIS SUMMARY  SHOULD NOT  BE  REGARDED AS  A  SUBSTITUTE FOR  AN  INDIVIDUAL
ANALYSIS  OF THE TAX CONSEQUENCES OF THE  MERGER TO AN ENTERRA STOCKHOLDER. EACH
ENTERRA STOCKHOLDER SHOULD CONSULT  A TAX ADVISOR  REGARDING THE PARTICULAR  TAX
CONSEQUENCES OF THE MERGER TO SUCH STOCKHOLDER'S OWN SITUATION.

    Neither  Weatherford nor  Enterra has requested  a ruling  from the Internal
Revenue Service (the "Service") in  connection with the Merger. Weatherford  has
received from its counsel, Fulbright & Jaworski L.L.P., an opinion to the effect
that  the  Merger will  be treated  for U.S.  Federal income  tax purposes  as a
reorganization  within  the  meaning  of  Section  368(a)  of  the  Code,   that
Weatherford  and Enterra will each  be a party to  the reorganization within the
meaning of Section 368(b) of the Code, and that Weatherford and Enterra will not
recognize any gain or loss as a result  of the Merger. It is a condition to  the
obligation  of Weatherford to consummate the  Merger that such opinion shall not
have been withdrawn or  modified in any material  respect. Enterra has  received
from  its counsel, Morgan,  Lewis & Bockius,  an opinion to  the effect that the
Merger will be treated for U.S. Federal income tax purposes as a  reorganization
within  the meaning of Section 368(a) of  the Code, that Weatherford and Enterra
will each be a party to the reorganization within the meaning of Section  368(b)
of  the Code, and  that stockholders of  Enterra will not  recognize any gain or
loss as a result of the Merger, except  to the extent they receive cash in  lieu
of  fractional shares  of Weatherford  Common Stock.  It is  a condition  to the
obligation of Enterra to consummate the Merger that such opinion shall not  have
been  withdrawn  or modified  in  any material  respect.  Such opinions  will be
subject  to  certain  assumptions  and  based  on  certain  representations   of
Weatherford and Enterra. Enterra stockholders should be aware that such opinions
will  neither be binding upon the Service nor will the Service be precluded from
adopting a contrary position.

    Assuming the Merger qualifies  as a reorganization  under Section 368(a)  of
the Code, the following U.S. Federal income tax consequences will occur:

        (a)  No gain  or loss  will be recognized  by Weatherford  or Enterra in
    connection with the Merger.

        (b) No gain or  loss will be  recognized by a  holder of Enterra  Common
    Stock  who exchanges all of his or her shares of Enterra Common Stock solely
    for shares of Weatherford Common Stock in the Merger.

                                       43
<PAGE>
        (c) The aggregate basis of the shares of Weatherford Common Stock to  be
    received  by an Enterra stockholder in the Merger (including any fraction of
    a share not actually received)  will be the same  as the aggregate basis  of
    the shares of Enterra Common Stock surrendered in exchange therefor.

        (d)  The holding period of the shares  of Weatherford Common Stock to be
    received by an Enterra  stockholder in the Merger  will include the  holding
    period  of  the  shares  of Enterra  Common  Stock  surrendered  in exchange
    therefor, provided that  such shares  of Enterra  Common Stock  are held  as
    capital assets at the Effective Time.

        (e) Cash payments in lieu of a fraction of a share will be treated as if
    a  fraction of a share of Weatherford  Common Stock had been received in the
    Merger and then redeemed by Weatherford. Such a redemption should qualify as
    a distribution  in full  payment in  exchange for  the fraction  of a  share
    rather  than  as  a  distribution of  a  dividend.  Accordingly,  an Enterra
    stockholder receiving cash in lieu of  a fraction of a share will  recognize
    gain or loss upon such payment equal to the difference, if any, between such
    stockholder's  basis in the  fraction of a share  (as described in paragraph
    (c) above) and  the amount of  cash received. Such  gain or loss  will be  a
    capital  gain or loss if the Enterra Common Stock is held as a capital asset
    at the Effective Time.

    THE U.S. FEDERAL INCOME  TAX CONSEQUENCES SUMMARIZED  ABOVE ARE FOR  GENERAL
INFORMATION  ONLY. EACH ENTERRA  STOCKHOLDER SHOULD CONSULT A  TAX ADVISOR AS TO
THE PARTICULAR CONSEQUENCES OF  THE MERGER THAT MAY  APPLY TO SUCH  STOCKHOLDER,
INCLUDING  THE APPLICATION  OF THE  STATE INHERITANCE AND  GIFT TAX  LAWS AND OF
STATE, LOCAL AND FOREIGN TAX LAWS.

ACCOUNTING TREATMENT

    The Merger will be accounted for using the "pooling of interests" method  of
accounting  pursuant to Opinion  No. 16 of the  Accounting Principles Board. The
"pooling of interests" method of accounting assumes that the combining companies
have been merged  from inception,  and the historical  financial statements  for
periods prior to consummation of the Merger are restated as though the companies
had been combined from inception. The restated financial statements are adjusted
to conform the accounting policies of the separate companies.

    Weatherford  and  Enterra  have been  advised  by  Weatherford's independent
public accountants, Arthur Andersen  LLP, that Weatherford is  eligible to be  a
party  to a merger  accounted for as a  "pooling of interests"  and they are not
aware of any matters that prohibit the use of "pooling of interests"  accounting
in  connection with  the Merger.  Weatherford and  Enterra have  been advised by
Enterra's independent certified public accountants, KPMG Peat Marwick LLP,  that
no  conditions exist that would preclude Weatherford's accounting for the Merger
as a "pooling of interests" as those conditions relate to Enterra.

GOVERNMENTAL AND REGULATORY APPROVALS

    Transactions such as the  Merger are reviewed by  the Department of  Justice
and  the FTC  to determine whether  they comply with  applicable antitrust laws.
Under the provisions of  the HSR Act,  the Merger may  not be consummated  until
such  time as the specified waiting period requirements of the HSR Act have been
satisfied.  Weatherford  and  Enterra   filed  notification  reports  with   the
Department  of Justice on  June 30, 1995 and  with the FTC under  the HSR Act on
June 30, 1995 and July 3, 1995, respectively. The required waiting period  under
the HSR Act expired on August 2, 1995.

    At  any time before or after the  Effective Time, the Department of Justice,
the FTC or a private person or entity could seek under the antitrust laws, among
other things, to enjoin the Merger or to cause Weatherford to divest itself,  in
whole  or in part, of  Enterra or of other  businesses conducted by Weatherford.
There can be no  assurance that a challenge  to the Merger will  not be made  or
that, if such a challenge is made, Weatherford and Enterra will prevail.

    Weatherford  and  Enterra are  aware of  no  other material  governmental or
regulatory approvals  required  for  consummation  of  the  Merger,  other  than
compliance with applicable securities laws of the various states.

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<PAGE>
NYSE LISTING

    As  a condition  to the  closing of  the Merger,  the shares  of Weatherford
Common Stock to be issued upon consummation  of the Merger will be approved  for
listing on the NYSE, subject to official notice of issuance.

RESTRICTIONS ON RESALES BY AFFILIATES

    The   shares  of  Weatherford  Common  Stock   to  be  received  by  Enterra
stockholders in  connection  with the  Merger  have been  registered  under  the
Securities   Act  and,  except  as  set  forth  below,  may  be  traded  without
restriction. The shares of Weatherford Common  Stock to be issued in the  Merger
and  received by  persons who  are deemed  to be  "affiliates" (as  that term is
defined in Rule 144 under the Securities Act) of Enterra prior to the Merger may
be resold by  them only in  transactions permitted by  the resale provisions  of
Rule  145 under the Securities  Act (or, in the case  of such persons who become
affiliates of Weatherford, Rule  144 under the Securities  Act) or as  otherwise
permitted  under the Securities Act. The  Merger Agreement provides that Enterra
will use its  reasonable efforts to  cause its affiliates  to execute a  written
agreement  to the effect that such persons  will not sell, transfer or otherwise
dispose of  any  shares of  Weatherford  Common  Stock issued  to  such  persons
pursuant  to the  Merger in  violation of  the Securities  Act or  the rules and
regulations promulgated thereunder.

    Pursuant to the Merger Agreement,  Weatherford and Enterra each have  agreed
to  use reasonable efforts to cause its affiliates to execute written agreements
not to take  any action  that would  cause the  Merger not  to be  treated as  a
"pooling  of  interests"  for  accounting  purposes.  Under  generally  accepted
accounting principles, the sale  of Weatherford Common  Stock or Enterra  Common
Stock  by an affiliate of either Weatherford  or Enterra within 30 days prior to
the Effective Time or thereafter prior  to the publication of financial  results
that  include at least 30 days of combined operations of Weatherford and Enterra
after the  Effective  Time  could preclude  "pooling  of  interests"  accounting
treatment of the Merger.

NO DISSENTERS' RIGHTS

    Delaware law does not provide holders of Weatherford Common Stock or holders
of Enterra Common Stock who object to the Merger and who vote against or abstain
from  voting in favor of the Merger  and the Merger Agreement with any appraisal
rights or the right to receive cash for their shares of Weatherford Common Stock
or Enterra Common Stock, respectively.  Neither Weatherford nor Enterra  intends
to make available such rights to its stockholders.

                                       45
<PAGE>
                              TERMS OF THE MERGER

EFFECTIVE TIME OF THE MERGER

    The  Merger Agreement provides that the  Merger will become effective at the
effective time set  forth in  the certified copy  of the  Certificate of  Merger
issued  by the Secretary of  State of the State of  Delaware with respect to the
Merger. It  is anticipated  that, if  the Merger  Agreement is  approved at  the
Weatherford  Special  Meeting  and the  Enterra  Special Meeting  and  all other
conditions to the Merger have been satisfied or waived, the Effective Time  will
occur as soon as practicable thereafter.

MANNER AND BASIS OF CONVERTING SHARES

    The  Merger Agreement  provides that, at  the Effective Time,  each share of
Enterra Common  Stock issued  and outstanding,  other than  shares held  in  the
treasury   of  Enterra  or  held  by  Weatherford  or  any  direct  or  indirect
wholly-owned subsidiary  of Enterra  or  of Weatherford  (which shares  will  be
canceled  and extinguished at the Effective  Time without any conversion thereof
and no payment shall be made with  respect thereto), will be converted into  the
right  to receive 1.69 shares of  Weatherford Common Stock, before giving effect
to the Reverse Stock Split (0.845 of  a share of Weatherford Common Stock  after
giving effect to the Reverse Stock Split).

    As  soon as practicable following the Effective Time, Weatherford will cause
American Stock Transfer &  Trust Company, which will  act as Exchange Agent  for
the  Enterra Common Stock, to mail to each record holder of Enterra Common Stock
immediately prior  to the  Effective Time,  a letter  of transmittal  and  other
information  advising such holder of the consummation  of the Merger and for use
in exchanging Enterra  Common Stock  certificates for  Weatherford Common  Stock
certificates  and cash in lieu of fractional shares. Letters of transmittal also
will be available following  the Effective Time at  the offices of the  Exchange
Agent. SHARE CERTIFICATES SHOULD NOT BE SURRENDERED FOR EXCHANGE BY STOCKHOLDERS
OF  ENTERRA PRIOR  TO APPROVAL  OF THE  MERGER AND  THE RECEIPT  OF A  LETTER OF
TRANSMITTAL.

    No fraction of a  share of Weatherford  Common Stock will  be issued in  the
Merger.  Each stockholder of Enterra otherwise entitled to a fraction of a share
will, upon surrender of Enterra Common  Stock certificates held by such  holder,
be  paid an amount in cash equal to the  value of such fraction of a share based
upon the closing  price of  Weatherford Common  Stock on  the NYSE  on the  last
trading day prior to the Effective Time. No interest will be paid on such amount
and  all  shares  of Enterra  Common  Stock held  by  a record  holder  shall be
aggregated for purposes of computing the number of shares of Weatherford  Common
Stock to be issued in the Merger.

    Until  such time as a  holder of Enterra Common  Stock surrenders his or her
outstanding  stock  certificate  to  the   Exchange  Agent,  together  with   an
appropriately  completed  and  executed  letter of  transmittal,  the  shares of
Enterra Common  Stock represented  thereby will  be deemed  from and  after  the
Effective  Time, for  all corporate purposes  other than the  payment of earlier
dividends and distributions,  to evidence the  ownership of the  number of  full
shares  of Weatherford  Common Stock  into which  such shares  may be converted.
Unless and until such outstanding certificates are surrendered, no dividends  or
other  distributions payable to  the holders of Weatherford  Common Stock, as of
any time on or  after the Effective Time,  will be paid to  the holders of  such
outstanding   certificates.  Upon  surrender   of  the  certificates  previously
representing Enterra Common Stock, the holder thereof will receive  certificates
representing the number of shares of Weatherford Common Stock to which he or she
is  entitled,  cash in  lieu of  a fraction  of a  share and  the amount  of any
dividends or  other distributions,  if any,  payable to  holders of  Weatherford
Common Stock on or after the Effective Time with respect to such shares, without
interest thereon.

ENTERRA OPTIONS

    Pursuant  to the  Merger Agreement,  at the  Effective Time,  each option to
purchase shares of Enterra Common Stock outstanding as of the date of the Merger
Agreement ("Enterra Option") that remains unexercised  in whole or in part  will
be  replaced by a substitute option, granted under an existing Weatherford stock
option plan or pursuant to a  separate stock option agreement, to purchase  that
number  of  shares of  Weatherford Common  Stock  determined by  multiplying the
number of

                                       46
<PAGE>
shares of Enterra Common Stock subject to such Enterra Option by the  conversion
rate  to be used in the Merger (after  giving effect to the Reverse Stock Split)
and multiplying  the  exercise price  per  share of  such  Enterra Option  by  a
fraction  the numerator  of which is  one and  the denominator of  which is such
conversion rate. Each such substitute option will otherwise replicate the  terms
and  conditions of  the Enterra Option  it replaces. The  shares underlying each
such substitute option will be registered  under the Securities Act even if  the
proposed  amendment to the 1991 Option Plan  is not approved by the stockholders
of Weatherford. See "Proposal to Amend Weatherford's 1991 Stock Option Plan".

EMPLOYEE MATTERS

    Pursuant to the  Merger Agreement,  Weatherford agreed,  from the  Effective
Time  through June 30, 1996, to either maintain Enterra's employee benefit plans
or  provide  substantially  comparable  benefits  to  Enterra  employees   under
Weatherford's employee benefit plans. From and after July 1, 1996, participation
in  Weatherford employee benefit plans would be made available to all employees,
including former employees of Enterra, with similar or substantially  comparable
benefits  being  provided  to  similarly situated  employees.  All  service with
Enterra prior to the Effective Time, and any other service recognized under  the
applicable  benefit plans of Enterra for  vesting and eligibility purposes, will
be credited to such employees to whom participation in Weatherford benefit plans
is  made  available,  and  all   waiting  periods  and  pre-existing   condition
limitations   will  be  waived  for  employees  of  Enterra  under  such  plans.
Weatherford also agreed to  make non-elective employer contributions,  including
fixed  or discretionary pension,  profit sharing and  matching contributions, to
each benefit  plan  of  Enterra that  is  intended  to be  a  qualified  defined
contribution  benefit plan under  Section 401(a) of the  Code for the respective
benefit plans for the first plan year  ending on or after the Effective Time  in
accordance with the terms of such plans. Weatherford has agreed that the rate of
such non-elective employer contributions shall not be less than the rate of such
non-elective  employer contribution that was made to the respective benefit plan
for the last plan year ending prior to the Effective Time. Each Enterra employee
who is a participant in  such an Enterra benefit  plan immediately prior to  the
Effective  Time will be  entitled to receive an  allocation of such non-elective
employer contributions without regard to whether such person continues to be  an
employee  of the Surviving Corporation at the  end of the plan year with respect
to such Enterra benefit plan.

    Both Enterra and  Weatherford agreed  to establish, prior  to the  Effective
Time, substantially similar special severance pay plans to provide severance pay
awards  to a limited number of key  employees who are terminated from employment
in connection with the  Merger. Each special severance  pay plan is intended  to
alleviate,  in part or in  full, financial hardships that  may be experienced by
such terminated employees and is intended  to constitute a "severance pay  plan"
under  regulations published by the U.S. Secretary of Labor. Each company's plan
will cover 17  employees, none  of whom  has an  existing change  of control  or
severance agreement. Such plans will provide, among other things, that a covered
employee  will receive a cash payment equal  to one year's compensation if he or
she is terminated without cause within one year following the Effective Time.

    The Enterra Board of Directors or its Executive Compensation Committee  will
declare,  prior to the Effective Time, the  amount of bonuses payable to Enterra
employees based upon Enterra's achievement of certain financial or other targets
for the fiscal year  ending December 31,  1995, which shall  be determined in  a
manner consistent with bonuses paid for the 1994 fiscal year (provided, however,
that  if the audited financial results for the year ending December 31, 1995 are
not known until after the Effective  Time, Messrs. Macaulay and Parker, both  of
whom  are  Enterra directors  who will  continue as  directors of  the Surviving
Corporation, will make such bonus determinations). The 1995 bonuses will be paid
in February 1996. In addition  to the foregoing, Enterra  may pay bonuses at  or
prior  to the Effective Time to Enterra  employees in an aggregate amount not to
exceed $1 million, as determined by Enterra's Executive Compensation  Committee;
provided,  however, that no one employee may  receive in excess of the aggregate
of his or her annualized salary and most recent annual bonus.

                                       47
<PAGE>
    Weatherford has agreed  to enter  into change of  control agreements  (which
would not treat the Merger as a change of control) with Messrs. Carey and Grant,
officers  of  Enterra who  will become  officers  of the  Surviving Corporation,
providing for severance benefits for two  years and one year, respectively,  and
indemnification  agreements with Messrs.  Carey and Grant,  and the directors of
Enterra who will  become directors  of the Surviving  Corporation. In  addition,
eleven  senior  officers  of Enterra  (including  Messrs. Carey  and  Grant) are
covered by existing severance  agreements with Enterra.  Pursuant to the  Merger
Agreement,  Enterra has  agreed to negotiate  amendments to  each such agreement
(except for the agreement with  Mr. Wood, which will  be amended to include  the
Wood  Severance Agreement Amendments) to include the Enterra Severance Agreement
Amendments. Weatherford has acknowledged  that any resignation  by six of  these
officers  (including Messrs.  Carey and Grant)  from the  Effective Time through
August 12,  1996 will  constitute a  "Termination upon  Change in  Control"  for
purposes  of  the  severance agreement  between  such person  and  the Surviving
Corporation. Such  status would  entitle  the respective  officer to  leave  the
employment  of the Surviving  Corporation for any reason  during such period and
receive certain  severance payments.  See "The  Merger --  Interests of  Certain
Persons in the Merger".

    Pursuant  to  the  Merger  Agreement,  Weatherford  agreed  to  negotiate an
amendment to  twelve  of  the  existing change  of  control  agreements  between
Weatherford  and certain  of its employees.  The Merger constitutes  a change of
control for the purposes  of such agreements. The  amendment would provide  that
should  the  employee voluntarily  terminate his  or  her employment  during the
30-day period  immediately following  the first  anniversary of  the date  of  a
change of control, the only termination benefit he or she would receive would be
the benefits related to his or her outstanding stock options, stock appreciation
rights  and restricted  common stock.  The amendment  would eliminate  all other
benefits under the change of control  agreement that otherwise would be  payable
upon  voluntary termination during such 30-day period. In consideration for such
amendments and  the elimination  of  such benefits,  Weatherford will  pay  such
persons  an aggregate  of approximately  $1.7 million  in cash  at the Effective
Time. In  addition, Weatherford  is party  to an  additional change  of  control
agreement  that does not provide the employee the right to voluntarily terminate
his  employment  during  the  30-day  period  immediately  following  the  first
anniversary of a change of control.

    Pursuant  to the Merger  Agreement, Weatherford agreed to  enter into, as of
the Effective Time,  certain arrangements  with D.  Dale Wood,  Chairman of  the
Board,  President and Chief Executive Officer  of Enterra, who will not continue
as an officer or director of  the Surviving Corporation. Pursuant to the  Merger
Agreement,  Enterra has  agreed to negotiate  amendments to  Mr. Wood's existing
severance agreement  with  Enterra  to  include  the  Wood  Severance  Agreement
Amendments.  In addition,  pursuant to  Mr. Wood's  existing severance agreement
with Enterra as so  amended, Weatherford agreed  to pay Mr.  Wood $915,100 as  a
severance  payment. Weatherford  also agreed to  pay Mr. Wood  an amount between
$1,365,000 and $1,865,000 (as determined by the Enterra Board of Directors).  In
addition, Weatherford agreed to enter into a five-year consulting agreement with
Mr.  Wood providing for  a consulting fee of  $50,000 per year  and an option to
purchase 84,500 shares of Weatherford Common  Stock (after giving effect to  the
Reverse  Stock  Split)  at  an  exercise price  equal  to  the  market  price of
Weatherford Common Stock on the Closing Date (after giving effect to the Reverse
Stock Split) and vesting 20% each year over the five-year period and exercisable
for ten years.

    Pursuant to  the  Merger Agreement,  Weatherford  also agreed  to  pay  $1.2
million  to  Philip  Burguieres,  Chairman of  the  Board,  President  and Chief
Executive Officer of Weatherford, as of the Effective Time.

STOCKHOLDERS AGREEMENT

    In conjunction  with  the execution  of  the Merger  Agreement,  Weatherford
entered into the Stockholders Agreement with First Reserve and the First Reserve
Funds,  which has  substantially the  same terms  as the  stockholders agreement
currently in effect among  Enterra, First Reserve and  the First Reserve  Funds,
which  agreement by  its terms would  otherwise survive the  Merger. Among other
things, the Stockholders Agreement, which will become effective at the Effective
Time, restricts the

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<PAGE>
voting and disposition of Weatherford securities beneficially owned by the First
Reserve Group. The principal terms of the Stockholders Agreement are  summarized
below.  The following description is qualified by, and made subject to, the more
complete information set forth in the Stockholders Agreement, a copy of which is
attached  as  Appendix  D  to  this  Joint  Proxy  Statement/Prospectus  and  is
incorporated herein by reference.

    TERM.   The term of the Stockholders Agreement (the "Term") will commence at
the Effective  Time and  continue through  the date  originally agreed  to  with
Enterra,  which is  August 12, 2004.  If at any  time during the  Term the First
Reserve Group beneficially owns "Weatherford Voting Securities" (as  hereinafter
defined)  representing  less  than  10%  of  the  "Combined  Voting  Power"  (as
hereinafter defined),  then  the restrictions  on  and covenants  of  the  First
Reserve Group relating to (i) the distribution of Weatherford Voting Securities,
(ii)  the creation of voting trusts, (iii) the solicitation of proxies, (iv) the
pooling of stock, (v)  the giving of notice  regarding margin calls and  actions
against  pledged stock, (vi) voting restrictions and Board and committee nominee
designation rights, (vii) registration rights and (viii) the placing of  legends
and  stop transfer orders  on stock certificates, would  be suspended until such
time as  the First  Reserve  Group again  beneficially owns  Weatherford  Voting
Securities  representing 10%  or more  of the  Combined Voting  Power; provided,
however, that notwithstanding  the foregoing,  the First Reserve  Group may  not
dispose  of any Weatherford Voting Securities to  any one person or group (a) if
such Weatherford Voting Securities represent 5%  or more of the Combined  Voting
Power  or (b) who, upon consummation  of such disposition, would have beneficial
ownership of  Weatherford Voting  Securities  representing 10%  or more  of  the
Combined  Voting Power. "Combined  Voting Power" is  defined in the Stockholders
Agreement as the total number of votes  at any measurement date that could  have
been  cast  in an  election of  directors of  Weatherford had  a meeting  of the
stockholders of Weatherford been duly held if all Weatherford Voting  Securities
then  outstanding and entitled to vote at such meeting were present and voted to
the fullest extent possible. "Weatherford Voting Securities" are defined in  the
Stockholders  Agreement  as  any  securities  of  Weatherford  entitled  to vote
generally in the election of directors or otherwise.

    REPRESENTATION ON THE WEATHERFORD BOARD OF DIRECTORS.  During the Term,  two
of  four  designated First  Reserve  Funds will  be  permitted to  designate two
members for nomination to the Weatherford Board of Directors; provided, however,
that (i) at any time that the First Reserve Group ceases to beneficially own  at
least  15%, but continues to own at least 10%, of the Combined Voting Power, one
of the designating First Reserve Funds will lose its right to designate a member
for nomination to the Weatherford Board of Directors and will cause its director
designee to resign from the Weatherford Board of Directors and (ii) at any  time
that  the First  Reserve Group ceases  to beneficially  own at least  10% of the
Combined Voting Power, the  remaining designating First  Reserve Fund will  lose
its  right to  designate a  member for  nomination to  the Weatherford  Board of
Directors and will cause  its director designee to  resign from the  Weatherford
Board of Directors.

    For as long as the designating First Reserve Funds are entitled to designate
two  members for nomination  to the Weatherford  Board of Directors, Weatherford
will take all  necessary or  appropriate action  to have  at least  one of  such
designees  serve on each committee of the  Weatherford Board of Directors and to
have each  designee serve  in a  different  class of  the Weatherford  Board  of
Directors.

    During  the Term, Weatherford and the First  Reserve Group will not agree to
increase the number of directors of  Weatherford above ten without the  approval
of  a majority  of directors and  all of  the directors designated  by the First
Reserve Group,  and the  First Reserve  Group  agrees that  neither it  nor  its
designated  directors will  take any  action to  reduce the  number of directors
below ten.

    VOTING OF SHARES.  During the Term, the First Reserve Group has agreed to be
present in person or  represented by proxy at  all of Weatherford's  stockholder
meetings and to vote all Weatherford Voting Securities beneficially owned by the
First  Reserve Group for all management nominees for director and, in respect of
any  other  matter  on  which  holders  of  Weatherford  Voting  Securities  are

                                       49
<PAGE>
entitled  to vote, to  vote either in  accordance with the  recommendations of a
majority of the Weatherford Board of Directors or in the same proportions  (for,
against  and abstaining) as voted by all holders of record of Weatherford Voting
Securities other than the First Reserve Group.

    ACQUISITION  OF  WEATHERFORD   VOTING  SECURITIES  BY   THE  FIRST   RESERVE
GROUP.   During the Term, the First Reserve  Group has agreed not to acquire any
Weatherford Voting Securities  if the  effect of  such acquisition  would be  to
either  increase  the First  Reserve Group's  aggregate beneficial  ownership of
Weatherford Voting Securities  to 20% or  more of the  Combined Voting Power  or
increase  the First Reserve Group's aggregate  beneficial ownership of any class
or series  of Weatherford  Voting Securities  to more  than 20%  unless (i)  the
increase  in  ownership occurred  solely as  a result  of a  recapitalization of
Weatherford  or  other  action  by  Weatherford  or  its  affiliates,  if   such
recapitalization or other action was approved by a majority of the directors not
designated  by  the First  Reserve  Group, or  (ii)  any other  person  or group
beneficially owns or  acquires more  than 20% of  the Combined  Voting Power  in
which case the maximum percentage ownership for the First Reserve Group would be
increased to equal such other group's ownership percentage.

    CERTAIN PROHIBITIONS ON THE FIRST RESERVE GROUP.  During the Term and except
as otherwise provided, the First Reserve Group has agreed to not (i) deposit any
Weatherford  Voting Securities owned by them in a voting trust or enter into any
similar voting arrangement unless  all the parties to  the trust or  arrangement
are  First Reserve Group members, (ii) make or in any way become a "participant"
in a "solicitation"  of proxies  (as such  terms are  defined in  Rule 14a-1  of
Regulation  14A under the Exchange Act) in opposition to the recommendation of a
majority of Weatherford directors not designated by the First Reserve Group,  or
submit any proposal for a vote of Weatherford stockholders, (iii) participate in
or  become  a  member  of a  "13D/G  Group"  (as  that term  is  defined  in the
Stockholders Agreement), other than the First Reserve Group, for the purposes of
holding, acquiring, voting  or disposing  of Weatherford  Voting Securities,  or
(iv)  make a  proposal to Weatherford  or a  third party or  initiate, induce or
encourage any proposal that could reasonably  be expected to result in a  change
of  control of Weatherford or  make any public announcement  with respect to any
such proposal.

    Subject to compliance with the preceding paragraph, if a tender or  exchange
offer  for Weatherford Voting Securities is made  by a person other than a First
Reserve Group  member, then  any First  Reserve Group  member would  be able  to
tender  or exchange any  Weatherford Voting Securities  beneficially owned by it
pursuant to such offer  on or after the  eleventh day following commencement  of
the  offer,  if such  offer shall  have been  approved, or  not opposed,  by the
Weatherford Board of  Directors. If  such offer  is opposed  by the  Weatherford
Board  of Directors, then any First Reserve  Group member may tender or exchange
shares of Weatherford Voting  Securities pursuant to such  offer only if (i)  no
tender  or exchange,  or indication  of an intention  to tender  or exchange, of
Weatherford Voting Securities is made by any First Reserve Group member  earlier
than 24 hours prior to the expiration of any time after which Weatherford Voting
Securities  tendered  may  be  treated less  favorably  than  Weatherford Voting
Securities tendered or exchanged prior thereto, and (ii) a binding agreement  is
reached  with the bidder or  offeror prior to any  tender or exchange specifying
that only such number of Weatherford  Voting Securities submitted for tender  or
exchange  shall be  accepted by the  bidder or offeror  as are equal  to (A) the
percentage of such Weatherford Voting  Securities not beneficially owned by  the
First  Reserve Group that have been tendered or exchanged, multiplied by (B) the
total number of such  Weatherford Voting Securities  beneficially owned by  such
member of the First Reserve Group.

    DISPOSITION  OF VOTING SECURITIES BY FIRST  RESERVE GROUP.  During the Term,
the First Reserve  Group has  agreed to not  dispose of  any Weatherford  Voting
Securities  except  (i) in  a  bona fide  pledge of  or  granting of  a security
interest, lien or encumbrance in such Weatherford Voting Securities to a  lender
that  is not a First Reserve  Group member to secure a  bona fide loan for money
borrowed made to one or more First  Reserve Group members with full recourse  to
the  borrower  or borrowers,  or  a related  foreclosure  or disposition  by the
lender, (ii) by transfer,  assignment, sale or  disposition of such  Weatherford
Voting  Securities to another First Reserve  Group member, (iii) by distribution
of Weatherford  Voting  Securities to  any  partner  of a  First  Reserve  Fund,
provided that any such distributee

                                       50
<PAGE>
that  is  a  member of  the  First  Reserve Group  has  signed  the Stockholders
Agreement and that the subsequent distributions of such distributee, if assisted
by First  Reserve, conform  with the  distribution restrictions  imposed by  the
Stockholders   Agreement,  (iv)  pursuant  to  a  public  offering  registration
statement, (v) in sales  in brokers' transactions, effected  on the NYSE or  any
other  securities exchange on which the Weatherford Voting Securities are listed
or in any other public trading market in which the Weatherford Voting Securities
are then being traded, in compliance with the provisions of Rule 144,  including
the  volume restrictions set forth in such  rule (excluding for purposes of this
clause (v) sales pursuant to the provisions of paragraph (k) of Rule 144,  which
sales  are included under  (vi)), (vi) sales  pursuant to paragraph  (k) of Rule
144, (vii) other  negotiated sales  of Weatherford Voting  Securities or  (viii)
pursuant  to the provisions of the Stockholders Agreement permitting, in certain
circumstances, sales into tender or exchange offers.

    During the  Term, the  First Reserve  Group has  further agreed  to not  (A)
dispose  of Weatherford Voting Securities pursuant  to clause (iv) above, unless
the First Reserve  Group members use  their reasonable best  efforts to  refrain
from  disposing of Weatherford Voting Securities  representing 3% or more of the
Combined Voting Power to any one person or group, (B) dispose of any Weatherford
Voting Securities pursuant  to clauses (iii),  (vi) and (vii)  above to any  one
person  or group if such  Weatherford Voting Securities represent  5% or more of
the Combined  Voting  Power or  (C)  dispose of  Weatherford  Voting  Securities
pursuant  to clauses (iii), (vi) and (vii) above to any one person or group who,
upon consummation  of  such  disposition would,  directly  or  indirectly,  have
beneficial  ownership  of  or  the  right  to  acquire  beneficial  ownership of
Weatherford Voting Securities representing  10% or more  of the Combined  Voting
Power.

    REGISTRATION  RIGHTS.  Commencing three months  after the Effective Time and
continuing for the rest of  the Term, Weatherford has agreed  to file, on up  to
four  occasions, at the  written request of the  holders of at  least 25% of the
"Registrable Securities" (defined as the Weatherford Common Stock issued to  the
First Reserve Funds in connection with the Merger and that are owned by a member
of the First Reserve Group) who seek to register at least 25% of the Registrable
Securities  then outstanding (or  a lesser percent  if the anticipated aggregate
offering price, net of underwriting discounts and commissions, would exceed  $25
million),  a  registration statement  under the  Securities Act  registering all
Registrable Securities that the holders of Registrable Securities request to  be
registered.  Once every 12 month period Weatherford will have the right to defer
such filing for a period of not more than 60 days if, in the good faith judgment
of a majority of  Weatherford's directors who were  not designated by the  First
Reserve  Group,  it  would be  materially  detrimental to  Weatherford  for such
registration statement to be filed.

    Any  holder  of  Registrable  Securities  that  intends  to  distribute  its
securities  pursuant  to  an  underwriting  will  be  permitted  to  include its
Registrable Securities only if such  holder includes its Registrable  Securities
in  the underwriting and enters into an underwriting agreement in customary form
with the  underwriter or  underwriters selected  by Weatherford  and  reasonably
acceptable to a majority in interest of the holders requesting registration.

    Any holder or holders of Registrable Securities representing at least 10% of
the  Registrable  Securities  then  outstanding  (or  a  lesser  percent  if the
anticipated aggregate offering  price, net of  discounts and commissions,  would
exceed $1 million) may request in writing that Weatherford effect a registration
on  Form  S-3 not  involving an  underwriting and  any related  qualification or
compliance with respect to all or a part of the Registrable Securities owned  by
such holder or holders.

    Weatherford  has also  agreed that,  if it  proposes to  file a registration
statement, on its  own behalf  or on  behalf of  stockholders exercising  demand
registration  rights, to register Weatherford  Common Stock under the Securities
Act in connection with  the public offering of  Weatherford Common Stock  solely
for cash (subject to certain exceptions), Registrable Securities may (subject to
certain limitations) be included in such registration upon request.

    Weatherford will pay all expenses incurred by or on behalf of Weatherford in
connection with the foregoing registrations unless, with respect to the "demand"
registrations, the registration request is

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<PAGE>
subsequently  withdrawn  at the  request of  the  holders of  a majority  of the
Registrable Securities to  be registered and  the holders of  a majority of  the
Registrable Securities do not agree to forfeit one of their registration rights.
In  no event  will Weatherford be  obligated to bear  underwriting discounts and
commissions and the fees and expenses of counsel to the selling stockholders.

    Weatherford has agreed to indemnify  each holder of Registrable  Securities,
the  affiliates of each holder and their respective directors, officers, general
and limited partners, agents and  representatives (and the directors,  officers,
affiliates  and controlling persons thereof), and each other person, if any, who
controls such holder within  the meaning of the  Securities Act or the  Exchange
Act,  against,  among  other  things,  certain  liabilities  arising  under  the
Securities Act in respect of  information concerning Weatherford included in  or
omitted   from  any  registration   statement  or  prospectus   covered  by  the
Stockholders Agreement, and the holders of Registrable Securities will similarly
indemnify Weatherford,  each of  its directors,  each of  its officers  who  has
signed  the registration statement, each  person who controls Weatherford within
the meaning  of  the  Securities  Act, any  underwriter,  any  other  holder  of
Registrable Securities selling securities in such registration statement and any
controlling  person of any such underwriter or other holder against, among other
things, liabilities under the Securities  Act in respect of written  information
supplied  by  such  holder  expressly  for  use  in  connection  with  any  such
registration statement or prospectus.

    Weatherford has agreed that, during the Term, it will not, without the prior
consent of the holders of a majority of the outstanding Registrable  Securities,
enter  into any agreement  with any holder or  prospective holder of Weatherford
securities that would allow  such holder or prospective  holder to include  such
securities  in any of the foregoing  registrations unless the agreement provides
that inclusion of such securities would not reduce the amount of the Registrable
Securities included in such registration.

CONDITIONS TO THE MERGER

    The Merger Agreement provides that the respective obligations of Weatherford
and Enterra to effect the  Merger are subject to  the satisfaction or waiver  of
the  following conditions:  (a) that the  Merger Agreement and  the Merger shall
have been approved  and adopted  by the requisite  vote of  the stockholders  of
Weatherford and the stockholders of Enterra as may be required by law and by any
applicable  provisions of their respective charters or bylaws; (b) that no order
shall have been entered and remain in effect in any action or proceeding  before
any  foreign, federal  or state court  or governmental agency  or other foreign,
federal or state regulatory  or administrative agency  or commission that  would
prevent   or  make  illegal  the  consummation  of  the  Merger;  (c)  that  the
Registration  Statement  shall  be  effective  on  the  Closing  Date,  and  all
post-effective amendments filed shall have been declared effective or shall have
been  withdrawn, and  no stop order  suspending the  effectiveness thereof shall
have been issued and no proceedings  for that purpose shall have been  initiated
or,  to the  knowledge of  the parties, threatened  by the  Commission; (d) that
there shall  have been  obtained any  and all  material permits,  approvals  and
consents  of securities or blue sky commissions  of any jurisdiction, and of any
other governmental body or  agency, that reasonably may  be deemed necessary  so
that  the consummation of  the Merger and  the transactions contemplated thereby
will be in  compliance with applicable  laws, the failure  to comply with  which
would  have a  material adverse effect  on the business,  financial condition or
results of operations  of Enterra and  its subsidiaries or  Weatherford and  its
subsidiaries,  taken as a whole; and (e)  that all approvals of private persons,
financial institutions or corporations, the  granting of which is necessary  for
the  consummation of the  Merger or the  transactions contemplated in connection
therewith and the non-receipt of which  would have a material adverse effect  on
the  business, financial condition  or results of operations  of Enterra and its
subsidiaries or Weatherford and its subsidiaries,  taken as a whole, shall  have
been obtained.

    The  Merger Agreement provides that the  obligation of Weatherford to effect
the Merger is, at the option of Weatherford, further subject to the satisfaction
or waiver  of  the  following  conditions:  (a)  that  the  representations  and
warranties   of   Enterra   contained   in   the   Merger   Agreement  regarding
capitalization, authorization and validity  of the Merger Agreement,  Commission
filings, financial statements

                                       52
<PAGE>
and   the  absence   of  brokers'  fees   shall  be  accurate,   and  the  other
representations and  warranties of  Enterra contained  in the  Merger  Agreement
shall  be accurate in all  material respects (except to  the extent qualified by
materiality,  in  which  case  such  representations  and  warranties  shall  be
accurate),  as of the Closing Date as though such representations and warranties
had been made at and  as of that time (except  where any such representation  or
warranty  is made as of a date specifically  set forth therein), and that all of
the terms, covenants and conditions of the Merger Agreement to be complied  with
and  performed by  Enterra on or  before the  Closing Date shall  have been duly
complied with  and performed  in all  material respects;  (b) that  no  material
adverse change in the business, operations or financial condition of Enterra and
its  subsidiaries, taken  as a whole  (except for  certain exclusions previously
agreed to by Weatherford and Enterra), shall have occurred; (c) that Weatherford
shall have been advised in writing as of the date of the Merger Agreement and as
of the Closing Date by Arthur Andersen LLP that Weatherford is eligible to be  a
party  to a  merger accounted for  as a  "pooling of interests"  and that Arthur
Andersen LLP is not aware  of any matters that prohibit  the use of "pooling  of
interests"  accounting in connection  with the Merger, and  by KPMG Peat Marwick
LLP that no conditions  exist that would  preclude Weatherford's accounting  for
the Merger as a "pooling of interests" as those conditions relate to Enterra, in
each  case  in  accordance  with generally  accepted  accounting  principles and
applicable rules and regulations of the Commission; (d) that Enterra shall  have
received,  and furnished  written copies to  Weatherford of,  agreements by each
person deemed to be an affiliate of Enterra confirming that such person will not
sell, transfer or otherwise  dispose of any shares  of Weatherford Common  Stock
received  pursuant to the Merger in violation of the Securities Act or the rules
and regulations promulgated thereunder, and will comply with the holding  period
requirement  necessary to  permit qualification  of the  Merger for  "pooling of
interests" accounting treatment; (e) that  Weatherford shall have received  from
Morgan,  Lewis & Bockius, counsel to Enterra, an opinion as to certain corporate
matters of  Enterra; (f)  that Weatherford  shall have  received a  copy of  the
"comfort  letter"  of KPMG  Peat Marwick  LLP in  form and  substance reasonably
satisfactory to Weatherford, together with a  letter from such firm in form  and
substance  reasonably satisfactory to Weatherford updating the comfort letter as
of a date within five  days prior to the Closing  Date and stating that  nothing
has come to its attention that would require any change in its comfort letter if
it  were required to  be dated and delivered  on the Closing  Date; (g) that the
Weatherford Board of Directors shall have received from Merrill Lynch a  written
opinion,  dated as of  the date of  the Merger Agreement,  in form and substance
reasonably satisfactory to  the Weatherford  Board of Directors,  to the  effect
that  the conversion rate  to be used in  the Merger was fair  to the holders of
Weatherford Common Stock from a financial point of view, and such opinion  shall
have  been confirmed in writing to such Board as of the date of this Joint Proxy
Statement/Prospectus and not subsequently withdrawn; (h) that Weatherford  shall
have  received  from Fulbright  & Jaworski  L.L.P.,  counsel to  Weatherford, an
opinion dated as of the  date of this Joint  Proxy Statement/ Prospectus to  the
effect  that (i) the Merger will be treated for federal income tax purposes as a
reorganization  within  the  meaning  of  Section  368(a)  of  the  Code,   (ii)
Weatherford  and Enterra will each be a  party to that reorganization within the
meaning of Section 368(b) of the  Code, and (iii) Weatherford and Enterra  shall
not recognize any gain or loss as a result of the Merger, and such opinion shall
not  have  been withdrawn  or modified  in  any material  respect; (i)  that the
Stockholders Agreement among Enterra, First Reserve and the First Reserve  Funds
shall  have been in full force and effect, and the stockholders of Enterra named
therein shall not be in breach of any of the material terms thereof, immediately
prior to  the  Closing Date;  and  (j) D.  Dale  Wood shall  have  entered  into
definitive agreements reflecting the terms of his agreements with Weatherford.

    The  Merger Agreement provides that the  obligation of Enterra to effect the
Merger is, at  the option  of Enterra, further  subject to  the satisfaction  or
waiver  of the following conditions: (a) that the representations and warranties
of Weatherford  contained  in  the Merger  Agreement  regarding  capitalization,
authorization   and  validity  of  the  Merger  Agreement,  Commission  filings,
financial statements and the absence of brokers' fees shall be accurate, and the
other representations  and warranties  of Weatherford  contained in  the  Merger
Agreement  shall  be accurate  in all  material respects  (except to  the extent
qualified by  materiality, in  which case  such representations  and  warranties
shall be

                                       53
<PAGE>
accurate),  as of the Closing Date as though such representations and warranties
had been made at and  as of that time (except  where any such representation  or
warranty  is made as of a date specifically  set forth therein), and that all of
the terms, covenants and conditions of the Merger Agreement to be complied  with
and  performed by Weatherford on or before the Closing Date shall have been duly
complied with  and performed  in all  material respects;  (b) that  no  material
adverse change in the business, operations or financial condition of Weatherford
and  its subsidiaries, taken as  a whole, shall have  occurred; (c) that Enterra
shall have been advised in writing as of the date of the Merger Agreement and as
of the Closing Date by Arthur Andersen LLP that Weatherford is eligible to be  a
party  to a  merger accounted for  as a  "pooling of interests"  and that Arthur
Andersen LLP is not aware  of any matters that prohibit  the use of "pooling  of
interests"  accounting in connection  with the Merger, and  by KPMG Peat Marwick
LLP that no conditions  exist that would  preclude Weatherford's accounting  for
the Merger as a "pooling of interests" as those conditions relate to Enterra, in
each  case  in  accordance  with generally  accepted  accounting  principles and
applicable rules and regulations of  the Commission; (d) that Weatherford  shall
have  received, and furnished  written copies to Enterra  of, agreements by each
person deemed to be an affiliate of Weatherford confirming that such person will
comply with the holding period requirement necessary to permit qualification  of
the  Merger for  "pooling of interests"  accounting treatment;  (e) that Enterra
shall have received from Fulbright & Jaworski L.L.P., counsel to Weatherford, an
opinion as to certain corporate matters  of Weatherford; (f) that Enterra  shall
have received a copy of the "comfort letter" of Arthur Andersen LLP, in form and
substance  reasonably satisfactory to Enterra, together  with a letter from such
firm in  form and  substance  reasonably satisfactory  to Enterra  updating  the
comfort  letter as  of a  date within five  days prior  to the  Closing Date and
stating that nothing has come to its attention that would require any change  in
its  comfort letter if it were required to be dated and delivered on the Closing
Date; (g) that the Enterra Board of Directors shall have received from Simmons a
written opinion, dated  as of  the date  of the  Merger Agreement,  in form  and
substance  reasonably satisfactory  to the  Enterra Board  of Directors,  to the
effect that the consideration  to be received by  the holders of Enterra  Common
Stock in the Merger was fair from a financial point of view to such holders, and
such  opinion shall have been reaffirmed in writing to such Board as of the date
of this Joint  Proxy Statement/Prospectus  and not  subsequently withdrawn;  (h)
that  Enterra  shall have  received  from Morgan,  Lewis  & Bockius,  counsel to
Enterra,  an   opinion   dated   as   of  the   date   of   this   Joint   Proxy
Statement/Prospectus  to  the effect  that (i)  the Merger  will be  treated for
federal income tax purposes  as a reorganization within  the meaning of  Section
368(a)  of the Code; (ii)  Weatherford and Enterra will each  be a party to that
reorganization within the meaning of Section  368(b) of the Code; and (iii)  the
stockholders  of Enterra shall not recognize any gain or loss as a result of the
Merger, other  than to  the extent  such stockholders  receive cash  in lieu  of
fractional shares, and such opinion shall not have been withdrawn or modified in
any  material respect;  (i) that  the shares of  Weatherford Common  Stock to be
issued upon consummation of the Merger  shall have been approved for listing  on
the  NYSE, subject to  official notice of  issuance; and (j)  that the change of
control agreements currently in effect between Weatherford and twelve  employees
of  Weatherford  shall be  amended to  remove a  provision that  would otherwise
permit each such  officer to voluntarily  terminate his or  her employment  with
Weatherford,  for any reason,  during a 30-day  period immediately following the
first anniversary following a change of control and receive the same benefits to
which such officer would have been entitled if such officer had been terminated.

REPRESENTATIONS AND WARRANTIES OF WEATHERFORD AND ENTERRA

    In  the  Merger  Agreement,  Weatherford  and  Enterra  have  made   various
representations and warranties relating to, among other things, their respective
businesses  and financial conditions, the accuracy of their various filings with
the Commission and their financial  statements contained therein, the status  of
various  employee benefit plans  and environmental matters,  the satisfaction of
certain  legal  requirements  for  the  Merger  and  the  existence  of  certain
litigation.  The representations  and warranties of  each of the  parties to the
Merger Agreement will expire upon consummation of the Merger.

                                       54
<PAGE>
CONDUCT OF BUSINESS OF WEATHERFORD AND ENTERRA PRIOR TO MERGER

    Pursuant to  the Merger  Agreement, Weatherford  agreed that,  prior to  the
Effective  Time, other than as expressly contemplated by the Merger Agreement or
as previously agreed by Enterra, or  unless Enterra shall otherwise provide  its
prior  written consent,  (a) the  business of  Weatherford and  its subsidiaries
shall be conducted only in, and Weatherford and its subsidiaries shall not  take
any  action except  in, the ordinary  course of business;  (b) Weatherford shall
not, and shall  not permit any  of its  subsidiaries to, (i)  split, combine  or
reclassify  any outstanding capital stock of Weatherford, or authorize, declare,
set aside or pay any dividend payable  in cash, stock, property or otherwise  in
respect  of  the  capital  stock  of  Weatherford,  (ii)  authorize  or  pay any
extraordinary bonuses to employees, (iii) grant  any stock options or rights  to
acquire  Weatherford Common Stock or common stock  of any of its subsidiaries to
any person or entity,  other than options to  purchase Weatherford Common  Stock
issued  pursuant to employee stock option  plans in amounts consistent with past
practice, (iv) authorize  or issue,  sell, pledge,  dispose of  or encumber  any
shares  of capital stock of Weatherford or,  except to Weatherford or any of its
wholly-owned subsidiaries, any subsidiary of Weatherford, other than pursuant to
existing Weatherford  options, (v)  sell,  pledge, dispose  of or  encumber  any
assets of Weatherford or any of its subsidiaries, other than (A) in the ordinary
course of business, (B) not relating to the borrowing of money, (C) with respect
to  purchase money security  interests or (D) with  respect to encumbered assets
acquired in connection with an  acquisition permitted under clause (viii),  (vi)
redeem,  purchase, acquire or offer to  acquire any shares of Weatherford Common
Stock,  (vii)  enter  into,  or  grant  any  material  change  in,   employment,
compensation,  benefit, severance, consulting or stay-bonus arrangements, (viii)
acquire any corporation,  partnership, other business  organization or  division
thereof  for a purchase price  in excess of $5  million or acquire corporations,
partnerships, other business organizations or divisions thereof for an aggregate
purchase price  in  excess  of  $15  million,  (ix)  enter  into  any  contract,
agreement,  commitment  or  arrangement other  than  in the  ordinary  course of
business, (x)  authorize any  capital expenditures  other than  in the  ordinary
course  of business, and in accordance with  a plan previously presented to, and
not rejected by, the Weatherford Board  of Directors, (xi) incur any  obligation
for borrowed money or purchase money indebtedness, whether or not evidenced by a
note,  bond, debenture or  similar instrument, except in  the ordinary course of
business, and in no event in excess of the unused credit available from time  to
time  under existing credit facilities of Weatherford, (xii) amend or propose to
amend the charter or bylaws of Weatherford  or any of its subsidiaries in  which
Weatherford, either directly or indirectly, has less than a 100% equity interest
or  (xiii) take, and Weatherford shall use its reasonable efforts to prevent any
of its affiliates from taking, any action that would prevent, including with the
passage  of  time,  the  Merger's  qualification  for  "pooling  of   interests"
accounting treatment or prevent the Merger from being treated for federal income
tax  purposes as a  reorganization within the  meaning of Section  368(a) of the
Code; (c) Weatherford shall  use all reasonable efforts  (i) to preserve  intact
its  business organization and  that of its subsidiaries  whose stock is pledged
under existing credit facilities, (ii) to maintain in effect any of its material
franchises, authorizations  or similar  rights and  those of  its  subsidiaries,
(iii)  to keep available the services of  its current officers and employees and
those of  its  subsidiaries, (iv)  to  preserve  the goodwill  of  those  having
material  business relationships with  Weatherford and its  subsidiaries, (v) to
maintain and keep its  material properties and those  of its subsidiaries in  as
good a repair and condition as presently exists, except for deterioration due to
ordinary  wear and tear and damage due to casualty, and (vi) to maintain in full
force and effect insurance  comparable in amount and  scope of coverage to  that
currently  maintained by it and its subsidiaries; and (d) Weatherford shall not,
and shall not permit any of its subsidiaries to, take any action that would,  or
that  reasonably could be expected to, result  in any of its representations and
warranties set  forth in  the Merger  Agreement becoming  untrue or  any of  the
conditions  to the  Merger not being  satisfied, and  Weatherford promptly shall
advise Enterra orally and in  writing of any change  or event having, or  which,
insofar  as reasonably can be foreseen, would have, a material adverse effect on
the business, financial condition  or results of  operations of Weatherford  and
its subsidiaries, taken as a whole.

                                       55
<PAGE>
    Pursuant  to  the  Merger  Agreement,  Enterra  agreed  that,  prior  to the
Effective Time, other than as expressly contemplated by the Merger Agreement  or
as  previously  agreed by  Weatherford,  or unless  Weatherford  shall otherwise
provide its  prior  written  consent,  (a)  the  business  of  Enterra  and  its
subsidiaries  shall be conducted only in, and Enterra and its subsidiaries shall
not take any  action except  in, the ordinary  course of  business; (b)  Enterra
shall  not, and shall not permit any  of its subsidiaries to, (i) split, combine
or reclassify any outstanding capital  stock of Enterra, or authorize,  declare,
set  aside or pay any dividend payable  in cash, stock, property or otherwise in
respect of the capital stock of Enterra, (ii) authorize or pay any extraordinary
bonuses to employees, (iii) grant any stock options or rights to acquire Enterra
Common Stock or common stock of any of its subsidiaries to any person or entity,
other than options to purchase Enterra Common Stock issued pursuant to  employee
stock  option plans in amounts consistent  with past practice, (iv) authorize or
issue, sell,  pledge, dispose  of or  encumber any  shares of  capital stock  of
Enterra  or,  except to  Enterra or  any of  its wholly-owned  subsidiaries, any
subsidiary of Enterra, other than pursuant to Enterra Options, (v) sell, pledge,
dispose of or encumber any assets of  Enterra or any of its subsidiaries,  other
than  (A) in the ordinary course of  business, (B) not relating to the borrowing
of money, (C)  with respect  to purchase money  security interests  or (D)  with
respect  to  encumbered  assets  acquired  in  connection  with  an  acquisition
permitted under  clause  (viii), (vi)  redeem,  purchase, acquire  or  offer  to
acquire  any shares  of Enterra  Common Stock,  (vii) enter  into, or  grant any
material change in, employment, compensation, benefit, severance, consulting  or
stay-bonus  arrangements,  (viii)  acquire any  corporation,  partnership, other
business organization or division thereof for  a purchase price in excess of  $5
million  or acquire corporations, partnerships,  other business organizations or
divisions thereof for an aggregate purchase price in excess of $15 million, (ix)
enter into any contract, agreement, commitment or arrangement other than in  the
ordinary  course of business, (x) authorize  any capital expenditures other than
in the ordinary  course of business,  and in accordance  with a plan  previously
presented  to, and not rejected  by, the Enterra Board  of Directors, (xi) incur
any obligation for borrowed money or purchase money indebtedness, whether or not
evidenced by  a note,  bond,  debenture or  similar  instrument, except  in  the
ordinary  course of  business, and in  no event  in excess of  the unused credit
available from time to time under  existing credit facilities of Enterra,  (xii)
amend  or  propose to  amend the  charter or  bylaws  of Enterra  or any  of its
subsidiaries in which Enterra,  either directly or indirectly,  has less than  a
100%  equity  interest or  (xiii)  take, and  Enterra  shall use  its reasonable
efforts to prevent  any of  its affiliates from  taking, any  action that  would
prevent,  including with  the passage  of time,  the Merger's  qualification for
"pooling of interests"  accounting treatment  or prevent the  Merger from  being
treated  for federal income tax purposes  as a reorganization within the meaning
of Section 368(a) of the Code; (c) Enterra shall use all reasonable efforts  (i)
to  preserve intact its business organization and that of its subsidiaries whose
stock is pledged under  existing credit facilities, (ii)  to maintain in  effect
any  of its material  franchises, authorizations or similar  rights and those of
its subsidiaries, (iii) to keep available  the services of its current  officers
and  employees and those of  its subsidiaries, (iv) to  preserve the goodwill of
those having material business relationships with Enterra and its  subsidiaries,
(v)  to maintain and keep its material  properties and those of its subsidiaries
in as good a repair and condition as presently exists, except for  deterioration
due  to ordinary wear and tear and damage  due to casualty, and (vi) to maintain
in full force and effect insurance comparable in amount and scope of coverage to
that currently maintained by it and its subsidiaries; and (d) Enterra shall not,
and shall not permit any of its subsidiaries to, take any action that would,  or
that  reasonably could be expected to, result  in any of its representations and
warranties set  forth in  the Merger  Agreement becoming  untrue or  any of  the
conditions  to the Merger not being satisfied, and Enterra promptly shall advise
Weatherford orally  and in  writing of  any change  or event  having, or  which,
insofar  as reasonably can be foreseen, would have, a material adverse effect on
the business, financial condition  or results of operations  of Enterra and  its
subsidiaries, taken as a whole.

CONDUCT OF BUSINESS OF THE COMBINED COMPANY FOLLOWING MERGER

    The  Surviving Corporation Board of Directors  will initially consist of ten
persons, five designees chosen  by the Weatherford Board  of Directors and  five
designees  chosen by the  Enterra Board of  Directors. The following individuals
have   been    chosen   as    designees   by    the   Weatherford    Board    of

                                       56
<PAGE>
Directors:  Thomas N.  Amonett, Philip Burguieres,  William E.  Greehey, John W.
Johnson and Robert K. Moses, Jr.  The following individuals have been chosen  as
designees  by the Enterra Board of Directors: John A. Hill, William E. Macaulay,
Robert L. Parker, Sr., R. Rudolph Reinfrank and Roger M. Widmann. Mr. Burguieres
will be Chairman  of the Board  of Directors of  the Surviving Corporation.  The
Surviving   Corporation's  Audit  Committee  will  consist  of  Messrs.  Amonett
(Chairman), Hill and Reinfrank, the Compensation and Stock Plans Committee  will
consist  of Messrs. Greehey (Chairman), Moses  and Widmann and the Executive and
Nominating Committee  will  consist  of Messrs.  Burguieres,  Johnson,  Macaulay
(Co-Chairman),  Moses (Co-Chairman) and Parker. See "Management -- Directors and
Executive Officers". If within two years after the Effective Time a designee for
one of the  parties shall decline  or be unable  to serve as  a director of  the
Surviving  Corporation,  the remaining  designees for  such party  may designate
another person to act  in such person's  stead, subject to  the approval of  the
other  party's designated  directors, which  approval shall  not be unreasonably
withheld. Each committee of  the Surviving Corporation  Board of Directors  will
have  at least one Enterra designee during the two years following the Effective
Time. Each Enterra designee to the Surviving Corporation Board of Directors will
be  covered  by  Weatherford's  Non-Employee  Director  Retirement  Plan,  which
provides  that prior  service on  the Enterra Board  of Directors  will count as
service for all purposes under such plan.

    The officers of  the Surviving Corporation  are expected to  consist of  the
officers  of Weatherford immediately prior to  the Effective Time and M. Timothy
Carey and Steven C. Grant, both of  whom are officers of Enterra. Each  director
and officer of the Surviving Corporation will hold office in accordance with the
Certificate of Incorporation and bylaws of the Surviving Corporation until their
respective   successors  are  duly  elected  or  appointed  and  qualified.  See
"Management -- Directors and Executive Officers".

NO SOLICITATION

    The Merger Agreement provides that Weatherford will not, and will not permit
any of its subsidiaries to, or authorize or permit any of its or their officers,
directors, employees, investment bankers, attorneys or other advisors, agents or
representatives to, directly or indirectly,  (a) solicit, initiate or  encourage
the  submission of, or enter into any agreement with respect to, any proposal or
offer from any person  (other than Enterra  or any affiliate  of Enterra) for  a
merger or other business combination, acquisition of a material amount of assets
of  Weatherford or acquisition of more than  30% of the outstanding voting stock
of Weatherford (each such transaction being referred to herein as a "Weatherford
Takeover Proposal"),  or  (b) participate  in  any discussions  or  negotiations
regarding,  or furnish to any person any information with respect to, the making
of any proposal that constitutes,  or may reasonably be  expected to lead to,  a
Weatherford  Takeover Proposal. Notwithstanding the foregoing, prior to the vote
of the  Weatherford  stockholders  for  approval  and  adoption  of  the  Merger
Agreement  and  the  Merger,  Weatherford  may  participate  in  discussions  or
negotiations with, or furnish information to,  a third party to the extent  that
the  Weatherford Board of Directors determines, in good faith after consultation
with outside counsel,  that failure  to take  such actions  could reasonably  be
expected  to  result  in a  breach  of  the Board's  fiduciary  obligations. Any
violation of  the restrictions  set  forth above  by  any officer,  director  or
employee  of Weatherford  or any of  its subsidiaries or  any investment banker,
attorney or other advisor,  agent or representative  of Weatherford, whether  or
not  such person  is purporting  to act on  behalf of  Weatherford or otherwise,
would be deemed to be a material breach of the Merger Agreement by  Weatherford.
If  the Weatherford Board of Directors  receives a Weatherford Takeover Proposal
that, in the exercise of its fiduciary obligations (as determined in good  faith
after  consultation with  outside counsel),  it determines  to be  a Weatherford
Superior Proposal (as hereinafter defined),  the Weatherford Board of  Directors
may withdraw or modify its approval or recommendation of the Merger Agreement or
the Merger and may thereafter terminate the Merger Agreement, in each case after
the  fifth business day  following Enterra's receipt  of written notice advising
Enterra that  the Weatherford  Board  of Directors  has received  a  Weatherford
Takeover  Proposal that it has determined to be a Weatherford Superior Proposal;
provided that Weatherford  may so  terminate the  Merger Agreement  only if  the
stockholders of Weatherford have

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<PAGE>
not  yet voted upon  the Merger and  Weatherford shall have  paid to Enterra $20
million. A "Weatherford Superior Proposal" shall mean any bona fide  Weatherford
Takeover  Proposal to  merge with  or acquire,  directly or  indirectly, all the
outstanding voting stock or all or substantially all the assets of  Weatherford,
and otherwise on terms that the Weatherford Board of Directors determines in its
good  faith  reasonable judgment  (based on  the written  advice of  a financial
advisor  of  nationally   recognized  reputation)  to   be  more  favorable   to
Weatherford's  stockholders  than  the  Merger.  Notwithstanding  the foregoing,
Weatherford may take and disclose to its stockholders a position contemplated by
Rule 14e-2(a) of the Exchange Act  with respect to tender offers, provided  that
Weatherford  does not withdraw or modify its position with respect to the Merger
or take any  action having  such effect or  approve or  recommend a  Weatherford
Takeover Proposal. Enterra may terminate the Merger Agreement if the Weatherford
Board  of Directors or any committee  thereof withdraws or modifies, or proposes
to withdraw  or  modify,  in  a  manner  adverse  to  Enterra  the  approval  or
recommendation  of the Weatherford  Board of Directors or  any such committee of
the Merger Agreement or the  Merger or takes any  action having such effect,  or
approves  or recommends,  or proposes to  approve or  recommend, any Weatherford
Takeover Proposal.

    The Merger Agreement provides that Enterra will not, and will not permit any
of its subsidiaries to,  or authorize or  permit any of  its or their  officers,
directors, employees, investment bankers, attorneys or other advisors, agents or
representatives  to, directly or indirectly,  (a) solicit, initiate or encourage
the submission of, or enter into any agreement with respect to, any proposal  or
offer  from any person (other than  Weatherford or any affiliate of Weatherford)
for a merger or other business combination, acquisition of a material amount  of
assets  of Enterra  or acquisition  of more than  30% of  the outstanding voting
stock of Enterra (each such transaction  being referred to herein as a  "Enterra
Takeover  Proposal"),  or (b)  participate  in any  discussions  or negotiations
regarding, or furnish to any person any information with respect to, the  making
of  any proposal that constitutes, or may  reasonably be expected to lead to, an
Enterra Takeover Proposal. Notwithstanding the  foregoing, prior to the vote  of
Enterra  stockholders for approval and adoption  of the Merger Agreement and the
Merger, Enterra may participate in discussions or negotiations with, or  furnish
information  to, a third party to the extent that the Enterra Board of Directors
determines, in good faith after consultation with outside counsel, that  failure
to  take such actions could reasonably be expected  to result in a breach of the
Board's fiduciary obligations. Any violation of the restrictions set forth above
by any officer, director or  employee of Enterra or  any of its subsidiaries  or
any  investment banker,  attorney or other  advisor, agent  or representative of
Enterra, whether or not such person is purporting to act on behalf of Enterra or
otherwise, would be deemed to  be a material breach  of the Merger Agreement  by
Enterra. If the Enterra Board of Directors receives an Enterra Takeover Proposal
that,  in the exercise of its fiduciary obligations (as determined in good faith
after consultation  with  outside  counsel),  it determines  to  be  an  Enterra
Superior  Proposal (as hereinafter defined), the  Enterra Board of Directors may
withdraw or modify its approval or recommendation of the Merger Agreement or the
Merger and may thereafter terminate the Merger Agreement, in each case after the
fifth business day  following Weatherford's receipt  of written notice  advising
Weatherford that the Enterra Board of Directors has received an Enterra Takeover
Proposal  that it  has determined to  be an Enterra  Superior Proposal; provided
that Enterra may so terminate the  Merger Agreement only if the stockholders  of
Enterra  have  not yet  voted upon  the Merger  and Enterra  shall have  paid to
Weatherford $20 million. An "Enterra Superior Proposal" shall mean any bona fide
Enterra Takeover Proposal to merge with or acquire, directly or indirectly,  all
the  outstanding voting stock or all or substantially all the assets of Enterra,
and otherwise on  terms that the  Enterra Board of  Directors determines in  its
good  faith  reasonable judgment  (based on  the written  advice of  a financial
advisor of nationally recognized reputation)  to be more favorable to  Enterra's
stockholders  than the Merger.  Notwithstanding the foregoing,  Enterra may take
and disclose to its stockholders a position contemplated by Rule 14e-2(a) of the
Exchange Act  with respect  to tender  offers, provided  that Enterra  does  not
withdraw  or modify its position  with respect to the  Merger or take any action
having such  effect  or  approve  or recommend  an  Enterra  Takeover  Proposal.
Weatherford may terminate the Merger Agreement if the Enterra Board of Directors
or  any  committee thereof  withdraws or  modifies, or  proposes to  withdraw or

                                       58
<PAGE>
modify, in a manner adverse to Weatherford the approval or recommendation of the
Enterra Board of Directors or any such committee of the Merger Agreement or  the
Merger  or takes any  action having such  effect, or approves  or recommends, or
proposes to approve or recommend, any Enterra Takeover Proposal.

    Pursuant to an agreement  entered into with  Weatherford, First Reserve  and
the  First Reserve Funds have agreed not  to directly or indirectly (i) solicit,
initiate or  encourage the  submission  of, or  enter  into any  agreement  with
respect  to, an Enterra Takeover Proposal  or (ii) participate in any discussion
or negotiation regarding, or furnish any person any information with respect to,
the making of any  proposal that constitutes, or  may reasonably be expected  to
lead to, an Enterra Takeover Proposal.

    Pursuant to a confidentiality agreement, dated May 12, 1995, Weatherford and
Enterra  each agreed, among  other things, that  for 18 months  from the date of
such agreement, neither party nor any of its respective affiliates would, absent
the prior consent of the other party, (i) purchase, offer or agree to  purchase,
or  announce an intention to purchase, directly or indirectly, any securities or
assets of the other  party; (ii) make,  or in any  way participate, directly  or
indirectly,  in any  solicitation of  proxies to  vote or  consents, or  seek to
advise or  influence  any  person with  respect  to  the voting  of  any  voting
securities  of  the other  party or  any subsidiary  thereof; (iii)  initiate or
support, directly or indirectly,  any stockholder proposal  with respect to  the
other  party;  (iv) directly  or indirectly  make  any public  announcement with
respect to, or submit a proposal for,  or offer of (with or without  conditions)
any  extraordinary transaction  involving the other  party or  its securities or
assets or any subsidiary thereof, or (v) form, join or in any way participate in
a group as defined in  Section 13(d)(3) of the  Exchange Act in connection  with
any of the foregoing.

PAYMENT IN THE EVENT OF AN ALTERNATIVE TRANSACTION

    Weatherford agreed to pay Enterra $20 million in immediately available funds
promptly upon the termination of the Merger Agreement if it is terminated (i) by
Enterra  or Weatherford due to the existence of a Weatherford Superior Proposal,
(ii) for any reason other  than a material breach  by Enterra and a  Weatherford
Takeover Proposal shall have been made and the stockholders of Weatherford shall
not  have approved the Merger or (iii) by Weatherford for failure to receive, or
the withdrawal  of, a  favorable opinion  from  Merrill Lynch  or because  of  a
material  adverse  change in  the business,  financial  condition or  results of
operations of Enterra and its subsidiaries, taken as a whole (except for certain
exclusions previously agreed  to by  Weatherford and Enterra),  or the  material
breach  (or, in  some cases,  a non-material  breach) by  Enterra of  any of its
representations, warranties, covenants, agreements  or obligations contained  in
the Merger Agreement, and, within six months after such termination, Weatherford
shall  have  entered into  a definitive  agreement with  any person  (other than
Enterra or  any  of its  affiliates)  with  respect to  a  Weatherford  Takeover
Proposal  that is more favorable to  Weatherford's stockholders than the Merger.
Enterra agreed to  pay Weatherford  $20 million in  immediately available  funds
promptly  upon termination  of the Merger  Agreement if the  Merger Agreement is
terminated (i) by  Weatherford or  Enterra due to  the existence  of an  Enterra
Superior  Proposal,  (ii)  for  any  reason  other  than  a  material  breach by
Weatherford and  an Enterra  Takeover  Proposal shall  have  been made  and  the
stockholders  of Enterra shall not have approved  the Merger or (iii) by Enterra
for failure to receive, or the  withdrawal of, a favorable opinion from  Simmons
or  because of a material adverse change in the business, financial condition or
results of operations of Weatherford and its subsidiaries, taken as a whole,  or
the material breach (or, in some cases, a non-material breach) by Weatherford of
any  of its  representations, warranties,  covenants, agreements  or obligations
contained  in  the  Merger  Agreement,   and,  within  six  months  after   such
termination,  Enterra shall  have entered into  a definitive  agreement with any
person (other than  Weatherford or  any of its  affiliates) with  respect to  an
Enterra  Takeover Proposal that is more favorable to Enterra's stockholders than
the Merger.

                                       59
<PAGE>
TERMINATION OR AMENDMENT OF MERGER AGREEMENT

    The Merger Agreement provides that it may be terminated at any time prior to
the Effective Time, whether  prior to or after  approval by the stockholders  of
Weatherford or the stockholders of Enterra: (a) by mutual consent of Weatherford
and  Enterra; (b) by  either Weatherford or  Enterra if the  Merger has not been
effected on or  before December 31,  1995; (c) by  Weatherford if Merrill  Lynch
withdraws  its written fairness opinion; (d) by Enterra if Simmons withdraws its
written fairness  opinion; (e)  by Weatherford  if a  final, unappealable  order
shall  have been entered  to restrain, enjoin or  otherwise prevent, or awarding
substantial damages in connection with,  a consummation of the Merger  Agreement
or the transactions contemplated in connection therewith, or there is pending by
any  governmental body any  suit challenging or seeking  to restrain or prohibit
the consummation of the Merger or any of the other transactions contemplated  by
the  Merger  Agreement  or  seeking  to  obtain  from  Enterra  or  any  of  its
subsidiaries any  damages that  are  material in  relation  to Enterra  and  its
subsidiaries,  taken as a whole;  (f) by Enterra if  a final, unappealable order
shall have been entered  to restrain, enjoin or  otherwise prevent, or  awarding
substantial  damages in connection with, a  consummation of the Merger Agreement
or the transactions contemplated in connection therewith, or there is pending by
any governmental body any  suit challenging or seeking  to restrain or  prohibit
the  consummation of the Merger or any of the other transactions contemplated by
the Merger  Agreement  or seeking  to  obtain from  Weatherford  or any  of  its
subsidiaries  any damages that  are material in relation  to Weatherford and its
subsidiaries, taken as  a whole;  (g) by either  Weatherford or  Enterra if  the
required  approval  of  the  stockholders  of  Enterra  or  the  stockholders of
Weatherford for the adoption and approval of the Merger and the Merger Agreement
is not received at their  respective stockholders' meetings; (h) by  Weatherford
if (i) since the date of the Merger Agreement, there has been a material adverse
change  in the business, financial condition or results of operations of Enterra
and its subsidiaries, taken as a whole (except for certain exclusions previously
agreed to  by Weatherford  and Enterra),  or (ii)  there has  been a  breach  by
Enterra  of a representation or warranty regarding capitalization, authorization
and validity of the Merger  Agreement, Commission filings, financial  statements
or  the absence of brokers' fees,  or there has been a  breach by Enterra of any
other representation  or  warranty contained  in  the Merger  Agreement  in  any
material  respect (except to the extent  qualified by materiality, in which case
such representations and warranties shall not have been breached in any respect)
by Enterra  or Enterra  fails to  perform in  any material  respect any  of  its
covenants,  agreements or obligations contained in  the Merger Agreement; or (i)
by Enterra if  (i) since  the date  of the Merger  Agreement, there  has been  a
material  adverse  change in  the business,  financial  condition or  results of
operations of Weatherford and its subsidiaries, taken as a whole, or (ii)  there
has  been  a breach  by Weatherford  of a  representation or  warranty regarding
capitalization, authorization and validity  of the Merger Agreement,  Commission
filings, financial statements or the absence of brokers' fees, or there has been
a breach by Weatherford of any other representation or warranty contained in the
Merger  Agreement in  any material  respect (except  to the  extent qualified by
materiality, in which case  such representations and  warranties shall not  have
been  breached in any respect)  or Weatherford fails to  perform in any material
respect any of its covenants, agreements or obligations contained in the  Merger
Agreement. The Merger Agreement also may be terminated as described under "-- No
Solicitation".

    The  Merger Agreement provides that it may  be amended or supplemented by an
instrument in writing  signed on  behalf of  each party  thereto, provided  that
after  the Merger Agreement has been approved and adopted by the stockholders of
Weatherford and the stockholders of  Enterra, it may be  amended only as may  be
permitted by applicable provisions of Delaware law.

INDEMNIFICATION

    The  Merger Agreement provides  that, after the  Effective Time, Weatherford
and the  Surviving Corporation  will  indemnify the  officers and  directors  of
Enterra  and any of  its subsidiaries against all  costs and expenses (including
reasonable  attorneys'  fees),  judgments,   fines,  losses,  claims,   damages,
liabilities and amounts paid in settlement in connection with any claim, action,
suit,  proceeding or  investigation, whether civil,  criminal, administrative or
investigative, based in whole or in part on, or

                                       60
<PAGE>
arising in whole  or in part  out of,  the fact that  such person is  or was  an
officer  or director, whether pertaining to  any matter existing or occurring at
or prior to the Effective Time and  whether asserted or claimed prior to, at  or
after  the Effective Time, as well as all  liabilities based in whole or in part
on, or  arising in  whole  or in  part  out of,  or  pertaining to,  the  Merger
Agreement,  the Merger or the transactions contemplated thereby. Pursuant to the
Merger Agreement,  for six  years  following the  Effective Time  the  Surviving
Corporation  is required to use its best  efforts to maintain in effect director
and officer  liability  insurance for  the  indemnified officers  and  directors
comparable  to that currently maintained by  Enterra; provided, however, that if
the Surviving Corporation is  unable to obtain such  insurance for an  aggregate
premium of $1 million or less, or if such insurance otherwise cannot be obtained
or  maintained,  then the  Surviving Corporation  will seek  to obtain  the best
possible coverage.

                                       61
<PAGE>
         COMPARATIVE RIGHTS OF STOCKHOLDERS OF WEATHERFORD AND ENTERRA

    The  rights of  holders of  Enterra Common  Stock are  currently governed by
Delaware law,  Enterra's Restated  Certificate  of Incorporation  and  Enterra's
By-laws,  as amended. Upon consummation of the Merger, holders of Enterra Common
Stock will  become holders  of Weatherford  Common Stock,  and their  rights  as
holders  of Weatherford Common Stock will still be governed by Delaware law, but
will then be governed by Weatherford's Restated Certificate of Incorporation and
Weatherford's By-laws, as amended. Set forth below are the principal differences
that could materially affect the rights of the holders of Enterra Common Stock.

SPECIAL VOTE REQUIRED FOR CERTAIN COMBINATIONS

    Section 203 of the Delaware General Corporation Law (the "DGCL") prohibits a
corporation from engaging in a  "business combination" (as hereinafter  defined)
with  an  "interested  stockholder" (defined  generally  to mean  a  person who,
together with his  affiliates, owns, or  if the  person is an  affiliate of  the
corporation  did own within the last three years, 15% or more of the outstanding
voting stock of the corporation) for a  period of three years after the date  of
the transaction in which the person became an interested stockholder, unless (i)
prior  to the date  of the business  combination, the board  of directors of the
corporation approved the business  combination or the  transaction in which  the
stockholder  became an interested stockholder, (ii)  as a result of the business
combination, the interested stockholder owned at  least 85% of the voting  stock
of the corporation outstanding at the time the transaction commenced or (iii) on
or  subsequent to the date  of the business combination,  the board of directors
and the holders of at least 66 2/3% of the outstanding voting stock not owned by
the interested stockholder approve the business combination. The DGCL defines  a
"business  combination" generally  as: (i)  a merger  or consolidation  with the
interested  stockholder  or  with  any  other  corporation  if  the  merger   or
consolidation  is caused  by the  interested stockholder,  (ii) a  sale or other
disposition to or  with an interested  stockholder of assets  with an  aggregate
market value greater than or equal to 10% or more of either the aggregate market
value  of all assets of the corporation or  the aggregate market value of all of
the outstanding stock  of the  corporation; (iii) with  certain exceptions,  any
transaction  resulting in  the issuance  or transfer  by the  corporation or any
majority-owned subsidiary of any stock of the corporation or such subsidiary  to
the  interested stockholder; (iv) any transaction involving the corporation or a
majority-owned subsidiary that  has the effect  of increasing the  proportionate
share  of  the stock  of the  corporation or  any such  subsidiary owned  by the
interested stockholder; or (v) any receipt by the interested stockholder of  the
benefit  of any loans or other financial benefits provided by the corporation or
any majority-owned subsidiary.

    The DGCL permits a corporation to elect  not to be governed by Section  203.
Both Enterra's By-laws and Weatherford's By-laws make such an election. However,
Weatherford's   Restated  Certificate  of   Incorporation  and  By-laws  contain
provisions  similar  to  Section  203  that  require  a  higher  percentage   of
stockholders'  vote to approve a  Business Combination (as hereinafter defined).
Pursuant to these provisions, an  "Interested Stockholder" is defined  generally
to mean the owner of more than 20% of the voting power of the outstanding voting
stock  and any  affiliate of  such person. The  holders of  at least  80% of the
voting power of  the then  outstanding shares  of capital  stock of  Weatherford
entitled  to  vote must  approve the  Business  Combination. The  term "Business
Combination" is defined generally to  include any of the following  transactions
in  which an Interested Stockholder is  involved: (i) a merger or consolidation,
(ii) a sale  or other disposition  of assets having  a fair market  value of  $1
million  or more, (iii) an issuance or  transfer of any securities having a fair
market value of $1 million or more, (iv) a plan of liquidation or dissolution or
(v)  certain  transactions  that  increase   the  proportionate  share  of   the
outstanding  shares of any class of equity or convertible securities owned by an
Interested Stockholder or any of its affiliates. The special stockholder  voting
requirement  of  the  fair price  provisions  is  not applicable  to  a Business
Combination if either (i) a majority of the Continuing Directors (as hereinafter
defined) approves the Business Combination  or (ii) certain minimum price,  form
of  consideration  and  procedural  requirements  are  satisfied.  Weatherford's
Restated Certificate of Incorporation generally defines "Continuing Director" to
mean a director who either (i) was unaffiliated with the Interested  Stockholder
and was a member of the Weatherford

                                       62
<PAGE>
Board  of Directors prior to the time  that the Interested Stockholder became an
Interested Stockholder or  (ii) was designated  in the appropriate  manner as  a
Continuing Director by the other Continuing Directors.

VOTE REQUIRED FOR EXTRAORDINARY CORPORATE TRANSACTIONS

    Under the DGCL, an amendment to a corporation's certificate of incorporation
requires  the affirmative vote of  the holders of a  majority of the outstanding
stock of  the  corporation  entitled to  vote  thereon  and a  majority  of  the
outstanding  stock of each class entitled to vote thereon as a class, unless the
corporation's certificate of incorporation provides for a higher percentage. The
DGCL also provides that the  holders of a majority  of the outstanding stock  of
the  corporation entitled to vote thereon may  approve an agreement of merger or
consolidation or the dissolution of a corporation.

    Enterra's  Restated  Certificate  of  Incorporation  contains  a   provision
requiring  that any corporate  action that is contingent  upon approval or other
action by the stockholders  (other than the election  of directors or  corporate
action  that has  been recommended  by a  vote of  three-quarters of  the entire
Enterra  Board  of  Directors),  including  amendments  to  Enterra's   Restated
Certificate  of  Incorporation,  be  authorized  only  upon  receiving  at least
three-quarters of the vote that all voting stockholders of Enterra, voting as  a
single  class, are entitled  to cast thereon.  If such action  is recommended by
three-quarters of  the  entire Enterra  Board  of Directors,  the  minimum  vote
required under the DGCL for such actions is required for stockholder approval.

    Weatherford's  Restated  Certificate  of  Incorporation  provides  that  the
affirmative vote  of  the holders  of  at least  80%  of the  outstanding  stock
entitled  to  vote  generally  in  the election  of  directors  is  required for
amendments to Weatherford's  Restated Certificate of  Incorporation relating  to
written  consents and special meetings of  stockholders, relating to the number,
election, terms,  increase in  the number,  vacancy, removal  and limitation  on
liability  of  directors, and  relating  to certain  mergers,  consolidations or
dissolutions of  Weatherford that  involve an  Interested Stockholder.  See  "--
Special Vote Required for Certain Business Combinations".

DISPOSITION OF ASSETS

    Under the DGCL, all sales, leases or exchanges of all, or substantially all,
of the assets of a corporation must be authorized by a resolution adopted by the
holders  of a majority of  the outstanding stock of  the corporation entitled to
vote thereon. Enterra's Restated Certificate  of Incorporation does not  provide
for  a  different  vote requirement  if  the  transaction has  been  approved by
three-fourths of the Enterra Board of  Directors. See "-- Special Vote  Required
for  Certain  Business  Combinations" for  a  description of  the  higher voting
requirement in connection with asset sales involving Business Combinations  with
Interested  Stockholders as  provided in  Weatherford's Restated  Certificate of
Incorporation and By-laws.

REMOVAL OF DIRECTORS

    The DGCL and Enterra's Restated  Certificate of Incorporation provide  that,
subject  to  the rights  of  the holders  of  any outstanding  shares  of Series
Preferred Stock,  directors of  Enterra may  only be  removed for  cause by  the
holders  of a  majority of the  shares then entitled  to vote at  an election of
directors. Weatherford's  Restated  Certificate  of  Incorporation  and  By-laws
provide  that, subject to the rights of the holders of any outstanding shares of
Serial Preferred Stock, no director may be removed from office, except for cause
and upon the affirmative vote of the holders of at least 80% of the  outstanding
stock entitled to vote for the election of directors.

STOCKHOLDER CONSENT IN LIEU OF MEETING

    Enterra's  By-laws provide that any action that may be taken at an annual or
special meeting may be taken without a meeting by written consent of the holders
of the minimum  stock otherwise required  to take  such action at  a meeting  of
stockholders.  Weatherford's Restated  Certificate of  Incorporation and By-laws
provide that any action  required or permitted to  be taken by the  stockholders
must be taken at a duly called annual or special meeting of the stockholders and
may not be taken by written consent.

                                       63
<PAGE>
DIRECTOR QUALIFICATION AND NUMBER

    The  DGCL provides  that the number  of directors of  a Delaware corporation
shall be fixed by, or in the manner provided in, the by-laws, unless such number
is changed  by action  of  the majority  of the  directors.  Under the  DGCL,  a
director  need not be  a stockholder to  be qualified unless  so required by the
charter or by-laws. Enterra's By-laws require written notice of a  stockholder's
intent  to nominate a director. As to the number of directors, Enterra's By-laws
provide for the  number of directors  to be not  less than three  nor more  than
twelve  and Weatherford's By-laws provide for the  number of directors to be not
less than six  nor more  than 15. Pursuant  to the  Stockholders Agreement,  the
Weatherford  Board of Directors will be set at  ten. See "Terms of the Merger --
Stockholders Agreement".

POWER TO CALL SPECIAL MEETINGS OF STOCKHOLDERS

    Under the DGCL, special meetings of stockholders may be called by the  board
of  directors  or  by  such  person  or persons  as  may  be  authorized  by the
certificate of incorporation  of by the  bylaws. Enterra's Restated  Certificate
and  By-laws provide that special meetings of  stockholders may be called by the
chairman, a  majority  of  the  board of  directors,  the  president  and  chief
executive,  or at the written  request of stockholders owning  a majority of the
stock that is issued  and outstanding and entitled  to vote. Upon such  request,
the  secretary shall fix the date  of the meeting at not  less than ten days nor
more  than  sixty  days   thereafter.  Weatherford's  Restated  Certificate   of
Incorporation  and By-laws provide that, unless otherwise prescribed by statute,
special meetings  of stockholders  of  Weatherford may  be  called only  by  the
Weatherford  Board of Directors pursuant to  a resolution approved by a majority
of the entire Weatherford Board of Directors.

                                       64
<PAGE>
                          MARKET PRICE OF COMMON STOCK

MARKET INFORMATION

    The Weatherford Common Stock and the Enterra Common Stock are traded on  the
NYSE  under the symbols "WII" and "EN", respectively. Prior to October 19, 1994,
the Weatherford Common Stock was traded on the American Stock Exchange, Inc. The
following table sets forth the range of high and low closing sale prices for the
Weatherford Common Stock and the Enterra Common Stock for the periods indicated,
as reported on the NYSE (or, in  the case of Weatherford, on the American  Stock
Exchange for periods prior to October 19, 1994).

<TABLE>
<CAPTION>
                                                          WEATHERFORD             ENTERRA
                                                      --------------------  --------------------
                                                        HIGH        LOW       HIGH        LOW
                                                      ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>
1993
  First Quarter.....................................  $    9.50  $    4.75  $   22.25  $   17.00
  Second Quarter....................................      13.75       8.75      29.00      20.25
  Third Quarter.....................................      12.88       9.25      26.38      21.00
  Fourth Quarter....................................      13.38       8.50      25.25      17.75

1994
  First Quarter.....................................      11.13       8.13      21.88      18.50
  Second Quarter....................................      14.75       8.00      23.75      18.25
  Third Quarter.....................................      14.00      11.63      23.88      20.00
  Fourth Quarter....................................      12.75       8.25      23.13      18.25

1995
  First Quarter.....................................      10.50       8.50      18.75      15.25
  Second Quarter....................................      12.75       9.75      21.00      16.00
  Third Quarter (through August 28, 1995)...........      13.88      11.88      22.63      19.88
</TABLE>

    On  June  23,  1995, the  last  trading  day prior  to  the  announcement by
Weatherford and  Enterra  that they  had  reached an  agreement  concerning  the
Merger,  the  closing sale  prices of  Weatherford Common  Stock and  of Enterra
Common Stock  as  reported  by  the  NYSE were  $11.50  and  $20.88  per  share,
respectively.

    On  August 28, 1995, the closing sale prices of Weatherford Common Stock and
of Enterra Common  Stock as  reported by  the NYSE  were $12.63  and $21.13  per
share, respectively.

    Following the Merger, Weatherford Common Stock will continue to be traded on
the NYSE under the symbol "WII". Following the Merger, Enterra Common Stock will
cease  to be traded  on the NYSE, and  there will be no  further market for such
stock.

DIVIDEND INFORMATION

    Weatherford has not  declared or  paid dividends on  the Weatherford  Common
Stock  since  December 1982  and  does not  anticipate  paying dividends  on the
Weatherford Common Stock  at any time  in the foreseeable  future. The terms  of
Weatherford's  credit  arrangements  with  its  banks  prohibit  the  payment by
Weatherford of cash dividends on the Weatherford Common Stock.

    Enterra has not declared or paid dividends on the Enterra Common Stock since
1984 and does not currently plan to declare or pay any dividends on the  Enterra
Common  Stock. In addition, Enterra's credit  agreement with its primary lenders
contains limitations on the amount of dividends that may be declared.

                                       65
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED
                   UNAUDITED PRO FORMA FINANCIAL INFORMATION

    The unaudited  pro  forma  financial  statements  are  based  upon  (i)  the
historical  consolidated financial statements of  Weatherford and Enterra, which
are incorporated  by reference  in this  Joint Proxy  Statement/Prospectus,  and
should  be read in conjunction with  those consolidated financial statements and
related  notes,  (ii)  the   unaudited  historical  consolidated  statement   of
operations  of the  Rental Division of  Odfjell Drilling  and Consulting Company
("Odfjell Rental") for the period from  January 1, 1994 through April 14,  1994,
(iii)  the unaudited  historical consolidated  statement of  operations of Total
Energy Services Company ("TOTAL")  for the period from  January 1, 1994  through
August  11, 1994, (iv) the unaudited historical combined balance sheet of Zapata
Energy Industries  as of  June  30, 1995  and  the audited  historical  combined
statement  of operations of Zapata Energy Industries for the eleven months ended
September 30, 1994, both  of which are incorporated  by reference in this  Joint
Proxy  Statement/Prospectus, and (v) the unaudited historical combined statement
of operations of  Zapata Energy  Industries for the  six months  ended June  30,
1995.

    The  Unaudited  Adjusted  Pro  Forma  Balance  Sheet  presents  the combined
financial position of Weatherford and Enterra as of June 30, 1995. The Unaudited
Adjusted Pro Forma Balance Sheet further assumes that the transactions set forth
in Enterra's June  29, 1995 contract  to acquire Zapata  Energy Industries  were
consummated as of June 30, 1995.

    The  Unaudited Pro  Forma Statements  of Operations  give effect  to (i) the
proposed Merger and  (ii) the Reverse  Stock Split by  combining the results  of
operations of Weatherford and Enterra for the six months ended June 30, 1995 and
1994  and for each of the three years in the period ended December 31, 1994 on a
"pooling of interests"  basis as if  Weatherford and Enterra  had been  combined
since  inception.  The Unaudited  Adjusted  Pro Forma  Statements  of Operations
further give effect  to (i)  the acquisition  by Weatherford  of Odfjell  Rental
under  the purchase  method of  accounting, (ii)  the acquisition  by Enterra of
TOTAL under the  purchase method of  accounting, (iii) the  consummation of  the
transactions  set forth  in Enterra's June  29, 1995 contract  to acquire Zapata
Energy Industries  under the  purchase  method of  accounting and  (iv)  certain
estimated operational and financial combination benefits of $26,800,000 per year
and  $8,668,000 per year resulting  from the Merger and  the consummation of the
transactions set forth  in Enterra's June  29, 1995 contract  to acquire  Zapata
Energy  Industries, respectively. The Unaudited Adjusted Pro Forma Statements of
Operations were  prepared assuming  that the  transactions itemized  above  were
consummated  as  of January  1, 1994.  No  provision has  been reflected  in the
unaudited pro forma financial  statements for direct cash  costs related to  the
Merger, which are expected to be approximately $28,300,000.

    The  Unaudited Pro Forma Financial Statements  have been prepared based upon
assumptions deemed  appropriate  by  Weatherford  and Enterra  and  may  not  be
indicative of actual results.

                                       66
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED

                   UNAUDITED ADJUSTED PRO FORMA BALANCE SHEET

                                 JUNE 30, 1995
                                 (IN THOUSANDS)

                                     ASSETS

<TABLE>
<CAPTION>
                                                        PRO FORMA      HISTORICAL
                                                     ----------------  -----------
                                                       WEATHERFORD       ZAPATA               PRO FORMA
                                                       AND ENTERRA       ENERGY     -----------------------------
                                                         COMBINED      INDUSTRIES   ADJUSTMENTS(2)    ADJUSTED
                                                     ----------------  -----------  --------------  -------------
<S>                                                  <C>               <C>          <C>             <C>
Current assets:
  Cash and cash equivalents........................  $      20,131     $     2,202   $    --        $      22,333
  Receivables, net.................................        238,078          10,198        --              248,276
  Inventories, net.................................        155,009          24,173        --              179,182
  Deferred tax assets and other....................         32,371         --             --               32,371
                                                     ----------------  -----------  --------------  -------------
    Total current assets...........................        445,589          36,573        --              482,162
                                                     ----------------  -----------  --------------  -------------
Property, plant and equipment......................      1,108,813          67,307         (7,810)      1,168,310
  Less -- Accumulated depreciation.................        653,396           7,810         (7,810)        653,396
                                                     ----------------  -----------  --------------  -------------
                                                           455,417          59,497        --              514,914
                                                     ----------------  -----------  --------------  -------------
Goodwill, net......................................        214,823          18,523         18,915         252,261
                                                     ----------------  -----------  --------------  -------------
Other assets.......................................         21,894           1,492        --               23,386
                                                     ----------------  -----------  --------------  -------------
Total assets.......................................  $   1,137,723     $   116,085   $     18,915   $   1,272,723
                                                     ----------------  -----------  --------------  -------------
                                                     ----------------  -----------  --------------  -------------

                                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Short-term debt and current portion of long-term
   debt............................................  $      17,568     $    27,228   $    (27,228)  $      17,568
  Accounts payable.................................         48,303           3,558         (3,558)         48,303
  Accrued liabilities..............................        106,676           4,743         (4,743)        106,676
                                                     ----------------  -----------  --------------  -------------
    Total current liabilities......................        172,547          35,529        (35,529)        172,547
                                                     ----------------  -----------  --------------  -------------
Long-term debt.....................................        185,986             763        135,000         320,986
                                                                                             (763)
                                                     ----------------  -----------  --------------  -------------
Deferred tax and other long-term liabilities.......         31,185          54,493        (54,493)         31,185
                                                     ----------------  -----------  --------------  -------------
Stockholders' equity:
  Common stock.....................................          5,067(1)            3             (3)          5,067
  Paid-in capital..................................        594,817(1)       20,787        (20,787)        594,817
  Retained earnings................................        152,095           4,510         (4,510)        152,095
  Cumulative translation adjustment................         (3,143)        --             --               (3,143)
  Treasury stock...................................           (831)        --             --                 (831)
                                                     ----------------  -----------  --------------  -------------
    Total stockholders' equity.....................        748,005          25,300        (25,300)        748,005
                                                     ----------------  -----------  --------------  -------------
Total liabilities and stockholders' equity.........  $   1,137,723     $   116,085   $     18,915       1,272,723
                                                     ----------------  -----------  --------------  -------------
                                                     ----------------  -----------  --------------  -------------
</TABLE>

The accompanying notes are an integral part of the unaudited pro forma financial
                                  statements.

                                       67
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED

                UNAUDITED PRO FORMA STATEMENTS OF OPERATIONS(3)

              FOR THE SIX MONTHS ENDED JUNE 30, 1995 AND 1994 AND
       FOR EACH OF THE THREE YEARS IN THE PERIOD ENDED DECEMBER 31, 1994
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                              SIX MONTHS
                                            ENDED JUNE 30,         YEAR ENDED DECEMBER 31,
                                         --------------------  -------------------------------
                                           1995       1994       1994       1993       1992
                                         ---------  ---------  ---------  ---------  ---------
Revenues...............................  $ 425,775  $ 269,939  $ 669,657  $ 493,206  $ 368,386
<S>                                      <C>        <C>        <C>        <C>        <C>
                                         ---------  ---------  ---------  ---------  ---------
Costs and expenses:
  Cost of sales and services...........    265,680    161,969    412,336    297,792    216,288
  Selling, general and administrative
   expenses............................     76,327     53,863    126,612     98,845     83,796
  Depreciation and amortization........     46,073     28,874     69,533     49,402     35,738
  Research and development.............      1,771      1,384      3,421      2,565      2,603
  Equity in earnings of unconsolidated
   affiliates..........................       (899)      (771)    (1,169)    (2,716)    (3,167)
  Foreign currency (gain) loss, net....       (969)    (2,027)    (2,205)       713        104
  Other (income) expense, net..........     (5,650)    (3,267)    (7,075)    (7,066)    (2,555)
  Acquisition-related costs............     --         --          2,500      4,000     --
  Unusual charges......................     28,281     --         --         --         --
                                         ---------  ---------  ---------  ---------  ---------
    Total costs and expenses...........    410,614    240,025    603,953    443,535    332,807
                                         ---------  ---------  ---------  ---------  ---------
Operating income.......................     15,161     29,914     65,704     49,671     35,579
  Interest expense.....................      8,255      2,269      8,847      4,027      3,026
  Interest income......................       (772)    (1,090)    (1,959)    (3,243)    (4,141)
                                         ---------  ---------  ---------  ---------  ---------
Income before taxes....................      7,678     28,735     58,816     48,887     36,694
  Income tax (benefit) provision,
   net.................................     (3,305)     7,790     16,958     13,635     10,292
                                         ---------  ---------  ---------  ---------  ---------
Net income before minority interests...     10,983     20,945     41,858     35,252     26,402
Minority interests.....................        311         66        119        (77)       358
                                         ---------  ---------  ---------  ---------  ---------
Net income.............................     11,294     21,011     41,977     35,175     26,760
Preferred dividends....................     --         --         --          1,153      1,538
                                         ---------  ---------  ---------  ---------  ---------
Net income to common shareholders......  $  11,294  $  21,011  $  41,977  $  34,022  $  25,222
                                         ---------  ---------  ---------  ---------  ---------
                                         ---------  ---------  ---------  ---------  ---------
Weighted average common and common
 equivalent shares outstanding.........     50,716     41,045     44,845     38,607     34,786
                                         ---------  ---------  ---------  ---------  ---------
                                         ---------  ---------  ---------  ---------  ---------
Income per common and common equivalent
 share(4)..............................  $    0.22  $    0.51  $    0.94  $    0.88  $    0.73
                                         ---------  ---------  ---------  ---------  ---------
                                         ---------  ---------  ---------  ---------  ---------
</TABLE>

The accompanying notes are an integral part of the unaudited pro forma financial
                                  statements.

                                       68
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED

              UNAUDITED ADJUSTED PRO FORMA STATEMENT OF OPERATIONS

                     FOR THE SIX MONTHS ENDED JUNE 30, 1995
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                  PRO FORMA                HISTORICAL          PRO FORMA
                                                    -------------------------------------  ----------   ------------------------
                                                                                                                       FURTHER
                                                                                                          ZAPATA       ADJUSTED
                                                    WEATHERFORD                              ZAPATA       ENERGY      FOR ZAPATA
                                                    AND ENTERRA                              ENERGY     INDUSTRIES      ENERGY
                                                     COMBINED     ADJUSTMENTS    ADJUSTED  INDUSTRIES   ADJUSTMENTS   INDUSTRIES
                                                    -----------   ------------   --------  ----------   -----------   ----------
<S>                                                 <C>           <C>            <C>       <C>          <C>           <C>
Revenues..........................................   $425,775     $  --          $425,775   $  34,923   $  --          $ 460,698
                                                    -----------   ------------   --------  ----------   -----------   ----------
Costs and expenses:
  Cost of sales and services......................    265,680        (9,554)(5)   256,126      25,289     (2,374)(6)     279,041
  Selling, general and administrative expenses....     76,327        (3,846)(5)    72,481       3,840     (1,960)(6)      74,361
  Depreciation and amortization...................     46,073        --            46,073       2,916        536(7)       49,525
  Research and development........................      1,771        --             1,771      --          --              1,771
  Equity in earnings of unconsolidated
   affiliates.....................................       (899)       --              (899)     --          --               (899)
  Foreign currency (gain) loss, net...............       (969)       --              (969)     --          --               (969)
  Other (income) expense, net.....................     (5,650)       --            (5,650)       (474)     --             (6,124)
  Unusual charges.................................     28,281        --            28,281      --          --             28,281
                                                    -----------   ------------   --------  ----------   -----------   ----------
    Total costs and expenses......................    410,614       (13,400)      397,214      31,571     (3,798)        424,987
                                                    -----------   ------------   --------  ----------   -----------   ----------
Operating income..................................     15,161        13,400        28,561       3,352      3,798          35,711
  Interest expense................................      8,255        --             8,255       1,650      2,974(8)       12,879
  Interest income.................................       (772)       --              (772)       (156)     --               (928)
                                                    -----------   ------------   --------  ----------   -----------   ----------
Income before taxes...............................      7,678        13,400        21,078       1,858        824          23,760
  Income tax (benefit) provision, net.............     (3,305)        4,690(5)      1,385         820        311(8)        2,516
                                                    -----------   ------------   --------  ----------   -----------   ----------
Net income before minority interests..............     10,983         8,710        19,693       1,038        513          21,244
Minority interests................................        311        --               311      --          --                311
                                                    -----------   ------------   --------  ----------   -----------   ----------
Net income........................................   $ 11,294     $   8,710      $ 20,004   $   1,038   $    513       $  21,555
                                                    -----------   ------------   --------  ----------   -----------   ----------
                                                    -----------   ------------   --------  ----------   -----------   ----------
Weighted average common and common equivalent
 shares outstanding...............................     50,716                      50,716                                 50,716
                                                    -----------                  --------                             ----------
                                                    -----------                  --------                             ----------
Income per common and common equivalent
 share(4).........................................   $   0.22                    $   0.39                              $    0.43
                                                    -----------                  --------                             ----------
                                                    -----------                  --------                             ----------
</TABLE>

The accompanying notes are an integral part of the unaudited pro forma financial
                                  statements.

                                       69
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED

              UNAUDITED ADJUSTED PRO FORMA STATEMENT OF OPERATIONS

                      FOR THE YEAR ENDED DECEMBER 31, 1994
                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                         PRO FORMA           HISTORICAL                     PRO FORMA
                                        -----------  --------------------------  --------------------------------
                                        WEATHERFORD
                                        AND ENTERRA     ODFJELL
                                         COMBINED       RENTAL         TOTAL        ADJUSTMENTS        ADJUSTED
                                        -----------  -------------  -----------  ------------------   -----------
                                                                     JANUARY 1
                                        YEAR ENDED   JANUARY 1 TO    TO AUGUST                        YEAR ENDED
                                        DECEMBER 31    APRIL 14         11                            DECEMBER 31
                                        -----------  -------------  -----------                       -----------
<S>                                     <C>          <C>            <C>          <C>                  <C>
Revenues..............................   $ 669,657     $   8,477     $ 146,390   $    --               $ 824,524
                                        -----------  -------------  -----------     ----------        -----------
Costs and expenses:
  Cost of sales and services..........     412,336         2,482       100,089         (19,108)(5)       495,799
  Selling, general and administrative
   expenses...........................     126,612         1,488        27,763          (7,692)(5)       146,261
                                                                                        (1,910)(10)
  Depreciation and amortization.......      69,533         1,301         7,833              (7)(11)       81,774
                                                                                         3,114(12)
  Research and development............       3,421        --            --            --                   3,421
  Equity in earnings of unconsolidated
   affiliates.........................      (1,169)       --            --            --                  (1,169)
  Foreign currency (gain), net........      (2,205)       --            --            --                  (2,205)
  Other (income) expense, net.........      (7,075)          (79)          517        --                  (6,637)
  Acquisition-related costs...........       2,500        --            --            --                   2,500
                                        -----------  -------------  -----------     ----------        -----------
    Total costs and expenses..........     603,953         5,192       136,202         (25,603)          719,744
                                        -----------  -------------  -----------     ----------        -----------
Operating income......................      65,704         3,285        10,188          25,603           104,780
  Interest expense....................       8,847        --             2,841             684(13)        12,295
                                                                                           (77)(14)
  Interest income.....................      (1,959)       --              (303)       --                  (2,262)
                                        -----------  -------------  -----------     ----------        -----------
Income before taxes...................      58,816         3,285         7,650          24,996            94,747
  Income taxes........................      16,958        --             2,586           9,380(5)         30,037
                                                                                           782(15)
                                                                                           331(16)
                                        -----------  -------------  -----------     ----------        -----------
Net income before minority
 interests............................      41,858         3,285         5,064          14,503            64,710
Minority interests....................         119        --               123        --                     242
                                        -----------  -------------  -----------     ----------        -----------
Net income............................   $  41,977     $   3,285     $   5,187   $      14,503         $  64,952
                                        -----------  -------------  -----------     ----------        -----------
                                        -----------  -------------  -----------     ----------        -----------
Weighted average common and common
 equivalent shares outstanding........      44,845                                       5,834(17)        50,679
                                        -----------                                 ----------        -----------
                                        -----------                                 ----------        -----------
Income per common and common
 equivalent share(4)..................   $    0.94                                                     $    1.28
                                        -----------                                                   -----------
                                        -----------                                                   -----------

<CAPTION>
                                             HISTORICAL                   PRO FORMA
                                        --------------------  ---------------------------------
                                                                               FURTHER ADJUSTED
                                                              ZAPATA ENERGY       FOR ZAPATA
                                           ZAPATA ENERGY        INDUSTRIES          ENERGY
                                             INDUSTRIES        ADJUSTMENTS        INDUSTRIES
                                        --------------------  --------------   ----------------

                                        ELEVEN MONTHS ENDED                       YEAR ENDED
                                            SEPTEMBER 30                         DECEMBER 31
                                        --------------------                   ----------------
<S>                                     <C>                   <C>              <C>
Revenues..............................  $       72,522        $   6,014(9)     $       903,060
                                              --------        --------------   ----------------
Costs and expenses:
  Cost of sales and services..........          52,768            5,080(9)             548,899
                                                                 (4,748)(6)
  Selling, general and administrative
   expenses...........................           6,917              390(9)             149,648
                                                                 (3,920)(6)
  Depreciation and amortization.......           4,867              490(9)              88,203
                                                                  1,072(7)
  Research and development............        --                 --                      3,421
  Equity in earnings of unconsolidated
   affiliates.........................        --                 --                     (1,169)
  Foreign currency (gain), net........        --                 --                     (2,205)
  Other (income) expense, net.........        --                   (221) (9)            (6,858)
  Acquisition-related costs...........        --                 --                      2,500
                                              --------        --------------   ----------------
    Total costs and expenses..........          64,552           (1,857)               782,439
                                              --------        --------------   ----------------
Operating income......................           7,970            7,871                120,621
  Interest expense....................           3,124            4,058(8)              19,477

  Interest income.....................        --                 --                     (2,262)
                                              --------        --------------   ----------------
Income before taxes...................           4,846            3,813                103,406
  Income taxes........................           2,049            1,408(8)              33,494

                                              --------        --------------   ----------------
Net income before minority
 interests............................           2,797            2,405                 69,912
Minority interests....................        --                 --                        242
                                              --------        --------------   ----------------
Net income............................  $        2,797        $   2,405        $        70,154
                                              --------        --------------   ----------------
                                              --------        --------------   ----------------
Weighted average common and common
 equivalent shares outstanding........                                                  50,679
                                                                               ----------------
                                                                               ----------------
Income per common and common
 equivalent share(4)..................                                         $          1.38
                                                                               ----------------
                                                                               ----------------
</TABLE>

The accompanying notes are an integral part of the unaudited pro forma financial
                                  statements.

                                       70
<PAGE>
                        WEATHERFORD AND ENTERRA COMBINED

               NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS

1.   The Unaudited Adjusted Pro Forma Balance Sheet as of June 30, 1995 reflects
    (i) the Reverse Stock  Split and (ii) the  issuance of 23,470,000 shares  of
    Weatherford  Common Stock in  exchange for all  27,775,000 shares of Enterra
    Common Stock outstanding at June 30, 1995, based upon the conversion rate of
    0.845  of  a  share  (which  also  reflects  the  Reverse  Stock  Split)  of
    Weatherford  Common  Stock  for  each share  of  Enterra  Common  Stock. The
    difference between the par value of Enterra Common Stock surrendered and the
    par value of Weatherford Common Stock issued upon consummation of the Merger
    is reflected as an increase in paid-in capital.

2.  To record borrowings used to finance the transactions set forth in Enterra's
    June 29, 1995 contract to acquire the assets of Zapata Energy Industries and
    to reflect the allocation of the related purchase price and to eliminate all
    liabilities and equity of Zapata Energy Industries, including $52,842,000 of
    intercompany payables, not being acquired by Enterra.

3.  There are  no significant adjustments required  to the historical  financial
    data of Weatherford or Enterra to conform the accounting policies of the two
    companies. Certain reclassifications have been made to historical amounts to
    conform  the financial presentation of  the two companies. Specifically, net
    proceeds from  involuntary  sales  of Enterra  oilfield  equipment  totaling
    $2,917,000  and $2,586,000 for the six-month periods ended June 30, 1995 and
    1994, respectively, and $4,900,000, $4,934,000 and $4,784,000 for the  years
    ended December 31, 1994, 1993 and 1992, respectively, have been reclassified
    from  revenues to other (income) expense,  net. In addition, with respect to
    Weatherford,  depreciation  and  amortization  charges  of  $21,831,000  and
    $16,712,000  for  the  six-month  periods  ended  June  30,  1995  and 1994,
    respectively, and  $36,429,000, $28,607,000  and $17,880,000  for the  years
    ended December 31, 1994, 1993 and 1992, respectively, have been reclassified
    from  cost  of  sales  and  services,  selling,  general  and administrative
    expenses and other (income) expense, net, to depreciation and amortization.

4.  The pro forma income per  common and common equivalent share is computed  on
    the  basis of the combined weighted average number of shares of common stock
    and common  stock equivalents  of Weatherford  (after giving  effect to  the
    Reverse  Stock Split) and  Enterra for each period  presented based upon the
    conversion rate of 0.845 of a share (which reflects the Reverse Stock Split)
    of Weatherford Common Stock  for each share of  Enterra Common Stock.  Fully
    diluted  earnings per share are  equal to primary earnings  per share in all
    periods presented.

5.   To record  certain  estimated consolidation  cost savings  and  operational
    efficiencies,  and  the  related  tax effect,  associated  with  the Merger,
    primarily resulting from  the combination of  certain service locations  and
    the elimination of duplicate corporate functions.

6.    To record  certain estimated  consolidation  cost savings  and operational
    efficiencies, and the related tax  effect, associated with the  transactions
    set  forth  in Enterra's  June 29,  1995 contract  to acquire  Zapata Energy
    Industries, primarily resulting  from the combination  of certain  locations
    and the elimination of duplicate corporate functions.

7.    To record  additional depreciation  expense  and amortization  of goodwill
    resulting from  the  allocation  of  the purchase  price  of  Zapata  Energy
    Industries.

8.   To record additional interest expense  on debt to be incurred in connection
    with the  transactions set  forth in  Enterra's June  29, 1995  contract  to
    acquire Zapata Energy Industries.

9.   To record  the results of  operations for Zapata  Energy Industries for the
    month of October 1993, a period prior to its purchase by Zapata.

10. To record  the cost  savings associated  with the  elimination of  salaries,
    benefits   and  related  costs  of  the  TOTAL  corporate  staff  and  other
    administrative personnel.

11. To adjust depreciation expense and record amortization of goodwill resulting
    from the allocation of the purchase price of Odfjell Rental by Weatherford.

                                       71
<PAGE>
12. To  record  additional depreciation  expense  and amortization  of  goodwill
    resulting from the allocation of the purchase price of TOTAL by Enterra.

13.  To record  interest expense on  debt incurred by  Weatherford in connection
    with its acquisition of Odfjell Rental.

14. To record interest cost savings associated with the lower effective interest
    rate on  debt incurred  by Enterra  in connection  with its  acquisition  of
    TOTAL, which debt replaced TOTAL's existing debt.

15.  To record income tax expense on Odfjell Rental operations and the effect of
    the Odfjell Rental adjustments discussed in Notes 11 and 13 above.

16. To record income tax expense on  the TOTAL operations and the effect of  the
    TOTAL adjustments discussed in Notes 10, 12 and 14 above.

17. To adjust weighted average shares outstanding as if the 11,300,000 shares of
    Enterra  Common  Stock issued  on  August 12,  1994  in connection  with the
    acquisition of TOTAL had been issued on  January 1, 1994 and to reflect  the
    conversion  rate (after  the Reverse  Stock Split)  of 0.845  of a  share of
    Weatherford Common Stock for each share of Enterra Common Stock to be issued
    in the Merger.

                                       72
<PAGE>
                      WEATHERFORD SELECTED FINANCIAL DATA

    The Selected Financial Data should be read in conjunction with Weatherford's
Consolidated  Financial Statements and the notes thereto, which are incorporated
by reference in this  Joint Proxy Statement/  Prospectus. See "Incorporation  of
Certain Documents by Reference".

<TABLE>
<CAPTION>
                                                SIX MONTHS
                                              ENDED JUNE 30,                     YEAR ENDED DECEMBER 31,
                                          ----------------------  -----------------------------------------------------
                                             1995        1994       1994       1993       1992      1991(1)     1990
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                               (UNAUDITED)
                                          ----------------------
<S>                                       <C>          <C>        <C>        <C>        <C>        <C>        <C>
                                                      (IN THOUSANDS EXCEPT PER SHARE AMOUNTS AND EMPLOYEES)
OPERATING RESULTS:
  Revenues:
    International.......................   $ 102,625   $  86,495  $ 186,445  $ 157,562  $ 140,239  $ 130,483  $ 116,455
    United States.......................      96,462      93,902    185,869    175,521     82,725     94,606    101,268
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
      Total.............................   $ 199,087   $ 180,397  $ 372,314  $ 333,083  $ 222,964  $ 225,089  $ 217,723
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
  Depreciation and amortization(2)......   $  21,831   $  16,712  $  36,429  $  28,607  $  17,880  $  20,781  $  22,008
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
  Operating income:
    International.......................   $  18,152   $  13,926  $  28,157  $  27,106  $  24,481  $  15,296  $   9,325
    United States.......................      11,423       9,907     17,243      9,857     (3,616)    (6,904)     5,748
    Corporate...........................      (1,876)        577       (397)    (3,633)    (1,139)    (7,721)      (720)
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
      Total.............................   $  27,699   $  24,410  $  45,003  $  33,330  $  19,726  $     671  $  14,353
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
  Income (loss) before extraordinary
   gain.................................   $  18,382   $  16,903  $  29,460  $  21,990  $  12,012  $  (7,983) $  10,152
  Extraordinary gain from debt
   settlement...........................      --          --         --         --         --         --          2,826
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss).....................   $  18,382   $  16,903  $  29,460  $  21,990  $  12,012  $  (7,983) $  12,978
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
DATA PER COMMON SHARE:
  Income (loss) before extraordinary
   gain.................................   $    0.34   $    0.31  $    0.54  $    0.42  $    0.25  $   (0.23) $    0.22
  Extraordinary gain from debt
   settlement...........................      --          --         --         --         --         --           0.08
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss).....................   $    0.34   $    0.31  $    0.54  $    0.42  $    0.25  $   (0.23) $    0.30
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                          -----------  ---------  ---------  ---------  ---------  ---------  ---------
OTHER DATA:
  Capital expenditures, excluding
   acquisitions.........................   $  24,786   $  16,094  $  50,607  $  23,875  $  13,196  $  24,726  $  20,668
  Number of employees...................       3,156       2,963      3,158      3,030      2,252      2,247      1,749
  Weighted average shares outstanding...      54,527      54,320     54,484     49,735     42,374     41,889     39,306
</TABLE>

<TABLE>
<CAPTION>
                                                                         DECEMBER 31,
                                                  ----------------------------------------------------------
                                   JUNE 30, 1995     1994        1993        1992        1991        1990
                                   -------------  ----------  ----------  ----------  ----------  ----------
                                    (UNAUDITED)
                                   -------------
<S>                                <C>            <C>         <C>         <C>         <C>         <C>
                                                       (IN THOUSANDS EXCEPT PERCENTAGES)
BALANCE SHEET DATA:
  Working capital.................. $    105,954  $   89,939  $  100,739  $   80,848  $   77,351  $   87,375
  Total assets.....................      459,831     453,963     354,798     219,568     224,597     226,549
  Long-term debt (including current
   portion)........................       73,645      71,963      21,151      28,281      31,340      34,743
  Stockholders' equity.............      304,548     282,200     246,819     139,625     136,115     144,635
  Total debt-to-total
   capitalization..................           19 %         20%          8%         17%         19%         19%
<FN>
- ------------------------------
(1)  Operating  results  for  1991 include  nonrecurring  operating  expenses of
     $4,544,000, $8,503,000 and $5,753,000  in the international, United  States
     and  corporate  segments, respectively,  and an  additional tax  accrual of
     $2,000,000 for a total  of $20,800,000 of  nonrecurring expenses, or  $0.50
     per common share.
(2)  Does not include amortization of deferred loan costs, which are included in
     interest  expense, totaling $755,000 and $681,000  for the six months ended
     June 30, 1995 and 1994, respectively, and $1,505,000 and $1,047,000 for the
     years ended December 31, 1994 and 1993, respectively.
</TABLE>

                                       73
<PAGE>
                        ENTERRA SELECTED FINANCIAL DATA

    The following selected  financial data  should be read  in conjunction  with
Enterra's Consolidated Financial Statements and related notes thereto, which are
incorporated   by  reference  in  this  Joint  Proxy  Statement/Prospectus.  See
"Incorporation of Certain Documents by Reference".

<TABLE>
<CAPTION>
                                               SIX MONTHS ENDED JUNE
                                                        30,                           YEAR ENDED DECEMBER 31,
                                               ----------------------  -----------------------------------------------------
                                                 1995(1)     1994(2)    1994(2)     1993       1992       1991       1990
                                               -----------  ---------  ---------  ---------  ---------  ---------  ---------
                                                    (UNAUDITED)
                                               ----------------------
<S>                                            <C>          <C>        <C>        <C>        <C>        <C>        <C>
                                                                  (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
OPERATING DATA
  Revenues...................................   $ 229,605   $  92,128  $ 302,243  $ 165,057  $ 150,206  $ 171,143  $ 141,447
  Operating income (loss)....................     (13,409)      5,031     20,455     14,423     15,853     30,373     18,581
  Income (loss) before income taxes and
   minority interests........................     (16,795)      5,992     18,654     18,045     18,507     34,295     23,277
  Net income (loss)..........................      (7,088)      4,108     12,517     13,185     14,748     22,217     18,221
  Net income (loss) per share................       (0.26)       0.25       0.60       0.81       0.92       1.40       1.21
OTHER DATA
  Capital expenditures, excluding
   acquisitions..............................   $  27,615   $  17,540  $  63,411  $  39,882  $  25,063  $  25,910  $  14,772
  Weighted average common shares
   outstanding...............................      27,755      16,432     20,832     16,260     16,094     15,916     15,056
  Cash dividends per common share............      --          --         --         --         --         --         --
</TABLE>

<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                    ----------------------------------------------------------
                                     JUNE 30, 1995     1994        1993        1992        1991        1990
                                     -------------  ----------  ----------  ----------  ----------  ----------
                                      (UNAUDITED)
                                     -------------
<S>                                  <C>            <C>         <C>         <C>         <C>         <C>
                                                                  (IN THOUSANDS)
BALANCE SHEET DATA:
  Working capital..................  $    167,088   $  161,839  $  111,095  $  116,678  $  120,528  $  102,581
  Property, plant and equipment,
   net.............................       235,012      247,143     118,917      98,275      84,290      71,808
  Total assets.....................       677,892      700,007     280,804     254,922     246,105     213,867
  Long-term debt...................       128,643      123,045      --          --          --          --
  Stockholders' equity.............       443,457      452,434     227,653     209,833     197,887     172,053
<FN>
- ------------------------------
(1)  Operating results for the six months ended June 30, 1995 include an unusual
     charge of $28.3 million ($0.52 per share) related to a writedown of  assets
     and  certain restructuring charges. See Note 4 of the Notes to Consolidated
     Financial Statements contained in Enterra's  Quarterly Report on Form  10-Q
     for the quarter ended June 30, 1995, which are incorporated by reference in
     this Joint Proxy Statement/Prospectus.

(2)  Operating  results for  1994 include the  results of  Total Energy Services
     Company from August 12,  1994 (the date of  its acquisition by Enterra)  to
     December  31,  1994. See  Note  2 of  the  Notes to  Enterra's Consolidated
     Financial Statements, contained in Enterra's Annual Report on Form 10-K for
     the year ended December  31, 1994, which are  incorporated by reference  in
     this Joint Proxy Statement/Prospectus.
</TABLE>

                                       74
<PAGE>
                                   MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS

    Set  forth below is certain information with respect to the persons that are
expected to serve as directors (including the year of the annual meeting of  the
stockholders  of the Surviving Corporation at which such director's current term
expires) and executive officers of the Surviving Corporation.

<TABLE>
<CAPTION>
NAME                            AGE       POSITION WITH WEATHERFORD OR ENTERRA      POSITION WITH SURVIVING CORPORATION
- --------------------------      ---      ---------------------------------------  ---------------------------------------
<S>                         <C>          <C>                                      <C>
Thomas N. Amonett.........          51   Director of Weatherford                  Director (term expires 1998)
Philip Burguieres.........          51   Chairman of the Board, President and     Chairman of the Board, President and
                                          Chief Executive Officer of Weatherford   Chief Executive Officer (term expires
                                                                                   1996)
William E. Greehey........          59   Director of Weatherford                  Director (term expires 1996)
John A. Hill..............          53   Director of Enterra                      Director (term expires 1997)
John W. Johnson...........          50   Director of Weatherford                  Director (term expires 1997)
William E. Macaulay.......          49   Director of Enterra                      Director (term expires 1997)
Robert K. Moses, Jr.......          55   Director of Weatherford                  Director (term expires 1998)
Robert L. Parker, Sr......          71   Director of Enterra                      Director (term expires 1998)
R. Rudolph Reinfrank......          40   Director of Enterra                      Director (term expires 1998)
Roger M. Widmann..........          55   Director of Enterra                      Director (term expires 1996)
James R. Burke............          57   Senior Vice President; President --      Senior Vice President
                                          Products Division of Weatherford
M. Timothy Carey..........          51   President of Enterra's Oilfield          Senior Vice President
                                          Services and Equipment Group
M. E. Eagles..............          55   Senior Vice President; President --      Senior Vice President
                                          Services Division of Weatherford
Steven C. Grant...........          53   Senior Vice President -- Corporate       Vice President
                                          Development of Enterra
Jon Nicholson.............          52   Director of Human Resources of           Vice President
                                          Weatherford
Norman W. Nolen...........          52   Senior Vice President, Chief Financial   Senior Vice President, Chief Financial
                                          Officer and Treasurer of Weatherford     Officer and Treasurer
H. Suzanne Thomas.........          41   Senior Vice President, Secretary and     Senior Vice President, Secretary and
                                          General Counsel of Weatherford           General Counsel
</TABLE>

    Mr. Amonett was first elected to  the Weatherford Board of Directors in  May
1974.  Mr.  Amonett  has  served  as  President  of  Reunion  Resources  Company
(previously called Buttes Gas and  Oil Company), a Houston, Texas-based  company
primarily  engaged in  oil and gas  exploration, development  and production and
wine grape vineyard development, since July  1992. Previously he was Of  Counsel
with  Fulbright  &  Jaworski  L.L.P., Attorneys  at  Law,  Houston,  Texas, from
September 1986 to July 1992. Prior thereto,  he was President and a director  of
Houston  Oil Fields Company, an oil  and gas exploration and production company,
from November 1982  to September 1986.  He served  as Chairman of  the Board  of
Weatherford  from May  1986 to  May 1989. He  also has  served as  a director of
PetroCorp, Inc., a Houston, Texas-based  company engaged in the exploration  and
production  of oil  and natural gas,  since November  1993 and as  a director of
Team, Inc., a  Houston, Texas-based company  engaged in environmental  services,
since October 1994.

    Mr.  Burguieres  was  elected  President  and  Chief  Executive  Officer  of
Weatherford effective April 3,  1991, a director effective  April 23, 1991,  and
Chairman of the Board effective December 10, 1992. From January 1990 to November
1990,  he was Chairman  of the Board,  President and Chief  Executive Officer of
Panhandle Eastern Corporation,  a company that  operates interstate natural  gas

                                       75
<PAGE>
transmission systems. From January 1987 to November 1989, he was Chairman of the
Board,  from January  1986 to November  1989, Chief Executive  Officer, and from
April 1981 to November 1989, President  and Chief Operating Officer, of  Cameron
Iron  Works, Inc., a Houston, Texas-based  company engaged in the manufacture of
oilfield  equipment.   Mr.  Burguieres   is  also   a  director   of   McDermott
International, Inc. and Texas Commerce Bancshares.

    Mr.  Greehey was first elected to the  Weatherford Board of Directors in May
1984. Mr. Greehey is Chairman of the Board and Chief Executive Officer of Valero
Energy Corporation, a San Antonio, Texas-based company that refines, trades  and
markets oil and gas and manages natural gas transmission operations. He also has
been  a  director of  Santa Fe  Energy Resources,  Inc., a  Houston, Texas-based
company engaged in oil and gas exploration and production, since March 1991.

    Mr. Hill was appointed to the Enterra Board of Directors in August 1994.  He
served  as a director of TOTAL from  June 1993 until its acquisition by Enterra.
Mr. Hill has been Chairman of the Board of First Reserve since 1983. Mr. Hill is
a trustee of  the Putnam  Funds and  is a  director of  Snyder Oil  Corporation,
Maverick  Tube Corporation and PetroCorp, Inc.,  the last two being companies in
which certain of the First Reserve Funds have a substantial equity interest.

    Mr. Johnson was appointed to the Weatherford Board of Directors in  November
1991.  Mr. Johnson is President  and a director of  Permian Mud Service, Inc., a
Houston, Texas-based  company that  manufactures and  sells oilfield  production
chemicals.  He was a  director of Petco  from March 1971  to November 1991, when
Petco was acquired by merger with Weatherford. He has also served as Chairman of
the Board  of Southwest  Bank of  Texas, N.A.,  a Houston,  Texas-based  banking
organization, since October 1982.

    Mr. Macaulay was appointed a director and Vice Chairman of Enterra in August
1994.  He served as a director of TOTAL  from June 1993 until its acquisition by
Enterra. Mr. Macaulay has  been President and Chief  Executive Officer of  First
Reserve  since 1983. Mr. Macaulay is a director of Maverick Tube Corporation and
Hugoton Energy Corporation, each being a  company in which certain of the  First
Reserve Funds have a substantial equity interest.

    Mr.  Moses was first  elected to the  Weatherford Board of  Directors in May
1978. Mr.  Moses  is  a  private  investor,  principally  in  the  oil  and  gas
exploration  and oilfield  services business,  in Houston,  Texas. He  served as
Chairman of the Board of Weatherford from May 1989 to December 1992.

    Mr. Parker has served as Chairman of Parker Drilling Company, which provides
contract drilling services worldwide to the oil and natural gas industry,  since
1977.  From 1977 to December 1991, he  also served as Chief Executive Officer of
that company. He was first elected a director of Enterra in 1980. Mr. Parker  is
also  a director  of Bank of  Oklahoma Finance Corporation,  Tulsa, N.A., MAPCO,
INC. and Clayton Williams Energy, Inc.

    Mr. Reinfrank  has been  Managing  Director of  the  Davis Companies  and  a
Managing  General Partner of Davis  Reinfrank Company, private investment firms,
since May 1993. From January 1988 through June 1993, Mr. Reinfrank was Executive
Vice President of  Shamrock Holdings,  Inc. From January  1990 through  December
1992,  Mr. Reinfrank also served as Managing Director of Trefoil Investors, Inc.
and Shamrock Capital Advisors,  Inc. Mr. Reinfrank was  appointed a director  of
Enterra  in September 1992. He  previously served as a  director of Enterra from
1987 through 1991. Mr. Reinfrank is also a director of Parker Drilling Company.

    Mr. Widmann was appointed a director of Enterra in August 1994. He served as
a director of TOTAL  from September 1993 until  its acquisition by Enterra.  Mr.
Widmann  has  held  various  positions  with Chemical  Bank  since  1986  and is
currently Senior Managing Director of Corporate Finance for Chemical  Securities
Inc.  Mr. Widmann is  a director of  Lydall, Inc. and  a member of  the Board of
Advisors of various First Reserve funds.

    Mr. Burke  was  elected Senior  Vice  President, Corporate  Development  and
Marketing  of Weatherford effective  December 12, 1991  and became President and
General Manager of the Weatherford

                                       76
<PAGE>
Products Division effective March 1, 1994. From December 1989 to December  1991,
he was an independent management consultant. From June 1983 to December 1989, he
was  Vice President  of Corporate  Development, and  from 1976  to 1983,  he was
General Manager of a manufacturing operation, of Cameron Iron Works, Inc.

    Mr. Carey has been  President of Enterra's  oilfield services and  equipment
group  since  February 1992.  From  March 1991  to  February 1992  he  served as
President and  Chief Operating  Officer of  CRC-Evans. From  April 1987  through
February  1991, he served  as Executive Vice  President of that  company and its
predecessor.

    Mr. Eagles,  who joined  Weatherford  on March  1,  1993 as  Executive  Vice
President  and  President  and General  Manager  of the  Weatherford  Rental and
Fishing Tool Division, became Senior Vice President of Weatherford and President
and General  Manager of  the Weatherford  Services Division  effective March  1,
1994.  From  June  1992 until  March  1993,  Mr. Eagles  served  as  Senior Vice
President of  McDermott Inc.,  a marine  engineering construction  company,  and
President  of McDermott Energy Services Inc., and, from November 1990 until June
1992, he served as Vice President of Marketing of McDermott Inc. Prior  thereto,
Mr. Eagles was employed by Cameron Iron Works, Inc. for over 30 years and served
as Vice President of Sales and Marketing from October 1981 until November 1990.

    Mr.  Grant joined Enterra as its Senior  Vice President -- Finance and Chief
Financial Officer in January 1988 and became Senior Vice President --  Corporate
Development in March 1991.

    Mr.  Nicholson  joined Weatherford  as its  Director  of Human  Resources in
February 1993. From  March 1992  until January 1993,  he was  a human  resources
consultant.  From July 1990 until March  1992, Mr. Nicholson served as President
of Atlas Bradford Corporation, an  oilfield services company, and from  December
1988  until June 1990, he served as  Vice President of Human Resources of Baroid
Corporation, an oil services company.

    Mr. Nolen was  elected Senior  Vice President, Chief  Financial Officer  and
Treasurer  of Weatherford  effective April  29, 1991.  From March  1990 to April
1991, he  was  Vice  President  and Chief  Financial  Officer  of  Petro  Source
Corporation,  an  oil  gathering and  marketing  company. From  October  1980 to
February 1990, he was Corporate Treasurer of Cameron Iron Works, Inc.

    Ms. Thomas, who joined Weatherford in  January 1982 as Counsel, was  elected
Secretary  in March 1986,  Vice President and  General Counsel in  July 1987 and
Senior Vice President in December 1989. Ms. Thomas assumed responsibilities  for
Human  Resources, effective January  1, 1992. Prior  to joining Weatherford, Ms.
Thomas was an attorney with the law firm of Baker & Botts from September 1978 to
December 1981.

    The Surviving Corporation's Audit Committee will consist of Messrs.  Amonett
(Chairman),  Hill and Reinfrank, the Compensation and Stock Plans Committee will
consist of Messrs. Greehey (Chairman), Moses  and Widmann and the Executive  and
Nominating  Committee  will  consist of  Messrs.  Macaulay  (Co-Chairman), Moses
(Co-Chairman), Burguieres, Johnson and Parker.

STOCK OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

    WEATHERFORD.   The  following  table sets  forth  certain  information  with
respect  to Weatherford  Common Stock beneficially  owned as of  the Record Date
(except as otherwise noted) by  (i) persons who are  known to Weatherford to  be
the  beneficial owners of 5%  or more of Weatherford  Common Stock, (ii) each of
the five highest paid executive officers of Weatherford during 1995, (iii)  each
director  of Weatherford, and  (iv) all Weatherford officers  and directors as a
group, including pro forma information for such persons assuming that the Merger
had  been  consummated  at  such  date.   For  purposes  of  this  Joint   Proxy
Statement/Prospectus,  beneficial ownership  is defined  in accordance  with the
rules of  the Commission  to mean  generally the  power to  vote or  dispose  of
shares, regardless of any

                                       77
<PAGE>
economic  interest therein. The  persons listed have sole  voting power and sole
dispositive power  with respect  to all  shares set  forth in  the table  unless
otherwise  specified in the footnotes  to the table. The  table does not reflect
the Reverse Stock Split.

<TABLE>
<CAPTION>
                                                               SHARES OWNED                   PERCENT OWNED
                                                               DIRECTLY OR     PERCENT OF     FOLLOWING THE
NAME AND ADDRESS                                              INDIRECTLY(1)(2)    CLASS           MERGER
- ------------------------------------------------------------  --------------  ------------  ------------------
<S>                                                           <C>             <C>           <C>
FMR Corp. and Edward C. Johnson 3d (3) .....................      5,237,133          9.6%          9.95%(4)
 82 Devonshire Street
 Boston, MA 02109
Jurika & Voyles, Inc. (5) ..................................      3,703,706          6.8%           3.7%
 1999 Harrison Street, Suite 700
 Oakland, CA 94612
Thomas N. Amonett (6) ......................................         24,151        *                *
Thomas C. Brown (6) ........................................         22,576        *                *
Philip Burguieres (7) ......................................        436,528        *                *
J. Kelly Elliott ...........................................          6,660        *                *
William E. Greehey (6) .....................................         40,176        *                *
John W. Johnson (6)(8) .....................................        161,343        *                *
Robert K. Moses, Jr. (6)(9) ................................        897,741          1.7%           *
W. Randolph Smith (6)(10) ..................................        113,330        *                *
James R. Burke (11) ........................................         70,421        *                *
M.E. Eagles (12) ...........................................         51,793        *                *
Norman W. Nolen (13) .......................................         68,911        *                *
H. Suzanne Thomas (14) .....................................        106,775        *                *
All directors and executive officers as a group (12 in
 number) ...................................................      2,000,406          3.7%           2.0%
<FN>
- ------------------------
 *   Denotes ownership of less than one percent.
(1)  Information with respect to beneficial ownership is based upon  information
     furnished  by  each  stockholder  or contained  in  filings  made  with the
     Commission.
(2)  Includes shares held  under Weatherford's Employee  Stock Purchase Plan  in
     the  accounts of  participants, as to  which shares  such participants have
     sole voting power  and no  dispositive power  prior to  withdrawal of  such
     shares  from  such  plan. Shares  may  be  withdrawn from  such  plan  by a
     participant  on  March  31  of  each  year  upon  written  notice  by  such
     participant.  Also includes shares held  under Weatherford's 401(k) Savings
     Plan in the accounts of participants, as to which shares such  participants
     have  sole voting  and dispositive power.  Also includes  shares subject to
     acquisition within 60 days of the Record Date by such person or group.
(3)  Based upon information contained in Amendment No. 4 to a joint Schedule 13G
     dated February 13, 1995, filed with the Commission by Edward C. Johnson  3d
     and  FMR  Corp.,  on  behalf  of  itself  and  its  subsidiaries,  Fidelity
     Management &  Research Company  (beneficial owner  of 3,617,800  shares  of
     Weatherford  Common  Stock),  Fidelity  American  Special  Situations Trust
     (beneficial owner of 46,000 shares  of Weatherford Common Stock),  Fidelity
     Management   Trust  Company  (beneficial  owner   of  1,619,333  shares  of
     Weatherford Common Stock)  and Fidelity  International Limited  (beneficial
     owner  of 46,000  shares of  Weatherford Common  Stock). FMR  Corp. and Mr.
     Johnson each has sole dispositive  power with respect to 5,237,133  shares.
     FMR  Corp. has sole voting power with  respect to 1,603,733 shares, and Mr.
     Johnson has sole voting power with respect to none of the shares.
(4)  This percentage also reflects the shares of Weatherford Common Stock to  be
     received  in the  Merger by  the indicated stockholder  as a  result of the
     conversion of Enterra Common Stock currently held by such stockholder.
</TABLE>

                                       78
<PAGE>
<TABLE>
<S>  <C>
(5)  Based upon information contained in a Schedule 13G dated February 27, 1995,
     filed with the  Commission. Jurika  & Voyles, Inc.  has shared  dispositive
     power with respect to 3,703,706 shares and shared voting power with respect
     to 3,553,606 shares.
(6)  Includes 5,000 shares subject to acquisition by the director within 60 days
     of  the Record Date  pursuant to Weatherford's  Non-Employee Director Stock
     Option Plan.
(7)  Includes (a) 2,000  shares held by  Mr. Burguieres' wife,  with respect  to
     which  he has no voting or dispositive  power, (b) 1,000 shares held by Mr.
     Burguieres as custodian for his minor  child, with respect to which he  has
     sole  voting  and  dispositive power,  and  (c)  1,000 shares  held  by Mr.
     Burguieres' adult  child,  with  respect  to which  he  has  no  voting  or
     dispositive  power; Mr.  Burguieres disclaims  beneficial ownership  of all
     such shares.  Also includes  (a) 60,500  shares granted  to Mr.  Burguieres
     pursuant  to the Restricted Plan  with respect to which  he has sole voting
     power  and  no  dispositive  power,  and  (b)  180,000  shares  subject  to
     acquisition  by Mr. Burguieres  within 60 days pursuant  to the 1991 Option
     Plan.
(8)  Does not  include  2,305,755 shares  owned  by Permian  Mud  Service,  Inc.
     ("Permian")  as of the Record Date. Mr.  Johnson is a director, officer and
     substantial beneficial shareholder of Permian  and therefore may be  deemed
     to be a beneficial owner of the shares of the Common Stock held by Permian;
     Mr. Johnson disclaims beneficial ownership of all such shares. Includes (a)
     12,000  shares held by Mr.  Johnson as a trustee  of various trusts for his
     children, with respect to which he  has sole voting and dispositive  power,
     and  (b)  240 shares  held as  custodian for  Mr. Johnson's  children, with
     respect to which  he has  sole voting  and dispositive  power; Mr.  Johnson
     disclaims beneficial ownership of all such shares.
(9)  Includes  (a) 1,250 shares held  by Mr. Moses' adult  son supported by him,
     with respect to which Mr. Moses has no voting or dispositive power, and (b)
     an aggregate  of  90,000 shares  held  in  various trusts  for  Mr.  Moses'
     children,  his brother and his  sister, of which Mr.  Moses is the trustee,
     with respect to which Mr. Moses has sole voting and dispositive power;  Mr.
     Moses  disclaims beneficial ownership of all  such shares. Does not include
     (a) an aggregate of  105,000 shares held in  various trusts for Mr.  Moses'
     children,  of which shares Mr. Smith, a director of Weatherford, has shared
     voting and dispositive power as a co-trustee, and (b) 3,703 shares in trust
     for Mr. Moses' adult son, of which shares Mr. Moses' ex-wife is trustee and
     with respect to which Mr. Moses  has no voting or dispositive power;  since
     Mr.  Moses is not a trustee of such trusts and has no voting or dispositive
     power, he disclaims beneficial ownership of all such shares.
(10) Includes 105,000 shares held by Mr.  Smith as co-trustee of various  trusts
     for  the children of Mr. Moses, a  director of Weatherford, with respect to
     which Mr. Smith has  shared voting and dispositive  power; since Mr.  Smith
     has  no  relationship  to  the  beneficiaries of  the  trusts  by  blood or
     marriage, he disclaims beneficial ownership of all such shares.
(11) Includes (a) 17,326 shares granted to Mr. Burke pursuant to the  Restricted
     Plan  with respect  to which  he has sole  voting power  and no dispositive
     power, and (b) 25,000 shares subject to acquisition by Mr. Burke within  60
     days pursuant to the 1991 Option Plan.
(12) Includes (a) 20,850 shares granted to Mr. Eagles pursuant to the Restricted
     Plan  with respect  to which  he has sole  voting power  and no dispositive
     power, and (b) 16,666 shares subject to acquisition by Mr. Eagles within 60
     days pursuant to the 1991 Option Plan.
(13) Includes (a) 13,326 shares granted to Mr. Nolen pursuant to the  Restricted
     Plan  with respect  to which  he has sole  voting power  and no dispositive
     power, and (b) 31,833 shares subject to acquisition by Mr. Nolen within  60
     days  pursuant to  Weatherford's 1987 Stock  Option Plan  (the "1987 Option
     Plan") and 1991 Option Plan.
(14) Includes (a) 13,326 shares granted to Ms. Thomas pursuant to the Restricted
     Plan with respect  to which she  has sole voting  power and no  dispositive
     power, and (b) 32,333 shares subject to acquisition by Ms. Thomas within 60
     days pursuant to the 1987 Option Plan and 1991 Option Plan.
</TABLE>

                                       79
<PAGE>
    ENTERRA.  The following table sets forth certain information with respect to
Enterra  Common  Stock  beneficially owned  as  of  the Record  Date  (except as
otherwise noted) by (i) persons  who are known to  Enterra to be the  beneficial
owners of 5% or more of Enterra Common Stock, (ii) each of the five highest paid
executive  officers of  Enterra, (iii)  each director  of Enterra,  and (iv) all
Enterra officers and directors as a  group, including pro forma information  for
such  persons assuming that  the Merger had  been consummated at  such date. The
persons listed have sole voting power and sole dispositive power with respect to
all shares set forth in the table unless otherwise specified in the footnotes to
the table.

<TABLE>
<CAPTION>
                                                     SHARES OWNED                    PERCENT OWNED
                                                     DIRECTLY OR     PERCENT OF      FOLLOWING THE
NAME AND ADDRESS                                    INDIRECTLY(1)(2)    CLASS          MERGER(3)
- --------------------------------------------------  --------------  ------------  -------------------
<S>                                                 <C>             <C>           <C>
First Reserve Corporation (4) ....................     11,212,349         40.3%            18.7%
 475 Steamboat Road
 Greenwich, CT 06830
FMR Corp. (5) ....................................      2,872,300         10.3%            9.95%(6)
 82 Devonshire Street
 Boston, MA 02109
James M. Ballengee (7) ...........................         43,332        *                 *
M. Timothy Carey (8) .............................         35,235        *                 *
Lee Daniel .......................................         37,950        *                 *
Thomas J. Edelman ................................         10,000        *                 *
C. Paul Evans ....................................         21,632        *                 *
Steven C. Grant ..................................         16,069        *                 *
John A. Hill (9) .................................     11,212,349         40.3%            18.7%
Steven W. Krablin ................................         19,657        *                 *
William E. Macaulay (9) ..........................     11,212,349         40.3%            18.7%
Robert L. Parker, Sr. ............................         65,934        *                 *
R. Rudolph Reinfrank .............................         15,000        *                 *
Roger M. Widmann .................................         10,000        *                 *
D. Dale Wood .....................................        179,866        *                 *
All directors and officers as a group (14 persons)
 (10) ............................................     11,673,936         41.5%            19.4%
<FN>
- ------------------------
 *   Denotes ownership of less than one percent.

(1)  On the Record  Date there were  27,822,950 shares of  Enterra Common  Stock
     outstanding.  Shares  not outstanding  but  beneficially owned  by  a given
     person are deemed outstanding for  purposes of computing the percentage  of
     Enterra  Common  Stock  owned  by  such person,  but  not  for  purposes of
     computing the percentage owned by any other person.

(2)  This column  includes shares  subject to  options granted  pursuant to  the
     Enterra  Corporation  Stock  Option Plan  for  Non-Employee  Directors (the
     "Non-Employee Directors  Plan") and  the Enterra  Corporation Stock  Option
     Plan  (the "Stock Option Plan") which are exercisable within 60 days of the
     Record Date. Under  the Non-Employee  Directors Plan,  Messrs. Edelman  and
     Widmann  each hold unexercised  options to purchase  10,000 of such shares,
     Messrs. Ballengee,  Daniel  and Parker  each  hold unexercised  options  to
     purchase 17,500 of such shares, and Mr. Reinfrank holds unexercised options
     to  purchase 15,000 of such shares. Under  the Stock Option Plan, Mr. Carey
     holds exercisable  options to  purchase 25,000  of such  shares, Mr.  Evans
</TABLE>

                                       80
<PAGE>
<TABLE>
<S>  <C>
     holds  exercisable options  to purchase  16,667 of  such shares,  Mr. Grant
     holds exercisable options to  purchase 13,532 of  such shares, Mr.  Krablin
     holds  exercisable options to  purchase 16,682 of such  shares and Mr. Wood
     holds exercisable options to purchase 178,533 of such shares.

(3)  Represents the  indicated  stockholder's percentage  ownership  Weatherford
     Common Stock to be outstanding following the Merger.

(4)  As  reflected in Amendment No. 1 to  Schedule 13D filed with the Commission
     on June 30, 1995.  Represents shares owned by  the following First  Reserve
     Funds: American Gas & Oil Investors, Limited Partnership -- 1,993,529; AmGO
     II,  Limited  Partnership --  1,233,907; AmGO  III, Limited  Partnership --
     597,408; First Reserve Secured Energy  Assets Fund, Limited Partnership  --
     2,323,562;  First Reserve Fund  V, Limited Partnership  -- 3,355,254; First
     Reserve Fund V-2, Limited  Partnership -- 838,427;  and First Reserve  Fund
     VI, Limited Partnership -- 870,262. First Reserve is the general partner of
     each  of such First Reserve  Funds. First Reserve, in  its role as managing
     general partner of  the First  Reserve Funds and  acting on  behalf of  the
     First  Reserve Funds,  has the  power to cause  each First  Reserve Fund to
     dispose of or vote shares of Enterra Common Stock held by it. The principal
     beneficial owners of the  common stock of First  Reserve are its  executive
     officers, including Messrs. Macaulay and Hill.

(5)  As  reflected in Amendment No. 4 to  Schedule 13G filed with the Commission
     on February 13, 1995.  These shares are beneficially  owned as of  December
     31,  1994  by FMR  Corp., a  parent holding  company of  various investment
     adviser companies. Of  these, Fidelity Management  and Research Company,  a
     wholly-owned  subsidiary of FMR Corp., is the beneficial owner of 2,572,900
     shares of  Enterra  Common Stock  outstanding  as  a result  of  acting  as
     investment adviser to several investment companies registered under Section
     8 of the Investment Company Act of 1940.

(6)  Also  includes shares  of Weatherford  Common Stock  held by  the indicated
     stockholder prior to the Merger.

(7)  This figure  also includes  242 shares  that  are owned  of record  by  Mr.
     Ballengee's wife, of which beneficial ownership is disclaimed.

(8)  Includes  five shares that are owned of record by Mr. Carey's son, of which
     beneficial ownership is disclaimed.

(9)  This figure equals all shares beneficially owned by First Reserve of  which
     Mr.  Hill is  Chairman and  Mr. Macaulay  is President  and Chief Executive
     Officer. Both Messrs. Hill and Macaulay disclaim beneficial ownership as to
     all such shares.

(10) Includes an aggregate of 337,914 shares subject to stock options under  the
     Stock  Option Plan and the Non-Employee  Directors Plan, 14,495 shares held
     by participants in the 401(k) Plan and 6,912 shares held by participants in
     the Enterra  Compression Company  and Affiliated  Companies Retirement  and
     Savings Plan.
</TABLE>

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<PAGE>
     PROPOSAL TO AMEND WEATHERFORD'S RESTATED CERTIFICATE OF INCORPORATION

    On  August 28, 1995, the Weatherford Board of Directors approved and adopted
the amendment of Weatherford's Restated  Certificate of Incorporation to  effect
the Reverse Stock Split and the Name Change. At the Weatherford Special Meeting,
Weatherford's stockholders are being asked to approve and adopt such amendment.

    REASONS  FOR  THE REVERSE  STOCK  SPLIT.   Upon  consummation of  the Merger
without giving effect to the Reverse  Stock Split, there would be 101.4  million
shares of Weatherford Common Stock outstanding. The Board of Directors believes,
based  on the advice of Merrill Lynch,  that the existing per share market price
of the Weatherford Common Stock may impair the acceptability of the  Weatherford
Common  Stock  to  certain  institutional investors  and  other  members  of the
investing public, and that the Weatherford Common Stock would be more attractive
to such investors if the per share market price were higher. Theoretically,  the
number  of shares outstanding should not, by itself, affect the marketability of
the  Weatherford  Common  Stock,  the  type  of  investor  who  acquires  it  or
Weatherford's  reputation in the  financial community. In  practice, this is not
necessarily the case.

    The Weatherford Board of Directors believes that the decrease in the  number
of  shares  of Weatherford  Common  Stock outstanding  as  a consequence  of the
Reverse Stock Split  and the  resulting anticipated increased  per share  market
price  should encourage greater interest in  the Weatherford Common Stock by the
financial community  and  the  investing public  and  possibly  promote  greater
liquidity  for Weatherford's stockholders. Weatherford's earnings per share will
increase proportionately as a result of the Reverse Stock Split.

    EFFECTS OF REVERSE STOCK SPLIT.  If  the Reverse Stock Split is approved  by
the  stockholders of Weatherford,  the result would  be that each  two shares of
Weatherford Common Stock held at the  Effective Time will be converted into  one
share of new Weatherford Common Stock.

    Weatherford  currently  has 80  million shares  of Weatherford  Common Stock
authorized. The Reverse Stock  Split will not affect  such number of  authorized
shares.

    Each  of  Weatherford's  employee  and  director  stock-based  benefit plans
provides that adjustments will be made in the number, class and per share  price
of shares of Weatherford Common Stock issuable under such plan in the event of a
capital  readjustment or other increase or reduction  in the number of shares of
Weatherford Common  Stock  outstanding  that  is  effected  without  receipt  of
compensation by Weatherford.

    TAX  EFFECT OF REVERSE STOCK SPLIT.  No gain or loss will be recognized by a
holder of Weatherford Common Stock who  receives only shares of new  Weatherford
Common  Stock as a result of the Reverse Stock Split. A cash payment received by
a holder of Weatherford  Common Stock in lieu  of a fraction of  a share of  new
Weatherford  Common Stock  will be treated  as if a  fraction of a  share of new
Weatherford Common Stock had  been received by  such holder as  a result of  the
Reverse  Stock Split and then redeemed  by Weatherford. Accordingly, such holder
may be  treated  for U.S.  Federal  income tax  purposes  as having  received  a
distribution  with  respect to  the  stock owned  by  such holder  taxable  as a
dividend under Section 301 of the Code to the extent of Weatherford's current or
accumulated earnings and profits.  The receipt of the  cash payment will not  be
treated  as a  sale or exchange  of the fraction  of a share  of new Weatherford
Common Stock  unless  the  holder's  interest in  Weatherford  Common  Stock  is
completely  terminated by such transaction or unless (i) the ratio of the voting
stock owned  by the  holder  (including stock  attributed  to the  holder  under
Section 302(c) of the Code) immediately after the Reverse Stock Split to all the
voting  stock of Weatherford is  less than 80% of the  same ratio for the voting
stock owned by the  holder immediately before the  Reverse Stock Split and  (ii)
the  holder  owns less  than  50% of  the voting  stock  of Weatherford.  If the
holder's interest  in Weatherford  is  not completely  terminated or  the  tests
described  in (i)  and (ii)  of the  preceding sentence  are not  satisfied, the
transaction will still be treated for U.S. Federal income tax purposes as a sale
or exchange rather than  a dividend if  it is "not  essentially equivalent to  a
dividend";  for example, where a holder's interest in Weatherford is minimal (an
interest of less than 1% should satisfy this requirement), the holder  exercises
no  control over  Weatherford and  the holder's  interest in  Weatherford Common
Stock is actually reduced as a result of the Reverse Stock Split. In determining
whether

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<PAGE>
a holder's interest in Weatherford Common  Stock has been reduced or  completely
terminated,  the holder  is deemed,  under the  constructive ownership  rules of
Section 302(c) of the Code, to own any shares in Weatherford Common Stock  owned
by  certain related persons and entities. If  the receipt of the cash payment is
treated as a distribution taxable as a dividend, then the holder's tax basis  in
the  redeemed  fraction of  a  share of  new  Weatherford Common  Stock  will be
transferred to any remaining  Weatherford Common Stock held  by such holder.  If
the holder does not retain any Weatherford Common Stock, then he or she may lose
such basis entirely.

    If  a receipt of  cash in lieu of  a fraction of a  share of new Weatherford
Common Stock  qualifies  as a  sale  or exchange  for  U.S. Federal  income  tax
purposes,  the redeemed holder will recognize taxable  gain or loss equal to the
difference between the amount of cash  received by such holder from  Weatherford
and  the holder's tax basis in such fraction  of a share. Such gain or loss will
be capital gain  or loss,  provided that  the holder has  held such  stock as  a
capital asset.

    THE  U.S. FEDERAL INCOME  TAX CONSEQUENCES SUMMARIZED  ABOVE ARE FOR GENERAL
INFORMATION ONLY. EACH WEATHERFORD STOCKHOLDER  SHOULD CONSULT A TAX ADVISOR  AS
TO THE PARTICULAR CONSEQUENCES OF THE REVERSE STOCK SPLIT THAT MAY APPLY TO SUCH
STOCKHOLDER,  INCLUDING THE  APPLICATION OF THE  STATE INHERITANCE  AND GIFT TAX
LAWS AND OF STATE, LOCAL AND FOREIGN TAX LAWS.

    EXCHANGE OF CERTIFICATES.   As soon as  practicable following the  Effective
Time, Weatherford will cause American Stock Transfer & Trust Company, which will
act as Exchange Agent, to mail to each record holder of Weatherford Common Stock
immediately  prior  to the  Effective Time,  a letter  of transmittal  and other
information advising such holder of the effectiveness of the Reverse Stock Split
and for  use  in  exchanging  old  Weatherford  Common  Stock  certificates  for
certificates  representing shares  of new Weatherford  Common Stock  and cash in
lieu of a fraction  of a share.  Letters of transmittal  also will be  available
following  the  Effective  Time at  the  offices  of the  Exchange  Agent. SHARE
CERTIFICATES  SHOULD  NOT  BE  SURRENDERED  FOR  EXCHANGE  BY  STOCKHOLDERS   OF
WEATHERFORD  PRIOR TO APPROVAL OF  THE REVERSE STOCK SPLIT  AND THE RECEIPT OF A
LETTER OF TRANSMITTAL.

    No certificate for a fraction of a share of Weatherford Common Stock will be
issued in the  Reverse Stock  Split. Each stockholder  of Weatherford  otherwise
entitled  to a fraction  of a share  will, upon surrender  of Weatherford Common
Stock certificates held by such holder, be  paid an amount in cash equal to  the
value  of such fraction of  a share based upon  the closing price of Weatherford
Common Stock on the NYSE on the last trading day prior to the Effective Time. No
interest will be paid on such amount and all shares of Weatherford Common  Stock
held  by a record holder will be aggregated for purposes of computing the number
of shares of new Weatherford Common Stock subject to the Reverse Stock Split.

    REASONS FOR  THE NAME  CHANGE.   Weatherford and  Enterra have  agreed  that
Weatherford's  name  would  be changed  to  "Weatherford Enterra,  Inc."  at the
Effective Time.  Managements  of  both  companies  believe  that  the  Surviving
Corporation  would benefit from the immediate name recognition of both companies
in the markets in which they do business.

    VOTE REQUIRED AND  RECOMMENDATION FOR  APPROVAL.  The  Weatherford Board  of
Directors  has  approved and  adopted the  proposed amendments  to Weatherford's
Restated Certificate of Incorporation. However, the proposed amendment will  not
be  implemented unless the  holders of a  majority of the  shares of Weatherford
Common Stock present in person or represented  by proxy and entitled to vote  at
the  Weatherford Special  Meeting vote  "for" the  approval and  adoption of the
amendments to Weatherford's Restated Certificate  of Incorporation. None of  the
Merger,  the Merger Agreement, the Reverse Stock  Split and the Name Change will
be effected unless all such matters are approved and adopted by the stockholders
of Weatherford and the Merger and the Merger Agreement are approved and  adopted
by  the stockholders of Enterra. The amendment  to the 1991 Option Plan will not
be effected unless the Merger, the Merger Agreement, the Reverse Stock Split and
the Name Change are approved and adopted by the stockholders of Weatherford  and
the Merger and the Merger Agreement are approved and adopted by the stockholders
of Enterra. The amendment to the Restricted Plan will

                                       83
<PAGE>
be  effected regardless of whether  any of the other  proposals are approved and
adopted by the stockholders  of Weatherford. The  Merger, the Merger  Agreement,
the  Reverse Stock  Split and  the Name  Change will  be effected  regardless of
whether either  or both  of  the amendments  to the  1991  Option Plan  and  the
Restricted Plan are approved and adopted by the stockholders of Weatherford.

    THE  BOARD  OF DIRECTORS  RECOMMENDS THAT  YOU VOTE  "FOR" THE  APPROVAL AND
ADOPTION OF THE  PROPOSED AMENDMENTS  TO WEATHERFORD'S  RESTATED CERTIFICATE  OF
INCORPORATION.

             PROPOSAL TO AMEND WEATHERFORD'S 1991 STOCK OPTION PLAN

    On  August 28, 1995, the Weatherford Board of Directors approved and adopted
the amendment of  the 1991 Option  Plan that will  make an additional  3,000,000
shares  of Weatherford Common  Stock (before giving effect  to the Reverse Stock
Split) available for  issuance upon the  exercise of options  granted under  the
1991  Option Plan.  Weatherford's stockholders  are being  asked to  approve and
adopt such amendment.

    As of the Record Date, approximately 2,575,000 shares of Weatherford  Common
Stock (before giving effect to the Reverse Stock Split) would have been required
to  satisfy unexercised  Enterra Options.  The purpose  of this  amendment is to
provide sufficient available shares to satisfy unexercised Enterra Options  that
are  replaced by substitute options, and to provide additional shares for future
option grants,  under the  1991 Option  Plan. The  shares underlying  each  such
substitute  option  will be  registered  under the  Securities  Act even  if the
proposed amendment to the 1991 Option  Plan is not approved by the  stockholders
of Weatherford. See "Terms of the Merger -- Enterra Options".

    The  1991 Option  Plan has been  approved previously by  the stockholders of
Weatherford. The following summary  of the major provisions  of the 1991  Option
Plan,  including  the amendment  thereto approved  by  the Weatherford  Board of
Directors and  proposed herein,  is necessarily  incomplete and  is,  therefore,
qualified  in its entirety by  reference to the detailed  provisions of the 1991
Option Plan.

    ADMINISTRATION.  The 1991  Option Plan is  administered by the  Compensation
and   Stock  Plans  Committee  of  the   Weatherford  Board  of  Directors  (the
"Committee"). The  Committee  has  the authority  to  determine  which  eligible
employees  of Weatherford shall receive options  under the 1991 Option Plan, the
times at  which  the options  are  to be  granted,  whether such  options  shall
constitute  incentive  stock  options  ("Incentive  Options"),  as  described in
Section 421A  of the  Code, or  options  not intended  to qualify  as  Incentive
Options  ("Nonqualified Options"), the number of shares covered by the option in
each case, the duration of  the options, when the  options may be exercised  and
other  terms and  conditions applicable  to each  option granted  under the 1991
Option Plan.

    SHARES SUBJECT TO OPTION.  As of the Record Date, a total of 970,128  shares
were  subject to options granted  under the 1991 Option  Plan and 627,789 shares
were available for future option grants under the 1991 Option Plan.  Weatherford
Common  Stock issued upon the exercise of  options granted under the 1991 Option
Plan may  consist of  authorized but  unissued shares  or shares  reacquired  by
Weatherford  and held as treasury stock. If an option under the 1991 Option Plan
expires or  terminates before  it has  been  exercised in  full, the  shares  of
Weatherford Common Stock allocable to the unexercised portion of such option may
again  be subject  to the granting  of options  under the 1991  Option Plan. The
number of shares available for the  granting of options and subject to  issuance
upon  the  exercise of  any outstanding  options, and  option prices,  as herein
described, are to be adjusted in  the event of any subdivision or  consolidation
of  shares or other  capital readjustment, payment of  a stock dividend, merger,
consolidation or similar transaction affecting the Weatherford Common Stock.

    ELIGIBILITY.  Subject to selection  by the Committee, any executive  officer
or  other  key  employee  (including an  officer  who  may be  a  member  of the
Weatherford  Board  of   Directors)  of  Weatherford,   or  of  any   subsidiary
corporation,  is eligible to be granted one  or more Incentive Options under the
1991 Option Plan. Subject to selection  by the Committee, any executive  officer
or  other  key  employee  (including an  officer  who  may be  a  member  of the
Weatherford Board  of Directors)  of  Weatherford or  any parent  or  subsidiary
corporation,  and  any other  person who  provides  services to  Weatherford and

                                       84
<PAGE>
such related corporations, is  eligible to be granted  one or more  Nonqualified
Options.  As of  the Record  Date, approximately  100 employees  and officers of
Weatherford and  its subsidiary  and affiliated  corporations were  eligible  to
participate in the 1991 Option Plan.

    OPTION PRICE.  The exercise price of each option must be equal to or greater
than  100% of the fair market value of  the Weatherford Common Stock on the date
such option is granted.  In the case  of an Incentive  Option granted under  the
1991  Option Plan to an employee who owns  stock possessing more than 10% of the
total combined voting power of all  classes of stock of Weatherford, the  option
price per share may not be less than 110% of the fair market value of a share of
Weatherford  Common Stock  on the  date the  option is  granted. A  holder of an
option granted under  the 1991 Option  Plan may  exercise his or  her option  by
paying  the  option  exercise  price  (i)  in  cash,  (ii)  subject  to  certain
conditions, in whole  or in  part by delivery  of shares  of Weatherford  Common
Stock  previously acquired by such holder or  (iii) subject to the provisions of
Rule 16b-3  promulgated  under the  Exchange  Act, by  delivery  of  irrevocable
instructions  to a broker to promptly deliver to Weatherford the option exercise
price, either from loan proceeds or sale of shares proceeds.

    DURATION OF OPTIONS.  Options may  be made exercisable during any  specified
period  of time from the date such option  is granted, but in no event shall the
exercise period of an option  exceed ten years. In the  case of any employee  of
Weatherford who owns stock possessing more than 10% of the total combined voting
power  of  all  classes of  stock  of  Weatherford, the  option  period  for any
Incentive Option may not exceed five years.

    MAXIMUM GRANT.   The maximum aggregate  number of shares  for which any  one
individual  may  be granted  an option  under  the 1991  Option Plan  during any
12-month period is 200,000 shares.

    MAXIMUM VALUE OF  STOCK SUBJECT  TO INCENTIVE OPTIONS.   To  the extent  the
aggregate  fair market  value of  Incentive Options measured  as of  the date of
grant exceeds $100,000 in the year  in which the options are first  exercisable,
the excess may not be considered Incentive Options.

    TRANSFERABILITY.    Options  granted  under the  1991  Option  Plan  will be
transferable only by will or under the laws of descent and distribution.

    EXERCISE OF OPTIONS.  Options shall become exercisable from time to time, in
whole or in part, beginning one year after the date of grant. Except as provided
otherwise herein,  an option  is  exercisable by  the  optionee only  while  the
individual  continues  the  employment relationship  or  other  affiliation with
Weatherford. If  an  optionee  retires  under  the  then  established  rules  of
Weatherford,  if he or she terminates employment  by reason of disability, or if
his or her employment terminates by reason of a change of control (as  described
below),  his or her then  outstanding vested options shall  be exercisable for a
period ending on the  earlier of the  expiration date of  the options and  three
months  following  his or  her  termination. In  the event  of  the death  of an
optionee before  the  date  of  expiration of  such  option,  such  option  will
terminate  on the earlier of such date  of expiration and one year following the
date of death. If an optionee's employment is terminated for reasons other  than
retirement,   disability,  change  of  control   or  death,  and  provided  such
termination did not occur because of  his or her dishonesty or competition,  his
or  her then outstanding vested options shall be exercisable for a period ending
on the earlier of the expiration date of such options and 30 days following  his
or her termination.

    CHANGE  OF  CONTROL.   The  1991 Option  Plan provides  that  if there  is a
fundamental corporate change,  an optionee has  the right to  (i) surrender  all
outstanding  options, whether or not then  exercisable, for a cash payment equal
to the amount  by which the  option price for  shares covered by  the option  is
exceeded  by the then fair  market value of such  shares, or, if applicable, the
price for such shares offered to stockholders of Weatherford in connection  with
any such fundamental corporate change, unless to do so would cause a transaction
otherwise  eligible  for  "pooling  of  interests"  accounting  treatment  under
Accounting Principles Board Opinion No. 16 to be ineligible for such  treatment,
in  which the case the optionee would receive shares of Weatherford Common Stock
equal in  value to  the cash  payment he  or she  would have  received, or  (ii)
exercise  all outstanding options, which would  automatically vest, for a period
ending  on   the  earlier   of  the   expiration  date   of  the   options   and

                                       85
<PAGE>
three  months after the date  of his or her  termination of employment. The 1991
Option Plan includes as a fundamental corporate change (i) a change of  control,
defined  as a third person  becoming the beneficial owner of  20% or more of the
voting securities of Weatherford, without  the consent of the Weatherford  Board
of  Directors, or  a situation where,  as a  result of a  contested election for
directors, the persons  who were  directors of Weatherford  before the  election
cease  to constitute a majority of the  Weatherford Board of Directors; (ii) any
merger or consolidation of Weatherford in which Weatherford is not the surviving
corporation; (iii) the dissolution  of Weatherford; or (iv)  the sale of all  or
substantially  all of  Weatherford's assets to  any other person  or entity. The
acceleration of vesting or the use of  Weatherford funds for payment of cash  to
option holders upon the occurrence of a fundamental corporate change may be seen
as  an  anti-takeover provision  and may  have the  effect of  discouraging such
fundamental corporate changes.

    AMENDMENTS.  The  Weatherford Board of  Directors has the  power to  modify,
revise or terminate the 1991 Option Plan. However, unless it shall have obtained
the  approval  of  the stockholders  of  Weatherford, the  Weatherford  Board of
Directors may  not (i)  materially  increase the  benefits accruing  to  persons
holding  options granted under  the 1991 Option Plan;  (ii) change the aggregate
number of  shares of  Weatherford Common  Stock issuable  upon the  exercise  of
options  granted under the 1991 Option Plan; (iii) reduce the per share exercise
price of any option to  an amount less than the  fair market value per share  at
the  time the option is granted; or  (iv) change the class of employees eligible
to receive options. The Weatherford Board of Directors also will have the  power
to  make such changes  in the 1991  Option Plan or  in any outstanding Incentive
Option granted  under the  1991 Option  Plan to  qualify as  an incentive  stock
option  or other stock option that  will receive preferential Federal income tax
treatment.

    NEW PLAN  BENEFITS.   The  benefits  received  by or  amounts  allocable  to
optionees  under the 1991 Option  Plan as a result  of the proposed amendment to
increase the  number of  shares available  under the  1991 Option  Plan are  not
determinable.

    VALUATION.  The fair market value of the Weatherford Common Stock was $12.75
per share on August 28, 1995.

    EFFECTIVE  DATE AND DURATION.   The 1991 Option Plan  became effective as of
March 19, 1991, and no  option will be granted under  this plan after March  18,
2001.

    TAX CONSEQUENCES.  The grant of Incentive Options under the 1991 Option Plan
will  not  result  in  income  tax consequences  to  either  Weatherford  or the
optionee. Persons exercising  Incentive Options  granted under  the 1991  Option
Plan  generally  will not  realize  ordinary income  in  the year  in  which the
Incentive  Option  is  exercised,  although  the  exercise  will  result  in  an
adjustment  for  calculating  the  alternative minimum  taxable  income  and may
require the payment of  an alternative minimum tax.  Such persons generally  are
expected to realize income in the year in which the shares purchased are sold or
disposed  of, in an amount  equal to the excess of  the amount received from the
sale of such shares over  the exercise price paid  for such shares. For  Federal
income  tax purposes, dispositions  are divided into  two categories: qualifying
and disqualifying.  A  qualifying  disposition  occurs  if  the  sale  or  other
disposition  is made after  the optionee has  held the shares  for more than two
years after the option grant date and  more than one year after transfer of  the
shares  to the optionee. If  a qualifying disposition is  made, the gain will be
taxed to the optionee as capital gain. If either of these holding periods is not
satisfied, then  a  qualifying  disposition  will  result.  If  a  disqualifying
disposition  occurs, the gain will be taxed  to the optionee as ordinary income.
If the optionee makes a disqualifying disposition of the purchased shares,  then
Weatherford  will be entitled  to a tax  deduction in the  taxable year in which
such disposition  occurs  in an  amount  equal to  the  income realized  by  the
optionee in the taxable year in which he or she realizes the income. In no other
instance  will Weatherford be allowed a deduction with respect to the optionee's
disposition of the purchased shares.

    The grant of Nonqualified Options under the 1991 Option Plan will not result
in income tax consequences  to either Weatherford or  the optionee. An  optionee
generally  will  realize ordinary  income in  the year  in which  a Nonqualified
Option  is   exercised   in   an   amount   equal   to   the   excess   of   the

                                       86
<PAGE>
fair market value of the purchased shares on the exercise date over the exercise
price.  Weatherford ordinarily will be entitled to  a tax deduction in an amount
equal to the  amount of  income realized  by the  optionee with  respect to  the
exercised option in the taxable year in which the optionee realizes the income.

    PARACHUTE  PAYMENTS.  In situations where  options are exercised following a
fundamental corporate change,  income recognized by  optionees upon exercise  of
options  may  constitute "parachute  payments" under  certain provisions  of the
Code. In general, a  "parachute payment" is  any payment made  in the nature  of
compensation  to a "disqualified  individual" that is contingent  on a change in
the ownership or effective control of  a corporation, but only if the  aggregate
present  value of all  such payments to the  "disqualified individual" equals or
exceeds three times  such person's  "base amount". In  general, a  "disqualified
individual" would include a participant in a Weatherford stock-based plan who is
a  substantial shareholder, a corporate officer or a highly compensated employee
of Weatherford. In general, an individual's "base amount" is his or her  average
annual  income in  the nature  of compensation in  the five  years preceding the
change of control. An "excess parachute  payment" is any "parachute payment"  in
excess  of the "base amount" that is not shown by the recipient to be reasonable
compensation for personal service  actually rendered or to  be rendered. To  the
extent  income recognized by a participant upon exercise of options, the vesting
of unrestricted  ownership  of  shares  of Weatherford  Common  Stock  or  other
issuances   under  such  stock-based  plans  constitutes  an  "excess  parachute
payment", no deduction would be allowed  to Weatherford and a nondeductible  20%
excise tax would be imposed on the recipient of such "excess parachute payment".
In   determining  the  amount  of  "parachute   payment"  with  respect  to  any
"disqualified individual", amounts (if any) payable to such individual under all
plans (other than plans qualified under Section 401(a), 403(a) or 408(k) of  the
Code)  maintained by  Weatherford, or pursuant  to any  applicable severance pay
agreements that are determined  to be contingent upon  a change of ownership  or
effective   control,  would   be  aggregated.  Regulations   indicate  that  the
determination  of   what  portions   of  such   payment  constitute   reasonable
compensation  and the  determination of which  payments to  such individual were
contingent upon the change of ownership or effective control of Weatherford must
be made  on the  basis of  all relevant  facts and  circumstances.  Accordingly,
Weatherford is unable to predict what payments made under a Weatherford plan, if
any,  would constitute  "excess parachute  payments" if  a fundamental corporate
change of Weatherford were to occur.

    VOTE REQUIRED AND  RECOMMENDATION FOR  APPROVAL.  The  Weatherford Board  of
Directors  has approved  and adopted the  proposed amendment to  the 1991 Option
Plan. However, the proposed amendment will not be implemented unless the holders
of a majority of  the shares of  Weatherford Common Stock  present in person  or
represented  by proxy  and entitled to  vote at the  Weatherford Special Meeting
vote "for" the approval and adoption of  the amendment to the 1991 Option  Plan.
The  amendment to the 1991  Option Plan will not  be effected unless the Merger,
the Merger Agreement, the Reverse Stock  Split and the Name Change are  approved
and  adopted by the  stockholders of Weatherford  and the Merger  and the Merger
Agreement are approved and adopted by the stockholders of Enterra. The amendment
to the Restricted Plan will be effected  regardless of whether any of the  other
proposals  are  approved and  adopted by  the  stockholders of  Weatherford. The
Merger, the Merger Agreement, the Reverse  Stock Split and the Name Change  will
be  effected regardless of whether either or  both of the amendments to the 1991
Option Plan and the Restricted Plan are approved and adopted by the stockholders
of Weatherford.

    THE BOARD  OF DIRECTORS  RECOMMENDS THAT  YOU VOTE  "FOR" THE  APPROVAL  AND
ADOPTION OF THE PROPOSED AMENDMENT TO THE 1991 STOCK OPTION PLAN.

        PROPOSAL TO AMEND WEATHERFORD'S RESTRICTED STOCK INCENTIVE PLAN

    On  August 28, 1995, the Weatherford Board of Directors approved and adopted
the amendment of the Restricted Plan that will make an additional 250,000 shares
of Weatherford Common Stock

                                       87
<PAGE>
(before giving effect to the Reverse  Stock Split) available for issuance  under
the   Restricted  Plan.  At  the   Weatherford  Special  Meeting,  Weatherford's
stockholders are being asked to approve and adopt such amendment.

    The purpose of this amendment is to provide sufficient available shares  for
future grants under the Restricted Plan.

    The  Restricted Plan  has been  approved previously  by the  stockholders of
Weatherford. The following  summary of  the major provisions  of the  Restricted
Plan,  including  the amendment  thereto approved  by  the Weatherford  Board of
Directors and  proposed herein,  is necessarily  incomplete and  is,  therefore,
qualified  in  its  entirety by  reference  to  the detailed  provisions  of the
Restricted Plan.

    ADMINISTRATION.  The Restricted Plan  is administered by the Committee.  The
Committee  has the authority to determine which key employees of Weatherford are
eligible  to  receive  shares  of  Weatherford  Common  Stock  pursuant  to  the
Restricted Plan and the terms and conditions of any share grants.

    SHARES  SUBJECT TO GRANT.   As of the Record Date,  a total of 70,875 shares
were available for future grants  under the Restricted Plan. Weatherford  Common
Stock  issued under the  Restricted Plan may consist  of authorized but unissued
shares or shares reacquired by Weatherford and held as treasury stock. If shares
granted under  the Restricted  Plan  are forfeited,  such  shares may  again  be
subject  to grant under the Restricted Plan.  The number of shares available for
grant under  the  Restricted  Plan  is  to be  adjusted  in  the  event  of  any
subdivision  or consolidation of  shares or other  capital readjustment, merger,
consolidation or similar transaction affecting the Weatherford Common Stock.

    ELIGIBILITY.  Subject to selection  by the Committee, any executive  officer
or  other  key  employee  (including an  officer  who  may be  a  member  of the
Weatherford Board of Directors) of Weatherford,  or of any parent or  subsidiary
corporation,  is eligible to be granted shares of Weatherford Common Stock under
the Restricted Plan.  Eligibility for  participation in the  Restricted Plan  is
currently  limited to executive officers of  Weatherford (as of the Record Date,
five persons).

    OPERATION OF THE  RESTRICTED PLAN.   The Committee  will from  time to  time
select  eligible employees to participate in  the Restricted Plan. The Committee
will determine  the number  of shares  that will  be contingently  granted to  a
participant  at the beginning  of a performance period,  the restrictions on the
participant's ownership  of  those shares  and  the conditions  upon  which  the
ownership  restrictions or conditions will  terminate (such as the participant's
continued employment or meeting long-term or short-term performance goals).  The
participant  will be awarded at the beginning of a performance period the number
and types  of shares  designated  by the  Committee,  subject to  the  ownership
restrictions  and conditions imposed by the  Committee. The terms and provisions
of each  share grant  will  be set  forth in  a  share grant  agreement  between
Weatherford and the participant.

    A  participant will own the shares of Weatherford Common Stock from the date
of the share grant, subject to restrictions on ownership and conditions  imposed
by  the Committee.  The Committee will  determine (1) the  conditions upon which
unrestricted ownership  of the  shares will  vest in  the participant;  (2)  any
long-term or short-term performance goals applicable to such shares; (3) whether
a stock certificate representing part or all of the shares will be issued to the
participant  at the commencement of the performance  period or at any time prior
to the end of such  period (in which case the  stock certificate will contain  a
legend  restricting the  sale, exchange,  transfer, assignment,  pledge or other
disposition of the shares); (4) whether  the participant will have the right  to
vote  the shares during the performance period; (5) whether the participant will
have the  right  to  receive  any  dividends paid  on  such  shares  during  the
performance  period or whether  such dividends will  be accrued and  paid to the
participant only when the restrictions on his or her ownership of the shares are
removed, either at  the end  of the  performance period  or at  some other  time
designated  by the Committee;  and (6) any  other matters relevant  to the share
grant. All shares  granted pursuant to  the Restricted Plan  will be subject  to
restrictions  on ownership when granted,  and a participant will  not be able to
sell, exchange, transfer,  assign, pledge  or otherwise dispose  of such  shares
until  the restrictions on ownership are  removed by the Committee in accordance
with the terms of the share grant.

                                       88
<PAGE>
    The restrictions on  the participant's  ownership of  any Restricted  Shares
will  be removed at times specified  by the Committee. The participant generally
must be employed by Weatherford at  the specified times for the restrictions  to
be  removed, although  the Committee  can provide  otherwise. The  Committee can
provide that the restrictions will be removed with respect to a certain  portion
of  the shares  at designated  times (such  as annually)  during the performance
period or on all such shares at the end of the performance period. In the  event
the   participant's  employment   relationship  ends  prior   to  the  ownership
restrictions on the Restricted Shares being removed, the participant will,  upon
the  request  of the  Committee, for  no  consideration, forfeit  all Restricted
Shares that remain subject to such restrictions and surrender to Weatherford all
stock certificates representing such shares, if any have been issued.

    The Committee has the ability to remove  the restrictions on part or all  of
the  shares granted to a participant  in the event of his  or her death or total
and permanent disability  prior to  the removal of  ownership restrictions.  The
removal  of such restrictions normally  would be based on  the length of service
the participant has in a  performance period, the participant's performance  and
such  other matters  as the Committee  deems appropriate. The  Committee has the
ability to remove the  restrictions on part  or all of the  shares granted to  a
participant  who takes early retirement at the convenience of Weatherford during
a performance period  prior to the  removal of the  ownership restrictions.  The
removal  of such restrictions normally  would be based on  the length of service
the participant has in a  performance period, the participant's performance  and
such other matters as the Committee deems appropriate.

    CHANGE  OF CONTROL.   If a  change of  control should occur  with respect to
Weatherford, all restrictions remaining on  any shares granted to a  participant
will automatically terminate and unrestricted ownership of such shares will then
vest  in the participant. The  Restricted Plan defines a  change of control as a
third person  becoming  the  beneficial owner  of  20%  or more  of  the  voting
securities  of  Weatherford, without  the consent  of  the Weatherford  Board of
Directors, or  a  situation where,  as  a result  of  a contested  election  for
directors,  the persons  who were directors  of Weatherford  before the election
cease to  constitute a  majority  of the  Weatherford  Board of  Directors.  The
acceleration  of termination  of ownership restrictions  on the  shares upon the
occurrence of a change of control may be seen as an anti-takeover provision  and
may have the effect of discouraging such change of control.

    AMENDMENTS.   The  Weatherford Board of  Directors has the  power to modify,
revise or terminate the Restricted Plan. However, unless it shall have  obtained
the  approval  of  the stockholders  of  Weatherford, the  Weatherford  Board of
Directors may  not  materially  increase  the  aggregate  number  of  shares  of
Weatherford  Common  Stock  that  can  be  granted  under  the  Restricted Plan,
materially increase  the benefits  accruing to  the participants  or  materially
modify the eligibility requirements.

    NEW  PLAN  BENEFITS.   The  benefits  received  by or  amounts  allocable to
participants under the Restricted Plan as a result of the proposed amendment  to
increase  the  number of  shares  available under  the  Restricted Plan  are not
determinable.

    VALUATION.  The fair market value of the Weatherford Common Stock was $12.75
per share on August 28, 1995.

    EFFECTIVE DATE AND  DURATION.  The  Restricted Plan became  effective as  of
March 18, 1987. The duration of the Restricted Plan is perpetual.

    TAX CONSEQUENCES.  The Restricted Plan is not qualified under Section 401(a)
of  the Code. An eligible employee probably will realize compensation income for
Federal tax purposes on the shares of Weatherford Common Stock granted to him or
her when the restrictions on ownership of  the shares lapse or are removed.  The
amount of the income will be the fair market value of such shares on the day the
restrictions  lapse or are removed. Weatherford ordinarily will be entitled to a
deduction equivalent to the amount of income realized by the eligible employee.

    PARACHUTE PAYMENTS.   In  situations where  the ownership  restrictions  are
terminated  following a change of control, income recognized by participants may
constitute "parachute  payments"  under  certain provisions  of  the  Code.  See
"Proposal to Amend Weatherford's 1991 Stock Option Plan -- Parachute Payments".

                                       89
<PAGE>
    VOTE  REQUIRED AND  RECOMMENDATION FOR APPROVAL.   The  Weatherford Board of
Directors has  approved and  adopted the  proposed amendment  to the  Restricted
Plan. However, the proposed amendment will not be implemented unless the holders
of  a majority of  the shares of  Weatherford Common Stock  present in person or
represented by proxy  and entitled to  vote at the  Weatherford Special  Meeting
vote  "for" the approval and  adoption of the amendment  to the Restricted Plan.
The amendment to the Restricted Plan will be effected regardless of whether  any
of  the other proposals  described in this  Joint Proxy Statement/Prospectus are
approved and adopted by the stockholders of Weatherford. The Merger, the  Merger
Agreement,  the  Reverse  Stock  Split  and the  Name  Change  will  be effected
regardless of whether either or both of  the amendments to the 1991 Option  Plan
and  the  Restricted  Plan  are  approved and  adopted  by  the  stockholders of
Weatherford.

    THE WEATHERFORD  BOARD  OF DIRECTORS  RECOMMENDS  THAT YOU  VOTE  "FOR"  THE
APPROVAL OF THE PROPOSED AMENDMENT TO THE RESTRICTED PLAN.

               RELATIONSHIPS WITH INDEPENDENT PUBLIC ACCOUNTANTS

    It  is expected that representatives of  Arthur Andersen LLP will be present
at the  Weatherford  Special Meeting,  and  that representatives  of  KPMG  Peat
Marwick  LLP  will be  present at  the  Enterra Special  Meeting, to  respond to
appropriate questions of stockholders and to make a statement if they so desire.

                                 LEGAL MATTERS

    The validity  of the  shares of  Weatherford Common  Stock to  be issued  in
connection  with the Merger will be passed  upon by Fulbright & Jaworski L.L.P.,
1301 McKinney, Suite 5100, Houston, Texas 77010. Certain tax consequences of the
Merger will be passed  upon for Weatherford by  Fulbright & Jaworski L.L.P.  and
for  Enterra by  Morgan, Lewis &  Bockius, 2000 One  Logan Square, Philadelphia,
Pennsylvania 19103.

                                    EXPERTS

    The consolidated  financial  statements  and  schedules  of  Weatherford  at
December  31, 1994 and 1993, and for each of the three years in the period ended
December  31,   1994,   incorporated   by  reference   in   this   Joint   Proxy
Statement/Prospectus  have  been  audited by  Arthur  Andersen  LLP, independent
public accountants, as indicated in their reports with respect thereto, and  are
incorporated  by reference in this  Joint Proxy Statement/Prospectus in reliance
upon the authority of said firm as experts in accounting and auditing in  giving
said reports.

    The  consolidated financial statements and  schedules of Enterra at December
31, 1994 and 1993, and for each of the three years in the period ended  December
31,  1994, incorporated  by reference  in this  Joint Proxy Statement/Prospectus
have been  audited  by  KPMG  Peat Marwick  LLP,  independent  certified  public
accountants,  as  indicated  in  their  report  with  respect  thereto,  and are
incorporated by reference in this  Joint Proxy Statement/Prospectus in  reliance
upon the authority of said firm as experts in accounting and auditing.

    The  consolidated financial  statements of  TOTAL at  December 31,  1993 and
1992, and for each  of the three  years in the period  ended December 31,  1993,
incorporated  by reference in  this Joint Proxy  Statement/Prospectus, have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
with respect thereto,  and are  incorporated by  reference in  this Joint  Proxy
Statement/  Prospectus in reliance upon such  report given upon the authority of
such firm as experts in accounting and auditing.

    The combined financial statements of  Zapata Energy Industries at  September
30,  1994, and for  the eleven months  then ended, incorporated  by reference in
this Joint Proxy  Statement/Prospectus have  been audited by  Coopers &  Lybrand
L.L.P.,  independent  accountants, as  indicated  in their  report  with respect
thereto,   and   are   incorporated   by   reference   in   this   Joint   Proxy
Statement/Prospectus  in reliance upon the authority  of said firm as experts in
accounting and auditing.

                                       90
<PAGE>
                            STOCKHOLDERS' PROPOSALS

    Any proposals  of  holders  of  Weatherford  Common  Stock  intended  to  be
presented  at the Annual  Meeting of Stockholders  of Weatherford to  be held in
1996 must be  received by Weatherford,  addressed to the  Secretary at P.O.  Box
27608,  Houston, Texas 77227, no  later than December 8,  1995, to be considered
for inclusion in the proxy statement and form of proxy relating to that meeting.

    If the Merger is not consummated,  any proposals of stockholders of  Enterra
intended  to be presented at the Annual Meeting of Stockholders of Enterra to be
held in 1996 must be  received by Enterra, addressed  to the Secretary at  13100
Northwest Freeway, Sixth Floor, Houston, Texas 77040, no later than December 31,
1995,  to be considered for  inclusion in the proxy  statement and form of proxy
relating to that meeting.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The  following   documents  heretofore   filed  with   the  Commission   are
incorporated by reference herein:

    (a) Weatherford's (i) Annual Report on Form 10-K for the year ended December
       31,  1994, (ii) Quarterly Report on Form 10-Q for the quarter ended March
       31, 1995, (iii) Current Report  on Form 8-K dated  July 6, 1995 and  (iv)
       Quarterly Report on Form 10-Q for the quarter ended June 30, 1995;

    (b)  Enterra's  (i) Registration  Statement  on Form  S-4  (Registration No.
       33-80174),  with  respect  to   the  consolidated  historical   financial
       statements  of  Total  Energy Services  Company  contained  therein, (ii)
       Annual Report on Form  10-K for the year  ended December 31, 1994,  (iii)
       Quarterly  Report on Form 10-Q for the quarter ended March 31, 1995, (iv)
       Current Report on Form  8-K dated July 6,  1995, (v) Quarterly Report  on
       Form  10-Q for the quarter ended June 30, 1995 and (vi) Current Report on
       Form 8-K dated August 28, 1995,  with respect to the combined  historical
       financial statements of Zapata Energy Industries; and

    (c)  Weatherford's Registration Statement on  Form 8-A registering under the
       Exchange Act the Weatherford Common Stock.

    All documents filed by Weatherford  or Enterra with the Commission  pursuant
to  Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Joint Proxy Statement/Prospectus and before the date of the Weatherford  Special
Meeting  or the  Enterra Special  Meeting, respectively,  shall be  deemed to be
incorporated by reference in this Joint  Proxy Statement/Prospectus and to be  a
part  hereof from the date of filing  of such documents. Any statement contained
in this Joint Proxy Statement/Prospectus or in a document incorporated or deemed
to be incorporated by reference  in this Joint Proxy Statement/Prospectus  shall
be  deemed  to  be modified  or  superseded  for purposes  of  this  Joint Proxy
Statement/Prospectus to  the extent  that a  statement contained  in this  Joint
Proxy Statement/Prospectus or in any other subsequently filed document that also
is  or is deemed to  be incorporated by reference  herein modifies or supersedes
such statement.  Any such  statement  so modified  or  superseded shall  not  be
deemed,  except as so modified or superseded, to constitute a part of this Joint
Proxy Statement/Prospectus.

    Weatherford and Enterra undertake to  provide without charge to each  person
to whom a copy of this Joint Proxy Statement/Prospectus has been delivered, upon
the  written or oral  request of any  such person, a  copy of any  or all of the
documents incorporated  by reference  herein, other  than the  exhibits to  such
documents,  unless such exhibits are specifically incorporated by reference into
the information that this Joint Proxy Statement/Prospectus incorporates. Written
or oral requests  for such  copies should be  directed (i)  for Weatherford,  to
Weatherford  International Incorporated,  1360 Post  Oak Boulevard,  Suite 1000,
Houston, Texas  77056, Attention:  Investor  Relations, telephone  number  (713)
439-9400, and (ii) for Enterra, to Enterra Corporation, 13100 Northwest Freeway,
Sixth  Floor,  Houston, Texas  77040,  Attention: E.  Joanne  January, telephone
number (713) 462-7300.

                                       91
<PAGE>
                    APPENDIX A: AGREEMENT AND PLAN OF MERGER

                                      A-1
<PAGE>

                                                            APPENDIX A

                          AGREEMENT AND PLAN OF MERGER



                                     Between


                     Weatherford International Incorporated

                                       and

                               Enterra Corporation


                                  June 23, 1995

                          (As amended August 28, 1995)

<PAGE>

                                TABLE OF CONTENTS

ARTICLE I
THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.1  THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.2  CLOSING DATE . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.3  CONSUMMATION OF THE MERGER . . . . . . . . . . . . . . . . . . . .   2
     1.4  EFFECTS OF THE MERGER. . . . . . . . . . . . . . . . . . . . . . .   2
     1.5  CERTIFICATE OF INCORPORATION; BYLAWS . . . . . . . . . . . . . . .   2
     1.6  DIRECTORS AND OFFICERS . . . . . . . . . . . . . . . . . . . . . .   2
     1.7  CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES. . . . . . .   2
     1.8  TAKING OF NECESSARY ACTION; FURTHER ACTION . . . . . . . . . . . .   4

ARTICLE II
REPRESENTATIONS AND WARRANTIES . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1  CERTAIN DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD. . . . . . . . . . .   5
          (a)  ORGANIZATION AND COMPLIANCE WITH LAW. . . . . . . . . . . . .   5
          (b)  CAPITALIZATION. . . . . . . . . . . . . . . . . . . . . . . .   6
          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT . . . . . . . . . . .   7
          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
               INSTRUMENTS TO WHICH WEATHERFORD IS A PARTY . . . . . . . . .   7
          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS. . . . . . . . . . .   8
          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
               CERTAIN CHANGES AND EVENTS. . . . . . . . . . . . . . . . . .   9
          (g)  CERTAIN FEES. . . . . . . . . . . . . . . . . . . . . . . . .  10
          (h)  LITIGATION. . . . . . . . . . . . . . . . . . . . . . . . . .  10
          (i)  EMPLOYEE BENEFIT PLANS. . . . . . . . . . . . . . . . . . . .  10
          (j)  TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
          (k)  ENVIRONMENTAL . . . . . . . . . . . . . . . . . . . . . . . .  13
          (l)  NO SEVERANCE PAYMENTS . . . . . . . . . . . . . . . . . . . .  14
          (m)  VOTING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . .  14
          (n)  INSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . .  14
          (o)  TITLE TO PROPERTY . . . . . . . . . . . . . . . . . . . . . .  14
          (p)  WEATHERFORD ACTIONS . . . . . . . . . . . . . . . . . . . . .  14
     2.3  REPRESENTATIONS AND WARRANTIES OF ENTERRA. . . . . . . . . . . . .  14
          (a)  ORGANIZATION AND COMPLIANCE WITH LAW. . . . . . . . . . . . .  14
          (b)  CAPITALIZATION. . . . . . . . . . . . . . . . . . . . . . . .  15
          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT . . . . . . . . . . .  15
          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
               INSTRUMENTS TO WHICH ENTERRA IS A PARTY . . . . . . . . . . .  16
          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS. . . . . . . . . . .  16
          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
               CERTAIN CHANGES AND EVENTS. . . . . . . . . . . . . . . . . .  18
          (g)  CERTAIN FEES. . . . . . . . . . . . . . . . . . . . . . . . .  18
          (h)  LITIGATION. . . . . . . . . . . . . . . . . . . . . . . . . .  18
          (i)  EMPLOYEE BENEFIT PLANS. . . . . . . . . . . . . . . . . . . .  19
          (j)  TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21


                                       -i-

<PAGE>

          (k)  ENVIRONMENTAL . . . . . . . . . . . . . . . . . . . . . . . .  21
          (l)  NO SEVERANCE PAYMENTS . . . . . . . . . . . . . . . . . . . .  22
          (m)  VOTING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . .  22
          (n)  INSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . .  22
          (o)  TITLE TO PROPERTY . . . . . . . . . . . . . . . . . . . . . .  22
          (p)  ENTERRA ACTIONS . . . . . . . . . . . . . . . . . . . . . . .  22

ARTICLE III
COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME . . . . . . . . . . . .  23
     3.1  CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER. . . . . . .  23
     3.2  ACCESS TO INFORMATION. . . . . . . . . . . . . . . . . . . . . . .  25
     3.3  AFFILIATES' AGREEMENTS . . . . . . . . . . . . . . . . . . . . . .  25
     3.4  RESERVATION OF WEATHERFORD COMMON STOCK. . . . . . . . . . . . . .  25
     3.5  STOCK EXCHANGE LISTING . . . . . . . . . . . . . . . . . . . . . .  25

ARTICLE IV
COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME . . . . . . . . . . . . . .  25
     4.1  CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER. . . . . . . . .  25
     4.2  ACCESS TO INFORMATION. . . . . . . . . . . . . . . . . . . . . . .  27
     4.3  AFFILIATES' AGREEMENTS . . . . . . . . . . . . . . . . . . . . . .  27

ARTICLE V
ADDITIONAL AGREEMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
     5.1  JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT . . . . .  28
     5.2  COMFORT LETTERS. . . . . . . . . . . . . . . . . . . . . . . . . .  28
     5.3  MEETINGS OF STOCKHOLDERS . . . . . . . . . . . . . . . . . . . . .  28
     5.4  REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS. . . . . . . .  29
     5.5  ANTITRUST MATTERS. . . . . . . . . . . . . . . . . . . . . . . . .  30
     5.6  NOTIFICATION OF CERTAIN MATTERS. . . . . . . . . . . . . . . . . .  30
     5.7  AGREEMENT TO DEFEND. . . . . . . . . . . . . . . . . . . . . . . .  30
     5.8  EXPENSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
     5.9  INDEMNIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . .  31
     5.10 POST-EFFECTIVE TIME MAILING. . . . . . . . . . . . . . . . . . . .  32
     5.11 STOCKHOLDERS' AGREEMENT. . . . . . . . . . . . . . . . . . . . . .  32
     5.12 ENTERRA STOCK OPTIONS. . . . . . . . . . . . . . . . . . . . . . .  32
     5.13 ENTERRA EMPLOYEE BENEFITS. . . . . . . . . . . . . . . . . . . . .  33
     5.14 UPDATE OF DISCLOSURE LETTERS . . . . . . . . . . . . . . . . . . .  34
     5.15 WEATHERFORD SPECIAL SEVERANCE PAY PLAN . . . . . . . . . . . . . .  34
     5.16 CHANGE OF CONTROL AGREEMENTS . . . . . . . . . . . . . . . . . . .  34
     5.17 INDEMNIFICATION AGREEMENTS . . . . . . . . . . . . . . . . . . . .  34
     5.18 ENTERRA EMPLOYEE BONUSES.. . . . . . . . . . . . . . . . . . . . .  35
     5.19 ENTERRA SEVERANCE AGREEMENTS.. . . . . . . . . . . . . . . . . . .  35
     5.20 ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER. . . . . .  36
     5.21 WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER. . . .  36
     5.22 BOARD OF DIRECTORS . . . . . . . . . . . . . . . . . . . . . . . .  36


                                      -ii-

<PAGE>

ARTICLE VI
CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
     6.1  CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER . . .  37
     6.2  ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD. . . . . . . .  38
     6.3  ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA. . . . . . . . . .  40

ARTICLE VII
SPECIAL PROVISIONS AS TO CERTAIN MATTERS . . . . . . . . . . . . . . . . . .  42
     7.1  NO SOLICITATION BY WEATHERFORD . . . . . . . . . . . . . . . . . .  42
     7.2  NO SOLICITATION BY ENTERRA . . . . . . . . . . . . . . . . . . . .  43
     7.3  FEE AND EXPENSE REIMBURSEMENTS . . . . . . . . . . . . . . . . . .  45

ARTICLE VIII
MISCELLANEOUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
     8.1  TERMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
     8.2  EFFECT OF TERMINATION. . . . . . . . . . . . . . . . . . . . . . .  47
     8.3  WAIVER AND AMENDMENT . . . . . . . . . . . . . . . . . . . . . . .  48
     8.4  NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
          AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.5  PUBLIC STATEMENTS. . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.6  BINDING EFFECT; ASSIGNMENT . . . . . . . . . . . . . . . . . . . .  48
     8.7  NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.8  GOVERNING LAW; JURISDICTION. . . . . . . . . . . . . . . . . . . .  49
     8.9  SEVERABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.10 COUNTERPARTS . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.11 HEADINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.12 ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES. . . . . . . . . . . .  50


                                      -iii-

<PAGE>

                          AGREEMENT AND PLAN OF MERGER

     This Agreement and Plan of Merger, dated as of the 23rd day of June, 1995
(the "Agreement"), is between Weatherford International Incorporated, a Delaware
corporation ("Weatherford"), and Enterra Corporation, a Delaware corporation
("Enterra").

     WHEREAS, subject to and in accordance with the terms and conditions of this
Agreement, the respective Boards of Directors of Weatherford and Enterra have
approved the merger of Enterra with and into Weatherford (the "Merger"), whereby
each issued and outstanding share of common stock, par value $1.00 per share, of
Enterra ("Enterra Common Stock") not owned directly or indirectly by Enterra or
Weatherford will be converted into the right to receive common stock, par value
$.10 per share, of Weatherford ("Weatherford Common Stock"), as provided herein;

     WHEREAS, for federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization within the meaning of Section 368(a) of the
Internal Revenue Code of 1986, as amended (the "Code");

     WHEREAS, the Merger is intended to be treated as a "pooling of interests"
for accounting purposes; and

     WHEREAS, the parties hereto desire to set forth certain representations,
warranties and covenants made by each to the other as an inducement to the
consummation of the Merger;

     NOW, THEREFORE, in consideration of the premises and of the mutual
representations, warranties and covenants herein contained, the parties hereto
hereby agree as follows:

                                    ARTICLE I
                                   THE MERGER

     1.1  THE MERGER.  Subject to and in accordance with the terms and
conditions of this Agreement and in accordance with the Delaware General
Corporation Law (the "DGCL"), at the Effective Time (as defined in Section 1.3)
Enterra will be merged with and into Weatherford.  As a result of the Merger,
the separate corporate existence of Enterra shall cease and Weatherford shall
continue as the surviving corporation (sometimes referred to herein as the
"Surviving Corporation") and shall succeed to and assume all of the rights and
obligations of Enterra in accordance with the DGCL.  The corporate name of the
Surviving Corporation shall be "Weatherford Enterra, Inc.".

     1.2  CLOSING DATE.  The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Fulbright &
Jaworski L.L.P., 1301 McKinney, Suite 5100, Houston, Texas as soon as
practicable after the satisfaction or waiver of the conditions set forth in
Article VI or at such other time and place and on such other date as Weatherford
and Enterra shall agree; PROVIDED, that the closing


                                       -1-

<PAGE>

conditions set forth in Article VI shall have been satisfied or waived at or
prior to such time.  The date on which the Closing occurs is herein referred to
as the "Closing Date".

     1.3  CONSUMMATION OF THE MERGER.  As soon as practicable on the Closing
Date, the parties hereto will cause the Merger to be consummated by filing with
the Secretary of State of the State of Delaware a certificate of merger in such
form as required by, and executed in accordance with, the relevant provisions of
the DGCL.  The "Effective Time" of the Merger as that term is used in this
Agreement shall mean the effective time set forth in the certified copy of the
certificate of merger issued by the Secretary of State of the State of Delaware
with respect to the Merger.

     1.4  EFFECTS OF THE MERGER.  The Merger shall have the effects set forth in
the applicable provisions of the DGCL.

     1.5  CERTIFICATE OF INCORPORATION; BYLAWS.  The Restated Certificate of
Incorporation and bylaws of Weatherford, as in effect immediately prior to the
Effective Time, shall be the Certificate of Incorporation and bylaws of the
Surviving Corporation and thereafter shall continue to be its Certificate of
Incorporation and bylaws until amended as provided therein and under the DGCL.

     1.6  DIRECTORS AND OFFICERS.

          (a)  The Board of Directors of the Surviving Corporation shall consist
     of ten persons.  Exhibit 1.6(a) sets forth the initial directors of the
     Surviving Corporation, along with the term of office for, and the committee
     or committees of the Board of Directors, if any, on, which each such
     director shall serve.

          (b)  Exhibit 1.6(b) sets forth the initial officers of the Surviving
     Corporation, each of whom shall hold office until his or her successor is
     duly elected or appointed and qualified.

     1.7  CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES.  Subject to the
terms and conditions of this Agreement, at the Effective Time, by virtue of the
Merger and without any action on the part of Weatherford, Enterra or their
stockholders:

          (a)  Each share of Enterra Common Stock issued and outstanding
     immediately prior to the Effective Time (the "Shares"), other than any
     Shares to be canceled pursuant to Section 1.7(b), shall be converted,
     subject to the provisions of this Section 1.7, into the right to receive
     0.845 of a share (which number reflects a 1 for 2 reverse stock split to be
     effected at the Closing) of Weatherford Common Stock (the "Conversion
     Rate"); PROVIDED, HOWEVER, that no fractional shares of Weatherford Common
     Stock shall be issued, and, in lieu thereof, a cash payment shall be made
     pursuant to Section 1.7(f) hereof.

          (b)  Each share of Enterra Common Stock held in the treasury of
     Enterra and each Share owned by Weatherford or any direct or indirect
     wholly-owned subsidiary of Enterra or of Weatherford immediately prior to
     the


                                       -2-

<PAGE>

     Effective Time shall be canceled and extinguished at the Effective Time
     without any conversion thereof and no payment shall be made with respect
     thereto.

          (c)  As soon as practicable after the Effective Time, each holder of
     an outstanding certificate that prior thereto represented Shares shall be
     entitled, upon surrender thereof to the transfer agent for the Weatherford
     Common Stock, to receive in exchange therefor a certificate or certificates
     representing the number of whole shares of Weatherford Common Stock into
     which the Shares so surrendered shall have been converted as aforesaid, of
     such denominations and registered in such names as such holder may request.
     Each holder of Shares who would otherwise be entitled to a fraction of a
     share of Weatherford Common Stock shall, upon surrender of the certificates
     representing Shares held by such holder to Weatherford's transfer agent, be
     paid an amount in cash in accordance with the provisions of Section 1.7(f).
     Until so surrendered, each outstanding certificate that, prior to the
     Effective Time, represented Shares shall be deemed from and after the
     Effective Time, for all corporate purposes, other than the payment of
     earlier dividends and distributions, to evidence the ownership of the
     number of full shares of Weatherford Common Stock into which such Shares
     shall have been converted pursuant to this Section 1.7.  Unless and until
     any such outstanding certificates shall be surrendered, no dividends or
     other distributions payable to the holders of Weatherford Common Stock, as
     of any time on or after the Effective Time, shall be paid to the holders of
     such outstanding certificates that prior to the Effective Time represented
     Shares; PROVIDED, HOWEVER, that, upon surrender and exchange of such
     outstanding certificates, there shall be paid to the record holders of the
     certificates issued and exchanged therefor the amount, without interest
     thereon, of dividends and other distributions, if any, that theretofore
     were declared and became payable since the Effective Time with respect to
     the number of full shares of Weatherford Common Stock issued to such
     holders.

          (d)  All shares of Weatherford Common Stock into which the Shares
     shall have been converted pursuant to this Section 1.7 shall be issued in
     full satisfaction of all rights pertaining to such converted Shares.

          (e)  If any certificate for shares of Weatherford Common Stock is to
     be issued in a name other than that in which the certificate surrendered in
     exchange therefor is registered, it shall be a condition of the issuance
     thereof that the certificate so surrendered shall be properly endorsed and
     otherwise in proper form for transfer and that the person requesting such
     exchange shall have paid to Weatherford or its transfer agent any transfer
     or other taxes required by reason of the issuance of a certificate for
     shares of Weatherford Common Stock in any name other than that of the
     registered holder of the certificate surrendered, or established to the
     satisfaction of Weatherford or its transfer agent that such tax has been
     paid or is not payable.

          (f)  No fraction of a share of Weatherford Common Stock shall be
     issued, but in lieu thereof each holder of Shares who would otherwise be
     entitled to a fraction of a share of Weatherford Common Stock shall, upon
     surrender of


                                       -3-




<PAGE>

     the Shares held by such holder to Weatherford's transfer agent, be paid an
     amount in cash equal to the value of such fraction of a share based upon
     the closing price of Weatherford Common Stock on the New York Stock
     Exchange on the last trading day prior to the Effective Time.  No interest
     shall be paid on such amount.  All Shares held by a record holder other
     than nominee holders shall be aggregated for purposes of computing the
     number of shares of Weatherford Common Stock to be issued pursuant to this
     Section 1.7.

          (g)  None of Weatherford, Enterra, the Surviving Corporation or
     Weatherford's transfer agent shall be liable to a holder of the Shares for
     any amount properly paid to a public official pursuant to applicable
     property, escheat or similar law.

     1.8  TAKING OF NECESSARY ACTION; FURTHER ACTION.  The parties hereto shall
take all such reasonable and lawful action as may be necessary or appropriate to
effectuate the Merger as promptly as possible.  If, at any time after the
Effective Time, any such further action is necessary or desirable to carry out
the purposes of this Agreement and to vest the Surviving Corporation with full
right, title and possession to all assets, property, rights, privileges, powers
and franchises of Weatherford and Enterra, such corporations shall direct their
respective officers and directors to take all such lawful and necessary action.

                                   ARTICLE II
                         REPRESENTATIONS AND WARRANTIES

     2.1  CERTAIN DEFINITIONS.  As used in this Agreement, the following terms
shall have the meanings ascribed to them below:

          (a)  "Environmental Laws" shall mean all United States or foreign
     federal, state, local or municipal laws, rules, regulations, statutes,
     ordinances or orders of any governmental entity relating to (i) the control
     of any potential pollutant or protection of the air, water or land,
     (ii) solid, gaseous or liquid waste generation, handling, treatment,
     storage, disposal or transportation, and (iii) exposure to hazardous, toxic
     or other substances alleged to be harmful.  The term "Environmental Laws"
     shall include, but not be limited to, the Clean Air Act, 42 U.S.C. Section
     7401 et seq., the Clean Water Act, 33 U.S.C. Section 1251 et seq., the
     Resource Conservation and Recovery Act, 42 U.S.C. Section 6901, et seq.,
     the Toxic Substances Control Act, 15 U.S.C. Section 2601 et seq., the Safe
     Drinking Water Act, 42 U.S.C. Section 300f et seq. and the Comprehensive
     Environmental Response, Compensation and Liability Act ("CERCLA"),
     42 U.S.C. Section 9601 et seq.

          (b)  "Environmental Permit" shall mean any permit, license, approval,
     registration, identification number or other authorization with respect to
     any business or other operations conducted by Weatherford or any
     Weatherford Subsidiary (as defined in Section 2.2(a)) or Enterra or any
     Enterra Subsidiary (as defined in Section 2.3(a)), as the case may be,
     required under any applicable Environmental Law.


                                       -4-

<PAGE>

          (c)  "Hazardous Materials" shall mean any (i) petroleum or petroleum
     products, (ii) hazardous substance as defined pursuant to Section 101(14)
     of CERCLA or (iii) any other chemical, substance or waste that is regulated
     under any Environmental Law.

          (d)  "Material Adverse Change" with respect to any party shall mean a
     material adverse change in the business, financial condition or results of
     operations of such party and its subsidiaries, taken as a whole; PROVIDED,
     HOWEVER, that in no event shall the term "Material Adverse Change" be
     deemed to include (i) changes in national or international economic
     conditions or industry conditions generally, (ii) changes, or possible
     changes, in foreign, federal, state or local statutes and regulations
     applicable to Weatherford or Enterra, as the case may be, or (iii) the loss
     of employees, customers or suppliers by such party as a direct or indirect
     consequence of any announcement relating to the Merger.

          (e)  "Material Adverse Effect" on any party shall mean any material
     adverse effect on the business, financial condition or results of
     operations of such party and its subsidiaries, taken as a whole; PROVIDED,
     HOWEVER, that in no event shall the term "Material Adverse Effect" be
     deemed to include (i) changes in national or international economic
     conditions or industry conditions generally, (ii) changes, or possible
     changes, in foreign, federal, state or local statutes and regulations
     applicable to Weatherford or Enterra, as the case may be, or (iii) the loss
     of employees, customers or suppliers by such party as a direct or indirect
     consequence of any announcement relating to the Merger.

          (f)  "Permitted Liens" shall mean:  (i) liens for taxes not due and
     payable or which are being contested in good faith, (ii) mechanics',
     warehousemen's and other statutory liens incurred in the ordinary course of
     business and (iii) defects and irregularities in title and encumbrances
     that are not substantial in character or amount and do not materially
     impair the use of the property or asset in question.

     2.2  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD.  Weatherford hereby
represents and warrants to Enterra that, except as expressly contemplated by
this Agreement or as set forth in the disclosure letter delivered by Weatherford
to Enterra on the date hereof (the "Weatherford Disclosure Letter"):

          (a)  ORGANIZATION AND COMPLIANCE WITH LAW.  Weatherford and each of
     its corporate subsidiaries (the "Weatherford Subsidiaries") is a
     corporation duly organized, validly existing and in good standing under the
     laws of the jurisdiction in which it is organized and has all requisite
     corporate power and authority and all necessary governmental authorizations
     to own, lease and operate all of its properties and assets and to carry on
     its business as now being conducted, except where the failure to do so
     would not, either individually or in the aggregate, have a Material Adverse
     Effect.  Weatherford and each of the Weatherford Subsidiaries is duly
     qualified as a foreign corporation to do business, and is in good standing,
     in each jurisdiction in which the property



                                       -5-


<PAGE>

     owned, leased or operated by it or the nature of the business conducted by
     it makes such qualification necessary, except in such jurisdictions where
     the failure to do so does not and would not, either individually or in the
     aggregate, have a Material Adverse Effect.  Weatherford and each of the
     Weatherford Subsidiaries is in compliance with all applicable laws,
     judgments, orders, rules and regulations, domestic and foreign, except
     where failure to be in such compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect.  Weatherford has heretofore
     delivered to Enterra true and complete copies of Weatherford's Restated
     Certificate of Incorporation and bylaws, as in existence on the date
     hereof.

          (b)  CAPITALIZATION.

               (i)  The authorized capital stock of Weatherford consists of
          80,000,000 shares of Weatherford Common Stock, par value $.10 per
          share, and 1,000,000 shares of preferred stock, par value $1.00 per
          share.  As of June 21, 1995, there were issued and outstanding
          54,276,632 shares of Weatherford Common Stock (including shares deemed
          to be outstanding pending the exchange of shares of common stock of
          Petroleum Equipment Tools Co. and H&H Oil Tool Co., Inc.) and no
          shares of preferred stock, and 111,043 shares of Weatherford Common
          Stock were held as treasury shares, of which 82,783 shares were
          reserved for issuance pursuant to various stock option agreements.  As
          of June 21, 1995, there were reserved for issuance 2,299,414 shares of
          Weatherford Common Stock pursuant to stock option, employee stock
          purchase, 401(k) savings, stock incentive and restricted stock plans
          (collectively, the "Weatherford Options").  All issued shares of
          Weatherford Common Stock are validly issued, fully paid and
          nonassessable and no holder thereof is entitled to preemptive rights.
          Weatherford is not a party to, and, excluding agreements among various
          funds held or managed by institutional investors, has no knowledge of,
          any voting agreement, voting trust or similar agreement or arrangement
          relating to any class or series of its capital stock, or any agreement
          or arrangement providing for registration rights with respect to any
          capital stock or other securities of Weatherford.  All shares of
          Weatherford Common Stock to be issued pursuant to the Merger, when
          issued in accordance with this Agreement, will be validly issued,
          fully paid and nonassessable and will not violate the preemptive
          rights of any person.  All outstanding shares of capital stock of the
          Weatherford Subsidiaries are owned by Weatherford, free and clear of
          all liens, charges, encumbrances, adverse claims and options of any
          nature; provided, however, that Weatherford's ownership of shares of
          capital stock of certain foreign Weatherford Subsidiaries may be
          subject to Permitted Liens.

               (ii) Other than as set forth in this Section 2.2(b) and as
          contemplated by Section 3.1(b)(iii), there are not now, and at the
          Effective Time there will not be, any (A) shares of capital stock or
          other equity securities of Weatherford outstanding (other than
          Weatherford Common


                                       -6-

<PAGE>

     Stock issued pursuant to Weatherford Options as described herein) or
     (B) outstanding options, warrants, scrip, rights to subscribe for, calls or
     commitments of any character whatsoever relating to, or securities or
     rights convertible into or exchangeable for, shares of any class of capital
     stock of Weatherford, or contracts, understandings or arrangements to which
     Weatherford is a party, or by which it is or may be bound, to issue
     additional shares of its capital stock or options, warrants, scrip or
     rights to subscribe for, or securities or rights convertible into or
     exchangeable for, any additional shares of its capital stock.

          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT.  Weatherford has all
     requisite corporate power and authority to enter into this Agreement and to
     perform its obligations hereunder.  The execution and delivery by
     Weatherford of this Agreement and the consummation by it of the
     transactions contemplated hereby have been duly authorized by all necessary
     corporate action (subject only, with respect to the Merger, to adoption and
     approval of this Agreement by the stockholders of Weatherford as provided
     in Section 5.3(b)).  This Agreement has been duly executed and delivered by
     Weatherford and is the valid and binding obligation of Weatherford,
     enforceable against Weatherford in accordance with its terms, except as
     such enforceability may be limited or affected by (i) bankruptcy,
     insolvency, reorganization, moratorium, liquidation, arrangement,
     fraudulent transfer, fraudulent conveyance and other similar laws
     (including, without limitation, court decisions) now or hereafter in effect
     and affecting the rights and remedies of creditors generally or providing
     for the relief of debtors, (ii) the refusal of a particular court to grant
     equitable remedies, including, without limitation, specific performance and
     injunctive relief, and (iii) general principles of equity (regardless of
     whether such remedies are sought in a proceeding in equity or at law) and
     except as the enforceability of any indemnification provision contained in
     this Agreement may be limited by applicable federal or state securities
     laws.

          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS TO
     WHICH WEATHERFORD IS A PARTY.  Neither the execution and delivery of this
     Agreement nor the performance by Weatherford of its obligations hereunder,
     nor the consummation of the transactions contemplated hereby by
     Weatherford, will (i) conflict with Weatherford's Restated Certificate of
     Incorporation or bylaws; (ii) assuming satisfaction of the requirements set
     forth in clause (iii) below, violate any provision of law applicable to
     Weatherford; (iii) except for (A) requirements of Federal and state
     securities law, (B) requirements arising out of the Hart-Scott-Rodino
     Antitrust Improvements Act of 1976 (the "HSR Act"), (C) requirements of
     filings in such foreign jurisdictions as may be applicable and (D) the
     filing of a certificate of merger in accordance with the DGCL, require any
     consent or approval of, or filing with or notice to, any public body or
     authority, domestic or foreign, under any provision of law applicable to
     Weatherford; or (iv) require any consent, approval or notice under, or
     violate, breach, be in conflict with or constitute a default (or an event
     that, with notice or lapse of time or both, would constitute a default)
     under, or permit the termination of any provision of, or result in the
     creation or imposition of any


                                       -7-

<PAGE>

     lien upon any properties, assets or business of Weatherford under, any
     note, bond, indenture, mortgage, deed of trust, lease, franchise, permit,
     authorization, license, contract, instrument or other agreement or
     commitment or any order, judgment or decree to which Weatherford is a party
     or by which Weatherford or its assets or properties is bound or encumbered,
     except those that have already been given, obtained or filed and except in
     any of the cases enumerated in clauses (ii) through (iv), those that, in
     the aggregate, would not have a Material Adverse Effect.

          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS.  Since January 1, 1992,
     Weatherford and each of the Weatherford Subsidiaries have filed all
     reports, registration statements and other filings, together with any
     amendments required to be made with respect thereto, that they have been
     required to file with the Securities and Exchange Commission (the
     "Commission") under the Securities Act of 1933, as amended (the "Securities
     Act"), and the Securities Exchange Act of 1934, as amended (the "Exchange
     Act").  All reports, registration statements and other filings (including,
     without limitation, all notes, exhibits and schedules thereto and documents
     incorporated by reference therein) filed by Weatherford with the Commission
     since January 1, 1992 through the date of this Agreement, together with any
     amendments thereto, are sometimes collectively referred to as the
     "Weatherford Commission Filings".  Weatherford has heretofore delivered to
     Enterra copies of the Weatherford Commission Filings.  As of the
     effectiveness dates declared by the Commission, in the case of registration
     statements, as of the mailing dates, in the case of proxy statements, or as
     of the filing dates with the Commission, in the case of all other
     Weatherford Commission Filings, the Weatherford Commission Filings
     complied, and the Proxy Statement (as defined in Section 5.1) and the
     Registration Statement (as defined in Section 5.1) (except with respect to
     information concerning Enterra and the Enterra Subsidiaries furnished by or
     on behalf of Enterra to Weatherford specifically for use therein) will
     comply, in all material respects with the Securities Act, the Exchange Act
     and the rules and regulations of the Commission promulgated thereunder, as
     applicable, and did not or will not, as the case may be, contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements made therein, in
     light of the circumstances under which they were made, not misleading.

          All material contracts of Weatherford and the Weatherford Subsidiaries
     have been included in the Weatherford Commission Filings, except for those
     contracts not required to be filed pursuant to the rules and regulations of
     the Commission.

          Each of the audited consolidated financial statements (including,
     without limitation, any related notes or schedules) included or
     incorporated by reference in the Weatherford Commission Filings was, and
     each of the audited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement and the Registration
     Statement (except for those financial statements of Enterra and the Enterra
     Subsidiaries furnished by or on behalf of


                                       -8-

<PAGE>

     Enterra to Weatherford specifically for use therein) will be, prepared in
     accordance with generally accepted accounting principles applied on a
     consistent basis (except as may be noted therein or in the notes or
     schedules thereto), and fairly presents, or will fairly present, as the
     case may be, in all material respects, the consolidated financial position
     of Weatherford and the Weatherford Subsidiaries as of the dates thereof and
     the statements of income, cash flows and stockholders' equity for the
     periods then ended in accordance with generally accepted accounting
     principles.  Each of the unaudited interim financial statements included or
     incorporated by reference in the Weatherford Commission Filings was, and
     each of the unaudited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement and the Registration
     Statement (except for those financial statements of Enterra and the Enterra
     Subsidiaries furnished by or on behalf of Enterra to Weatherford
     specifically for use therein) will be, prepared in a manner consistent with
     the audited consolidated financial statements and generally accepted
     accounting principles.  As of the date hereof, Weatherford has no material
     liabilities, absolute or contingent, not reflected in the Weatherford
     Commission Filings, except (i) liabilities not required under generally
     accepted accounting principles to be reflected on such financial statements
     or the notes thereto and (ii) liabilities incurred in the ordinary course
     of business since the date of such financial statements consistent with
     past operations and not relating to the borrowing of money.

          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
     CHANGES AND EVENTS.  Since April 1, 1995, except as disclosed in the
     Weatherford Commission Filings filed with the Commission since that date,
     Weatherford and the Weatherford Subsidiaries have conducted their business
     only in the ordinary and usual course, and there has not been (i) any
     Material Adverse Change in Weatherford or any condition, event or
     development that reasonably may be expected to result in any Material
     Adverse Change; (ii) any change by Weatherford in its accounting methods,
     principles or practices; (iii) any revaluation by Weatherford or any of the
     Weatherford Subsidiaries of any of its or their assets, including, without
     limitation, writing down the value of inventory or writing off notes or
     accounts receivable other than in the ordinary course of business; (iv) any
     entry by Weatherford or any of the Weatherford Subsidiaries into any
     commitment or transaction material to Weatherford and the Weatherford
     Subsidiaries, taken as a whole, other than in the ordinary course of
     business; (v) any declaration, setting aside or payment of any dividends or
     distributions in respect of the Weatherford Common Stock, or any
     redemption, purchase or other acquisition of any of its securities or any
     securities of any of the Weatherford Subsidiaries; (vi) any damage,
     destruction or loss (whether or not covered by insurance) materially
     adversely affecting the properties or business of Weatherford and the
     Weatherford Subsidiaries, taken as a whole; (vii) any increase in
     indebtedness for borrowed money; (viii) any granting of a security interest
     or lien on any property or assets of Weatherford and the Weatherford
     Subsidiaries, other than Permitted Liens; or (ix) any increase in or
     establishment of any bonus, insurance, severance, deferred compensation,
     pension, retirement, profit sharing, stock option (including, without
     limitation,


                                       -9-

<PAGE>

     the granting of stock options, stock appreciation rights, performance
     awards or restricted stock awards), stock purchase or other employee
     benefit plan or any other increase in the compensation payable or to become
     payable to any officers or key employees of Weatherford or any of the
     Weatherford Subsidiaries.

          (g)  CERTAIN FEES.  Neither Weatherford nor any of its officers,
     directors or employees, on behalf of Weatherford or any of the Weatherford
     Subsidiaries or its or their respective Boards of Directors (or any
     committee thereof), has employed any financial advisor, broker or finder or
     incurred any liability for any financial advisory, brokerage or finders'
     fees or commissions in connection with the transactions contemplated
     hereby.

          (h)  LITIGATION.  Except as disclosed in the Weatherford Commission
     Filings, there are no claims, actions, suits, investigations or proceedings
     pending or, to the knowledge of Weatherford, threatened against or
     affecting Weatherford or any of the Weatherford Subsidiaries or any of
     their respective properties at law or in equity, or any of their respective
     employee benefit plans or fiduciaries of such plans, or before or by any
     federal, state, municipal or other governmental agency or authority, or
     before any arbitration board or panel, wherever located, that, individually
     or in the aggregate, if adversely determined would have a Material Adverse
     Effect, or that involve the risk of criminal liability.

          (i)  EMPLOYEE BENEFIT PLANS.  The Weatherford Disclosure Letter sets
     forth a complete and accurate list of:

               (i)    each "employee welfare benefit plan" (as such term is
          defined in Section 3(1) of the Employee Retirement Income Security Act
          of 1974, as amended ("ERISA")) (the "Weatherford Welfare Plans");

               (ii)   each "employee pension benefit plan" (as such term is
          defined in Section 3(2) of ERISA) (the "Weatherford Pension Plans");
          and

               (iii)  all other employee benefit agreements or arrangements,
          including, without limitation, deferred compensation plans, incentive
          plans, bonus plans or arrangements, stock option plans, stock purchase
          plans, golden parachute agreements, severance pay plans, dependent
          care plans, cafeteria plans, employee assistance programs, scholarship
          programs, employment contracts and other similar plans, agreements and
          arrangements (collectively, with the Weatherford Welfare Plans and the
          Weatherford Pension Plans, the "Weatherford Benefit Plans"),

     that are currently in effect or were maintained within three years of the
     Closing Date, or have been approved before this date but are not yet
     effective, for the benefit of directors, officers, employees or former
     employees (or their beneficiaries) of Weatherford, any of the Weatherford
     Subsidiaries incorporated in the United States (the "Weatherford U.S.
     Subsidiaries") or any member of a controlled group or affiliated service
     group (as defined in Section 414(b), (c), (m) or (o) of the Code) that is
     incorporated or domiciled in the United States of


                                      -10-

<PAGE>

     which Weatherford or any of the Weatherford U.S. Subsidiaries is a member
     (collectively, the "Weatherford Group").  Weatherford and the Weatherford
     U.S. Subsidiaries will provide to Enterra, as to each Weatherford Benefit
     Plan, as applicable, access to a complete and accurate copy of (i) such
     plan, agreement or arrangement; (ii) the trust, group annuity contract or
     other document that provides the funding for such plan; (iii) the most
     recent annual Form 5500, 990 and 1041 reports; (iv) the most recent
     actuarial report or valuation statement; (v) the most current summary plan
     description, handbook or other booklet that describes any Weatherford
     Benefit Plan, and any summary of material modifications prepared after each
     such summary plan description; (vi) the most recent Internal Revenue
     Service ("IRS") determination letter and all rulings or determinations
     requested from the IRS subsequent to the date of such determination letter;
     and (vii) all other pending correspondence from the IRS or the Department
     of Labor received by any member of the Weatherford Group that relates to
     such plan.

          Each Weatherford Welfare Plan and Weatherford Pension Plan (i) is in
     compliance with ERISA, including, without limitation, all reporting and
     disclosure requirements of Part 1 of Subtitle B of Title I of ERISA, except
     where the failure to be in compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect; (ii) is in compliance with
     the Code, except where the failure to be in compliance would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iii) has
     had the appropriate Form 5500 timely filed for any Weatherford Pension
     Plan, if applicable, for each year of its existence and for any Weatherford
     Welfare Plan for each year of its existence after 1987, except where the
     failure to cause such timely filing would not, either individually or in
     the aggregate, have a Material Adverse Effect; (iv) has not engaged in any
     transaction described in Section 406 or 407 of ERISA or Section 4975 of the
     Code unless it received or is entitled to an exemption under Section 408 of
     ERISA or Section 4975 of the Code, as applicable, or unless such
     transaction has been corrected and all applicable excise taxes paid or
     waived; (v) has no issue pending (other than the payment of benefits in the
     normal course or the qualification of the plan pursuant to an application
     pending before the IRS) nor any issue resolved adversely to the Weatherford
     Group that, in either case, may subject the Weatherford Group to the
     payment of a penalty, interest, tax or other amount, which, either
     individually or in the aggregate, would have a Material Adverse Effect; and
     (vi) can be unilaterally terminated or amended on no more than 90 days
     notice.  No notice has been received by the Weatherford Group of an
     increase or proposed increase in any premium relative to any Weatherford
     Benefit Plan, and no amendment to any Weatherford Benefit Plan within the
     last twelve months has increased the rate of employer contributions
     thereunder that, either individually or in the aggregate, would have a
     Material Adverse Effect.

          Each Weatherford Benefit Plan that is intended to be a voluntary
     employee benefit association has been submitted to and approved by the IRS
     as exempt from federal income tax under Section 501(c)(9) of the Code or
     the applicable submission period relating to any such plan will not have
     ended prior


                                      -11-

<PAGE>

     to the Closing.  No Weatherford Benefit Plan will cause the Weatherford
     Group to have liability for severance pay as a result of this Agreement.
     The Weatherford Group does not provide employee post-retirement medical or
     health coverage or contribute to or maintain any employee welfare benefit
     plan that provides for health benefit coverage following termination of
     employment except as required by Section 4980B(f) of the Code or other
     applicable statute, nor has the Weatherford Group made any representations,
     agreements, covenants or commitments to provide that coverage.

          Except for each Weatherford Pension Plan that is an ERISA top-hat
     plan, each Weatherford Pension Plan has been submitted to and approved as
     qualifying under Section 401(a) of the Code by the IRS or the applicable
     remedial amendment period relating to such plan will not have ended prior
     to the Closing.  To the knowledge of Weatherford, no facts have occurred
     that, if known by the IRS, could cause disqualification of any Weatherford
     Pension Plan.  Each Weatherford Pension Plan to which Section 412 of the
     Code is applicable fully complies with the funding requirements of that
     Section and there is no accumulated funding deficiency as defined in
     Section 302(a)(2) of ERISA (whether or not waived) in any such plan.  The
     Weatherford Group has paid all premiums (including, without limitation,
     interest, charges and penalties for late payment) due the Pension Benefit
     Guaranty Corporation (the "PBGC") with respect to each Weatherford Pension
     Plan for which premiums are required.  No Weatherford Pension Plan has been
     terminated under circumstances that would result in liability to the PBGC
     or the Weatherford Group.  There has been no "reportable event" (as defined
     in Section 4043(b) of ERISA and the regulations under that Section) with
     respect to any Weatherford Pension Plan subject to Title IV of ERISA.  With
     respect to each Weatherford Pension Plan subject to Title IV of ERISA, the
     Weatherford Group has not (i) ceased operations at a facility so as to
     become subject to the provisions of Section 4062(e) of ERISA,
     (ii) withdrawn as a substantial employer so as to become subject to the
     provisions of Section 4063 of ERISA or (iii) ceased making contributions on
     or before the Closing Date to any such plan subject to Section 4064(a) of
     ERISA to which the Weatherford Group made contributions at any time during
     the six years prior to the Closing Date.  Neither the Weatherford Group nor
     any member thereof has made a complete or partial withdrawal from a
     multiemployer plan (as defined in Section 3(37) of ERISA) so as to incur
     withdrawal liability as defined in Section 4201 of ERISA.

          Weatherford's subsidiaries incorporated outside of the United States
     and any benefit plans maintained by any of them for the benefit of their
     directors, officers, employees or former employees (or any of their
     beneficiaries) are in compliance with applicable laws pertaining to such
     plans in the jurisdictions of such subsidiaries, except where such failure
     to be in compliance would not, either individually or in the aggregate,
     have a Material Adverse Effect.

          (j)  TAXES.  All returns and reports, including, without limitation,
     information and withholding returns and reports ("Tax Returns") of or
     relating to any foreign, federal, state or local tax, assessment or other
     governmental


                                      -12-

<PAGE>

     charge ("Taxes" or a "Tax") that are required to be filed on or before the
     Closing Date by or with respect to Weatherford or any of the Weatherford
     Subsidiaries have been or will be duly and timely filed, and all Taxes,
     including, without limitation, interest and penalties, due and payable
     pursuant to such Tax Returns have been paid or adequately provided for in
     reserves established by Weatherford, except where the failure to file, pay
     or provide for would not, either individually or in the aggregate, have a
     Material Adverse Effect.  All Tax Returns of or with respect to Weatherford
     or any of the Weatherford Subsidiaries have been audited by the applicable
     governmental authority, or the applicable statute of limitations has
     expired, for all periods up to and including, without limitation, the tax
     year ended December 31, 1987.  There is no material claim against
     Weatherford or any of the Weatherford Subsidiaries with respect to any
     Taxes, and no material assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return of or with respect to
     Weatherford or any of the Weatherford Subsidiaries that has not been
     adequately provided for in reserves established by Weatherford.  The total
     amounts set up as liabilities for current and deferred Taxes in the
     consolidated financial statements included in the Weatherford Commission
     Filings have been prepared in accordance with generally accepted accounting
     principles and are sufficient to cover the payment of all material Taxes,
     including, without limitation, any penalties or interest thereon and
     whether or not assessed or disputed, that are, or are hereafter finally
     determined to be, or to have been, due with respect to the operations of
     Weatherford and the Weatherford Subsidiaries through the periods covered
     thereby.

          (k)  ENVIRONMENTAL.

               (i)    There are no facts, conditions or circumstances known to
          Weatherford that could cause Weatherford or any Weatherford Subsidiary
          to incur any loss, liability, damage, cost or expense, either
          individually or in the aggregate, in excess of Weatherford's charges,
          accruals and reserves for environmental matters reflected on
          Weatherford's consolidated balance sheet contained in the most recent
          Weatherford Commission Filing, for (A) violations of Environmental
          Laws, (B) failure to obtain an Environmental Permit, (C) a requirement
          to install environmental or pollution control equipment, (D) removal,
          response or remedial costs related to Hazardous Materials or
          (E) personal injury, property damage or natural resources damage
          resulting from exposure to or releases of Hazardous Materials, except
          in each case where such loss, liability, damage, cost or expense would
          not have a Material Adverse Effect.

               (ii)   The business and any other operations conducted by
          Weatherford or any Weatherford Subsidiary are in compliance with all
          applicable limitations, restrictions, conditions, standards,
          prohibitions, requirements and obligations established under
          applicable Environmental Laws, except where the failure to be in
          compliance would not, either individually or in the aggregate, have a
          Material Adverse Effect.


                                      -13-


<PAGE>

          (l)  NO SEVERANCE PAYMENTS.  None of Weatherford or the Weatherford
     Subsidiaries will owe a severance payment or similar obligation to any of
     their respective employees, officers or directors as a result of the Merger
     or the transactions contemplated by this Agreement, nor will any of such
     persons be entitled to an increase in severance payments or other benefits
     as a result of the Merger or the transactions contemplated by this
     Agreement in the event of the subsequent termination of their employment.

          (m)  VOTING REQUIREMENTS.  The affirmative vote of the holders of a
     majority of the outstanding shares of Weatherford Common Stock is the only
     vote of the holders of any class or series of the capital stock of
     Weatherford necessary to approve this Agreement and the Merger.

          (n)  INSURANCE.  The Weatherford Disclosure Letter sets forth all
     policies of insurance currently in effect relating to the business or
     operations of Weatherford and the Weatherford Subsidiaries.

          (o)  TITLE TO PROPERTY.  Except as set forth in the Weatherford
     Commission Filings, Weatherford and each of the Weatherford Subsidiaries
     have good and indefeasible title to all of their real properties purported
     to be owned in fee and good title to all their other material assets, free
     and clear of all mortgages, liens, charges and encumbrances other than
     Permitted Liens.

          (p)  WEATHERFORD ACTIONS.  As of the date hereof, the Board of
     Directors of Weatherford (at a meeting duly called and held) has resolved
     to recommend approval and adoption of this Agreement and the Merger by the
     stockholders of Weatherford.  Merrill Lynch & Co. has delivered to the
     Board of Directors of Weatherford its opinion that the Conversion Rate is
     fair to the holders of Weatherford Common Stock from a financial point of
     view.

     2.3  REPRESENTATIONS AND WARRANTIES OF ENTERRA.  Enterra hereby represents
and warrants to Weatherford that, except as expressly contemplated by this
Agreement or as set forth in the disclosure letter delivered by Enterra to
Weatherford on the date hereof (the "Enterra Disclosure Letter"):

          (a)  ORGANIZATION AND COMPLIANCE WITH LAW.  Enterra and each of its
     corporate subsidiaries (the "Enterra Subsidiaries") is a corporation duly
     organized, validly existing and in good standing under the laws of the
     jurisdiction in which it is organized and has all requisite corporate power
     and authority and all necessary governmental authorizations to own, lease
     and operate all of its properties and assets and to carry on its business
     as now being conducted, except where the failure to do so would not, either
     individually or in the aggregate, have a Material Adverse Effect.  Enterra
     and each of the Enterra Subsidiaries is duly qualified as a foreign
     corporation to do business, and is in good standing, in each jurisdiction
     in which the property owned, leased or operated by it or the nature of the
     business conducted by it makes such qualification necessary, except in such
     jurisdictions where the failure to do so does not and would not, either
     individually or in the aggregate, have a Material


                                      -14-

<PAGE>

     Adverse Effect.  Enterra and each of the Enterra Subsidiaries is in
     compliance with all applicable laws, judgments, orders, rules and
     regulations, domestic and foreign, except where failure to be in such
     compliance would not, either individually or in the aggregate, have a
     Material Adverse Effect.  Enterra has heretofore delivered to Weatherford
     true and complete copies of Enterra's Restated Certificate of Incorporation
     and bylaws, as in existence on the date hereof.

          (b)  CAPITALIZATION.

               (i)    The authorized capital stock of Enterra consists of
          40,000,000 shares of Enterra Common Stock, par value $1.00 per share,
          and 10,000,000 shares of series preferred stock, par value $1.00 per
          share.  As of June 21, 1995, there were issued and outstanding
          27,774,950 shares of Enterra Common Stock and no shares of series
          preferred stock, and no shares of Enterra Common Stock were held as
          treasury shares.  As of June 21, 1995, there were reserved for
          issuance 2,587,071 shares of Enterra Common Stock pursuant to stock
          option plans (collectively, the "Enterra Options").  All issued shares
          of Enterra Common Stock are validly issued, fully paid and
          nonassessable and no holder thereof is entitled to preemptive rights.
          Enterra is not a party to, and, excluding agreements among various
          funds held or managed by institutional investors, has no knowledge of,
          any voting agreement, voting trust or similar agreement or arrangement
          relating to any class or series of its capital stock, or any agreement
          or arrangement providing for registration rights with respect to any
          capital stock or other securities of Enterra.  All outstanding shares
          of capital stock of the Enterra Subsidiaries are owned by Enterra,
          free and clear of all liens, charges, encumbrances, adverse claims and
          options of any nature; provided, however, that Enterra's ownership of
          shares of capital stock of certain foreign Enterra Subsidiaries may be
          subject to Permitted Liens.

               (ii)   Other than as set forth in this Section 2.3(b) and as
          contemplated by Section 4.1(b)(iii), there are not now, and at the
          Effective Time there will not be, any (A) shares of capital stock or
          other equity securities of Enterra outstanding (other than Enterra
          Common Stock issued pursuant to Enterra Options as described herein)
          or (B) outstanding options, warrants, scrip, rights to subscribe for,
          calls or commitments of any character whatsoever relating to, or
          securities or rights convertible into or exchangeable for, shares of
          any class of capital stock of Enterra, or contracts, understandings or
          arrangements to which Enterra is a party, or by which it is or may be
          bound, to issue additional shares of its capital stock or options,
          warrants, scrip or rights to subscribe for, or securities or rights
          convertible into or exchangeable for, any additional shares of its
          capital stock.

          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT.  Enterra has all
     requisite corporate power and authority to enter into this Agreement and to
     perform its


                                      -15-

<PAGE>

     obligations hereunder.  The execution and delivery by Enterra of this
     Agreement and the consummation by it of the transactions contemplated
     hereby have been duly authorized by all necessary corporate action (subject
     only, with respect to the Merger, to adoption and approval of this
     Agreement by its stockholders as provided for in Section 5.3(a)).  This
     Agreement has been duly executed and delivered by Enterra and is the valid
     and binding obligation of Enterra, enforceable against Enterra in
     accordance with its terms, except as such enforceability may be limited or
     affected by (i) bankruptcy, insolvency, reorganization, moratorium,
     liquidation, arrangement, fraudulent transfer, fraudulent conveyance and
     other similar laws (including, without limitation, court decisions) now or
     hereafter in effect and affecting the rights and remedies of creditors
     generally or providing for the relief of debtors, (ii) the refusal of a
     particular court to grant equitable remedies, including, without
     limitation, specific performance and injunctive relief, and (iii) general
     principles of equity (regardless of whether such remedies are sought in a
     proceeding in equity or at law).

          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS TO
     WHICH ENTERRA IS A PARTY.  Neither the execution and delivery of this
     Agreement nor the performance by Enterra of its obligations hereunder, nor
     the consummation of the transactions contemplated hereby by Enterra, will
     (i) conflict with Enterra's Restated Certificate of Incorporation or
     bylaws; (ii) assuming satisfaction of the requirements set forth in
     clause (iii) below, violate any provision of law applicable to Enterra;
     (iii) except for (A) requirements of Federal and state securities law,
     (B) requirements arising out of the HSR Act, (C) requirements of filings in
     such foreign jurisdictions as may be applicable and (D) the filing of a
     certificate of merger in accordance with the DGCL, require any consent or
     approval of, or filing with or notice to, any public body or authority,
     domestic or foreign, under any provision of law applicable to Enterra; or
     (iv) require any consent, approval or notice under, or violate, breach, be
     in conflict with or constitute a default (or an event that, with notice or
     lapse of time or both, would constitute a default) under, or permit the
     termination of any provision of, or result in the creation or imposition of
     any lien upon any properties, assets or business of Enterra under, any
     note, bond, indenture, mortgage, deed of trust, lease, franchise, permit,
     authorization, license, contract, instrument or other agreement or
     commitment or any order, judgment or decree to which Enterra is a party or
     by which Enterra or any of its assets or properties is bound or encumbered,
     except those that have already been given, obtained or filed and except in
     any of the cases enumerated in clauses (ii) through (iv), those that, in
     the aggregate, would not have a Material Adverse Effect.

          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS.  Since January 1, 1992,
     Enterra and each of the Enterra Subsidiaries have filed all reports,
     registration statements and other filings, together with any amendments
     required to be made with respect thereto, that they have been required to
     file with the Commission under the Securities Act and the Exchange Act.
     All reports, registration statements and other filings (including, without
     limitation, all notes, exhibits and


                                      -16-

<PAGE>

     schedules thereto and documents incorporated by reference therein) filed by
     Enterra with the Commission since January 1, 1992 through the date of this
     Agreement, together with any amendments thereto, are sometimes collectively
     referred to as the "Enterra Commission Filings".  Enterra has heretofore
     delivered to Weatherford copies of the Enterra Commission Filings.  As of
     the effectiveness dates declared by the Commission, in the case of
     registration statements, as of the mailing dates, in the case of proxy
     statements, or as of the filing dates with the Commission, in the case of
     all other Enterra Commission Filings, the Enterra Commission Filings
     complied, and the Proxy Statement (except with respect to information
     concerning Weatherford and the Weatherford Subsidiaries furnished by or on
     behalf of Weatherford to Enterra specifically for use therein) will comply,
     in all material respects with the Securities Act, the Exchange Act and the
     rules and regulations of the Commission promulgated thereunder, as
     applicable, and did not or will not, as the case may be, contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements made therein, in
     light of the circumstances under which they were made, not misleading.

          All material contracts of Enterra and the Enterra Subsidiaries have
     been included in the Enterra Commission Filings, except for those contracts
     not required to be filed pursuant to the rules and regulations of the
     Commission.

          Each of the audited consolidated financial statements (including,
     without limitation, any related notes or schedules) included or
     incorporated by reference in the Enterra Commission Filings was, and each
     of the audited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement (except for those
     financial statements of Weatherford and the Weatherford Subsidiaries
     furnished by or on behalf of Weatherford to Enterra specifically for use
     therein) will be, prepared in accordance with generally accepted accounting
     principles applied on a consistent basis (except as may be noted therein or
     in the notes or schedules thereto), and fairly presents or will fairly
     present, as the case may be, in all material respects, the consolidated
     financial position of Enterra and the Enterra Subsidiaries as of the dates
     thereof and the statements of income, cash flows and stockholders' equity
     for the periods then ended in accordance with generally accepted accounting
     principles.  Each of the unaudited interim financial statements included or
     incorporated by reference in the Enterra Commission Filings was, and each
     of the unaudited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement (except for those
     financial statements of Weatherford and the Weatherford Subsidiaries
     furnished by or on behalf of Weatherford to Enterra specifically for use
     therein) will be, prepared in a manner consistent with the audited
     consolidated financial statements and generally accepted accounting
     principles.  As of the date hereof, Enterra has no material liabilities,
     absolute or contingent, not reflected in the Enterra Commission Filings,
     except (i) liabilities not required under generally accepted accounting
     principles to be reflected on such financial statements or the notes
     thereto and (ii) liabilities incurred in the ordinary course of business
     since the date of such financial


                                      -17-

<PAGE>

     statements consistent with past operations and not relating to the
     borrowing of money.

          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
     CHANGES AND EVENTS.  Since April 1, 1995, except as disclosed in the
     Enterra Commission Filings filed with the Commission since that date,
     Enterra and the Enterra Subsidiaries have conducted their business only in
     the ordinary and usual course, and there has not been (i) any Material
     Adverse Change in Enterra or any condition, event or development that
     reasonably may be expected to result in any Material Adverse Change;
     (ii) any change by Enterra in its accounting methods, principles or
     practices; (iii) any revaluation by Enterra or any of the Enterra
     Subsidiaries of any of its or their assets, including, without limitation,
     writing down the value of inventory or writing off notes or accounts
     receivable other than in the ordinary course of business; (iv) any entry by
     Enterra or any of the Enterra Subsidiaries into any commitment or
     transaction material to Enterra and the Enterra Subsidiaries, taken as a
     whole, other than in the ordinary course of business; (v) any declaration,
     setting aside or payment of any dividends or distributions in respect of
     the Enterra Common Stock, or any redemption, purchase or other acquisition
     of any of its securities or any securities of any of the Enterra
     Subsidiaries; (vi) any damage, destruction or loss (whether or not covered
     by insurance) materially adversely affecting the properties or business of
     Enterra and the Enterra Subsidiaries, taken as a whole; (vii) any increase
     in indebtedness for borrowed money; (viii) any granting of a security
     interest or lien on any property or assets of Enterra and the Enterra
     Subsidiaries, other than Permitted Liens; or (ix) any increase in or
     establishment of any bonus, insurance, severance, deferred compensation,
     pension, retirement, profit sharing, stock option (including, without
     limitation, the granting of stock options, stock appreciation rights,
     performance awards or restricted stock awards), stock purchase or other
     employee benefit plan or any other increase in the compensation payable or
     to become payable to any officers or key employees of Enterra or any of the
     Enterra Subsidiaries.

          (g)  CERTAIN FEES.  Neither Enterra nor any of its officers, directors
     or employees, on behalf of Enterra or any of the Enterra Subsidiaries or
     its or their respective Boards of Directors (or any committee thereof), has
     employed any financial advisor, broker or finder or incurred any liability
     for any financial advisory, brokerage or finders' fees or commissions in
     connection with the transactions contemplated hereby.

          (h)  LITIGATION.  Except as disclosed in the Enterra Commission
     Filings, there are no claims, actions, suits, investigations or proceedings
     pending or, to the knowledge of Enterra, threatened against or affecting
     Enterra or any of the Enterra Subsidiaries or any of their respective
     properties at law or in equity, or any of their respective employee benefit
     plans or fiduciaries of such plans, or before or by any federal, state,
     municipal or other governmental agency or authority, or before any
     arbitration board or panel, wherever located, that, individually or in the
     aggregate, if adversely determined would have a Material Adverse Effect, or
     that involve the risk of criminal liability.


                                      -18-

<PAGE>

          (i)  EMPLOYEE BENEFIT PLANS.  The Enterra Disclosure Letter sets forth
     a complete and accurate list of:

               (i)    each "employee welfare benefit plan" (as such term is
          defined in Section 3(1) of ERISA) (the "Enterra Welfare Plans");

               (ii)   each "employee pension benefit plan" (as such term is
          defined in Section 3(2) of ERISA) (the "Enterra Pension Plans"); and

               (iii)  all other employee benefit agreements or arrangements,
          including, without limitation, deferred compensation plans, incentive
          plans, bonus plans or arrangements, stock option plans, stock purchase
          plans, golden parachute agreements, severance pay plans, dependent
          care plans, cafeteria plans, employee assistance programs, scholarship
          programs, employment contracts and other similar plans, agreements and
          arrangements (collectively, with the Enterra Welfare Plans and the
          Enterra Pension Plans, the "Enterra Benefit Plans"),

     that are currently in effect or were maintained within three years of the
     Closing Date, or have been approved before this date but are not yet
     effective, for the benefit of directors, officers, employees or former
     employees (or their beneficiaries) of Enterra, any of the Enterra
     Subsidiaries incorporated in the United States (the "Enterra U.S.
     Subsidiaries") or any member of a controlled group or affiliated service
     group (as defined in Sections 414(b),(c),(m) and (o) of the Code) that is
     incorporated or domiciled in the United States of which Enterra or any of
     the Enterra U.S. Subsidiaries is a member (collectively, the "Enterra
     Group").  Enterra and the Enterra U.S. Subsidiaries will provide to
     Weatherford, as to each Enterra Benefit Plan, as applicable, access to a
     complete and accurate copy of (i) such plan, agreement or arrangement;
     (ii) the trust, group annuity contract or other document that provides the
     funding for such plan; (iii) the most recent annual Form 5500, 990 and 1041
     reports; (iv) the most recent actuarial report or valuation statement;
     (v) the most current summary plan description, handbook or other booklet
     that describes any Enterra Benefit Plan, and any summary of material
     modifications prepared after each such summary plan description; (vi) the
     most recent IRS determination letter and all rulings or determinations
     requested from the IRS subsequent to the date of such determination letter;
     and (vii) all other pending correspondence from the IRS or the Department
     of Labor received by any member of the Enterra Group that relates to such
     plan.

          Each Enterra Welfare Plan and Enterra Pension Plan (i) is in
     compliance with ERISA, including, without limitation, all reporting and
     disclosure requirements of Part 1 of Subtitle B of Title I of ERISA, except
     where the failure to be in compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect; (ii) is in compliance with
     the Code, except where the failure to be in compliance would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iii) has
     had the appropriate Form 5500 timely filed for any Enterra Pension Plan, if
     applicable, for each year of its existence


                                      -19-

<PAGE>

     and for any Enterra Welfare Plan for each year of its existence after 1987,
     except where the failure to cause such timely filing would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iv) has
     not engaged in any transaction described in Section 406 or 407 of ERISA or
     Section 4975 of the Code unless it received or is entitled to an exemption
     under Section 408 of ERISA or Section 4975 of the Code, as applicable, or
     unless such transaction has been corrected and all applicable excise taxes
     paid or waived; (v) has no issue pending (other than the payment of
     benefits in the normal course or the qualification of the plan pursuant to
     an application pending before the IRS) nor any issue resolved adversely to
     the Enterra Group that, in either case, may subject the Enterra Group to
     the payment of a penalty, interest, tax or other amount, which, either
     individually or in the aggregate, would have a Material Adverse Effect; and
     (vi) can be unilaterally terminated or amended on no more than 90 days
     notice.  No notice has been received by the Enterra Group of an increase or
     proposed increase in any premium relative to any Enterra Benefit Plan, and
     no amendment to any Enterra Benefit Plan within the last twelve months has
     increased the rate of employer contributions thereunder that, either
     individually or in the aggregate, would have a Material Adverse Effect.

          Each Enterra Benefit Plan that is intended to be a voluntary employee
     benefit association has been submitted to and approved by the IRS as exempt
     from federal income tax under Section 501(c)(9) of the Code or the
     applicable submission period relating to any such plan will not have ended
     prior to the Closing.  No Enterra Benefit Plan will cause the Enterra Group
     to have liability for severance pay as a result of this Agreement.  The
     Enterra Group does not provide employee post-retirement medical or health
     coverage or contribute to or maintain any employee welfare benefit plan
     that provides for health benefit coverage following termination of
     employment except as required by Section 4980B(f) of the Code or other
     applicable statute, nor has the Enterra Group made any representations,
     agreements, covenants or commitments to provide that coverage.

          Except for each Enterra Pension Plan that is an ERISA top-hat plan,
     each Enterra Pension Plan has been submitted to and approved as qualifying
     under Section 401(a) of the Code by the IRS or the applicable remedial
     amendment period relating to such plan will not have ended prior to the
     Closing.  To the knowledge of Enterra, no facts have occurred that, if
     known by the IRS, could cause disqualification of any Enterra Pension Plan.
     Each Enterra Pension Plan to which Section 412 of the Code is applicable
     fully complies with the funding requirements of that Section and there is
     no accumulated funding deficiency as defined in Section 302(a)(2) of ERISA
     (whether or not waived) in any such plan.  The Enterra Group has paid all
     premiums (including, without limitation, interest, charges and penalties
     for late payment) due the PBGC with respect to each Enterra Pension Plan
     for which premiums are required.  No Enterra Pension Plan has been
     terminated under circumstances that would result in liability to the PBGC
     or the Enterra Group.  There has been no "reportable event" (as defined in
     Section 4043(b) of ERISA and the regulations under that Section) with
     respect to any Enterra Pension Plan subject to Title IV of ERISA.


                                      -20-

<PAGE>

     With respect to each Enterra Pension Plan subject to Title IV of ERISA, the
     Enterra Group has not (i) ceased operations at a facility so as to become
     subject to the provisions of Section 4062(e) of ERISA, (ii) withdrawn as a
     substantial employer so as to become subject to the provisions of
     Section 4063 of ERISA or (iii) ceased making contributions on or before the
     Closing Date to any such plan subject to Section 4064(a) of ERISA to which
     the Enterra Group made contributions at any time during the six years prior
     to the Closing Date.  Neither the Enterra Group nor any member thereof has
     made a complete or partial withdrawal from a multiemployer plan (as defined
     in Section 3(37) of ERISA) so as to incur withdrawal liability as defined
     in Section 4201 of ERISA.

          Enterra's subsidiaries incorporated outside of the United States and
     any benefit plans maintained by any of them for the benefit of their
     directors, officers, employees or former employees (or any of their
     beneficiaries) are in compliance with applicable laws pertaining to such
     plans in the jurisdictions of such subsidiaries, except where such failure
     to be in compliance would not, either individually or in the aggregate,
     have a Material Adverse Effect.

          (j)  TAXES.  All Tax Returns of or relating to any Taxes that are
     required to be filed on or before the Closing Date by or with respect to
     Enterra or any of the Enterra Subsidiaries have been or will be duly and
     timely filed, and all Taxes, including, without limitation, interest and
     penalties, due and payable pursuant to such Tax Returns have been paid or
     adequately provided for in reserves established by Enterra, except where
     the failure to file, pay or provide for would not, either individually or
     in the aggregate, have a Material Adverse Effect.  All Tax Returns of or
     with respect to Enterra or any of the Enterra Subsidiaries have been
     audited by the applicable governmental authority, or the applicable statute
     of limitations has expired, for all periods up to and including, without
     limitation, the tax year ended December 31, 1987.  There is no material
     claim against Enterra or any of the Enterra Subsidiaries with respect to
     any Taxes, and no material assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return of or with respect to
     Enterra or any of the Enterra Subsidiaries that has not been adequately
     provided for in reserves established by Enterra.  The total amounts set up
     as liabilities for current and deferred Taxes in the consolidated financial
     statements included in the Enterra Commission Filings have been prepared in
     accordance with generally accepted accounting principles and are sufficient
     to cover the payment of all material Taxes, including, without limitation,
     any penalties or interest thereon and whether or not assessed or disputed,
     that are, or are hereafter finally determined to be, or to have been, due
     with respect to the operations of Enterra and the Enterra Subsidiaries
     through the periods covered thereby.

          (k)  ENVIRONMENTAL.

               (i)    There are no facts, conditions or circumstances known to
          Enterra that could cause Enterra or any Enterra Subsidiary to incur
          any loss, liability, damage, cost or expense, either individually or
          in the aggregate, in excess of Enterra's charges, accruals and
          reserves for


                                      -21-

<PAGE>

          environmental matters reflected on Enterra's consolidated balance
          sheet contained in the most recent Enterra Commission Filing, for
          (A) violations of Environmental Laws, (B) failure to obtain an
          Environmental Permit, (C) a requirement to install environmental or
          pollution control equipment, (D) removal, response or remedial costs
          related to Hazardous Materials or (E) personal injury, property damage
          or natural resources damage resulting from exposure to or releases of
          Hazardous Materials, except in each case where such loss, liability,
          damage, cost or expense would not have a Material Adverse Effect.

               (ii)   The business and any other operations conducted by Enterra
          or any Enterra Subsidiary are in compliance with all applicable
          limitations, restrictions, conditions, standards, prohibitions,
          requirements and obligations established under applicable
          Environmental Laws, except where the failure to be in compliance would
          not, either individually or in the aggregate, have a Material Adverse
          Effect.

          (l)  NO SEVERANCE PAYMENTS.  None of Enterra or the Enterra
     Subsidiaries will owe a severance payment or similar obligation to any of
     their respective employees, officers or directors as a result of the Merger
     or the transactions contemplated by this Agreement, nor will any of such
     persons be entitled to an increase in severance payments or other benefits
     as a result of the Merger or the transactions contemplated by this
     Agreement in the event of the subsequent termination of their employment.

          (m)  VOTING REQUIREMENTS.  The affirmative vote of the holders of a
     majority of the outstanding shares of Enterra Common Stock is the only vote
     of the holders of any class or series of the capital stock of Enterra
     necessary to approve this Agreement and the Merger.

          (n)  INSURANCE.  The Enterra Disclosure Letter sets forth all policies
     of insurance currently in effect relating to the business or operations of
     Enterra and the Enterra Subsidiaries.

          (o)  TITLE TO PROPERTY.  Except as set forth in the Enterra Commission
     Filings, Enterra and each of the Enterra Subsidiaries have good and
     indefeasible title to all of their real properties purported to be owned in
     fee and good title to all their other material assets, free and clear of
     all mortgages, liens, charges and encumbrances other than Permitted Liens.

          (p)  ENTERRA ACTIONS.  As of the date hereof, the Board of Directors
     of Enterra (at a meeting duly called and held) has resolved to recommend
     approval and adoption of this Agreement and the Merger by the stockholders
     of Enterra.  Simmons & Company International, Inc. has delivered to the
     Board of Directors of Enterra its opinion that the consideration to be
     received by the holders of Enterra Common Stock in the Merger is fair from
     a financial point of view to such holders.


                                      -22-

<PAGE>

                                   ARTICLE III
              COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME

     3.1  CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER.  Weatherford
covenants and agrees that, from the date of this Agreement until the Effective
Time, unless Enterra shall otherwise provide its prior consent in writing (which
consent shall not be unreasonably withheld) or as otherwise expressly
contemplated by this Agreement or as set forth in the Weatherford Disclosure
Letter:

          (a)  The business of Weatherford and the Weatherford Subsidiaries
     shall be conducted only in, and Weatherford and the Weatherford
     Subsidiaries shall not take any action except in, the ordinary course of
     business;

          (b)  Weatherford shall not, and shall not permit any of the
     Weatherford Subsidiaries to:

               (i)    split, combine or reclassify any outstanding capital stock
          of Weatherford, or authorize, declare, set aside or pay any dividend
          payable in cash, stock, property or otherwise in respect of the
          capital stock of Weatherford;

               (ii)   authorize or pay any extraordinary bonuses to employees;

               (iii)  grant any stock options or rights to acquire Weatherford
          Common Stock or common stock of any of the Weatherford Subsidiaries to
          any person or entity, other than options to purchase Weatherford
          Common Stock issued pursuant to employee stock option plans in amounts
          consistent with past practice;

               (iv)   authorize or issue, sell, pledge, dispose of or encumber
          any shares of capital stock of Weatherford or, except to Weatherford
          or a wholly-owned Weatherford Subsidiary, any of the Weatherford
          Subsidiaries, other than pursuant to Weatherford Options;

               (v)    sell, pledge, dispose of or encumber any assets of
          Weatherford or any of the Weatherford Subsidiaries, other than (A) in
          the ordinary course of business, (B) not relating to the borrowing of
          money, (C) with respect to purchase money security interests or (D)
          with respect to encumbered assets acquired in connection with an
          acquisition permitted under Section 3.1(b)(viii);

               (vi)   redeem, purchase, acquire or offer to acquire any shares
          of Weatherford Common Stock;

               (vii)  enter into, or grant any material change in, employment,
          compensation, benefit, severance, consulting or stay-bonus
          arrangements;


                                      -23-

<PAGE>

               (viii) acquire any corporation, partnership, other business
          organization or division thereof for a purchase price in excess of
          $5,000,000 or acquire corporations, partnerships, other business
          organizations or divisions thereof for an aggregate purchase price in
          excess of $15,000,000;

               (ix)   enter into any contract, agreement, commitment or
          arrangement other than in the ordinary course of business;

               (x)    authorize any capital expenditures other than in the
          ordinary course of business, and in accordance with a plan previously
          presented to, and not rejected by, the Weatherford Board of Directors;

               (xi)   incur any obligation for borrowed money or purchase money
          indebtedness, whether or not evidenced by a note, bond, debenture or
          similar instrument, except in the ordinary course of business, and in
          no event in excess of the unused credit available from time to time
          under existing credit facilities of Weatherford;

               (xii)  amend or propose to amend the charter or bylaws of
          Weatherford or any of the Weatherford Subsidiaries in which
          Weatherford, either directly or indirectly, has less than a 100%
          equity interest; or

               (xiii) take, and Weatherford shall use its reasonable efforts to
          prevent any affiliate of Weatherford from taking, any action that
          would prevent, including with the passage of time, the Merger's
          qualification for "pooling of interests" accounting treatment or
          prevent the Merger from being treated for federal income tax purposes
          as a reorganization within the meaning of Section 368(a) of the Code;

          (c)  Weatherford shall use all reasonable efforts (i) to preserve
     intact the business organization of Weatherford and each of the Weatherford
     Subsidiaries whose stock is pledged under existing credit facilities,
     (ii) to maintain in effect any material franchises, authorizations or
     similar rights of Weatherford and each of the Weatherford Subsidiaries,
     (iii) to keep available the services of the current officers and key
     employees of Weatherford and each of the Weatherford Subsidiaries, (iv) to
     preserve its goodwill with those having material business relationships
     with Weatherford and the Weatherford Subsidiaries, (v) to maintain and keep
     the material properties of Weatherford and each of the Weatherford
     Subsidiaries in as good a repair and condition as presently exists, except
     for deterioration due to ordinary wear and tear and damage due to casualty,
     and (vi) to maintain in full force and effect insurance comparable in
     amount and scope of coverage to that currently maintained by Weatherford
     and the Weatherford Subsidiaries; and

          (d)  Weatherford shall not, and shall not permit any of the
     Weatherford Subsidiaries to, take any action that would, or that reasonably
     could be expected


                                      -24-

<PAGE>

     to, result in any of the representations and warranties set forth in this
     Agreement becoming untrue or any of the conditions to the Merger set forth
     in Article VI not being satisfied.  Weatherford promptly shall advise
     Enterra orally and in writing of any change or event having, or which,
     insofar as reasonably can be foreseen, would have, a Material Adverse
     Effect on Weatherford.

     3.2  ACCESS TO INFORMATION.  From the date hereof to the Effective Time,
Weatherford shall, and shall cause the Weatherford Subsidiaries and its and
their officers, directors, employees and representatives to, afford the
representatives of Enterra complete access during normal business hours to its
officers, employees, representatives, properties, books and records, and shall
furnish Enterra all financial, operating and other data and information as
Enterra, through its representatives, reasonably may request; PROVIDED, HOWEVER,
that notwithstanding the foregoing provisions of this Section 3.2 or any other
provision of this Agreement, Weatherford shall not be required to provide to
Enterra any information that is the subject of a confidentiality agreement and
that relates primarily to a party other than Weatherford, a Weatherford
Subsidiary or a former subsidiary of Weatherford.

     3.3  AFFILIATES' AGREEMENTS.  Weatherford will use its reasonable efforts
to cause each stockholder who, in the opinion of counsel to Weatherford, is an
"affiliate" of Weatherford to enter into an agreement substantially in the form
of Exhibit 3.3.

     3.4  RESERVATION OF WEATHERFORD COMMON STOCK.  Weatherford shall reserve
for issuance, out of its authorized but unissued capital stock, such number of
shares of Weatherford Common Stock as may be issuable upon consummation of the
Merger.

     3.5  STOCK EXCHANGE LISTING.  Weatherford shall use all reasonable efforts
to cause the shares of Weatherford Common Stock to be issued upon consummation
of the Merger to be approved for listing on the New York Stock Exchange, subject
to official notice of issuance, prior to the Closing Date.

                                   ARTICLE IV
                COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME

     4.1  CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER.  Enterra covenants
and agrees that, from the date of this Agreement until the Effective Time,
unless Weatherford shall otherwise provide its prior consent in writing (which
consent shall not be unreasonably withheld) or as otherwise expressly
contemplated by this Agreement or as set forth in the Enterra Disclosure Letter:

          (a)  The business of Enterra and the Enterra Subsidiaries shall be
     conducted only in, and Enterra and the Enterra Subsidiaries shall not take
     any action except in, the ordinary course of business;

          (b)  Enterra shall not, and shall not permit any of the Enterra
     Subsidiaries to:



                                      -25-

<PAGE>

               (i)    split, combine or reclassify any outstanding capital stock
          of Enterra, or authorize, declare, set aside or pay any dividend
          payable in cash, stock, property or otherwise in respect of the
          capital stock of Enterra;

               (ii)   authorize or pay any extraordinary bonuses to employees;

               (iii)  grant any stock options or rights to acquire Enterra
          Common Stock or common stock of any of the Enterra Subsidiaries to any
          person or entity, other than options to purchase Enterra Common Stock
          issued pursuant to employee stock option plans in amounts consistent
          with past practice;

               (iv)   authorize or issue, sell, pledge, dispose of or encumber
          any shares of capital stock of Enterra or, except to Enterra or a
          wholly-owned Enterra Subsidiary, any of the Enterra Subsidiaries,
          other than pursuant to Enterra Options;

               (v)    sell, pledge, dispose of or encumber any assets of Enterra
          or any of the Enterra Subsidiaries, other than (A) in the ordinary
          course of business, (B) not relating to the borrowing of money,
          (C) with respect to purchase money security interests or (D) with
          respect to encumbered assets acquired in connection with an
          acquisition permitted under Section 4.1(b)(viii);

               (vi)   redeem, purchase, acquire or offer to acquire any shares
          of Enterra Common Stock;

               (vii)  enter into, or grant any material change in, employment,
          compensation, benefit, severance, consulting or stay-bonus
          arrangements;

               (viii) acquire any corporation, partnership, other business
          organization or division thereof for a purchase price in excess of
          $5,000,000 or corporations, partnerships, other business organizations
          or divisions thereof for an aggregate purchase price in excess of
          $15,000,000;

               (ix)   enter into any contract, agreement, commitment or
          arrangement other than in the ordinary course of business;

               (x)    authorize any capital expenditures other than in the
          ordinary course of business, and in accordance with a plan previously
          presented to, and not rejected by, the Enterra Board of Directors;

               (xi)   incur any obligation for borrowed money or purchase money
          indebtedness, whether or not evidenced by a note, bond, debenture or
          similar instrument, except in the ordinary course of business, and in
          no event in excess of the unused credit available from time to time
          under existing credit facilities of Enterra;


                                      -26-

<PAGE>

               (xii)  amend or propose to amend the charter or bylaws of Enterra
          or any of the Enterra Subsidiaries in which Enterra, either directly
          or indirectly, has less than a 100% equity interest; or

               (xiii) take, and Enterra shall use its reasonable efforts to
          prevent any affiliate of Enterra from taking, any action that would
          prevent, including with the passage of time, the Merger's
          qualification for "pooling of interests" accounting treatment or
          prevent the Merger from being treated for federal income tax purposes
          as a reorganization within the meaning of Section 368(a) of the Code;

          (c)  Enterra shall use its reasonable efforts (i) to preserve intact
     the business organization of Enterra and each of the Enterra Subsidiaries
     whose stock is pledged under existing credit facilities, (ii) to maintain
     in effect any material franchises, authorizations or similar rights of
     Enterra and each of the Enterra Subsidiaries, (iii) to keep available the
     services of the current officers and key employees of Enterra and each of
     the Enterra Subsidiaries, (iv) to preserve its goodwill with those having
     material business relationships with Enterra and the Enterra Subsidiaries,
     (v) to maintain and keep the material properties of Enterra and each of the
     Enterra Subsidiaries in as good a repair and condition as presently exists,
     except for deterioration due to ordinary wear and tear and damage due to
     casualty, and (vi) to maintain in full force and effect insurance
     comparable in amount and scope of coverage to that currently maintained by
     Enterra and each of the Enterra Subsidiaries; and

          (d)  Enterra shall not, and shall not permit any of the Enterra
     Subsidiaries to, take any action that would, or that reasonably could be
     expected to, result in any of the representations and warranties set forth
     in this Agreement becoming untrue or any of the conditions to the Merger
     set forth in Article VI not being satisfied.  Enterra promptly shall advise
     Weatherford orally and in writing of any change or event having, or which,
     insofar as reasonably can be foreseen, would have, a Material Adverse
     Effect on Enterra.

     4.2  ACCESS TO INFORMATION.  From the date hereof to the Effective Time,
Enterra shall, and shall cause the Enterra Subsidiaries and its and their
officers, directors, employees and representatives to, afford the
representatives of Weatherford complete access during normal business hours to
its officers, employees, representatives, properties, books and records, and
shall furnish Weatherford all financial, operating and other data and
information as Weatherford, through its representatives, reasonably may request;
PROVIDED, HOWEVER, that notwithstanding the foregoing provisions of this
Section 4.2 or any other provision of this Agreement, Enterra shall not be
required to provide to Weatherford any information that is the subject of a
confidentiality agreement and that relates primarily to a party other than
Enterra, an Enterra Subsidiary or a former subsidiary of Enterra.

     4.3  AFFILIATES' AGREEMENTS.  Enterra will use its reasonable efforts to
cause each stockholder who, in the opinion of counsel to Enterra, is an
"affiliate" of Enterra to enter into an agreement substantially in the form of
Exhibit 4.3.


                                      -27-

<PAGE>

                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

     5.1  JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT.  As promptly
as practicable after the execution of this Agreement, Weatherford and Enterra
shall prepare and file with the Commission preliminary proxy materials that
shall constitute the joint proxy statement (the "Proxy Statement") of
Weatherford and Enterra and the registration statement with respect to the
Weatherford Common Stock to be issued in connection with the Merger (the
"Registration Statement").  As promptly as practicable after comments are
received from the Commission on the preliminary proxy materials, Weatherford and
Enterra shall file with the Commission a combined joint proxy statement and
registration statement on Form S-4 (or on such other form as shall be
appropriate) relating to the approval and adoption of the Merger and this
Agreement by the stockholders of Weatherford and the stockholders of Enterra and
the issuance by Weatherford of Weatherford Common Stock in connection with the
Merger and shall use their reasonable efforts to cause the Registration
Statement to become effective as soon as practicable.  Subject to the terms and
conditions set forth in Section 7.2, the Proxy Statement shall contain a
statement that the Board of Directors of Enterra recommended that the
stockholders of Enterra approve and adopt the Merger and this Agreement.
Subject to the terms and conditions set forth in Section 7.1, the Proxy
Statement shall contain a statement that the Board of Directors of Weatherford
recommended that the stockholders of Weatherford approve and adopt the Merger
and this Agreement.

     5.2  COMFORT LETTERS.

          (a)  Enterra shall use its reasonable efforts to cause to be delivered
     to Weatherford a letter of KPMG Peat Marwick LLP dated as of a date within
     five business days before the date on which the Registration Statement
     shall become effective and addressed to Weatherford, in form and substance
     reasonably satisfactory to Weatherford and customary in scope and substance
     for "comfort" letters delivered by independent public accountants in
     connection with registration statements and proxy statements similar to the
     Registration Statement and Proxy Statement.

          (b)  Weatherford shall use its reasonable efforts to cause to be
     delivered to Enterra a letter of Arthur Andersen LLP dated as of a date
     within five business days before the date on which the Registration
     Statement shall become effective and addressed to Enterra, in form and
     substance reasonably satisfactory to Enterra and customary in scope and
     substance for "comfort" letters delivered by independent public accountants
     in connection with registration statements and proxy statements similar to
     the Registration Statement and Proxy Statement.

     5.3  MEETINGS OF STOCKHOLDERS.

          (a)  Enterra shall promptly take all action reasonably necessary in
     accordance with the DGCL and its Restated Certificate of Incorporation and


                                      -28-

<PAGE>

     bylaws to convene a meeting of its stockholders to consider and vote upon
     the adoption and approval of the Merger and this Agreement.  Subject to the
     terms and conditions set forth in Section 7.2, the Board of Directors of
     Enterra (i) shall recommend at such meeting that the stockholders of
     Enterra vote to adopt and approve the Merger and this Agreement, (ii) shall
     use its reasonable efforts to solicit from stockholders of Enterra proxies
     in favor of such adoption and approval and (iii) shall take all other
     action reasonably necessary to secure a vote of its stockholders in favor
     of the adoption and approval of the Merger and this Agreement.

          (b)  Weatherford shall promptly take all action reasonably necessary
     in accordance with the DGCL and its Restated Certificate of Incorporation
     and bylaws to convene a meeting of its stockholders to consider and vote
     upon the adoption and approval of the Merger and this Agreement.  Subject
     to the terms and conditions set forth in Section 7.1, the Board of
     Directors of Weatherford (i) shall recommend at such meeting that the
     stockholders of Weatherford vote to adopt and approve the Merger and this
     Agreement, (ii) shall use its reasonable efforts to solicit from
     stockholders of Weatherford proxies in favor of such adoption and approval
     and (iii) shall take all other action reasonably necessary to secure a vote
     of its stockholders in favor of the adoption and approval of the Merger and
     this Agreement.

          (c)  Weatherford and Enterra shall coordinate and cooperate with
     respect to the timing of such meetings and shall endeavor to hold such
     meetings on the same day and as soon as practicable after the date hereof.

     5.4  REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS.  Upon the terms
and subject to the conditions set forth in this Agreement, each of the parties
agrees to use reasonable efforts to take, or cause to be taken, all actions, and
to do, or cause to be done, and to assist and cooperate with the other party in
doing, all things necessary, proper or advisable (a) to consummate and make
effective, in the most expeditious manner practicable, the Merger, and the other
transactions contemplated by this Agreement, including, without limitation,
(i) the obtaining of all necessary consents, approvals or waivers required in
connection with the authorization, execution and delivery of this Agreement and
the consummation of the Merger (provided that no such consent, approval or
waiver shall require such party to take any action that would impair the value
that such party reasonably attributes to the Merger) and (ii) the execution and
delivery of any additional instruments (including, without limitation, any
required supplemental indentures) necessary to consummate the transactions
contemplated by this Agreement; and (b) to defend any non-regulatory lawsuits or
other legal proceedings, whether judicial or administrative, challenging this
Agreement or the consummation of the transactions contemplated hereby,
including, without limitation, seeking to have any stay or temporary restraining
order entered by any court or other governmental entity vacated or reversed.


                                      -29-

<PAGE>

     5.5  ANTITRUST MATTERS.  The obligations of each of the parties to this
Agreement shall include the following:

          (a)  each of the parties hereto shall file a premerger notification
     and report form pursuant to the HSR Act with respect to the Merger as
     promptly as reasonably possible following execution and delivery of this
     Agreement.  Each of the parties agrees to use best efforts to promptly
     respond to any request for additional information pursuant to
     Section (e)(1) of the HSR Act; and

          (b)  each party hereto will furnish to the other copies of all
     correspondence, filings or communications between that party, or any of its
     representatives, on the one hand, and any governmental agency or authority,
     on the other hand, with respect to pre-notification obligations under any
     antitrust law with respect to this Agreement or the Merger; PROVIDED,
     HOWEVER, that with respect to any documents that the party reasonably
     believes should not be disclosed to the other party, the party shall
     instead furnish those documents to counsel for the other party pursuant to
     a mutually satisfactory confidentiality agreement.

     5.6  NOTIFICATION OF CERTAIN MATTERS.  Enterra shall give prompt notice to
Weatherford, and Weatherford shall give prompt notice to Enterra, orally and in
writing, of (a) the occurrence, or failure to occur, of any event which
occurrence or failure would be likely to cause any representation or warranty
contained in this Agreement to be untrue or inaccurate at any time from the date
hereof to the Effective Time, (b) any material failure of Enterra or
Weatherford, as the case may be, or any officer, director, employee or agent
thereof, to comply with or satisfy any covenant, condition or agreement to be
complied with or satisfied by it hereunder, and (c) any fact or event that would
make it necessary to amend the Registration Statement or the Proxy Statement to
render the statements therein not misleading or to comply with applicable law.


     5.7  AGREEMENT TO DEFEND.  In the event any claim, action, suit,
investigation or other proceeding by any governmental body or other person or
other legal or administrative proceeding is commenced that questions the
validity or legality of the transactions contemplated hereby or seeks damages in
connection therewith, whether before or after the Effective Time, the parties
hereto agree to cooperate and use their reasonable efforts to defend against and
respond thereto; PROVIDED, HOWEVER, that this Section 5.7 shall not apply to any
governmental investigation contemplated under Section 5.5(a).

     5.8  EXPENSES.  Subject to the terms and conditions set forth in
Section 7.3, and except as otherwise agreed to in writing by the parties, all
costs and expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such
expenses.


                                      -30-

<PAGE>

     5.9  INDEMNIFICATION.

          (a)  After the Effective Time Weatherford and the Surviving
     Corporation shall, to the fullest extent permitted under applicable law,
     defend, indemnify and hold harmless each person who is now, or has been at
     any time prior to the date hereof or who becomes prior to the Effective
     Time, an officer or director of Enterra or any of the Enterra Subsidiaries
     (each, an "Indemnified Party" and, collectively, the "Indemnified Parties")
     against (i) all costs or expenses (including, without limitation,
     reasonable attorneys' fees), judgments, fines, losses, claims, damages,
     liabilities and amounts paid in settlement in connection with any claim,
     action, suit, proceeding or investigation, whether civil, criminal,
     administrative or investigative, based in whole or in part on, or arising
     in whole or in part out of, the fact that such person is or was an officer
     or director, whether pertaining to any matter existing or occurring at or
     prior to the Effective Time and whether asserted or claimed prior to, or at
     or after, the Effective Time (collectively, the "Indemnified Liabilities");
     and (ii) all Indemnified Liabilities based in whole or in part on, or
     arising in whole or in part out of, or pertaining to, this Agreement, the
     Merger or the transactions contemplated hereby.  After the Effective Time,
     Weatherford and the Surviving Corporation will be entitled to participate
     in and, to the extent that it may wish, to assume the defense of any
     action, with counsel reasonably satisfactory to the Indemnified Party;
     PROVIDED, HOWEVER, if any Indemnified Party believes that, by reason of an
     actual or potential conflict of interest, it is advisable for such
     Indemnified Party to be represented by separate counsel, or if Weatherford
     or the Surviving Corporation shall fail after the Effective Time to assume
     responsibility for such defense, such Indemnified Party may retain counsel
     reasonably satisfactory to Weatherford and the Surviving Corporation who
     will represent such Indemnified Party, and Weatherford and the Surviving
     Corporation shall pay all reasonable fees and disbursements of such counsel
     promptly as statements therefor are received to the fullest extent
     permitted by applicable law upon receipt of any undertaking contemplated by
     Section 145(e) of the DGCL.  The Indemnified Party, Weatherford and the
     Surviving Corporation will cooperate with each other and use their
     reasonable efforts to assist each other in the vigorous defense of any such
     matter; PROVIDED, HOWEVER, that neither Weatherford nor the Surviving
     Corporation shall be liable for any settlement of any claim effected
     without its written consent, which consent, however, shall not be
     unreasonably withheld.  Any Indemnified Party wishing to claim
     indemnification under this Section 5.9, upon learning of any such claim,
     action, suit, proceeding or investigation, shall promptly notify
     Weatherford or the Surviving Corporation, as applicable (but the failure to
     be so notified by an Indemnified Party shall not relieve an indemnifying
     party from any liability that it may have under this Section 5.9 except to
     the extent such failure materially prejudices such indemnifying party).
     The indemnifying parties shall be required to pay for only one law firm (in
     addition to any required local counsel) selected by the Indemnified Parties
     as a group in accordance with the foregoing provisions with respect to each
     such matter unless there is, under applicable standards of professional
     conduct, a conflict in any significant issue between the positions of any
     two or more Indemnified Parties.  This Section 5.9 is intended


                                      -31-

<PAGE>

     to be for the benefit of, and shall be enforceable by, each Indemnified
     Party, his or her heirs and his or her representatives.

          (b)  For a period of six years after the Effective Time, the Surviving
     Corporation shall use its best efforts to maintain in effect director and
     officer liability insurance for the benefit of the Indemnified Parties in
     comparable amounts, with comparable deductibles or retained amounts and
     with comparable coverages and exclusions as currently maintained by
     Enterra; PROVIDED, HOWEVER, that if the Surviving Corporation is unable to
     obtain insurance for such period for an aggregate premium of $1,000,000 or
     less or if such insurance otherwise cannot be obtained or maintained by the
     Surviving Corporation, then the Surviving Corporation's obligation pursuant
     hereto shall only be to seek to be obtained the best possible coverage
     under the circumstances subject to the foregoing limitation on premiums.

          (c)  All rights and obligations under this Section 5.9 shall be in
     addition to any rights an Indemnified Party may have under the Restated
     Certificate of Incorporation or bylaws of Enterra as in effect on the date
     hereof, or pursuant to any other agreement, arrangement or document in
     effect prior to the Effective Time.  The provisions of this Section 5.9 are
     intended to benefit, and may be enforced by, all Indemnified Parties, and
     their respective heirs and representatives.  This Section 5.9 shall be
     binding upon all successors and assigns of Enterra, Weatherford and the
     Surviving Corporation.

          (d)  If the Surviving Corporation is sold to a third party, such third
     party shall expressly assume the Surviving Corporation's indemnification
     obligation under this Section 5.9.

     5.10 POST-EFFECTIVE TIME MAILING.  As soon as practicable following the
Effective Time, the Surviving Corporation will cause to be mailed to each holder
of certificates that represented Enterra Common Stock prior to the Effective
Time, at such holder's address as it appears on Enterra's stock transfer
records, a letter of transmittal and other information advising such holder of
the consummation of the Merger and to enable such holder to effect the exchange
of stock certificates as contemplated by Article I of this Agreement.

     5.11 STOCKHOLDERS' AGREEMENT.  Weatherford will enter into a Stockholders'
Agreement, and an amendment thereto, with First Reserve Corporation and the
various First Reserve Funds (as defined therein), in the forms attached hereto
as Exhibits 5.11(a) and 5.11(b), respectively.

     5.12 ENTERRA STOCK OPTIONS.  At the Effective Time, each Enterra Option
that remains as of such date unexercised in whole or in part shall be replaced
by a substitute option, granted under an existing Weatherford stock option plan,
to purchase that number of shares of Weatherford Common Stock determined by
multiplying the number of shares of Enterra Common Stock subject to such Enterra
Option by the Conversion Rate and multiplying the exercise price per share of
such Enterra Option by a fraction the numerator of which is one and the
denominator of which is the Conversion Rate.


                                      -32-

<PAGE>

Each such substitute option shall otherwise replicate the terms and conditions
of the Enterra Option it replaces.  Weatherford shall take all corporate action
necessary (a) to reserve for issuance a sufficient number of shares of
Weatherford Common Stock for delivery upon exercise of such Enterra Options,
(b) to ensure that all shares of Weatherford Common Stock subject to such
Enterra Options are issued pursuant to a plan that complies with the exemption
provided by Rule 16b-3 promulgated under the Exchange Act and (c) to ensure that
shares of Weatherford Common Stock issued pursuant to the exercise of such
Enterra Options are registered under the Securities Act, listed on the New York
Stock Exchange and may be freely transferred by the holders thereof.

     5.13 ENTERRA EMPLOYEE BENEFITS.

          (a)  For the period beginning at the Effective Time and ending on
     June 30, 1996, Weatherford will either (i) cause to remain in effect all
     Enterra Benefit Plans, as in effect at the Effective Time, or (ii) provide
     benefits to employees of Enterra and the Enterra Subsidiaries under the
     Weatherford Benefit Plans that are substantially comparable to the benefits
     provided to such employees under the Enterra Benefit Plans, as in effect at
     the Effective Time.  From and after July 1, 1996, Weatherford agrees that
     participation in the Weatherford Benefit Plans, as then in effect, shall be
     made available to all Weatherford employees, including employees who were
     employees of Enterra, and that such plans will provide the same or
     substantially comparable benefits to all similarly situated employees.

          (b)  If participation in any Weatherford Benefit Plan is made
     available to employees of Enterra or any Enterra Subsidiary, all service
     with Enterra and the Enterra Subsidiaries prior to the Effective Time and
     any other service recognized under the applicable Enterra Benefit Plans for
     vesting and eligibility purposes shall be credited to such employees and
     all waiting periods and pre-existing condition limitations shall be waived
     under such Weatherford Benefit Plan.

          (c)  Prior to the Effective Time, Enterra shall have established the
     Enterra Special Severance Pay Plan, in the form attached hereto as
     Exhibit 5.13.

          (d)  Weatherford agrees that it shall make non-elective employer
     contributions, including fixed or discretionary pension, profit sharing and
     matching contributions, to each Enterra Benefit Plan that is intended to be
     a qualified defined contribution plan under Section 401(a) of the Code for
     the respective Enterra Benefit Plan's first plan year ending on or after
     the Effective Time in accordance with the terms of such plan.  Weatherford
     agrees that the rate of each such non-elective employer contribution in
     each case shall not be less than the rate of such non-elective employer
     contribution that was made to the respective Enterra Benefit Plan for the
     last plan year ending prior to the Effective Time.  An employee of Enterra
     or an Enterra Subsidiary who is employed, and who is a participant in an
     Enterra Benefit Plan that is subject to this Section 5.13(d), on the day
     before the Effective Time (an "Eligible Enterra


                                      -33-

<PAGE>

     Employee") shall be entitled to receive an allocation of such non-elective
     employer contributions without regard to whether such employee continues to
     be an employee of Enterra or an Enterra Subsidiary or any successor thereto
     on the last day of the respective Enterra Benefit Plan's plan year (or
     other period) for which such contributions are to be made.  Weatherford
     agrees to make any amendment to the applicable Enterra Benefit Plans as may
     be necessary to effectuate the terms of this Section 5.13(d).

     5.14 UPDATE OF DISCLOSURE LETTERS.

          (a)  Weatherford shall promptly disclose to Enterra in writing (i) any
     information set forth in the Weatherford Disclosure Letter with respect to
     subsections (b), (c), (e) and (g) of Section 2.2 that no longer is accurate
     and with respect to all other subsections of Section 2.2 that no longer is
     accurate in any material respect and (ii) any information of the nature of
     that set forth in the Weatherford Disclosure Letter that arises between the
     date hereof and the Closing and that would have been required to be
     included in the Weatherford Disclosure Letter if such information had
     existed and been known or available on the date hereof.  Neither any such
     new disclosure, nor the determination of Enterra to proceed with the Merger
     in spite of any such new disclosure, shall relieve Weatherford from any
     liability for any prior misrepresentation or breach of warranty.

          (b)  Enterra shall promptly disclose to Weatherford in writing (i) any
     information set forth in the Enterra Disclosure Letter with respect to
     subsections (b), (c), (e) and (g) of Section 2.3 that no longer is accurate
     and with respect to all other subsections of Section 2.3 that no longer is
     accurate in any material respect and (ii) any information of the nature of
     that set forth in the Enterra Disclosure Letter that arises between the
     date hereof and the Closing and that would have been required to be
     included in the Enterra Disclosure Letter if such information had existed
     and been known or available on the date hereof.  Neither any such new
     disclosure, nor the determination of Weatherford to proceed with the Merger
     in spite of any such new disclosure, shall relieve Enterra from any
     liability for any prior misrepresentation or breach of warranty.

     5.15 WEATHERFORD SPECIAL SEVERANCE PAY PLAN.  Prior to the Effective Time,
Weatherford shall have established the Weatherford Special Severance Pay Plan,
in the form attached hereto as Exhibit 5.15.

     5.16 CHANGE OF CONTROL AGREEMENTS.  Weatherford shall, as of the Effective
Time, have entered into change of control agreements, substantially in the form
of Exhibit 5.16(a), with the persons and for the respective severance benefits
set forth on Exhibit 5.16(b).

     5.17 INDEMNIFICATION AGREEMENTS.  Weatherford shall, as of the Effective
Time, have entered into indemnification agreements, substantially in the form of
Weatherford's existing indemnification agreements with the persons set forth on
Exhibit 5.17.


                                      -34-


<PAGE>

     5.18 ENTERRA EMPLOYEE BONUSES.

          (a)  The Enterra Board of Directors or the Executive Compensation
     Committee of the Enterra Board of Directors (the "Enterra Committee") shall
     determine, prior to the Closing Date, the final amount of bonuses to be
     paid to the Enterra employees listed on Exhibit 5.18 for the fiscal year
     ended December 31, 1993, such amount not to exceed the amount that
     previously has been accrued for such bonuses.  Such bonuses shall be paid
     only after collection of at least $10,000,000 of the disputed outstanding
     receivables from Kuwait Oil Company.  If such bonuses are not paid prior to
     the Closing Date, (i) the determination of the Enterra Board of Directors
     or the Enterra Committee, as the case may be, will be binding upon
     Weatherford, (ii) any Enterra employee terminated after such date shall
     receive the entire amount of the bonus determined by the Enterra Board of
     Directors or the Enterra Committee, as the case may be, and (iii) payment
     of such bonuses shall be administered by Messrs. William E. Macaulay and
     Robert L. Parker, Sr., who will be directors of the Surviving Corporation.

          (b)  The Enterra Board of Directors or the Enterra Committee shall
     declare, prior to the Closing Date, the amount of bonuses to Enterra
     employees, based upon Enterra's achievement of certain financial and other
     targets for Enterra for the fiscal year ending December 31, 1995,
     determined by the Enterra Board of Directors or the Enterra Committee, as
     the case may be, in a manner consistent with the Enterra and Total Energy
     Services Company bonus plans under which bonuses were paid for the fiscal
     year ended December 31, 1994.  The final amount of bonuses shall be
     determined by the Enterra Board of Directors or the Enterra Committee, as
     the case may be, if audited financial results for the year ending
     December 31, 1995 are known prior to the Closing Date, or by Messrs.
     Macaulay and Parker, if such results are not known until after the Closing
     Date.  Bonuses will be paid not earlier than February 1, 1996 and not later
     than February 28, 1996.  Any Enterra employee terminated after the Closing
     Date shall receive the entire amount of the bonus.

          (c)  In addition to the 1995 bonuses referenced in Section 5.18(b),
     Enterra may pay bonuses to Enterra employees in an amount not to exceed
     $1,000,000 in the aggregate.  The recipients and amounts of such bonuses
     shall be determined in the sole discretion of the Enterra Committee;
     PROVIDED, HOWEVER, that the total amount paid to any one employee shall not
     exceed the aggregate of the current annualized salary and most recent
     annual bonus of such employee.

     5.19 ENTERRA SEVERANCE AGREEMENTS.

          (a)  Each of the Enterra severance agreements with the individuals set
     forth on Exhibit 5.19(a)(i) shall be amended, pursuant to the form attached
     hereto as Exhibit 5.19(a)(ii), and each of the Enterra severance agreements
     with the individuals set forth on Exhibit 5.19(a)(iii) shall be amended,
     pursuant to the form attached hereto as Exhibit 5.19(a)(iv).


                                      -35-

<PAGE>

          (b)  The parties agree that, as a result of the Merger, any
     resignation by any of M. Timothy Carey, Steven C. Grant, Edward C. Grimes,
     Steven W. Krablin, J. Joseph Percle and Michael L. Stansberry at any time
     from the Effective Time through August 12, 1996 shall constitute a
     "Termination upon Change of Control" (as such term is defined in the
     severance agreement between such person and Enterra).  Further, it is
     agreed that, for purposes of Section 3(a)(ii) of the severance agreement
     between Enterra and each such individual, if the bonus for the 1993 fiscal
     year is required to be taken into account, the final amount of the 1993
     bonus determined by the Enterra Board of Directors or the Enterra Committee
     pursuant to Section 5.18(a) shall be counted, notwithstanding whether the
     disputed receivables from Kuwait Oil Company have been collected.  It is
     further agreed that the manner in which the obligation to provide extended
     medical and dental benefits under Section 4(b) of each such individual's
     severance agreement with Enterra shall be to pay to such individual during
     the full period for which such benefits are required to be extended a
     monthly amount equal to the difference between the applicable COBRA
     continuation premium for such benefits and the premium, if any, charged to
     the individual for such benefits immediately prior to the Change in Control
     (as defined in such severance agreement) and such individual shall pay the
     full premium to the plan.

     5.20 ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.

          (a)  Weatherford shall, as of the Effective Time, have entered into
     definitive arrangements with D. Dale Wood reflecting the principal terms
     set forth in Exhibit 5.20.

          (b)  If the implementation of the principal terms set forth in Exhibit
     5.20 shall make the Merger ineligible for pooling-of-interests accounting
     treatment under Accounting Principles Bulletin No. 16, Enterra agrees to
     use its best efforts to negotiate a package that would provide Mr. Wood in
     the aggregate with a substantially similar economic benefit.

     5.21 WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.
Weatherford shall, as of the Effective Time, pay Philip Burguieres a fee in the
amount set forth in Exhibit 5.21.  If Mr. Burguieres' fee set forth in Exhibit
5.21 shall make the Merger ineligible for pooling-of-interests accounting
treatment under Accounting Principles Bulletin No. 16, Weatherford agrees to use
its best efforts to negotiate an alternative package with Mr. Burguieres.

     5.22 BOARD OF DIRECTORS.

          (a)  The Board of Directors of Weatherford will take action prior to
     the Effective Time to cause the number of directors comprising the full
     Board of Directors of the Surviving Corporation at the Effective Time to be
     increased to ten persons, and the five persons listed on Exhibit 5.22 as
     the Enterra designees to the Board of Directors of the Surviving
     Corporation shall be elected to the Board of Directors of the Surviving
     Corporation by the Weatherford Board of


                                      -36-

<PAGE>

     Directors effective at the Effective Time, such increase in number and such
     election to be subject to the Closing.  The Weatherford Board of Directors
     will also take action prior to the Effective Time to cause the committees
     of the Board of Directors of the Surviving Corporation at the Effective
     Time to be the committees listed on Exhibit 1.6(a) hereto, having the
     membership noted on such Exhibit, such action to be subject to the Closing.
     If prior to the Effective Time, any Enterra designee for director set forth
     on Exhibit 5.22, or if during the two years after the Effective Time, any
     Enterra designated director shall decline or be unable to serve as a
     director of the Surviving Corporation, the other Enterra designees or the
     remaining Enterra designated directors, as the case may be, shall designate
     another person to serve in such person's stead, subject to the approval of
     a majority of the Weatherford designated directors at that time, which
     approval shall not be unreasonably withheld.  Weatherford agrees that,
     during the two year period after the Effective Time, it shall cause at
     least one Enterra designee listed on Exhibit 5.22 (or his successor chosen
     pursuant to this Section 5.22(a)) to be a member of each of the Executive
     and Nominating Committee, Audit Committee and Compensation and Stock Plans
     Committee of the Board of Directors of the Surviving Corporation.
     Weatherford shall take all appropriate action for two years after the
     Effective Time to assist in the nomination for election as directors of the
     Enterra designees listed on Exhibit 5.22 (or any successor chosen pursuant
     to this Section 5.22(a)).

          (b)  Each person designated by Enterra to serve on the Board of
     Directors of the Surviving Corporation, and any person subsequently
     appointed to the Board of Directors of the Surviving Corporation by such
     designees pursuant to Section 5.22(a), shall be covered by the Weatherford
     International Incorporated Non-Employee Director Retirement Plan and the
     prior service of any such person on the Enterra Board of Directors shall
     count as service on the Board of Directors of the Surviving Corporation for
     all purposes under such plan.

          (c)  If prior to the Effective Time, any Weatherford designee for
     director set forth on Exhibit 5.22, or if during the two years after the
     Effective Time, any Weatherford designated director shall decline or be
     unable to serve as a director of the Surviving Corporation, the other
     Weatherford designees or the remaining Weatherford designated directors, as
     the case may be, shall designate another person to serve in such person's
     stead, subject to the approval of a majority of the Enterra designated
     directors at that time, which approval shall not be unreasonably withheld.

                                   ARTICLE VI
                                   CONDITIONS

     6.1  CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER.  The
respective obligations of each party to effect the Merger shall be subject to
the fulfillment or waiver at or prior to the Closing Date of the following
conditions:


                                      -37-

<PAGE>

          (a)  This Agreement and the Merger shall have been approved and
     adopted by the requisite vote of the stockholders of Weatherford and the
     stockholders of Enterra as may be required by law and by any applicable
     provisions of their respective certificates of incorporation or bylaws;

          (b)  The waiting period (and any extension thereof) applicable to the
     consummation of the Merger under the HSR Act shall have expired or been
     terminated;

          (c)  No order shall have been entered and remain in effect in any
     action or proceeding before any foreign, federal or state court or
     governmental agency or other foreign, federal or state regulatory or
     administrative agency or commission that would prevent or make illegal the
     consummation of the Merger;

          (d)  The Registration Statement shall be effective on the Closing
     Date, and all post-effective amendments filed shall have been declared
     effective or shall have been withdrawn; and no stop order suspending the
     effectiveness thereof shall have been issued and no proceedings for that
     purpose shall have been initiated or, to the knowledge of the parties,
     threatened by the Commission;

          (e)  There shall have been obtained any and all material permits,
     approvals and consents of securities or blue sky commissions of any
     jurisdiction, and of any other governmental body or agency, that reasonably
     may be deemed necessary so that the consummation of the Merger and the
     transactions contemplated thereby will be in compliance with applicable
     laws, the failure to comply with which would have a Material Adverse Effect
     on Enterra or Weatherford; and

          (f)  All approvals of private persons, financial institutions or
     corporations, (i) the granting of which is necessary for the consummation
     of the Merger or the transactions contemplated in connection therewith and
     (ii) the non-receipt of which would have a Material Adverse Effect on
     Enterra or Weatherford, shall have been obtained.

     6.2  ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD.  The obligation
of Weatherford to effect the Merger is, at the option of Weatherford, also
subject to the fulfillment or waiver at or prior to the Closing Date of the
following conditions:

          (a)  The representations and warranties of Enterra contained in
     subsections (b), (c), (e) and (g) of Section 2.3 shall be accurate, and the
     representations and warranties of Enterra contained in all other
     subsections of Section 2.3 shall be accurate in all material respects
     (except to the extent qualified by materiality, in which case such
     representations and warranties shall be accurate), as of the Closing Date
     as though such representations and warranties had been made at and as of
     that time (except where any such representation or warranty is made as of a
     date specifically set forth therein); all of the terms, covenants and
     conditions of this Agreement to be complied with and performed by Enterra
     on or before the Closing Date shall have been duly


                                      -38-

<PAGE>

     complied with and performed in all material respects; and a certificate of
     Enterra to the foregoing effect dated the Closing Date and signed by the
     chief executive officer of Enterra shall have been delivered to
     Weatherford;

          (b)  Since the date of this Agreement, no Material Adverse Change of
     Enterra shall have occurred, and Weatherford shall have received a
     certificate of Enterra signed by the chief executive officer of Enterra
     dated the Closing Date to such effect;

          (c)  Weatherford shall have been advised in writing as of the date of
     this Agreement and as of the Closing Date (i) by Arthur Andersen LLP that,
     in accordance with generally accepted accounting principles and applicable
     rules and regulations of the Commission, Weatherford is eligible to be a
     party to a merger accounted for as a "pooling of interests" and that Arthur
     Andersen LLP is not aware of any matters that prohibit the use of "pooling
     of interests" accounting in connection with the Merger and (ii) by KPMG
     Peat Marwick LLP that, in accordance with generally accepted accounting
     principles and applicable rules and regulations of the Commission, no
     conditions exist that would preclude Weatherford's accounting for the
     Merger with Enterra as a "pooling of interests" as those conditions relate
     to Enterra;

          (d)  Enterra shall have received, and furnished written copies to
     Weatherford of, the Enterra affiliates' agreements pursuant to Section 4.3;

          (e)  Weatherford shall have received from Morgan, Lewis & Bockius,
     counsel to Enterra, an opinion dated the Effective Time covering the
     matters set forth in Exhibit 6.2(e);

          (f)  Weatherford shall have received a copy of the "comfort letter" of
     KPMG Peat Marwick LLP pursuant to Section 5.2(a) and on or prior to the
     Closing Date an additional letter from KPMG Peat Marwick LLP dated as of
     the Closing Date, in form and substance reasonably satisfactory to
     Weatherford, stating that nothing has come to their attention, as of a date
     no earlier than five days prior to the Closing Date, which would require
     any change in their letter delivered pursuant to Section 5.2(a) if it were
     required to be dated and delivered on the Closing Date;

          (g)  The Board of Directors of Weatherford shall have received from
     Merrill Lynch & Co. a written opinion, dated as of the date of this
     Agreement, in form and substance reasonably satisfactory to the Board of
     Directors of Weatherford, to the effect that the Conversion Rate is fair to
     the holders of Weatherford Common Stock from a financial point of view,
     which opinion shall have been confirmed in writing to such Board as of the
     date the Proxy Statement is first mailed to the stockholders of Weatherford
     and not subsequently withdrawn;

          (h)  Weatherford shall have received from Fulbright & Jaworski L.L.P.,
     counsel to Weatherford, a written opinion dated as of the date that the
     Proxy


                                      -39-

<PAGE>

     Statement is first mailed to stockholders of Weatherford to the effect that
     (i) the Merger will be treated for federal income tax purposes as a
     reorganization within the meaning of Section 368(a) of the Code, (ii)
     Weatherford and Enterra will each be a party to that reorganization within
     the meaning of Section 368(b) of the Code and (iii) Weatherford and Enterra
     shall not recognize any gain or loss as a result of the Merger, and such
     opinion shall not have been withdrawn or modified in any material respect;

          (i)  The Stockholders' Agreement among Enterra, First Reserve
     Corporation and the various First Reserve Funds shall have been in full
     force and effect, and the stockholders of Enterra named therein shall not
     be in breach of any of the material terms thereof, immediately prior to the
     Closing; and

          (j)  D. Dale Wood shall have entered into definitive arrangements
     reflecting the principal terms set forth in Exhibit 5.20.

     6.3  ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA.  The obligation of
Enterra to effect the Merger is, at the option of Enterra, also subject to the
fulfillment or waiver at or prior to the Closing Date of the following
conditions:

          (a)  The representations and warranties of Weatherford contained in
     subsections (b), (c), (e) and (g) of Section 2.2 shall be accurate, and the
     representations and warranties of Weatherford contained in all other
     subsections of Section 2.2 shall be accurate in all material respects
     (except to the extent qualified by materiality, in which case such
     representations and warranties shall be accurate), as of the Closing Date
     as though such representations and warranties had been made at and as of
     that time (except where any such representation or warranty is made as of a
     date specifically set forth therein); all of the terms, covenants and
     conditions of this Agreement to be complied with and performed by
     Weatherford on or before the Closing Date shall have been duly complied
     with and performed in all material respects; and a certificate of
     Weatherford to the foregoing effect dated the Closing Date and signed by
     the chief executive officer of Weatherford shall have been delivered to
     Enterra;

          (b)  Since the date of this Agreement, no Material Adverse Change of
     Weatherford shall have occurred, and Enterra shall have received a
     certificate of Weatherford signed by the chief executive officer of
     Weatherford dated the Closing Date to such effect;

          (c)  Enterra shall have been advised in writing as of the date of this
     Agreement and as of the Closing Date (i) by Arthur Andersen LLP that, in
     accordance with generally accepted accounting principles and applicable
     rules and regulations of the Commission, Weatherford is eligible to be a
     party to a merger accounted for as a "pooling of interests" and that Arthur
     Andersen LLP is not aware of any matters that prohibit the use of "pooling
     of interests" accounting in connection with the Merger and (ii) by KPMG
     Peat Marwick LLP that, in accordance with generally accepted accounting
     principles and applicable rules and regulations of the Commission, no
     conditions exist that would preclude


                                      -40-

<PAGE>

     Weatherford's accounting for the Merger with Enterra as a "pooling of
     interests" as those conditions relate to Enterra;

          (d)  Weatherford shall have received, and furnished written copies to
     Enterra of, the Weatherford affiliates' agreements pursuant to Section 3.3;

          (e)  Enterra shall have received from Fulbright & Jaworski L.L.P.,
     counsel to Weatherford, an opinion dated the Effective Time covering the
     matters set forth in Exhibit 6.3(e);

          (f)  Enterra shall have received a copy of the "comfort letter" of
     Arthur Andersen LLP pursuant to Section 5.2(b) and on or prior to the
     Closing Date an additional letter from Arthur Andersen LLP dated as of the
     Closing Date, in form and substance reasonably satisfactory to Enterra,
     stating that nothing has come to their attention, as of a date no earlier
     than five days prior to the Closing Date, which would require any change in
     their letter delivered pursuant to Section 5.2(b) if it were required to be
     dated and delivered on the Closing Date;

          (g)  The Board of Directors of Enterra shall have received from
     Simmons & Company International, Inc. a written opinion, dated as of the
     date of this Agreement, in form and substance reasonably satisfactory to
     the Board of Directors of Enterra, to the effect that the consideration to
     be received by the holders of Enterra Common Stock in the Merger is fair
     from a financial point of view to such holders, which opinion shall have
     been confirmed in writing to such Board as of the date the Proxy Statement
     is first mailed to the stockholders of Enterra and not subsequently
     withdrawn;

          (h)  Enterra shall have received from Morgan, Lewis & Bockius, counsel
     to Enterra, a written opinion dated as of the date that the Proxy Statement
     is first mailed to stockholders of Enterra to the effect that (i) the
     Merger will be treated for federal income tax purposes as a reorganization
     within the meaning of Section 368(a) of the Code, (ii) Weatherford and
     Enterra will each be a party to that reorganization within the meaning of
     Section 368(b) of the Code and (iii) the stockholders of Enterra shall not
     recognize any gain or loss as a result of the Merger, other than to the
     extent such stockholders receive cash in lieu of fractional shares, and
     such opinion shall not have been withdrawn or modified in any material
     respect;

          (i)  The shares of Weatherford Common Stock to be issued upon
     consummation of the Merger shall have been approved for listing on the New
     York Stock Exchange, subject to official notice of issuance; and

          (j)  Each of the Weatherford Change of Control Agreements set forth on
     Exhibit 6.3(j)(i) shall be amended, pursuant to the form attached hereto as
     Exhibit 6.3(j)(ii).


                                      -41-

<PAGE>

                                   ARTICLE VII
                    SPECIAL PROVISIONS AS TO CERTAIN MATTERS

     7.1  NO SOLICITATION BY WEATHERFORD.

          (a)  Weatherford shall not, nor shall it permit any of its
     subsidiaries to, nor shall it authorize or permit any officer, director,
     employee, investment banker, attorney or other advisor, agent or
     representative of Weatherford or any of its subsidiaries to, directly or
     indirectly, (i) solicit, initiate or encourage the submission of any
     Weatherford Takeover Proposal (as hereinafter defined), (ii) enter into any
     agreement with respect to any Weatherford Takeover Proposal, or
     (iii) participate in any discussions or negotiations regarding, or furnish
     to any person any information with respect to, the making of any proposal
     that constitutes, or may reasonably be expected to lead to, any Weatherford
     Takeover Proposal; PROVIDED, HOWEVER, that prior to the vote of
     stockholders of Weatherford for approval and adoption of this Agreement and
     the Merger, Weatherford may take any actions described in the foregoing
     clause (iii) to the extent that the Board of Directors of Weatherford
     determines, in good faith after consultation with outside counsel, that
     failure to take such actions could reasonably be expected to result in a
     breach of the Board's fiduciary obligations.  Without limiting the
     foregoing, it is understood that any violation of the restrictions set
     forth in the preceding sentence by any officer, director or employee of
     Weatherford or any of the Weatherford Subsidiaries or any investment
     banker, attorney or other advisor, agent or representative of Weatherford,
     whether or not such person is purporting to act on behalf of Weatherford or
     otherwise, shall be deemed to be a material breach of this Agreement by
     Weatherford.  For purposes of this Agreement, a "Weatherford Takeover
     Proposal" means (i) any proposal or offer, other than a proposal or offer
     by Enterra or any of its affiliates, for a merger or other business
     combination involving Weatherford, (ii) any proposal or offer, other than a
     proposal or offer by Enterra or any of its affiliates, to acquire from
     Weatherford or any of its affiliates in any manner, directly or indirectly,
     more than 30% of the voting stock of Weatherford or any Weatherford
     Subsidiary or a material amount of the assets of Weatherford and the
     Weatherford Subsidiaries, taken as a whole, or (iii) any proposal or offer,
     other than a proposal or offer by Enterra or any of its affiliates, to
     acquire from the stockholders of Weatherford by tender offer, exchange
     offer or otherwise more than 30% of the outstanding voting stock of
     Weatherford.

          (b)  Neither the Board of Directors of Weatherford nor any committee
     thereof shall (i) withdraw or modify, or propose to withdraw or modify, in
     a manner adverse to Enterra the approval or recommendation by the Board of
     Directors of Weatherford or any such committee of this Agreement or the
     Merger or take any action having such effect or (ii) approve or recommend,
     or propose to approve or recommend, any Weatherford Takeover Proposal.
     Notwithstanding the foregoing, if the Board of Directors of Weatherford
     receives a Weatherford Takeover Proposal that, in the exercise of its
     fiduciary obligations (as determined in good faith after consultation with
     outside counsel), it


                                      -42-

<PAGE>

     determines to be a Weatherford Superior Proposal (as hereinafter defined),
     the Board of Directors of Weatherford may withdraw or modify its approval
     or recommendation of this Agreement or the Merger and may (subject to the
     following sentence) terminate this Agreement, in each case at any time
     after the fifth business day following Enterra's receipt of written notice
     (a "Weatherford Notice of Superior Proposal") advising Enterra that the
     Board of Directors of Weatherford has received a Weatherford Takeover
     Proposal that it has determined to be a Weatherford Superior Proposal,
     specifying the principal terms and conditions of such Weatherford Superior
     Proposal and identifying the person making such Weatherford Superior
     Proposal.  Weatherford may terminate this Agreement pursuant to the
     preceding sentence only if the stockholders of Weatherford shall not yet
     have voted upon the Merger and Weatherford shall have paid to Enterra the
     Termination Fee (as defined in Section 7.3(a)).  Nothing contained herein
     shall prohibit Weatherford from taking and disclosing to its stockholders a
     position contemplated by Rule 14e-2(a) of the Exchange Act provided that
     Weatherford does not withdraw or modify its position with respect to the
     Merger or take any action having such effect or approve or recommend a
     Weatherford Takeover Proposal.  For purposes of this Agreement, a
     "Weatherford Superior Proposal" means any bona fide Weatherford Takeover
     Proposal to merge with or acquire, directly or indirectly, all of the
     voting stock then outstanding or all or substantially all of the assets of
     Weatherford, and otherwise on terms that the Board of Directors of
     Weatherford determines in its good faith reasonable judgment (based on the
     written advice of a financial advisor of nationally recognized reputation)
     to be more favorable to Weatherford's stockholders than the Merger.

          (c)  If the Board of Directors of Weatherford or any committee thereof
     shall (i) withdraw or modify, or propose to withdraw or modify, in a manner
     adverse to Enterra the approval or recommendation by the Board of Directors
     of Weatherford or any such committee of this Agreement or the Merger or
     take any action having such effect or (ii) approve or recommend, or propose
     to approve or recommend, any Weatherford Takeover Proposal, Enterra may
     terminate this Agreement.

          (d)  In addition to the obligations of Weatherford set forth in
     Section 7.1(b), Weatherford shall promptly advise Enterra orally and in
     writing of any negotiations or discussions, entered into in reliance on the
     proviso to the first sentence of Section 7.1(a).

     7.2  NO SOLICITATION BY ENTERRA.

          (a)  Enterra shall not, nor shall it permit any of its subsidiaries
     to, nor shall it authorize or permit any officer, director, employee,
     investment banker, attorney or other advisor, agent or representative of
     Enterra or any of its subsidiaries to, directly or indirectly, (i) solicit,
     initiate or encourage the submission of any Enterra Takeover Proposal (as
     hereinafter defined), (ii) enter into any agreement with respect to any
     Enterra Takeover Proposal, or (iii) participate in any discussions or
     negotiations regarding, or furnish to any



                                      -43-

<PAGE>

     person any information with respect to, the making of any proposal that
     constitutes, or may reasonably be expected to lead to, any Enterra Takeover
     Proposal; PROVIDED, HOWEVER, that prior to the vote of stockholders of
     Enterra for approval and adoption of this Agreement and the Merger, Enterra
     may take any actions described in the foregoing clause (iii) to the extent
     that the Board of Directors of Enterra determines, in good faith after
     consultation with outside counsel, that failure to take such actions could
     reasonably be expected to result in a breach of the Board's fiduciary
     obligations.  Without limiting the foregoing, it is understood that any
     violation of the restrictions set forth in the preceding sentence by any
     officer, director or employee of Enterra or any of the Enterra Subsidiaries
     or any investment banker, attorney or other advisor, agent or
     representative of Enterra, whether or not such person is purporting to act
     on behalf of Enterra or otherwise, shall be deemed to be a material breach
     of this Agreement by Enterra.  For purposes of this Agreement, an "Enterra
     Takeover Proposal" means (i) any proposal or offer, other than a proposal
     or offer by Weatherford or any of its affiliates, for a merger or other
     business combination involving Enterra, (ii) any proposal or offer, other
     than a proposal or offer by Weatherford or any of its affiliates, to
     acquire from Enterra or any of its affiliates in any manner, directly or
     indirectly, more than 30% of the voting stock of Enterra or any Enterra
     Subsidiary or a material amount of the assets of Enterra and the Enterra
     Subsidiaries, taken as a whole, or (iii) any proposal or offer, other than
     a proposal or offer by Weatherford or any of its affiliates, to acquire
     from the stockholders of Enterra by tender offer, exchange offer or
     otherwise more than 30% of the outstanding voting stock of Enterra.

          (b)  Neither the Board of Directors of Enterra nor any committee
     thereof shall (i) withdraw or modify, or propose to withdraw or modify, in
     a manner adverse to Weatherford the approval or recommendation by the Board
     of Directors of Enterra or any such committee of this Agreement or the
     Merger or take any action having such effect or (ii) approve or recommend,
     or propose to approve or recommend, any Enterra Takeover Proposal.
     Notwithstanding the foregoing, if the Board of Directors of Enterra
     receives an Enterra Takeover Proposal that, in the exercise of its
     fiduciary obligations (as determined in good faith after consultation with
     outside counsel), it determines to be an Enterra Superior Proposal (as
     hereinafter defined), the Board of Directors of Enterra may withdraw or
     modify its approval or recommendation of this Agreement or the Merger and
     may (subject to the following sentence) terminate this Agreement, in each
     case at any time after the fifth business day following Weatherford's
     receipt of written notice (an "Enterra Notice of Superior Proposal")
     advising Weatherford that the Board of Directors of Enterra has received an
     Enterra Takeover Proposal that it has determined to be an Enterra Superior
     Proposal, specifying the principal terms and conditions of such Enterra
     Superior Proposal and identifying the person making such Enterra Superior
     Proposal.  Enterra may terminate this Agreement pursuant to the preceding
     sentence only if the stockholders of Enterra shall not yet have voted upon
     the Merger and Enterra shall have paid to Weatherford the Termination Fee.
     Nothing contained herein shall prohibit Enterra from taking and disclosing
     to its stockholders a position contemplated by Rule 14e-2(a) of the
     Exchange Act


                                      -44-

<PAGE>

     provided that Enterra does not withdraw or modify its position with respect
     to the Merger or take any action having such effect or approve or recommend
     an Enterra Takeover Proposal.  For purposes of this Agreement, an "Enterra
     Superior Proposal" means any bona fide Enterra Takeover Proposal to merge
     with or acquire, directly or indirectly, all of the voting stock then
     outstanding or all or substantially all of the assets of Enterra, and
     otherwise on terms that the Board of Directors of Enterra determines in its
     good faith reasonable judgment (based on the written advice of a financial
     advisor of nationally recognized reputation) to be more favorable to
     Enterra's stockholders than the Merger.

          (c)  If the Board of Directors of Enterra or any committee thereof
     shall (i) withdraw or modify, or propose to withdraw or modify, in a manner
     adverse to Weatherford the approval or recommendation by the Board of
     Directors of Enterra or any such committee of this Agreement or the Merger
     or take any action having such effect or (ii) approve or recommend, or
     propose to approve or recommend, any Enterra Takeover Proposal, Weatherford
     may terminate this Agreement.

          (d)  In addition to the obligations of Enterra set forth in
     Section 7.2(b), Enterra shall promptly advise Weatherford orally and in
     writing of any negotiations or discussions, entered into in reliance on the
     proviso to the first sentence of Section 7.2(a).

     7.3  FEE AND EXPENSE REIMBURSEMENTS.

          (a)  Weatherford agrees to pay Enterra a fee in immediately available
     funds of $20,000,000 (the "Termination Fee") promptly upon the termination
     of this Agreement if this Agreement is terminated by Enterra or Weatherford
     pursuant to  Section 8.1(j).  Further, Weatherford agrees to pay Enterra
     the Termination Fee if:

               (i)    this Agreement is terminated for any reason other than a
          material breach by Enterra and, after the date hereof and before such
          termination, a Weatherford Takeover Proposal shall have been made and
          the stockholders of Weatherford shall not have approved the Merger; or

               (ii)   Weatherford shall have terminated this Agreement pursuant
          to Section 8.1(c) or Section 8.1(h) and, within six months after such
          termination, Weatherford shall have entered into a definitive
          agreement with any person (other than Enterra or any of its
          affiliates) with respect to a Weatherford Takeover Proposal than is
          more favorable to Weatherford's stockholders that the Merger.

     The Termination Fee shall be payable promptly upon termination of this
     Agreement if any of the events described in Section 7.3(a)(i) shall have
     occurred prior to termination.  The Termination Fee payable pursuant to
     Section 7.3(a)(ii) shall be payable promptly upon the first occurrence of
     the event following termination of this Agreement.


                                      -45-

<PAGE>

          (b)  Enterra agrees to pay Weatherford the Termination Fee promptly
     upon the termination of this Agreement if this Agreement is terminated by
     Enterra or Weatherford pursuant to Section 8.1(k).  Further, Enterra agrees
     to pay Weatherford the Termination Fee if:

               (i)    this Agreement is terminated for any reason other than a
          material breach by Weatherford and, after the date hereof and before
          such termination, an Enterra Takeover Proposal shall have been made
          and the stockholders of Enterra shall not have approved the Merger; or

               (ii)   Enterra shall have terminated this Agreement pursuant to
          Section 8.1(d) or Section 8.1(i) and, within six months after such
          termination, Enterra shall have entered into a definitive agreement
          with any person (other than Weatherford or any of its affiliates) with
          respect to an Enterra Takeover Proposal that is more favorable to
          Enterra's stockholders than the Merger.

     The Termination Fee shall be payable promptly upon termination of this
     Agreement if any of the events described in Section 7.3(b)(i) shall have
     occurred prior to termination.  The Termination Fee payable pursuant to
     Section 7.3(b)(ii) shall be payable promptly upon the first occurrence of
     the event following termination of this Agreement.

                                  ARTICLE VIII
                                  MISCELLANEOUS

     8.1  TERMINATION.  This Agreement may be terminated and the Merger and the
other transactions contemplated herein may be abandoned at any time prior to the
Effective Time, whether prior to or after approval by the stockholders of
Weatherford or the stockholders of Enterra:

          (a)  by mutual consent of Weatherford and Enterra;

          (b)  by either Weatherford or Enterra if the Merger has not been
     effected on or before December 31, 1995;

          (c)  by Weatherford if the condition set forth in Section 6.2(g) is
     not satisfied;

          (d)  by Enterra if the condition set forth in Section 6.3(g) is not
     satisfied;

          (e)  by Weatherford if a final, unappealable order shall have been
     entered to restrain, enjoin or otherwise prevent, or awarding substantial
     damages in connection with, a consummation of this Agreement or the
     transactions contemplated in connection herewith, or there is pending by
     any governmental body any suit challenging or seeking to restrain or
     prohibit the consummation of the Merger or any of the other transactions
     contemplated by


                                      -46-

<PAGE>

     this Agreement or seeking to obtain from Enterra or any of the Enterra
     Subsidiaries any damages that are material in relation to Enterra and the
     Enterra Subsidiaries, taken as a whole;

          (f)  by Enterra if a final, unappealable order shall have been entered
     to restrain, enjoin or otherwise prevent, or awarding substantial damages
     in connection with, a consummation of this Agreement or the transactions
     contemplated in connection herewith, or there is pending by any
     governmental body any suit challenging or seeking to restrain or prohibit
     the consummation of the Merger or any of the other transactions
     contemplated by this Agreement or seeking to obtain from Weatherford or any
     of the Weatherford Subsidiaries any damages that are material in relation
     to Weatherford and the Weatherford Subsidiaries, taken as a whole;

          (g)  by either Weatherford or Enterra if the required approval of the
     stockholders of Enterra or the stockholders of Weatherford for the adoption
     and approval of the Merger and this Agreement is not received at their
     respective stockholders' meetings;

          (h)  by Weatherford if (i) since the date of this Agreement there has
     been a Material Adverse Change in Enterra or (ii) there has been a breach
     of any representation or warranty set forth in subsection (b), (c), (e) or
     (g) of Section 2.3, or there has been a breach of any other subsection of
     Section 2.3 in any material respect (except to the extent qualified by
     materiality, in which case such representations and warranties shall not
     have been breached in any respect), by Enterra or Enterra fails to perform
     in any material respect any of its covenants, agreements or obligations
     under this Agreement;


          (i)  by Enterra if (i) since the date of this Agreement there has been
     a Material Adverse Change in Weatherford or (ii) there has been a breach of
     any representation or warranty set forth in subsection (b), (c), (e) or (g)
     of Section 2.2, or there has been a breach of any other subsection of
     Section 2.2 in any material respect (except to the extent qualified by
     materiality, in which case such representations and warranties shall not
     have been breached in any respect), by Weatherford or Weatherford fails to
     perform in any material respect any of its covenants, agreements or
     obligations under this Agreement;

          (j)  by Weatherford or Enterra to the extent permitted under
     Section 7.1; or

          (k)  by Weatherford or Enterra to the extent permitted under
     Section 7.2.

     8.2  EFFECT OF TERMINATION.  In the event of any termination of this
Agreement pursuant to Section 8.1, Weatherford and Enterra shall have no
obligation or liability to each other except that (i) the provisions of
Sections 5.8 and 7.3, this Article VIII and the obligations set forth in the
Confidentiality Agreement dated May 12, 1995, between Weatherford and Enterra
(the "Confidentiality Agreement") shall survive any such


                                      -47-

<PAGE>

termination, and (ii) in the case of termination pursuant to Section 8.1(h) or
8.1(i) only, nothing herein and no termination pursuant to such sections will
relieve any party from liability for any breach of this Agreement.

     8.3  WAIVER AND AMENDMENT.  Any provision of this Agreement may be waived
at any time by the party that is, or whose stockholders are, entitled to the
benefits thereof.  This Agreement may not be amended or supplemented at any
time, except by an instrument in writing signed on behalf of each party hereto;
PROVIDED that after this Agreement has been approved and adopted by the
stockholders of Weatherford and the stockholders of Enterra, this Agreement may
be amended only as may be permitted by applicable provisions of the DGCL.  The
waiver by any party hereto of any condition or of a breach of another provision
of this Agreement shall not operate or be construed as a waiver of any other
condition or subsequent breach.  The waiver by any party hereto of any of the
conditions precedent to its obligations under this Agreement shall not preclude
it from seeking redress for breach of this Agreement other than with respect to
the condition so waived.

     8.4  NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
AGREEMENTS.  None of the  representations, warranties, covenants or agreements
in this Agreement or in any instrument delivered pursuant to this Agreement
shall survive the Effective Time, except for the terms of Article I,
Sections 5.4, 5.7, 5.8, 5.9, 5.10, 5.12, 5.13, 5.18, 5.19(b) and 5.22, this
Article VIII and the agreements of the "affiliates" of Enterra and Weatherford
delivered pursuant to Section 6.2(d) and Section 6.3(d), respectively.

     8.5  PUBLIC STATEMENTS.  Enterra and Weatherford agree to consult with each
other prior to issuing any press release or otherwise making any public
statement with respect to the transactions contemplated hereby, and shall not
issue any such press release or make any such public statement prior to such
consultation, except as may be required by law or applicable stock exchange
policy.

     8.6  BINDING EFFECT; ASSIGNMENT.  This Agreement shall inure to the benefit
of and will be binding upon the parties hereto and their respective legal
representatives, successors and permitted assigns.  This Agreement shall not be
assignable by the parties hereto.

     8.7  NOTICES.  All notices, requests, demands, claims and other
communications that are required to be or may be given under this Agreement
shall be in writing and shall be deemed to have been duly given if (a) delivered
in person or by courier, (b) sent by facsimile transmission, answer back
requested, or (c) mailed, certified first class mail, postage prepaid, return
receipt requested, to the parties hereto at the following addresses:


                                      -48-

<PAGE>

     if to Enterra:              Enterra Corporation
                                 13100 Northwest Freeway, Sixth Floor
                                 Houston, Texas 77040
                                 Attention:  D. Dale Wood, Chairman of the
                                    Board, President and Chief Executive
                                    Officer
                                 Fax:  (713) 462-7816

     with a required copy to:    Morgan, Lewis & Bockius
                                 2000 One Logan Square
                                 Philadelphia, Pennsylvania  19103-6993
                                 Attention:  David R. King
                                 Fax:  (215) 963-5299

     if to Weatherford:          Weatherford International Incorporated
                                 1360 Post Oak Boulevard, Suite 1000
                                 Houston, Texas 77056-3098
                                 Attention:  Philip Burguieres, Chairman of
                                    the Board, President and Chief Executive
                                    Officer
                                 Fax:  (713) 439-1152

     with a required copy to:    Fulbright & Jaworski L.L.P.
                                 1301 McKinney, Suite 5100
                                 Houston, Texas 77010-3095
                                 Attention:  Charles L. Strauss
                                 Fax:  (713) 651-5246

or to such other address or facsimile number as any party shall have furnished
to the other by notice given in accordance with this Section 8.7.  Such notices
shall be effective, (i) if delivered in person or by courier, upon actual
receipt by the intended recipient, (ii) if sent by facsimile transmission, when
the answer back is received, or (iii) if mailed, upon the earlier of five days
after deposit in the mail and the date of delivery as shown by the return
receipt therefor.

     8.8  GOVERNING LAW; JURISDICTION.  THIS AGREEMENT, THE SUBJECT MATTER
HEREOF AND ALL OF THE TRANSACTIONS CONTEMPLATED HEREBY SHALL BE GOVERNED IN ALL
RESPECTS, INCLUDING, WITHOUT LIMITATION, VALIDITY, INTERPRETATION AND EFFECT, BY
THE LAWS OF THE STATE OF DELAWARE.  EACH PARTY HERETO IRREVOCABLY SUBMITS TO THE
EXCLUSIVE JURISDICTION OF ANY COURT OF COMPETENT JURISDICTION IN THE STATE OF
DELAWARE AND THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE, AND
ANY OTHER COURT OF THE STATE OF DELAWARE AND THE UNITED STATES WITH JURISDICTION
TO HEAR APPEALS FROM ANY SUCH COURT, FOR THE PURPOSES OF ANY SUIT, ACTION OR
OTHER PROCEEDING OF ANY TYPE WHATSOEVER ARISING OUT OF THIS AGREEMENT OR THE
SUBJECT MATTER HEREOF OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY


                                      -49-

<PAGE>

BROUGHT BY ANY PARTY, AND TO THE EXTENT PERMITTED BY APPLICABLE LAW, HEREBY
WAIVES, AND AGREES NOT TO ASSERT, BY WAY OF MOTION, AS A DEFENSE, OR OTHERWISE,
IN ANY SUCH SUIT, ACTION OR PROCEEDING ANY CLAIM THAT SUCH PARTY IS NOT
PERSONALLY SUBJECT TO THE JURISDICTION OF THE ABOVE-NAMED COURTS, THAT THE SUIT,
ACTION OR PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM, THAT THE VENUE OF THE
SUIT, ACTION OR PROCEEDING IS IMPROPER OR THAT THIS AGREEMENT, OR THE SUBJECT
MATTER HEREOF MAY NOT BE ENFORCED IN OR BY SUCH COURT.  EACH PARTY HERETO
FURTHER AGREES NOT TO BRING OR PURSUE ANY SUCH SUIT, ACTION OF OTHER PROCEEDING
IN ANY OTHER COURTS OR JURISDICTION.

     8.9  SEVERABILITY.  If any term, provision, covenant or restriction of this
Agreement is held by a court of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall continue in full force and effect and shall
in no way be affected, impaired or invalidated.

     8.10 COUNTERPARTS.  This Agreement may be executed in counterparts, each of
which shall be an original, but all of which together shall constitute one and
the same agreement.

     8.11 HEADINGS.  The Section headings herein are for convenience only and
shall not affect the construction hereof.

     8.12 ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES.  This Agreement, the
exhibits attached hereto, the Weatherford Disclosure Letter (and Schedule 2.2(n)
thereto), the Enterra Disclosure Letter (and the exhibits attached thereto) and
the Confidentiality Agreement constitute the entire agreement and supersedes all
other prior agreements and understandings, both oral and written, among the
parties or any of them, with respect to the subject matter hereof and neither
this nor any documents delivered in connection with this Agreement confers upon
any person not a party hereto any rights or remedies hereunder except as
provided in Sections 5.9, 5.12, 5.13, 5.18 and 5.19(b).


                                      -50-

<PAGE>

     IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.

                                 WEATHERFORD INTERNATIONAL INCORPORATED



                                 By:         /s/ Philip Burguieres
                                    -------------------------------------------
                                               Philip Burguieres
                                      Chairman of the Board, President and
                                            Chief Executive Officer


                                 ENTERRA CORPORATION



                                 By:           /s/ D. Dale Wood
                                    -------------------------------------------
                                                 D. Dale Wood
                                       Chairman of the Board, President and
                                            Chief Executive Officer


                                      -51-
<PAGE>
                   APPENDIX B: OPINION OF MERRILL LYNCH & CO.

                                      B-1
<PAGE>
                                                             APPENDIX B


                                                        Investment Banking Group

                                                        One Houston Center
                                                        1221 McKinney
                                                        Suite 2700
                                                        Houston, Texas 77010
                                                        713 759 2500
                                                        FAX 713 759 2580

[Merrill Lynch Logo]



                                        June 23, 1995


Board of Directors
Weatherford International Incorporated
1360 Post Oak Boulevard, Suite 1000
Houston, TX  77056

Attention:  Philip J. Burguieres
            Chairman, President and
            Chief Executive Officer

Gentlemen:

     Weatherford International Incorporated (the "Company") and Enterra
Corporation (the "Subject Company") propose to enter into an agreement (the
"Agreement") pursuant to which the Subject Company will be merged with the
Company in a transaction (the "Merger") in which each share of the Subject
Company's common stock, par value $1.00 per share (the "Shares"), will be
converted into the right to receive 1.69 shares (the "Exchange Ratio") of the
common stock, par value $.10 per share, of the Company (the "Company Shares").
The Merger is expected to be considered by the stockholders of the Subject
Company and the Company at special stockholders' meetings and consummated on or
shortly after the date of such meetings.

     You have asked us whether, in our opinion, the proposed Exchange Ratio is
fair to the holders of the Company Shares from a financial point of view.

     In arriving at the opinion set forth below, we have, among other things:

     (1)    Reviewed the Subject Company's Annual Reports, Forms 10-K and
            related financial information for the three fiscal years ended
            December 31, 1994 and the Subject Company's Form 10-Q and the
            related unaudited financial information for the quarterly period
            ended March 31, 1995;


     (2)    Reviewed the Company's Annual Reports, Forms 10-K and related
            financial information for the three fiscal years ended December 31,
            1994 and the Company's Form 10-Q and the related unaudited financial
            information for the quarterly period ended March 31, 1995;

     (3)    Reviewed certain information, including financial forecasts
            (including consolidation benefits from the Merger), relating to the
            business, earnings, cash flow, assets and prospects of the Subject
            Company and the Company, furnished to us by the Subject Company and
            the Company, respectively;

     (4)    Conducted discussions with members of senior management of the
            Subject Company and the Company concerning their respective
            businesses and prospects;

<PAGE>

[Merrill Lynch Logo]



     (5)    Reviewed the historical market prices and trading activity for the
            Shares and the Company Shares and compared them with each other and
            with that of certain publicly traded companies which we deemed to be
            reasonably similar to the Subject Company and the Company,
            respectively;

     (6)    Compared the results of operations of the Subject Company and the
            Company with each other and with that of certain companies which we
            deemed to be reasonably similar to the Subject Company and the
            Company, respectively;

     (7)    Compared the proposed financial terms of the transactions
            contemplated by the Agreement with the financial terms of certain
            other mergers and acquisitions which we deemed to be relevant;

     (8)    Considered the pro forma effect of the Merger on the Company's
            capitalization ratios and earnings, cash flow and earnings before
            depreciation, interest and taxes ("EBDIT") per share;

     (9)    Reviewed a draft of the Agreement dated June 23, 1995; and

     (10)   Reviewed such other financial studies and analyses and performed
            such other investigations and took into account such other matters
            as we deemed necessary.

     In preparing our opinion, we have relied on the accuracy and completeness
of all information supplied or otherwise made available to us by the Subject
Company and the Company, and we have not independently verified such information
or undertaken an independent appraisal of the assets of the Subject Company or
the Company.  With respect to the financial forecasts furnished by the Subject
Company and the Company (including estimates of consolidation benefits from the
Merger), we have assumed that they have been reasonably prepared and reflect the
best currently available estimates and judgment of the Subject Company's or the
Company's management as to the expected future financial performance of the
Subject Company or the Company, as the case may be.

     We have, in the past, provided financial advisory and financing services to
the Subject Company and have received fees for the rendering of such services.

     On the basis of, and subject to the foregoing, we are of the opinion that
the proposed Exchange Ratio is fair to the holders of the Company Shares from a
financial point of view.

                                                Very truly yours,

                                                MERRILL LYNCH, PIERCE, FENNER &
                                                     SMITH INCORPORATED



                                                By /s/ Schuyler M. Tilney
                                                  -----------------------------
                                                  Schuyler M. Tilney
                                                  Managing Director
                                                  Investment Banking Group



<PAGE>
          APPENDIX C: OPINION OF SIMMONS & COMPANY INTERNATIONAL, INC.

                                      C-1
<PAGE>
                                                                  APPENDIX C


                               [SIMMONS & COMPANY
                            INTERNATIONAL LETTERHEAD]

- --------------------------------------------------------------------------------


June 23, 1995


Board of Directors
Enterra Corporation
13100 Northwest Freeway
Sixth Floor
Houston, Texas 77040


Members of the Board:

You have requested the opinion of Simmons & Company International ("Simmons") as
investment bankers as to the fairness, from a financial point of view, to the
holders of shares of common stock, par value $1.00 per share (the "Company
Common Stock"), of Enterra Corporation (the "Company") of the consideration to
be received by such stockholders in the proposed merger of the Company with
Weatherford International Incorporated ("Weatherford"), pursuant to the
Agreement and Plan of Merger (the  "Agreement"), to be executed by Weatherford
and the Company (the "Proposed Merger").

As more specifically set forth in the Agreement, in the Proposed Merger each
issued and outstanding share of the Company Common Stock will be converted into
1.69 (the "Conversion Number") shares of common stock, par value $0.10 per
share, of Weatherford (the "Weatherford Common Stock").  Cash will be exchanged
in lieu of fractional shares of the Weatherford Common Stock.

Simmons, as a specialized energy-related investment banking firm, is
continuously engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, private placements of debt and equity,
and the management and underwriting of sales of equity and debt to the public.
Simmons has previously rendered investment banking services to the Company and
Weatherford in connection with a number of transactions for which Simmons
received customary compensation.  In addition, in the ordinary course of
business, Simmons may actively trade the securities of the Company and
Weatherford for its own account and for the accounts of customers and,
accordingly, may at any time hold a long or short position in such securities.

In connection with rendering its opinion, Simmons has reviewed and analyzed,
among other things, the following: (i) a draft of the proposed Agreement and
related disclosure letters furnished to Simmons by the Company; (ii) financial
statements and other information concerning the Company, including the Annual
Reports on Form 10-K of the Company for the years ended December 31, 1992
through 1994 and the Quarterly Report on Form 10-Q of the Company for the
quarter ended March 31, 1995; (iii) certain other internal information,
primarily financial in nature and including financial forecasts, concerning the
business and operations of the Company furnished by the Company for purposes of
Simmons' analysis; (iv) certain publicly available information concerning the

<PAGE>

Board of Directors
Enterra Corporation
June 23, 1995
Page 2



trading of the Company Common Stock; (v) certain publicly available information
concerning Weatherford, including the Annual Reports on Form 10-K of Weatherford
for the years ended December 31, 1992 through 1994 and the Quarterly Report on
Form 10-Q of Weatherford for the quarter ended March 31, 1995; (vi) certain
other internal information, primarily financial in nature and including
financial forecasts, concerning the business and operations of Weatherford
furnished by Weatherford for purposes of Simmons' analysis; (vii) certain
publicly available information concerning the trading of Weatherford Common
Stock; (viii) certain publicly available information with respect to certain
other companies that Simmons believes to be comparable to the Company or
Weatherford and the trading markets for certain of such other companies'
securities; and (ix) certain publicly available information concerning the
nature and terms of certain other transactions considered relevant to the
inquiry.  Simmons has also met with certain officers and employees of the
Company and Weatherford to discuss the foregoing as well as other matters
believed relevant to the inquiry.

In arriving at its opinion, Simmons has assumed and relied upon the accuracy and
completeness of all of the financial and other information provided by the
Company and Weatherford, or publicly available, including, without limitation,
information with respect to asset conditions, tax positions, liability reserves
and insurance coverages, and has not attempted independently to verify any such
information.  With respect to the financial forecasts and other data reviewed by
Simmons, Simmons has assumed, with your consent, that such forecasts and other
data, including without limitation the information provided by the managements
of the Company and Weatherford in respect of projected cost savings and
operating efficiencies resulting from the Proposed Merger, have been reasonably
prepared and reflect the best currently available estimates and judgments of the
respective managements of the Company and Weatherford as to the expected future
financial performance of their respective companies and of the companies
combined in the Proposed Merger.  Simmons has not conducted a physical
inspection of any of the assets, properties or facilities of the Company, nor
has Simmons made or obtained any independent evaluations or appraisals of any of
such assets, properties or facilities.  Simmons has assumed that the merger
would be treated as a "pooling of interests" for accounting purposes and as a
tax-free reorganization for federal income tax purposes.  In addition, although
Simmons has discussed the prospects of the Company and Weatherford with certain
representatives of their respective managements, Simmons has been provided with
only limited financial projections and other similar analyses prepared by the
Company's management with respect to the Company's future performance and by
Weatherford's management with respect to Weatherford's future performance.

In conducting its analysis and arriving at its opinion as expressed herein,
Simmons has considered such financial and other factors as it deemed appropriate
under the circumstances including, among others, the following: (i) the
historical and current financial position and results of operations of the
Company and Weatherford;

<PAGE>

Board of Directors
Enterra Corporation
June 23, 1995
Page 3



(ii) the business prospects of the Company and Weatherford; (iii) the potential
personnel and operating expense reductions that could be achieved in the
Proposed Merger; and (iv) the historical and current market for the Company
Common Stock, for Weatherford Common Stock and for the equity securities of
certain other companies believed to be comparable to the Company or Weatherford.
Simmons has also taken into account its assessment of general economic, market
and financial conditions and its experience in connection with similar
transactions and securities' valuation generally.  Simmons' opinion necessarily
is based upon conditions as they exist and can be evaluated on, and on the
information made available at, the date hereof.

Simmons is acting as financial advisor to the Company in this transaction and
will receive a customary fee for its services.  Simmons was not authorized to
solicit, nor did Simmons solicit from others, indications of interest with
respect to acquiring the Company.  Simmons' opinion does not address the
relative merits of the Proposed Merger as compared to any alternative business
combination transaction that might be available to the Company, including the
acquisition of the  Company by a third party.  Simmons is not expressing any
opinion regarding the value that would be realized upon the sale or liquidation
of the Company.

Based upon and subject to the foregoing, Simmons is of the opinion, as
investment bankers, that the consideration to be received by the holders of the
Company Common Stock in the Proposed Merger is fair from a financial point of
view to such holders.

Sincerely,

SIMMONS & COMPANY INTERNATIONAL

/s/ Ben A. Guill

Ben A. Guill
Managing Director

<PAGE>
                APPENDIX D: FIRST RESERVE STOCKHOLDERS AGREEMENT

                                      D-1
<PAGE>
                                                              APPENDIX D

                                                 (Amended as of August 28, 1995)



                                    AGREEMENT


          This Agreement, dated as of June 23, 1995 (this "Agreement"), among
WEATHERFORD INTERNATIONAL INCORPORATED, a Delaware corporation ("Weatherford"),
and AMERICAN GAS & OIL INVESTORS, LIMITED PARTNERSHIP, a New York limited
partnership, AMGO II, LIMITED PARTNERSHIP, a New York limited partnership, AMGO
III, LIMITED PARTNERSHIP, a New York limited partnership, FIRST RESERVE SECURED
ENERGY ASSETS FUND, LIMITED PARTNERSHIP, a Delaware limited partnership, FIRST
RESERVE FUND V, LIMITED PARTNERSHIP, a Delaware limited partnership, FIRST
RESERVE FUND V-2, LIMITED PARTNERSHIP, a Delaware limited partnership, and
FIRST RESERVE FUND VI, LIMITED PARTNERSHIP, a Delaware limited partnership
(each a "First Reserve Fund" and together the "First Reserve Funds"), and
First Reserve Corporation, a Delaware corporation ("FRC").  (The First Reserve
Funds and FRC, and all other persons or entities now or hereafter directly or
indirectly controlling, controlled by or under common control with any of the
First Reserve Funds or FRC, are referred to collectively as the "FRC Group.")


                                   WITNESSETH:

          WHEREAS, the First Reserve Funds currently own in the aggregate
approximately 11,212,349 shares of common stock, par value $1.00 per share
("Enterra Common Stock"), of Enterra Corporation, a Delaware corporation
("Enterra");

          WHEREAS, the shares of Enterra Common Stock owned by the First Reserve
Funds currently are subject to the terms and conditions of that certain
Agreement dated as of May 2, 1994 among Enterra, the First Reserve Funds and FRC
(the "Enterra Standstill Agreement");

          WHEREAS, pursuant to an agreement and plan of merger (the "Merger
Agreement") dated June 23, 1995 between Enterra and Weatherford, each share of
outstanding Enterra Common Stock shall, at the Effective Time (as defined in the
Merger Agreement), be converted, pursuant to a merger (the "Merger") of Enterra
with and into Weatherford, into 0.845 of a share (which number reflects a one
for two reverse stock split to be effected at the closing) of common stock, par
value $.10 per share, of Weatherford ("Weatherford Common Stock");

          WHEREAS, pursuant to the terms of the Merger, the First Reserve Funds
will own, as of the Effective Time, in the aggregate 9,474,431 shares (which
number reflects a one for two

<PAGE>

reverse stock split to be effected at the closing) of Weatherford Common Stock;

          WHEREAS, Weatherford and the FRC Group are entering into this
Agreement to establish certain arrangements with respect to the relationships
between them after the Effective Time, which arrangements are substantially
similar to the arrangements provided for in the Enterra Standstill Agreement;
and

          WHEREAS, Weatherford and the FRC Group believe that these arrangements
will be in the best interests of Weatherford and all of its shareholders from
and after the Effective Time.

          NOW, THEREFORE, intending to be legally bound as of the Effective
Time, the parties hereto agree as follows:

          Section 1.  CERTAIN DEFINITIONS.  As used in this Agreement, the
following terms shall have the following meanings:

          1.1. "Weatherford Voting Securities" shall mean collectively
Weatherford Common Stock, Weatherford preferred stock, par value $1.00 per
share, if entitled to vote generally for the election of directors or otherwise,
any other class or series of Weatherford securities that is entitled to vote
generally for the election of directors or otherwise, and any other securities,
warrants or options or rights of any nature (whether or not issued by
Weatherford) that are convertible into, exchangeable for, or exercisable for the
purchase of, or otherwise give the holder thereof any rights in respect of
Weatherford Common Stock, Weatherford preferred stock that is entitled to vote
generally for the election of directors or otherwise, or any other class or
series of Weatherford securities that is entitled to vote generally for the
election of directors or otherwise.

          1.2. "Termination Date" shall mean August 12, 2004.

          1.3. The "Combined Voting Power" at any measurement date shall mean
the total number of votes which could have been cast in an election of directors
of Weatherford had a meeting of the stockholders of Weatherford been duly held
based upon a record date as of the measurement date if all Weatherford Voting
Securities then outstanding and entitled to vote at such meeting were present
and voted to the fullest extent possible at such meeting.

          1.4. "13D/G Group" shall mean two or more persons acting together for
the purpose of acquiring, holding, voting or disposing of Weatherford Voting
Securities, which persons would be required under the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and the rules and regulations promulgated


                                       -2-
<PAGE>

thereunder to file a statement on Schedule 13D or 13G with the Securities and
Exchange Commission (the "SEC") as a "person" within the meaning of Section
13(d)(3) of the Exchange Act if such persons beneficially owned sufficient
securities to require such a filing under the Exchange Act.

          1.5. The concept of "beneficial ownership" and the terms "person" and
"group" shall have the meanings defined or adopted from time to time pursuant to
Regulation 13D-G adopted by the SEC under the Exchange Act.

          Section 2.  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD. Weatherford
represents and warrants that:

               (a)  Weatherford is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, with
corporate power to own its properties and to conduct its business as now
conducted.

               (b)  As of June 21, 1995, the authorized capital stock of
Weatherford consists of (i) 80,000,000 shares of Weatherford Common Stock, of
which 54,276,632 shares were validly issued and outstanding, fully paid and
nonassessable and (ii) 1,000,000 shares of preferred stock, par value $1.00 per
share, of which no shares were issued and outstanding.

               (c)  Weatherford has full legal right, power and authority to
enter into this Agreement and perform its obligations hereunder.  This Agreement
has been duly authorized, executed and delivered by Weatherford and constitutes
a legal, valid and binding agreement of Weatherford enforceable against
Weatherford in accordance with the terms hereof.

               (d)  Neither the execution and delivery of this Agreement nor the
performance of its obligations hereunder will conflict with or result in a
breach of or constitute a default under any law, rule, regulation, judgment,
order or decree of any court, arbitrator or governmental agency or
instrumentality or of its corporate charter or bylaws or of any agreement or
instrument to which it is a party or subject or by which its property is bound
or affected.

          Section 3.  REPRESENTATIONS AND WARRANTIES OF THE FRC GROUP.  Each of
the First Reserve Funds and FRC, jointly and severally, represents and warrants
to Weatherford as follows:

               (a)  Each First Reserve Fund is a validly existing partnership
under the laws of the jurisdiction of its organization, FRC is a validly
existing corporation under the laws of the jurisdiction of its incorporation,
and each First Reserve Fund and FRC has the full legal right, power and


                                       -3-
<PAGE>

authority to enter into this Agreement and perform their respective obligations
hereunder.

               (b)  This Agreement has been duly authorized, executed and
delivered by each First Reserve Fund and by FRC, and this Agreement constitutes
the legal, valid and binding agreement of the FRC Group, enforceable against the
members of the FRC Group in accordance with the terms hereof.

               (c)  Neither the execution and delivery of this Agreement nor the
performance of their obligations hereunder will conflict with or result in a
breach of or constitute a default under any law, rule, regulation, judgment,
order or decree of any court, arbitrator or governmental agency or
instrumentality or of any agreement or instrument to which any First Reserve
Fund or FRC is bound or affected, or of the partnership agreements of any of the
First Reserve Funds, or of the charter and bylaws of FRC.

               (d)  As of the date of this Agreement and as of the Effective
Time, (i) each First Reserve Fund owns and will own of record the shares of
Enterra Common Stock set forth opposite its respective name on the signature
page of this Agreement, (ii) there are and will be no beneficial owners of such
shares of Enterra Common Stock other than the First Reserve Funds and FRC, (iii)
such shares of Enterra Common Stock represent and will represent all of the
shares of Enterra Common Stock owned of record or beneficially by the First
Reserve Funds and FRC, and (iv) such shares of Enterra Common Stock are and will
be owned of record and beneficially by the First Reserve Funds and FRC, free and
clear of all pledges, liens, claims, security interests and other charges or
defects in title of any nature whatsoever.  No shares of Weatherford Common
Stock are currently, and as of the Effective Time no shares of Weatherford
Common Stock will be, beneficially owned by any member of the FRC Group, except
for those shares of Weatherford Common Stock issuable in the Merger upon
conversion of such shares of Enterra Common Stock.

          Section 4.  COVENANTS WITH RESPECT TO WEATHERFORD VOTING SECURITIES
AND OTHER MATTERS.  Prior to the Termination Date and subject to the further
provisions hereof:

          4.1. ACQUISITION OF WEATHERFORD VOTING SECURITIES.  No member of the
FRC Group shall, directly or indirectly, acquire, offer to acquire, agree to
acquire, become the beneficial owner of or obtain any rights in respect of any
Weatherford Voting Securities, by purchase or otherwise, or take any action in
furtherance thereof, if the effect of such acquisition, agreement or other
action would be (either immediately or upon consummation of any such
acquisition, agreement or other action, or expiration of any period of time
provided in any such acquisition, agreement or other action) (i) to increase the
aggregate beneficial ownership of Weatherford Voting Securities by the FRC Group
to


                                       -4-
<PAGE>

such number of Weatherford Voting Securities that represents or possesses 20% or
more of the Combined Voting Power of Weatherford Voting Securities, or (ii) to
increase the aggregate beneficial ownership of any class or series of
Weatherford Voting Securities by the FRC Group to greater than 20% of such class
or series. Notwithstanding the foregoing maximum percentage limitation, (A) no
member of the FRC Group shall be obligated to dispose of any Weatherford Voting
Securities beneficially owned in violation of such maximum percentage
limitations if, and solely to the extent that, the aggregate beneficial
ownership of the FRC Group is or will be increased solely as a result of a
recapitalization of Weatherford, a repurchase of any Weatherford Voting
Securities by Weatherford or any of its subsidiaries, or any other action taken
by Weatherford or its affiliates (except the FRC Group), if such
recapitalization, repurchase or other action was approved by a majority of the
directors then in office who were not designated by the FRC Group, and (B) if
any other person or group beneficially owns or acquires beneficial ownership of
Weatherford Voting Securities representing greater than 20% of the Combined
Voting Power, the applicable maximum percentage shall be increased to such
greater percentage.  For purposes of calculating the maximum percentage
limitations, all Weatherford Voting Securities that are the subject of an
agreement, arrangement or understanding pursuant to which the FRC Group or any
member thereof has the right to obtain beneficial ownership of such securities
in the future shall also be deemed to be beneficially owned by the FRC Group or
the applicable member thereof.

          4.2. DISTRIBUTION OF WEATHERFORD VOTING SECURITIES.  Each member of
the FRC Group covenants that it shall not, directly or indirectly, sell,
transfer any beneficial interest in, pledge, hypothecate or otherwise dispose of
any Weatherford Voting Security, except by conversion, exchange or exercise of
such Weatherford Voting Securities pursuant to their terms in a manner not
otherwise in violation of Section 4.1 hereof, in response to certain tender or
exchange offers as permitted by Section 4.6(b) hereof, or pursuant to:

               (i)  a bona fide pledge of or the granting of a security interest
          or any other lien or encumbrance in such Weatherford Voting Securities
          to a lender that is not a member of the FRC Group to secure a bona
          fide loan for money borrowed made to one or more members of the FRC
          Group with full recourse to the borrower or borrowers, the foreclosure
          of such pledge or security interest or any other lien or encumbrance
          that may be placed involuntarily upon any Weatherford Voting
          Securities, or the subsequent sale or other disposition of such
          Weatherford Voting Securities by such lender or its agent;


                                       -5-
<PAGE>

               (ii)  a transfer, assignment, sale or disposition of such
          Weatherford Voting Securities within the FRC Group to a member of the
          FRC Group that has signed this Agreement;

               (iii)  a distribution of Weatherford Voting Securities to any
          partner of a First Reserve Fund; provided that any distributee that is
          a member of the FRC Group has signed this Agreement; and provided,
          further that any arrangements coordinated or initiated by FRC to
          assist limited partners in the sale of Weatherford Voting Securities
          distributed to them must comply with the provisions of this Section
          4.2;

               (iv)  sale in a public offering registered under the Act pursuant
          to the registration rights provided in Section 6 hereof;

               (v)  sales in broker's transactions, effected on the New York
          Stock Exchange or any other securities exchange on which the
          Weatherford Voting Securities are listed or in any other public
          trading market in which the Weatherford Voting Securities are then
          being traded, in compliance with the provisions of Rule 144 under the
          Act, ("Rule 144"), including the volume restrictions set forth in such
          rule (excluding for purposes of this clause (v) sales pursuant to the
          provisions of paragraph (k) of Rule 144, which sales are included
          under (vi) below);

               (vi)   sales pursuant to paragraph (k) of Rule 144;

               (vii)  other negotiated sales of Weatherford Voting Securities;
          or

               (viii)  as provided in Section 4.6(b).

Notwithstanding the previous sentence, (A) in effecting any sale, transfer of
any beneficial interest in or other disposition of Weatherford Voting Securities
pursuant to clause (iv) above, the members of the FRC Group selling,
transferring or disposing such Weatherford Voting Securities shall use their
reasonable best efforts to refrain from selling, transferring or disposing of
such number of Weatherford Voting Securities as represent 3% or more of the
Combined Voting Power to any one person or group, (B) no single sale, transfer
of beneficial interest in or other disposition of any Weatherford Voting
Securities may be made by any member of the FRC Group, and no related group of
such sales, transfers or dispositions shall be made by the FRC Group, pursuant
to clauses (iii), (vi) and (vii) above if such number of Weatherford Voting
Securities as represent 5% or more of the


                                       -6-
<PAGE>

Combined Voting Power are being sold, transferred or disposed of to any one
person or group; and (C) no sale, transfer of any beneficial interest in or
other disposition of Weatherford Voting Securities shall be made pursuant to
clauses (iii), (vi) and (vii) above to any one person or group who, upon
consummation of such sale, transfer or disposition of Weatherford Voting
Securities would, directly or indirectly, have beneficial ownership of or the
right to acquire beneficial ownership of such number of Weatherford Voting
Securities as represent 10% or more of the Combined Voting Power.

          4.3. VOTING TRUSTS.  No member of the FRC Group shall deposit any
Weatherford Voting Securities in a voting trust or subject any Weatherford
Voting Securities to any arrangement or agreement with respect to the voting of
such securities unless all the parties to such voting trust, arrangement or
agreement are members of the FRC Group who have executed this Agreement.

          4.4. PROXY SOLICITATIONS, ETC.  No members of the FRC Group shall
solicit proxies, assist any other person in the solicitation of proxies, become
a "participant" in a "solicitation," or assist any "participant" in a
"solicitation" (as such terms are defined in Rule 14a-1 of Regulation 14A under
the Exchange Act) in opposition to the recommendation of a majority of the
directors of Weatherford then in office who were not designated by the FRC
Group, or recommend or request that any other person take any such actions, or
submit any proposal for the vote of stockholders of Weatherford.

          4.5. STOCK POOLING.  No member of the FRC Group shall join a
partnership, limited partnership, syndicate or other group, or otherwise act in
concert with any other person, for the purpose of acquiring, holding, voting or
disposing of any Weatherford Voting Securities, or otherwise become a member of
a 13D/G Group other than the FRC Group itself.

          4.6. TAKEOVER OFFERS.

               (a)  Each member of the FRC Group covenants and agrees not to (i)
publicly suggest or announce its willingness or desire to engage in a
transaction or group of transactions or have another person engage in a
transaction or group of transactions that would result in a change of control of
Weatherford, (ii) present to Weatherford or to any third party any proposal that
can reasonably be expected to result in a change of control of Weatherford, or
(iii) initiate, induce or attempt to induce or give encouragement to any other
person to initiate any proposal that can reasonably be expected to result in a
change of control of Weatherford.

               (b)  Subject to compliance with Section 4.6(a) above, on and
after the eleventh business day after commencement


                                       -7-
<PAGE>

of a tender or exchange offer made by a person who is not a member of the FRC
Group for outstanding Weatherford Voting Securities (a "Qualifying Offer"), any
member of the FRC Group may tender or exchange any Weatherford Voting Securities
beneficially owned by it pursuant to such Qualifying Offer if the Qualifying
Offer shall have been approved, or not opposed, by the board of directors of
Weatherford.  If a Qualifying Offer is opposed by the board of directors of
Weatherford, then, from and after the eleventh business day after commencement
of such Qualifying Offer, any member of the FRC Group may tender or exchange
shares of Weatherford Voting Securities pursuant to such Qualifying Offer only
if (i) no tender or exchange of, or indication of an intention to tender or
exchange, Weatherford Voting Securities is made by any member of the FRC Group
earlier than 24 hours prior to the expiration of any time after which
Weatherford Voting Securities tendered may be treated less favorably than
Weatherford Voting Securities tendered or exchanged prior thereto, and (ii) a
binding agreement is reached with the bidder or offeror prior to any tender or
exchange specifying that only such number of Weatherford Voting Securities
submitted for tender or exchange shall be accepted by the bidder or offeror as
are equal to (A) the percentage of such Weatherford Voting Securities not
beneficially owned by the FRC Group that have been tendered or exchanged,
multiplied by (B) the total number of such Weatherford Voting Securities
beneficially owned by the member of the FRC Group.

          4.7.  PLEDGE OF COVERED SECURITIES.  Each member of the FRC Group
shall promptly give notice to Weatherford of any margin call, demand for
additional security or collateral, or threat to enforce any pledge or security
interest in or with respect to any Weatherford Voting Security owned of record
or beneficially by it.

          Section 5.  VOTING OF WEATHERFORD VOTING SECURITIES AND OTHER RELATED
MATTERS.

               (a)  Each member of the FRC Group that is a holder of record of
Weatherford Voting Securities shall be present, and each member of the FRC Group
that is a beneficial owner of Weatherford Voting Securities shall cause the
holder of record to be present, in person or by proxy, at all meetings of
stockholders of Weatherford so that all Weatherford Voting Securities owned of
record or beneficially by the FRC Group may be counted for the purpose of
determining the presence of a quorum at such meetings.

               (b)  Upon the Effective Time, the number of directors of
Weatherford shall be established as 10 directors, and two individuals designated
by the FRC Group shall be elected as directors of Weatherford, subject to the
provisions of this Agreement.  The parties hereto agree that the number of
directors


                                       -8-
<PAGE>

of Weatherford may not be increased above 10 without the approval of a (i) a
majority of the directors and (ii) all of the directors designated by the FRC
Group.  From and after the Effective Time, the FRC Group and the directors
designated by the FRC Group shall take no action to reduce the number of
directors of Weatherford below 10 directors.

               (c)  For purposes of this Agreement, directors "designated by the
FRC Group" shall include directors designated by the FRC Group as set forth in
Section 5.22 of the Merger Agreement or designated by certain members of the FRC
Group as anticipated by this Section 5, and any other directors of Weatherford
affiliated or associated with any member of the FRC Group.

               (d)  From and after the Effective Time, as long as the FRC Group
beneficially owns at least 15% of the Combined Voting Power of all Weatherford
Voting Securities, two of (i) First Reserve Secured Energy Assets Fund, Limited
Partnership, (ii) First Reserve Fund V, Limited Partnership, (iii) First Reserve
Fund V-2, Limited Partnership and (iv) First Reserve Fund VI, Limited
Partnership (the "Designating First Reserve Funds") as shall be selected by FRC
shall have the right to designate one director of Weatherford, for a total of
two directors of Weatherford (it being understood that the FRC Group shall not
have more than two designees on the board of directors of Weatherford at any
time); provided, however, that:

               (i)  At any time when the FRC Group beneficially owns less than
          15% but at least 10% of the Combined Voting Power of all Weatherford
          Voting Securities, one of the Designating First Reserve Funds, to be
          selected by FRC, shall lose its right to designate a director of
          Weatherford, and such Designating First Reserve Fund shall cause its
          designee on the board of directors of Weatherford to resign forthwith
          such that only one designee of the FRC Group remains on the board of
          directors of Weatherford; and

               (ii)  At any time when the FRC Group beneficially owns less than
          10% of the Combined Voting Power of all Weatherford Voting Securities,
          none of the FRC Group shall have the right to designate any directors
          of Weatherford, and the Designating First Reserve Fund whose designee
          remains on Weatherford's board of directors shall cause its designee
          to resign forthwith such that no designee of the FRC Group remains on
          the board of directors of Weatherford, it being understood that at any
          time that the FRC Group beneficially owns less than 10% of the
          Combined Voting Power of Weatherford Voting Securities no member of
          the FRC


                                       -9-
<PAGE>

          Group shall seek representation on the board of directors of
          Weatherford.

               (e)  Weatherford shall take all necessary or appropriate action
to (i) assist in the nomination for election as directors of those persons
designated by the Designating First Reserve Funds as are entitled to election to
the board of directors of Weatherford pursuant to the provisions of this Section
5, (ii) have at least one of the designees of the FRC Group serve on each
committee of the board of directors of Weatherford as long as the Designating
First Reserve Funds have designated at least two directors pursuant to the
provisions of this Section 5 and (iii) where two designees of the FRC Group are
serving as directors of Weatherford, have each such designee serve in different
classes of directors.  The Designating First Reserve Funds shall cause their
designees on the board of directors of Weatherford to take all necessary or
appropriate action to assist in the nomination for election as directors of such
other nominees as may be selected by a majority of the directors of Weatherford
then in office who were not designated by the Designating First Reserve Funds,
and the FRC Group shall vote all Weatherford Voting Securities owned of record
by any member of the FRC Group, and shall cause all Weatherford Voting
Securities owned beneficially by any member of the FRC Group to be voted, for
the election of such other nominees as well as for the election of all nominees
of the Designating First Reserve Funds designated by them pursuant to this
Section 5.

               (f)  At any time that one of the Designating First Reserve Funds
does not have a representative serving as a director of Weatherford, an
individual designated by such Designating First Reserve Fund shall have the
right to attend all meetings of the board of directors in a nonvoting observer
capacity, to receive notice of such meetings and to receive the information
provided by Weatherford to its board of directors; provided, however, that
Weatherford may require as a condition precedent to any of such person's rights
under this section that such person agree to hold in confidence and trust and to
act in a fiduciary manner with respect to all information received in connection
with board meetings or otherwise; and, provided further, that Weatherford
reserves the right not to provide information to such person, and to exclude
such person from any meeting or portion thereof, if delivery of such information
or attendance at such meeting would adversely affect the attorney-client
privilege between Weatherford and its counsel.  The observer right provided in
this Section 5(f) may be exercised (i) only if (and then only so long as) the
Designating First Reserve Fund has been advised in writing by counsel to such
fund that exercise of this right is reasonably necessary for such Designating
First Reserve Fund to qualify through its investment in Weatherford as a
"venture capital operating company" as such term is defined in applicable U.S.
Department of Labor


                                      -10-
<PAGE>

regulations.  Notwithstanding the above, the FRC Group agrees to use its
reasonable best efforts to cause the Designating First Reserve Funds to qualify
as a "venture capital operating company" under these regulations without
exercise of its rights under this Section.

               (g)  Except as set forth in Section 5(e) above in respect of the
election of directors of Weatherford, each member of the FRC Group shall vote
all Weatherford Voting Securities owned of record by any member of the FRC
Group, and shall cause all Weatherford Voting Securities owned beneficially by
any member of the FRC Group to be voted, at the sole election of such members of
the FRC Group, either (i) in accordance with the recommendations of a majority
of the board of directors, or (ii) in the same proportions for, against and
abstaining in respect of any matter as the holders of record of Weatherford
Voting Securities other than those beneficially owned by the FRC Group that are
entitled to vote on such matter vote their Weatherford Voting Securities.

          6.  REGISTRATION RIGHTS.  Weatherford covenants and agrees as follows:


          6.1.  DEFINITIONS.  For purposes of this Section 6:

               (a)  The term "register," "registered" and "registration" refer
to a registration effected by preparing and filing a registration statement in
compliance with the Act.

               (b)  The term "Registrable Securities" means (i) the Weatherford
Common Stock issuable to the First Reserve Funds as of the Effective Time in
connection with the Merger, and (ii) any Weatherford Common Stock issued as (or
issuable upon the conversion, exchange or exercise of any warrant, right or
other security which is issued as) a dividend or other distribution with respect
to such Weatherford Common Stock; provided, however, that Weatherford Common
Stock sold, transferred or disposed of in accordance with Section 4.2 of the
Agreement to a person to whom registration rights may not be assigned pursuant
to Section 6.13 of the Agreement shall no longer thereafter be considered
Registrable Securities.

               (c)  The term "Holder" means any member of the FRC Group that (i)
has signed this Agreement and (ii) owns of record Registrable Securities.

               (d)  The term "Form S-3" means such form under the Act as in
effect on the date hereof or any registration form under the Act subsequently
adopted by the SEC which permits inclusion or incorporation of substantially all
the required information regarding Weatherford by reference to other documents
filed by Weatherford with the SEC.


                                      -11-
<PAGE>

          6.2.  REQUEST FOR REGISTRATION.

               (a)  If, at any time commencing three months after the Effective
Time of the Merger, Weatherford shall receive a written request from the Holders
of at least 25% of the Registrable Securities then outstanding that Weatherford
file a registration statement under the Act covering the registration of at
least 25% of the Registrable Securities then outstanding (or a lesser percent if
the anticipated aggregate offering price, net of underwriting discounts and
commissions, would exceed $25,000,000), then Weatherford shall, within 10 days
after the receipt thereof, give written notice of such request to all Holders,
and shall, subject to the limitations of Section 6.2(b), effect as soon as
practicable, and in any event within 45 days after the receipt of such request,
the registration under the Act of all Registrable Securities which the Holders
request to be registered within 15 days after the mailing of such notice by
Weatherford in accordance with Section 10.3.  It is understood that all
calculations in this Agreement in respect of a specified percentage of
Registrable Securities then outstanding are to be  made only in respect of the
total number of such Registrable Securities, as defined in Section 6.1(b) above,
then outstanding, and not in respect of the total number of shares of
Weatherford Common Stock then outstanding.

               (b)  If the Holders initiating the registration request hereunder
("Initiating Holders") intend to distribute the Registrable Securities covered
by their request by means of an underwriting, they shall so advise Weatherford
as a part of their request made pursuant to this Section 6.2 and Weatherford
shall include such information in the written notice referred to in subsection
6.2(a).  In such event, the right of any Holder to include Registrable
Securities in such registration shall be conditioned upon such Holder's
participation in such underwriting and the inclusion of such Holder's
Registrable Securities in the underwriting to the extent provided herein.  All
Holders proposing to distribute Registrable Securities through such underwriting
shall (together with Weatherford as provided in subsection 6.4(e)) enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for such underwriting by Weatherford and reasonably acceptable to a
majority in interest of the Initiating Holders.  Weatherford at its sole
discretion may offer a right to participate in any registration statement filed
pursuant to this Section 6.2 to other stockholders of Weatherford Common Stock,
and may itself participate in any registration statement filed pursuant to this
Section 6.2 hereof.  However, notwithstanding any other provision of this
Section 6.2, if the offering is an underwritten offering and the lead managing
underwriter advises the Initiating Holders in writing that marketing factors
require a limitation of the number of shares of Weatherford Common Stock to be
underwritten, then the total number of shares of Common Stock to be


                                      -12-
<PAGE>

underwritten shall be reduced, with such reduction coming first from selling
stockholders who are not Holders, and then from Weatherford. If further
reduction is required, Weatherford shall so advise all Holders of Registrable
Securities that would have otherwise been underwritten pursuant hereto, and the
number of shares of Registrable Securities that may be included in the
underwriting shall be allocated among all Holders thereof, including the
Initiating Holders, in proportion (as nearly as practicable) to the amount of
Registrable Securities sought to be registered by each Holder.

               (c)  Weatherford is obligated to effect only four such
registrations pursuant to this Section 6.2.

               (d)  Notwithstanding the foregoing, if Weatherford shall furnish
to Holders requesting a registration statement pursuant to this Section 6.2, a
certificate signed by the President of Weatherford stating that in the good
faith judgment of a majority of the directors of Weatherford then in office who
were not designated by the FRC Group, it would be materially detrimental to
Weatherford for such registration statement to be filed, Weatherford shall have
the right to defer such filing for a period of not more than 60 days after
receipt of the request of the Initiating Holders; provided, however, that
Weatherford may not utilize this right more than once in any 12-month period.

          6.3.  PIGGYBACK REGISTRATION.  If (but without any obligation to do
so) Weatherford proposes to register any of its Common Stock under the Act in
connection with the public offering of such Common Stock by Weatherford solely
for cash (other than a registration relating solely to the sale of securities to
participants in a dividend reinvestment plan, stock plan or employee benefit
plan; a registration relating solely to the issuance of securities in connection
with an acquisition; or a registration on any form which does not permit
inclusion of selling stockholders), or Weatherford proposes to register any of
its securities on behalf of a holder exercising demand registration rights
similar to those set forth in Section 6.2 above, Weatherford shall, at such
time, promptly give each Holder written notice of such registration.  Upon the
written request of each Holder given within 15 days after mailing of such notice
by Weatherford in accordance with Section 10.3, Weatherford shall, subject to
the provisions of Section 6.8, cause to be registered under the Act all of the
Registrable Securities that each such Holder has requested to be registered.

          6.4.  OBLIGATIONS OF WEATHERFORD.  Whenever required under this
Section 6 to effect the registration of any Registrable Securities, Weatherford
shall, as expeditiously as reasonably possible:


                                      -13-
<PAGE>

               (a)  Prepare and file with the SEC a registration statement with
respect to such Registrable Securities and use its best efforts to cause such
registration statement to become effective, and, upon the request of the Holders
of a majority of the Registrable Securities registered thereunder, keep such
registration statement effective for up to 90 days.

               (b)  Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Act with respect to the disposition of all securities covered
by such registration statement.

               (c)  Furnish to the Holders such numbers of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Act, and such other documents as they may reasonably request
in order to facilitate the disposition of Registrable Securities owned by them.

               (d)  Use its best efforts to register and qualify the securities
covered by such registration statement under such other securities or Blue Sky
laws of such jurisdictions as shall be reasonably requested by the Holders,
provided that Weatherford shall not be required to qualify to do business or to
file a general consent to service of process in any such states of
jurisdictions.

               (e)  In the event of any underwritten public offering, enter into
and perform its obligations under an underwriting agreement, in usual and
customary form, with the underwriters of such offering.  Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

               (f)  Notify each Holder of Registrable Securities covered by such
registration statement at any time when a prospectus relating thereto is
required to be delivered under the Act of the happening of any event as a result
of which the prospectus included in such registration statement, as then in
effect, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing, and then
use its best efforts to promptly correct such statement or omission.
Notwithstanding the foregoing and anything to the contrary set forth in this
Section, each Holder acknowledges that there may occasionally be times when
Weatherford must suspend the use of the prospectus forming a part of the
registration statement until such time as an amendment to the registration
statement has been filed by Weatherford and declared effective by the SEC, or
until such time as Weatherford has filed an appropriate report with the


                                      -14-
<PAGE>

SEC pursuant to the Exchange Act.  Each Holder hereby covenants that it will not
sell any shares of Common Stock pursuant to said prospectus during the period
commencing at the time at which Weatherford gives the Holder notice of the
suspension of the use of said prospectus and ending at the time Weatherford
gives the Holder notice that it may thereafter effect sales pursuant to said
prospectus.  Weatherford shall only be able to suspend the use of said
prospectus for periods aggregating no more than 30 days in respect of any
registration.

          6.5.  FURNISH INFORMATION.  It shall be a condition precedent to the
obligations of Weatherford to take any action pursuant to this Section 6 with
respect to the Registrable Securities of any selling Holder that such Holder
shall furnish to Weatherford such information regarding itself, the Registrable
Securities held by it, and the intended method of disposition of such securities
as shall be required to effect the registration of such Holder's Registrable
Securities and as may be required from time to time to keep such registration
current.

          6.6.  EXPENSES OF DEMAND REGISTRATION.  All expenses incurred by or on
behalf of Weatherford in connection with registrations, filings or
qualifications pursuant to Section 6.2, including, without limitation, all
registration, filing and qualification fees, printers' and accounting fees, and
fees and disbursements of counsel for Weatherford, shall be borne by
Weatherford; provided, however, that Weatherford shall not be required to pay
for any expenses of any registration proceeding begun pursuant to Section 6.2 if
the registration request is subsequently withdrawn at the request of the Holders
of a majority of the Registrable Securities to be registered (in which case all
participating Holders shall reimburse Weatherford promptly for all such
reasonable expenses), unless the Holders of a majority of the Registrable
Securities agree to forfeit their right to one demand registration pursuant to
Section 6.2.  In no event shall Weatherford be obligated to bear underwriting
discounts and commissions and the fees and expenses of counsel to the selling
Holders.

          6.7.  EXPENSES OF PIGGYBACK REGISTRATION.  Weatherford shall bear and
pay all expenses incurred by or on behalf of Weatherford in connection with any
registration, filing or qualification of Registrable Securities with respect to
the registrations pursuant to Section 6.3 for each Holder, including, without
limitation, all registration, filing, and qualification fees, printing and
accounting fees and fees and disbursements of counsel for Weatherford relating
or allocable thereto, but excluding underwriting discounts and commissions
relating to Registrable Securities and the fees and disbursements of counsel for
the selling Holders.



                                      -15-
<PAGE>

          6.8.  UNDERWRITING REQUIREMENTS.  In connection with any offering
involving an underwriting of shares being issued by Weatherford, Weatherford
shall not be required under Section 6.3 to include any of the Holders'
Registrable Securities in such underwriting unless they accept the terms of the
underwriting as agreed upon between Weatherford and the underwriters selected by
it.  If the total amount of securities, including Registrable Securities,
requested by Holders and other stockholders to be included in such offering
exceeds the amount of securities sold other than by Weatherford that the
underwriters reasonably believe compatible with the success of the offering,
then Weatherford shall be required to include in the offering only that number
of such securities, including Registrable Securities, which the underwriters
believe will not jeopardize the success of the offering.  To achieve any
necessary reduction in the securities to be sold, the securities to be excluded
from the offering shall first be selected (in each case, pro rata among such
class of holders according to the total amount of securities proposed to be
included in the registration statement or in such other proportions as shall
mutually be agreed to by such class of holders) in the following order:  (i)
first, securities being included on behalf of holders other than members of the
FRC Group shall be excluded, except as provided in (iii) below; (ii) next, if
additional securities must be excluded, Registrable Securities included pursuant
to Section 6.3 shall be excluded; (iii) thereafter, if additional securities
must be excluded, securities included on behalf of a holder exercising demand
registration rights similar to those set forth in Section 6.2 shall be excluded,
and (iv) finally, if additional securities must be excluded, securities offered
by Weatherford shall be excluded.

          6.9.  DELAY OF REGISTRATION.  No Holder shall have any right to obtain
or seek an injunction restraining or otherwise delaying any such registration as
the result of any controversy that might arise with respect to the
interpretation or implementation of this Section 6.

          6.10.  INDEMNIFICATION.  In the event any Registrable Securities are
included in a registration statement under this Section 6:

               (a)  To the extent permitted by law, Weatherford will indemnify
and hold harmless each Holder and the affiliates of such Holder, and their
respective directors, officers, general and limited partners, agents and
representatives (and the directors, officers, affiliates and controlling persons
thereof), and each other person, if any, who controls such Holder within the
meaning of the Act or the Exchange Act, against any losses, claims, damages, or
liabilities (joint or several) to which they may become subject under the Act,
the Exchange Act or other federal or state law, insofar as such losses, claims,
damages, or liabilities (or actions in respect thereof) arise out of or are


                                      -16-
<PAGE>

based upon any of the following statements, omissions or violations
(collectively a "Violation"): (i) any untrue statement or alleged untrue
statement of a material fact contained in such registration statement, including
any preliminary prospectus (but only if such is not corrected in the final
prospectus) contained therein or any amendments or supplements thereto, (ii) the
omission or alleged omission to state therein a material fact required to be
stated therein, or necessary to make the statements therein not misleading (but
only if such is not corrected in the final prospectus), or (iii) any violation
or alleged violation by Weatherford in connection with the registration of
Registrable Securities under the Act, the Exchange Act, any state securities law
or any rule or regulation promulgated under the Act, the Exchange Act or any
state securities law; and Weatherford will pay to each such Holder, affiliate or
controlling person, as incurred, any legal or other expenses reasonably incurred
by them in connection with investigating or defending any such loss, claim,
damage, liability, or action; provided, however, that the indemnity agreement
contained in this Section 6.10(a) shall not apply to amounts paid in settlement
of any such loss, claim, damage, liability, or action if such settlement is
effected without the consent of Weatherford (which consent shall not be
unreasonably withheld), nor shall Weatherford be liable in any such case for any
such loss, claim, damage, liability, or action to the extent that it arises out
of or is based upon a violation which occurs in reliance upon and in conformity
with written information furnished expressly for use in connection with such
registration by any such Holder or controlling person.

               (b)  To the extent permitted by law, each selling Holder will
indemnify and hold harmless Weatherford, each of its directors, each of its
officers who has signed the registration statement, each person, if any, who
controls Weatherford within the meaning of the Act, any underwriter, any other
Holder selling securities in such registration statement and any controlling
person of any such underwriter or other Holder, against any losses, claims,
damages, or liabilities (joint or several) to which any of the foregoing persons
may become subject, under the Act, the Exchange Act or other federal or state
law, insofar as such losses, claims, damages, or liabilities (or actions in
respect thereto) arise out of or are based upon any Violation, in each case to
the extent (and only to the extent) that such Violation occurs in reliance upon
and in conformity with written information furnished by such Holder expressly
for use in connection with such registration; and each such Holder will pay, as
incurred, any legal or other expenses reasonably incurred by any person intended
to be indemnified pursuant to this subsection 6.10(b), in connection with
investigating or defending any such loss, claim, damage, liability, or action;
provided, however, that the indemnity agreement contained in this subsection
6.10(b) shall not apply to amounts paid in settlement of any such loss,


                                      -17-
<PAGE>

claim, damage, liability or action if such settlement is effected without the
consent of the Holder, which consent shall not be unreasonably withheld;
provided, that, in no event shall any indemnity under this Section 6.10(b)
exceed the gross proceeds from the offering received by such Holder.

               (c)  Promptly after receipt by an indemnified party under this
Section 6.10 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 6.10, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties.  The failure to deliver written notice to the
indemnifying party within a reasonable time after the commencement of any such
action, if materially prejudicial to its ability to defend such action, shall
relieve such indemnifying party of any liability to the indemnified party under
this Section 6.10, but the omission so to deliver written notice to the
indemnifying party will not relieve it of any liability that it may have to any
indemnified party otherwise than under this Section 6.10.  The indemnified party
shall have the right, but not the obligation, to participate in the defense of
any action referred to above through counsel of its own choosing and shall have
the right, but not the obligation, to assert any and all separate defenses,
cross claims or counterclaims which it may have, and the fees and expenses of
such counsel shall be at the expense of such indemnified party unless (i) the
employment of such counsel has been specifically authorized in advance by the
indemnifying party, (ii) there is a conflict of interest that prevents counsel
for the indemnifying party from adequately representing the interests of the
indemnified party, (iii) the indemnifying party does not employ counsel that is
reasonably satisfactory to the indemnified party, or (iv) the indemnifying party
fails to assume the defense or does not reasonably contest such action in good
faith, in which case, if the indemnified party notifies the indemnifying party
that it elects to employ separate counsel, the indemnifying party shall not have
the right to assume the defense of such action on behalf of the indemnified
party and the reasonable fees and expenses of such separate counsel shall be
borne by the indemnifying party; provided, however, that the indemnifying party
shall not, in connection with any proceeding or related proceedings in the same
jurisdiction, be liable for the reasonable fees and expenses of more than one
separate firm (in addition to any local counsel) for all indemnified parties.

               (d)  The obligations of Weatherford and the Holders under this
Section 6.10 shall survive the completion of


                                      -18-
<PAGE>

any offering of Registrable Securities in a registration statement under this
Section 6.

          6.11.  REPORTS UNDER THE EXCHANGE ACT.  With a view to making
available to the Holders the benefits of Rule 144 and any other rule or
regulation of the SEC that may at any time permit a Holder to sell securities of
Weatherford to the public without registration or pursuant to a registration on
Form S-3, Weatherford agrees to:

               (a)  use its best efforts to make and keep public information
available, as those terms are understood and defined in Rule 144;

               (b)  use its best efforts to file with the SEC in a timely manner
all reports and other documents required under the Act and the Exchange Act; and


               (c)  furnish to any Holder forthwith upon request (i) a written
statement by Weatherford as to its compliance with the reporting requirements of
Rule 144, or as to whether it qualifies as a registrant whose securities may be
resold pursuant to Form S-3, (ii) a copy of the most recent annual or quarterly
report of Weatherford and such other reports and documents so filed by
Weatherford, and (iii) such other information as may be reasonably requested in
availing any Holder of any rule or regulation of the SEC which permits the
selling of any such securities without registration or pursuant to such form.

          6.12.  FORM S-3 REGISTRATION.  In case Weatherford shall receive from
any Holder or Holders of at least 10% of the Registrable Securities then
outstanding (or a lesser percent if the anticipated aggregate offering price,
net of discounts and commissions, would exceed $1,000,000) a written request or
requests that Weatherford effect a registration on Form S-3 not involving an
underwriting and any related qualification or compliance with respect to all or
a part of the Registrable Securities owned by such Holder or Holders,
Weatherford will:

               (a)  promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other Holders; and

               (b)  as soon as practicable, effect such registration and all
such qualifications and compliances as may be so requested and as would permit
or facilitate the sale and distribution of all or such portion of such Holder's
or Holders' Registrable Securities as are specified in such request, together
with all or such portion of the Registrable Securities of any other Holder or
Holders joining in such request as are specified in a written request given
within 15 days after receipt of such written notice from Weatherford; provided,
however, that


                                      -19-
<PAGE>

Weatherford shall not be obligated to effect any such registration,
qualification or compliance, pursuant to this Section 6.12:  (1) if Form S-3 is
not available for such offering by the Holders; (2) if the Holders, together
with the holders of any other securities of Weatherford entitled to include
securities in such registration, propose to sell Registrable Securities and such
other securities (if any) at an aggregate price to the public (net of any
discounts or commissions) of less than $1,000,000; (3) if Weatherford shall
furnish to the Holders a certificate signed by the President of Weatherford
stating that in the good faith judgment of a majority of the directors of
Weatherford then in office who were not designated by the FRC Group, it would be
materially detrimental to Weatherford for such Form S-3 Registration to be
effected at such time, in which event Weatherford shall have the right to defer
the filing of the Form S-3 registration statement for a period of not more than
60 days after receipt of the request of the Holder or Holders under this Section
6.12; provided, however, that Weatherford shall not utilize this right more than
once in any 12-month period; (4) if Weatherford has, within the 12-month period
preceding the date of such request, already effected a registration on Form S-3
for the Holders pursuant to this Section 6.12; or (5) in any particular
jurisdiction in which Weatherford would be required to qualify to do business or
to execute a general consent to service of process in effecting such
registration, qualification or compliance.

               (c)  Subject to the foregoing, Weatherford shall file a
registration statement covering the Registrable Securities and other securities
so requested to be registered as soon as practicable after receipt of the
request or requests of the Holders.  All expenses incurred by or on behalf of
Weatherford in connection with the registrations requested pursuant to Section
6.12, including (without limitation) all registration, filing, qualification,
printer's and accounting fees and the fees and disbursements of counsel for
Weatherford, shall be borne by Weatherford, except that any discounts or
commissions associated with Registrable Securities and the fees and
disbursements of counsel for the selling Holder or Holders shall be borne by the
Holder or Holders participating in the Form S-3 Registration.  Registrations
effected pursuant to this Section 6.12 shall not be counted as demands for
registration or registrations effected pursuant to Sections 6.2.

          6.13.  NO ASSIGNMENT OF REGISTRATION RIGHTS.  The rights to cause
Weatherford to register Registrable Securities pursuant to this Section 6 may
only be assigned by a Holder to a transferee or assignee of any Registrable
Securities if (i) such transferee or assignee is a member of the FRC Group that
has executed this Agreement, and (ii) immediately following such transfer the
further disposition of such securities by the transferee or assignee is
restricted under the Act.


                                      -20-
<PAGE>

          6.14.  LIMITATIONS ON SUBSEQUENT REGISTRATION RIGHTS.  From and after
the date of this Agreement, Weatherford shall not, without the prior written
consent of the Holders of a majority of the outstanding Registrable Securities
(or, prior to the Effective Time of the Merger, without the prior written
consent of FRC), enter into any agreement with any holder or prospective holder
of any securities of Weatherford which would allow such holder or prospective
holder to include such securities in any registration filed under Sections 6.2
or 6.3 hereof, unless under the terms of such agreement, such holder or
prospective holder may include such securities in any such registration only to
the extent that the inclusion of its securities will not reduce the amount of
the Registrable Securities of the Holders which is included.

          6.15.  WAIVER PROCEDURES.  The observance by Weatherford of any
provision of this Section 6 may be waived (either generally or in a particular
instance and either retroactively or prospectively) with the written consent of
the holders of a majority of the Registrable Securities then outstanding, and
any waiver effected in accordance with this paragraph shall be binding upon each
Holder of Registrable Securities.

          6.16.  "MARKET STAND-OFF" AGREEMENT.  Any Holder of Registrable
Securities, if requested by an underwriter of any registered public offering of
Weatherford securities being sold in a firm commitment underwriting, agrees not
to sell or otherwise transfer or dispose of any Common Stock (or other
Weatherford Voting Securities) held by such Holder other than shares of
Registrable Securities included in the registration, during a period of up to 90
days following the effective date of the registration statement, provided that
all other persons selling securities in such underwritten public offering and
all officers and directors of Weatherford shall enter into similar agreements.
Such agreement shall be in writing in the form reasonably satisfactory to
Weatherford and such underwriter.  Weatherford may impose stop-transfer
instructions with respect to the securities subject to the foregoing restriction
until the end of the required stand-off period.

          Section 7.  TERM OF AGREEMENT; CERTAIN PROVISIONS REGARDING
TERMINATION.

               (a)  Except as otherwise provided in (b) below, the respective
covenants and agreements of the FRC Group and Weatherford contained in this
Agreement will continue in full force and effect until the Termination Date, and
all of the representations and warranties set forth herein shall be continuing
representations and warranties.  Upon the Termination Date, all of the
obligations of Weatherford and the FRC Group hereunder shall terminate, except
solely the obligations of the


                                      -21-
<PAGE>

parties pursuant to Section 6.10 in respect of registrations completed prior to
the Termination Date.

               (b)  If the FRC Group shall, at any time, sell or otherwise
dispose of Weatherford Voting Securities in compliance with the terms and
provisions of this Agreement so that the FRC Group beneficially owns in the
aggregate shares representing less than 10% of the Combined Voting Power, all
covenants, agreements, obligations and rights of the FRC Group and Weatherford
contained in Sections 4.2 (except that no single sale, transfer of any
beneficial interest in or other disposition of Weatherford Voting Securities,
and no related group of such sales, transfers or dispositions, shall be made by
the FRC Group if such sales, transfers or dispositions (i) involve such number
of Weatherford Voting Securities as represent 5% or more of the Combined Voting
Power, or (ii) are to or with any one person or related group of persons who,
upon consummation of such sale, transfer or disposition have beneficial
ownership of such number of Weatherford Voting Securities as represent 10% or
more of the Combined Voting Power), 4.3, 4.4, 4.5, 4.7, 5, 6 and 8 hereof shall
cease until such time as the FRC Group shall again purchase or otherwise acquire
beneficial ownership of Weatherford Voting Securities representing 10% or more
of the Combined Voting Power.  From and after such times as the FRC Group
beneficially owns in the aggregate Weatherford Voting Securities representing
10% or more of the Combined Voting Power, all restrictions upon and covenants of
the FRC Group and Weatherford set forth in this Agreement shall again be
applicable until the Termination Date.  All percentages in this Section shall be
calculated in accordance with the provisions of Section 4.1.

          Section 8.  LEGEND AND STOP TRANSFER ORDER.  To assist in effectuating
the provisions of this Agreement, the FRC Group hereby consents (i) to the
placement, in connection with the Merger or otherwise within 10 business days
after any Weatherford Voting Securities become subject to the provisions of this
Agreement, of the following legend on all certificates representing ownership of
Weatherford Voting Securities owned of record by any member of the FRC Group or
by any person where a member of the FRC Group is the beneficial owner thereof,
until such shares are sold, transferred or disposed in a manner permitted hereby
to a person who is not then a member of the FRC Group:

          The shares represented by this certificate are subject to
          the provisions of an Agreement among Weatherford
          Corporation, First Reserve Corporation and certain limited
          partnerships under control of or common control with First
          Reserve Corporation, and may not be sold, transferred,
          pledged, hypothecated or otherwise disposed of except in
          accordance


                                      -22-
<PAGE>

           therewith.  Copies of said Agreement are on file at the office of
           the Corporate Secretary of Weatherford Corporation.

; and (ii) to the entry of stop transfer orders with the transfer agent or
agents of Weatherford Voting Securities against the transfer of Weatherford
Voting Securities except in compliance with the requirements of this Agreement,
or if Weatherford acts as its own transfer agent with respect to any Weatherford
Voting Securities, to the refusal by Weatherford to transfer any such securities
except in compliance with the requirements of this Agreement.  Weatherford
agrees to remove promptly all legends and stop transfer orders with respect to
the transfer of Weatherford Voting Securities being made to a person who is not
then a member of the FRC Group in compliance with the provisions of this
Agreement.

          Section 9.  REMEDIES.

               (a)  The FRC Group acknowledges and agrees that (i) the
provisions of this Agreement are reasonable and necessary to protect the proper
and legitimate interests of the parties hereto, and (ii) Weatherford and the FRC
Group would be irreparably damaged in the event any of the provisions of this
Agreement were not performed by the other parties hereto in accordance with
their specific terms or were otherwise breached.  It is accordingly agreed that
the non-breaching party shall be entitled to preliminary and permanent
injunctive relief to prevent breaches of the provisions of this Agreement,
without the necessity of proving actual damages or of posting any bond, and to
enforce specifically the terms and provisions hereof and thereof in any court of
the United States or any state thereof having jurisdiction, which rights shall
be cumulative and in addition to any other remedy to which such non-breaching
party may be entitled hereunder or at law or equity.

               (b)  In addition to any other remedy Weatherford may have under
this Agreement or in law or equity, if the FRC Group shall acquire or transfer
any Weatherford Voting Securities in violation of this Agreement, such
Weatherford Voting Securities which are in excess of the number permitted to be
owned or controlled by the FRC Group or which have been transferred by the FRC
Group in violation of the provisions of this Agreement may not be voted by the
owner thereof or any proxy therefor.

          10.  GENERAL PROVISIONS.

          10.1.     CONSENT TO JURISDICTION; SERVICE OF PROCESS. THIS AGREEMENT
SHALL BE GOVERNED BY AND INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF DELAWARE WITHOUT GIVING EFFECT TO ANY CONFLICTS OF LAW PROVISIONS.
EACH OF THE


                                      -23-
<PAGE>

PARTIES IRREVOCABLY AND UNCONDITIONALLY (A) AGREES THAT ANY SUIT, ACTION OR
OTHER LEGAL PROCEEDING (COLLECTIVELY, "SUIT") ARISING OUT OF THIS AGREEMENT
SHALL BE BROUGHT AND ADJUDICATED IN THE UNITED STATES DISTRICT COURT FOR
DELAWARE, OR, IF SUCH COURT WILL NOT ACCEPT JURISDICTION, IN ANY COURT OF
COMPETENT CIVIL JURISDICTION SITTING IN NEW CASTLE COUNTY, DELAWARE, (B) SUBMITS
TO THE JURISDICTION OF ANY SUCH COURT FOR THE PURPOSES OF ANY SUCH SUIT AND (C)
WAIVES AND AGREES NOT TO ASSERT BY WAY OF MOTION, AS A DEFENSE OR OTHERWISE IN
ANY SUCH SUIT, ANY CLAIM THAT IT IS NOT SUBJECT TO THE JURISDICTION OF THE ABOVE
COURTS, THAT SUCH SUIT IS BROUGHT IN AN INCONVENIENT FORUM OR THAT THE VENUE OF
SUCH SUIT IS IMPROPER.  EACH OF THE PARTIES ALSO IRREVOCABLY AND UNCONDITIONALLY
CONSENTS TO THE SERVICE OF ANY PROCESS, PLEADINGS, NOTICES OR OTHER PAPERS IN A
MANNER PERMITTED BY THE NOTICE PROVISIONS OF SECTION 10.3 HEREOF.

          10.2.     JOINT AND SEVERAL OBLIGATIONS.  All of the obligations of
the FRC Group hereunder shall be joint and several.  Each member of the FRC
Group that shall become or have the right to become the beneficial owner, within
the meaning and scope of Section 4.1 hereof, of Weatherford Voting Securities
shall, within 10 days of becoming such owner or holder, execute and deliver to
Weatherford a joinder agreement, agreeing to be legally bound by this Agreement
to the same extent as if named as a member of the FRC Group herein.

          10.3.     NOTICES.  All notices, consents, requests, instructions,
approvals and other communications provided for herein and all legal process in
regard hereto shall be in writing and shall be decreed to be validly given, made
or served when delivered personally or deposited in the U.S. mail, postage
prepaid, for delivery by express, registered or certified mail, or delivered to
a recognized overnight courier service, addressed as follows:


          If to Weatherford:

               Weatherford International Incorporated
               1360 Post Oak Boulevard, Suite 1000
               Houston, Texas 77056-3098
               Attn:  Chairman, President and
                      Chief Executive Officer

          With a required copy to:

               Fulbright & Jaworski L.L.P.
               1301 McKinney, Suite 5100
               Houston, Texas  77010-3095
               Attn:  Charles L. Strauss, Esq.


                                      -24-
<PAGE>

          If to any member of the First Reserve Group:

               First Reserve Corporation
               475 Steamboat Road
               Greenwich, Connecticut 06830
               Attn:  President and Chief Executive Officer

          With a required copy to:

               Simpson Thacher & Bartlett
               425 Lexington Avenue
               New York, New York 10017-3909
               Attn:  Robert L. Friedman, Esq.

or to such other address as may be specified on a notice given pursuant to this
Section 10.3.

          10.4.     SEVERABILITY.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid, void, or unenforceable, the remainder of the terms, provisions,
covenants and restrictions shall remain in full force and effect and shall in no
way be affected, impaired or invalidated.  The parties agree that they will use
their best efforts at all times to support and defend this Agreement.

          10.5.     AMENDMENTS.  This Agreement may be amended only by an
agreement in writing signed by each of the parties hereto; provided, however,
that any amendment executed by Weatherford must prior thereto be approved by a
majority of the directors of Weatherford then in office who were not designated
by the FRC Group.

          10.6.     DESCRIPTIVE HEADINGS.  Descriptive headings are for
convenience only and shall not control or affect the meaning or construction of
any provision of this Agreement.

          10.7.     COUNTERPARTS.  This Agreement shall become binding when one
or more counterparts hereof, individually or taken together, bears the
signatures of each of the parties hereto.  This Agreement may be executed in any
number of counterparts, each of which shall be an original as against the party
whose signature appears thereon, or on whose behalf such counterpart is
executed, but all of which taken together shall be one and the same statement.

          10.8.     SUCCESSORS AND ASSIGNS.  This Agreement shall be binding
upon and inure to the benefit of and be enforceable by the successors and
assigns of the parties hereto.


                                      -25-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto intending to be legally bound
have duly executed this Agreement, all as of the day and year first above
written.

                              WEATHERFORD INTERNATIONAL
                                   INCORPORATED


                              By: /s/ Philip Burguieres
                                 ----------------------
                                 Philip Burguieres
                                 Chairman, President and
                                 Chief Executive Officer



                              FIRST RESERVE CORPORATION


                              By: /s/ William E. Macaulay
                                 ------------------------
                                 William E. Macaulay
                                 President and Chief
                                 Executive Officer

NUMBER OF SHARES OF           FIRST RESERVE FUNDS:
ENTERRA COMMON STOCK
HELD ON THE DATE HEREOF:

  1,993,529                   AMERICAN GAS & OIL INVESTORS,
                                LIMITED PARTNERSHIP
  1,233,907                   AMGO II, LIMITED PARTNERSHIP
    597,408                   AMGO III, LIMITED PARTNERSHIP
  2,323,562                   FIRST RESERVE SECURED ENERGY ASSETS
                                FUND, LIMITED PARTNERSHIP
  3,355,254                   FIRST RESERVE FUND V, LIMITED
                                PARTNERSHIP
    838,427                   FIRST RESERVE FUND V-2, LIMITED
                                PARTNERSHIP
    870,262                   FIRST RESERVE FUND VI, LIMITED
                                PARTNERSHIP

                              By:  FIRST RESERVE CORPORATION,
                                   Managing General Partner
                                   of each of the First Reserve
                                   Funds


                                   By: /s/ William E. Macaulay
                                      ------------------------
                                      William E. Macaulay
                                      President and
                                      Chief Executive Officer


                                      -26-
<PAGE>
                                    PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

    Weatherford's  Restated  Certificate of  Incorporation contains  a provision
that eliminates the personal monetary liability of a director to Weatherford and
its stockholders for breach of his fiduciary  duty of care as a director to  the
extent  currently  allowed  under  the  Delaware  General  Corporation  Law (the
"DGCL"). If a director were to breach the duty of care in performing his  duties
as  a director, neither Weatherford nor  its stockholders could recover monetary
damages  from  the  director,  and  the  only  course  of  action  available  to
Weatherford's  stockholders would  be equitable remedies,  such as  an action to
enjoin or rescind  a transaction  involving a breach  of the  fiduciary duty  of
care.  To the extent  certain claims against directors  are limited to equitable
remedies, this provision of Weatherford's Restated Certificate of  Incorporation
may   reduce  the  likelihood  of   derivative  litigation  and  may  discourage
stockholders or  management from  initiating  litigation against  directors  for
breach  of  their duty  of  care. Additionally,  equitable  remedies may  not be
effective in many situations.  If a stockholder's only  remedy is to enjoin  the
completion  of the Board of Directors'  action, this remedy would be ineffective
if the stockholder does not become aware  of a transaction or event until  after
it has been completed. In such a situation, it is possible that the stockholders
and  Weatherford  would  have no  effective  remedy against  the  directors. The
directors do  not have  liability  for monetary  damages for  grossly  negligent
business  decisions (in  violation of their  duty of  care), including decisions
made in connection with attempts to acquire Weatherford. Liability for  monetary
damages  remains for (i) any breach of the duty of loyalty to Weatherford or its
stockholders, (ii)  acts  or  omissions  not in  good  faith  or  which  involve
intentional  misconduct  or a  knowing  violation of  law,  (iii) payment  of an
improper dividend or  improper repurchase of  Weatherford's stock under  Section
174  of the  DGCL or  (iv) any  transaction from  which the  director derived an
improper personal benefit. Weatherford's  Restated Certificate of  Incorporation
further  provides that  in the event  the DGCL  is amended to  allow the further
elimination or limitation of the liability  of directors, then the liability  of
Weatherford's  directors shall be limited to the fullest extent permitted by the
amended DGCL.  The DGCL  permits  a corporation  to indemnify  certain  persons,
including officers and directors, who are (or are threatened to be made) parties
to  any threatened,  pending or  completed action,  suit or  proceeding, whether
civil, criminal, administrative or investigative (other than an action by or  in
the  right of the corporation) by reason of their being officers or directors of
the corporation. The indemnity may include expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by an indemnified officer or director, provided he acted in good faith and in  a
manner  he reasonably believed to be in or not opposed to the corporation's best
interests and,  in  the  case  of  criminal  proceedings,  provided  he  had  no
reasonable  cause  to believe  that  his conduct  was  unlawful. The  By-laws of
Weatherford provide indemnification  to the fullest  extent allowed pursuant  to
the foregoing provisions of the DGCL.

    The  DGCL  further  permits  a  corporation  to  indemnify  certain persons,
including officers and directors, who are (or are threatened to be made) parties
to any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor by reason of their being officers
or directors of the corporation.  The indemnity may include expenses  (including
attorneys'  fees) actually and reasonably incurred by the indemnified officer or
director, provided he acted in good faith and in a manner he reasonably believed
to be in, or not opposed to, the corporation's best interests. However, no  such
person  will be indemnified as to matters for which he is found to be liable for
negligence or  misconduct in  the performance  of his  duty to  the  corporation
unless,  and only to the extent that, indemnification is ordered by a court. The
By-laws of Weatherford  provide indemnification  to the  fullest extent  allowed
pursuant to the foregoing provisions of the DGCL.

    Weatherford  also has entered into an indemnification agreement with each of
its directors and certain of  its officers. Each such indemnification  agreement
provides for indemnification to the fullest extent permitted by the DGCL and for
the advancement of expenses, including attorneys' fees and

                                      II-1
<PAGE>
other  costs,  expenses and  obligations, paid  or  incurred in  connection with
investigating, defending, being a witness  in or participating in (including  on
appeal)  any threatened, pending or completed action, suit or proceeding related
to the fact that such director or officer  was serving for or at the request  of
Weatherford.  To the extent that  the Board of Directors  or the stockholders of
Weatherford may in the future wish to limit or repeal the ability of Weatherford
to indemnify  or advance  expenses to  officers and  directors, such  repeal  or
limitation  may not be effective as to officers and directors who are parties to
an  indemnification  agreement,  since  their  rights  to  full  protection  are
contractually assured by the indemnification agreement.

    Delaware  corporations also  are authorized  to obtain  insurance to protect
officers and directors from  certain liabilities, including liabilities  against
which  the corporation cannot indemnify  its directors and officers. Weatherford
currently has in effect  a directors' and  officers' liability insurance  policy
providing aggregate coverage in the amount of $10,000,000.

    All of the foregoing indemnification provisions include statements that such
provisions  are not to  be deemed exclusive  of any other  right to indemnity to
which a director or officer may be entitled under any bylaw, agreement, vote  of
stockholders or disinterested directors or otherwise.

ITEM 21.  EXHIBITS

    The following exhibits are filed herewith unless otherwise indicated:

<TABLE>
<S>        <C>
  2.1      Agreement  and Plan of Merger  dated as of June 23,  1995, as amended as of
           August 28, 1994, between Weatherford and Enterra Corporation.
  4.1      Restated Certificate of  Incorporation of Weatherford,  as amended  through
           September   24,  1993  (incorporated   by  reference  to   Exhibit  3.1  to
           Weatherford's Form 10-K Annual Report for the year ended December 31,  1993
           (File No. 1-7867)).
  4.2      Bylaws  of Weatherford, as amended through  March 17, 1994 (incorporated by
           reference to Exhibit 3.1 to Weatherford's Current Report on Form 8-K  dated
           April 28, 1994 (File No. 1-7867)).
  4.3      Amended  and Restated Revolving and Term Credit Agreement dated as of April
           15, 1994, among Weatherford  International Incorporated, Weatherford  U.S.,
           Inc.,   Weatherford/Lamb,  Inc.,  Credit  Lyonnais   New  York  Branch,  as
           Administrative  Agent,  Texas  Commerce   Bank  National  Association,   as
           Syndication  and Collateral  Agent, Arab  Banking Corporation  (B.S.C.), as
           Co-Agent, and  the financial  institutions listed  on the  signature  pages
           thereto  (incorporated by reference to Exhibit 4.1 to Weatherford's Current
           Report on Form 8-K dated April 28, 1994 (File No. 1-7867)).
 4.4       Consent and First Amendment to Credit Agreement, effective as of April  15,
           1994, among Weatherford International Incorporated, Weatherford U.S., Inc.,
           Weatherford/Lamb,  Inc., Credit Lyonnais New York Branch, as Administrative
           Agent,  Texas  Commerce  Bank  National  Association,  as  Syndication  and
           Collateral  Agent, Arab Banking Corporation  (B.S.C.), as Co-Agent, and the
           financial institutions listed on the signature pages thereto.
 4.5       Consent and Second  Amendment to  Amended and Restated  Revolving and  Term
           Loan  Agreement dated effective as of  December 31, 1994, among Weatherford
           International Incorporated, Weatherford U.S., Inc., Weatherford/Lamb, Inc.,
           Credit Lyonnais New  York Branch, as  Administrative Agent, Texas  Commerce
           Bank  National  Association,  as  Syndication  and  Collateral  Agent, Arab
           Banking Corporation (B.S.C.), as  Co-Agent, and the financial  institutions
           listed on the signature pages thereto.
  4.6      Agreement  dated as  of June 23,  1995, as  amended as of  August 28, 1995,
           among Weatherford and  American Gas &  Oil Investors, Limited  Partnership,
           AmGO II,
</TABLE>

                                      II-2
<PAGE>
<TABLE>
<S>        <C>
           Limited  Partnership, AmGO III, Limited  Partnership, First Reserve Secured
           Energy Assets  Fund, Limited  Partnership, First  Reserve Fund  V,  Limited
           Partnership, First Reserve Fund V-2, Limited Partnership, and First Reserve
           Fund VI, Limited Partnership (collectively, the "First Reserve Funds"), and
           First Reserve Corporation.
  4.7      Letter  Agreement  dated  June 23,  1995,  among  Weatherford International
           Incorporated,  the  First  Reserve  Funds  and  First  Reserve  Corporation
           (incorporated  by reference to Exhibit 99.2 to Weatherford's Current Report
           on Form 8-K dated July 6, 1995 (File No. 1-7867)).
  5        Opinion of Fulbright & Jaworski L.L.P., regarding legality of securities.
  8        Opinion of Fulbright & Jaworski L.L.P., regarding certain tax matters.
*10.1      Second Amendment to  Change of  Control Agreement  with Philip  Burguieres,
           James  R. Burke,  M.E. Eagles,  Norman W.  Nolen, Suzanne  Thomas, James D.
           Green, Gay S. Mayeux, Jon Nicholson and Weldon W. Walker.
*10.2      First Amendment  to Change  of Control  Agreement with  Philip D.  Gardner,
           Robert A. Seekely and Frederick T. Tilton.
 23.1      Consent of Arthur Andersen LLP.
 23.2      Consent of KPMG Peat Marwick LLP.
 23.3      Consent of Ernst & Young LLP.
 23.4      Consent of Coopers & Lybrand L.L.P.
 23.5      Consent  of Fulbright & Jaworski L.L.P. (contained in Exhibit 5 and Exhibit
           8).
 24        Powers of Attorney (included on page II-5 hereof).
 99.1      Proxy Card for Weatherford International Incorporated.
 99.2      Proxy Card for Enterra Corporation.
<FN>
- ------------------------
*Compensatory plan.
</TABLE>

ITEM 22.  UNDERTAKINGS

    The  undersigned  registrant  hereby   undertakes  that,  for  purposes   of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
registrant's annual report  pursuant to section  13(a) or section  15(d) of  the
Exchange  Act (and, where applicable, each  filing of an employee benefit plan's
annual  report  pursuant  to  section  15(d)  of  the  Exchange  Act)  that   is
incorporated  by reference in the registration statement shall be deemed to be a
new registration statement relating to  the securities offered therein, and  the
offering  of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

    Insofar as indemnification for liabilities arising under the Securities  Act
may  be  permitted  to  directors,  officers  and  controlling  persons  of  the
registrant pursuant to  the foregoing provisions,  or otherwise, the  registrant
has  been advised that in the opinion  of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable. In the event that a claim for  indemnification
against  such liabilities (other than the  payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the  registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled  by controlling  precedent, submit  to a  court of  appropriate
jurisdiction  the question whether such indemnification  by it is against public
policy as expressed  in the Securities  Act and  will be governed  by the  final
adjudication of such issue.

                                      II-3
<PAGE>
    The undersigned registrant hereby undertakes that:

        (1)    Prior  to  any public  reoffering  of  the  securities registered
    hereunder through use of a prospectus  which is a part of this  registration
    statement,  by any person or party who is deemed to be an underwriter within
    the meaning  of Rule  145(c),  the issuer  undertakes that  such  reoffering
    prospectus  will  contain  the  information  called  for  by  the applicable
    registration form with respect to reofferings  by persons who may be  deemed
    underwriters,  in addition to the information  called for by the other Items
    of the applicable form; and

        (2)   Every prospectus  (i)  that is  filed  pursuant to  paragraph  (1)
    immediately  preceding, or  (ii) that purports  to meet  the requirements of
    section 10(a)(3) of the  Securities Act, and is  used in connection with  an
    offering  of securities subject to  Rule 415, will be filed  as a part of an
    amendment to the  registration statement  and will  not be  used until  such
    amendment  is effective, and that, for purposes of determining any liability
    under the Securities Act, each such post-effective amendment shall be deemed
    to be  a  new registration  statement  relating to  the  securities  offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.

    The  undersigned  registrant hereby  undertakes to  respond to  requests for
information that is incorporated  by reference into  the prospectus pursuant  to
Items  4, 10(b), 11, or 13  of this Form, within one  business day of receipt of
such request, and  to send  the incorporated documents  by first  class mail  or
other  equally prompt  means. This  includes information  contained in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.

    The undersigned  registrant  hereby  undertakes  to supply  by  means  of  a
post-effective  amendment  all  information concerning  a  transaction,  and the
company being  acquired  involved therein,  that  was  not the  subject  of  and
included in the registration statement when it became effective.

                                      II-4
<PAGE>
                                   SIGNATURES

    Pursuant  to the requirements of the Securities Act, the registrant has duly
caused  this  registration  statement  to  be  signed  on  its  behalf  by   the
undersigned,  thereunto duly authorized, in the City of Houston, State of Texas,
on August 28, 1995.

                                          WEATHERFORD INTERNATIONAL INCORPORATED

                                          By _______/s/_PHILIP BURGUIERES_______
                                                      Philip Burguieres
                                              CHAIRMAN OF THE BOARD, PRESIDENT
                                                 AND CHIEF EXECUTIVE OFFICER

                               POWER OF ATTORNEY

    KNOW ALL MEN  BY THESE PRESENTS,  that each person  whose signature  appears
below constitutes and appoints Philip Burguieres and H. Suzanne Thomas, and each
of  them, either one of whom may act  without joinder of the other, his true and
lawful attorneys-in-fact  and  agents,  with  full  power  of  substitution  and
resubstitution,  for  him and  in  his name,  place and  stead,  in any  and all
capacities, to sign any or all amendments to this Registration Statement, and to
file the  same, with  all exhibits  thereto and  other documents  in  connection
therewith,  with  the Securities  and  Exchange Commission,  granting  unto said
attorneys-in-fact and agents, and each of  them, full power and authority to  do
and  perform each and every act and thing  requisite and necessary to be done in
and about the premises, as fully to all intents and purposes as he or she  might
or   could  do  in  person,  hereby  ratifying  and  confirming  all  that  said
attorneys-in-fact and agents, and each of them, or the substitute or substitutes
of any or all of them, may lawfully do or cause to be done by virtue hereof.

    Pursuant to  the  requirements  of the  Securities  Act,  this  Registration
Statement  has been signed by the following persons in the capacities and on the
date indicated.

<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
- ------------------------------------------------------  ------------------------------------  -------------------
<C>                                                     <S>                                   <C>
                                                        Chairman of the Board, President and
                 /s/PHILIP BURGUIERES                    Chief Executive Officer (Principal     August 28, 1995
                  Philip Burguieres                      Executive Officer)

                                                        Senior Vice President, Chief
                  /s/NORMAN W. NOLEN                     Financial Officer and Treasurer
                   Norman W. Nolen                       (Principal Financial and Accounting    August 28, 1995
                                                         Officer)

                 /s/THOMAS N. AMONETT
                  Thomas N. Amonett                     Director                                August 28, 1995

                  /s/THOMAS C. BROWN
                   Thomas C. Brown                      Director                                August 28, 1995

                 /s/J. KELLY ELLIOTT
                   J. Kelly Elliott                     Director                                August 28, 1995
</TABLE>

                                      II-5
<PAGE>
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
- ------------------------------------------------------  ------------------------------------  -------------------
                /s/WILLIAM E. GREEHEY
                  William E. Greehey                    Director                                August 28, 1995
<C>                                                     <S>                                   <C>

                  /s/JOHN W. JOHNSON
                   John W. Johnson                      Director                                August 28, 1995

               /s/ROBERT K. MOSES, JR.
                 Robert K. Moses, Jr.                   Director                                August 28, 1995

                 /s/W. RANDOLPH SMITH
                  W. Randolph Smith                     Director                                August 28, 1995
</TABLE>

                                      II-6

<PAGE>

                                                            APPENDIX A

                          AGREEMENT AND PLAN OF MERGER



                                     Between


                     Weatherford International Incorporated

                                       and

                               Enterra Corporation


                                  June 23, 1995

                          (As amended August 28, 1995)

<PAGE>

                                TABLE OF CONTENTS

ARTICLE I
THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.1  THE MERGER . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.2  CLOSING DATE . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
     1.3  CONSUMMATION OF THE MERGER . . . . . . . . . . . . . . . . . . . .   2
     1.4  EFFECTS OF THE MERGER. . . . . . . . . . . . . . . . . . . . . . .   2
     1.5  CERTIFICATE OF INCORPORATION; BYLAWS . . . . . . . . . . . . . . .   2
     1.6  DIRECTORS AND OFFICERS . . . . . . . . . . . . . . . . . . . . . .   2
     1.7  CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES. . . . . . .   2
     1.8  TAKING OF NECESSARY ACTION; FURTHER ACTION . . . . . . . . . . . .   4

ARTICLE II
REPRESENTATIONS AND WARRANTIES . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1  CERTAIN DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD. . . . . . . . . . .   5
          (a)  ORGANIZATION AND COMPLIANCE WITH LAW. . . . . . . . . . . . .   5
          (b)  CAPITALIZATION. . . . . . . . . . . . . . . . . . . . . . . .   6
          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT . . . . . . . . . . .   7
          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
               INSTRUMENTS TO WHICH WEATHERFORD IS A PARTY . . . . . . . . .   7
          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS. . . . . . . . . . .   8
          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
               CERTAIN CHANGES AND EVENTS. . . . . . . . . . . . . . . . . .   9
          (g)  CERTAIN FEES. . . . . . . . . . . . . . . . . . . . . . . . .  10
          (h)  LITIGATION. . . . . . . . . . . . . . . . . . . . . . . . . .  10
          (i)  EMPLOYEE BENEFIT PLANS. . . . . . . . . . . . . . . . . . . .  10
          (j)  TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
          (k)  ENVIRONMENTAL . . . . . . . . . . . . . . . . . . . . . . . .  13
          (l)  NO SEVERANCE PAYMENTS . . . . . . . . . . . . . . . . . . . .  14
          (m)  VOTING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . .  14
          (n)  INSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . .  14
          (o)  TITLE TO PROPERTY . . . . . . . . . . . . . . . . . . . . . .  14
          (p)  WEATHERFORD ACTIONS . . . . . . . . . . . . . . . . . . . . .  14
     2.3  REPRESENTATIONS AND WARRANTIES OF ENTERRA. . . . . . . . . . . . .  14
          (a)  ORGANIZATION AND COMPLIANCE WITH LAW. . . . . . . . . . . . .  14
          (b)  CAPITALIZATION. . . . . . . . . . . . . . . . . . . . . . . .  15
          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT . . . . . . . . . . .  15
          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH
               INSTRUMENTS TO WHICH ENTERRA IS A PARTY . . . . . . . . . . .  16
          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS. . . . . . . . . . .  16
          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF
               CERTAIN CHANGES AND EVENTS. . . . . . . . . . . . . . . . . .  18
          (g)  CERTAIN FEES. . . . . . . . . . . . . . . . . . . . . . . . .  18
          (h)  LITIGATION. . . . . . . . . . . . . . . . . . . . . . . . . .  18
          (i)  EMPLOYEE BENEFIT PLANS. . . . . . . . . . . . . . . . . . . .  19
          (j)  TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21


                                       -i-

<PAGE>

          (k)  ENVIRONMENTAL . . . . . . . . . . . . . . . . . . . . . . . .  21
          (l)  NO SEVERANCE PAYMENTS . . . . . . . . . . . . . . . . . . . .  22
          (m)  VOTING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . .  22
          (n)  INSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . .  22
          (o)  TITLE TO PROPERTY . . . . . . . . . . . . . . . . . . . . . .  22
          (p)  ENTERRA ACTIONS . . . . . . . . . . . . . . . . . . . . . . .  22

ARTICLE III
COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME . . . . . . . . . . . .  23
     3.1  CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER. . . . . . .  23
     3.2  ACCESS TO INFORMATION. . . . . . . . . . . . . . . . . . . . . . .  25
     3.3  AFFILIATES' AGREEMENTS . . . . . . . . . . . . . . . . . . . . . .  25
     3.4  RESERVATION OF WEATHERFORD COMMON STOCK. . . . . . . . . . . . . .  25
     3.5  STOCK EXCHANGE LISTING . . . . . . . . . . . . . . . . . . . . . .  25

ARTICLE IV
COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME . . . . . . . . . . . . . .  25
     4.1  CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER. . . . . . . . .  25
     4.2  ACCESS TO INFORMATION. . . . . . . . . . . . . . . . . . . . . . .  27
     4.3  AFFILIATES' AGREEMENTS . . . . . . . . . . . . . . . . . . . . . .  27

ARTICLE V
ADDITIONAL AGREEMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
     5.1  JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT . . . . .  28
     5.2  COMFORT LETTERS. . . . . . . . . . . . . . . . . . . . . . . . . .  28
     5.3  MEETINGS OF STOCKHOLDERS . . . . . . . . . . . . . . . . . . . . .  28
     5.4  REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS. . . . . . . .  29
     5.5  ANTITRUST MATTERS. . . . . . . . . . . . . . . . . . . . . . . . .  30
     5.6  NOTIFICATION OF CERTAIN MATTERS. . . . . . . . . . . . . . . . . .  30
     5.7  AGREEMENT TO DEFEND. . . . . . . . . . . . . . . . . . . . . . . .  30
     5.8  EXPENSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
     5.9  INDEMNIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . .  31
     5.10 POST-EFFECTIVE TIME MAILING. . . . . . . . . . . . . . . . . . . .  32
     5.11 STOCKHOLDERS' AGREEMENT. . . . . . . . . . . . . . . . . . . . . .  32
     5.12 ENTERRA STOCK OPTIONS. . . . . . . . . . . . . . . . . . . . . . .  32
     5.13 ENTERRA EMPLOYEE BENEFITS. . . . . . . . . . . . . . . . . . . . .  33
     5.14 UPDATE OF DISCLOSURE LETTERS . . . . . . . . . . . . . . . . . . .  34
     5.15 WEATHERFORD SPECIAL SEVERANCE PAY PLAN . . . . . . . . . . . . . .  34
     5.16 CHANGE OF CONTROL AGREEMENTS . . . . . . . . . . . . . . . . . . .  34
     5.17 INDEMNIFICATION AGREEMENTS . . . . . . . . . . . . . . . . . . . .  34
     5.18 ENTERRA EMPLOYEE BONUSES.. . . . . . . . . . . . . . . . . . . . .  35
     5.19 ENTERRA SEVERANCE AGREEMENTS.. . . . . . . . . . . . . . . . . . .  35
     5.20 ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER. . . . . .  36
     5.21 WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER. . . .  36
     5.22 BOARD OF DIRECTORS . . . . . . . . . . . . . . . . . . . . . . . .  36


                                      -ii-

<PAGE>

ARTICLE VI
CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
     6.1  CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER . . .  37
     6.2  ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD. . . . . . . .  38
     6.3  ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA. . . . . . . . . .  40

ARTICLE VII
SPECIAL PROVISIONS AS TO CERTAIN MATTERS . . . . . . . . . . . . . . . . . .  42
     7.1  NO SOLICITATION BY WEATHERFORD . . . . . . . . . . . . . . . . . .  42
     7.2  NO SOLICITATION BY ENTERRA . . . . . . . . . . . . . . . . . . . .  43
     7.3  FEE AND EXPENSE REIMBURSEMENTS . . . . . . . . . . . . . . . . . .  45

ARTICLE VIII
MISCELLANEOUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
     8.1  TERMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
     8.2  EFFECT OF TERMINATION. . . . . . . . . . . . . . . . . . . . . . .  47
     8.3  WAIVER AND AMENDMENT . . . . . . . . . . . . . . . . . . . . . . .  48
     8.4  NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
          AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.5  PUBLIC STATEMENTS. . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.6  BINDING EFFECT; ASSIGNMENT . . . . . . . . . . . . . . . . . . . .  48
     8.7  NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
     8.8  GOVERNING LAW; JURISDICTION. . . . . . . . . . . . . . . . . . . .  49
     8.9  SEVERABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.10 COUNTERPARTS . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.11 HEADINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     8.12 ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES. . . . . . . . . . . .  50


                                      -iii-

<PAGE>

                          AGREEMENT AND PLAN OF MERGER

     This Agreement and Plan of Merger, dated as of the 23rd day of June, 1995
(the "Agreement"), is between Weatherford International Incorporated, a Delaware
corporation ("Weatherford"), and Enterra Corporation, a Delaware corporation
("Enterra").

     WHEREAS, subject to and in accordance with the terms and conditions of this
Agreement, the respective Boards of Directors of Weatherford and Enterra have
approved the merger of Enterra with and into Weatherford (the "Merger"), whereby
each issued and outstanding share of common stock, par value $1.00 per share, of
Enterra ("Enterra Common Stock") not owned directly or indirectly by Enterra or
Weatherford will be converted into the right to receive common stock, par value
$.10 per share, of Weatherford ("Weatherford Common Stock"), as provided herein;

     WHEREAS, for federal income tax purposes, it is intended that the Merger
shall qualify as a reorganization within the meaning of Section 368(a) of the
Internal Revenue Code of 1986, as amended (the "Code");

     WHEREAS, the Merger is intended to be treated as a "pooling of interests"
for accounting purposes; and

     WHEREAS, the parties hereto desire to set forth certain representations,
warranties and covenants made by each to the other as an inducement to the
consummation of the Merger;

     NOW, THEREFORE, in consideration of the premises and of the mutual
representations, warranties and covenants herein contained, the parties hereto
hereby agree as follows:

                                    ARTICLE I
                                   THE MERGER

     1.1  THE MERGER.  Subject to and in accordance with the terms and
conditions of this Agreement and in accordance with the Delaware General
Corporation Law (the "DGCL"), at the Effective Time (as defined in Section 1.3)
Enterra will be merged with and into Weatherford.  As a result of the Merger,
the separate corporate existence of Enterra shall cease and Weatherford shall
continue as the surviving corporation (sometimes referred to herein as the
"Surviving Corporation") and shall succeed to and assume all of the rights and
obligations of Enterra in accordance with the DGCL.  The corporate name of the
Surviving Corporation shall be "Weatherford Enterra, Inc.".

     1.2  CLOSING DATE.  The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Fulbright &
Jaworski L.L.P., 1301 McKinney, Suite 5100, Houston, Texas as soon as
practicable after the satisfaction or waiver of the conditions set forth in
Article VI or at such other time and place and on such other date as Weatherford
and Enterra shall agree; PROVIDED, that the closing


                                       -1-

<PAGE>

conditions set forth in Article VI shall have been satisfied or waived at or
prior to such time.  The date on which the Closing occurs is herein referred to
as the "Closing Date".

     1.3  CONSUMMATION OF THE MERGER.  As soon as practicable on the Closing
Date, the parties hereto will cause the Merger to be consummated by filing with
the Secretary of State of the State of Delaware a certificate of merger in such
form as required by, and executed in accordance with, the relevant provisions of
the DGCL.  The "Effective Time" of the Merger as that term is used in this
Agreement shall mean the effective time set forth in the certified copy of the
certificate of merger issued by the Secretary of State of the State of Delaware
with respect to the Merger.

     1.4  EFFECTS OF THE MERGER.  The Merger shall have the effects set forth in
the applicable provisions of the DGCL.

     1.5  CERTIFICATE OF INCORPORATION; BYLAWS.  The Restated Certificate of
Incorporation and bylaws of Weatherford, as in effect immediately prior to the
Effective Time, shall be the Certificate of Incorporation and bylaws of the
Surviving Corporation and thereafter shall continue to be its Certificate of
Incorporation and bylaws until amended as provided therein and under the DGCL.

     1.6  DIRECTORS AND OFFICERS.

          (a)  The Board of Directors of the Surviving Corporation shall consist
     of ten persons.  Exhibit 1.6(a) sets forth the initial directors of the
     Surviving Corporation, along with the term of office for, and the committee
     or committees of the Board of Directors, if any, on, which each such
     director shall serve.

          (b)  Exhibit 1.6(b) sets forth the initial officers of the Surviving
     Corporation, each of whom shall hold office until his or her successor is
     duly elected or appointed and qualified.

     1.7  CONVERSION OF SECURITIES; EXCHANGE; FRACTIONAL SHARES.  Subject to the
terms and conditions of this Agreement, at the Effective Time, by virtue of the
Merger and without any action on the part of Weatherford, Enterra or their
stockholders:

          (a)  Each share of Enterra Common Stock issued and outstanding
     immediately prior to the Effective Time (the "Shares"), other than any
     Shares to be canceled pursuant to Section 1.7(b), shall be converted,
     subject to the provisions of this Section 1.7, into the right to receive
     0.845 of a share (which number reflects a 1 for 2 reverse stock split to be
     effected at the Closing) of Weatherford Common Stock (the "Conversion
     Rate"); PROVIDED, HOWEVER, that no fractional shares of Weatherford Common
     Stock shall be issued, and, in lieu thereof, a cash payment shall be made
     pursuant to Section 1.7(f) hereof.

          (b)  Each share of Enterra Common Stock held in the treasury of
     Enterra and each Share owned by Weatherford or any direct or indirect
     wholly-owned subsidiary of Enterra or of Weatherford immediately prior to
     the


                                       -2-

<PAGE>

     Effective Time shall be canceled and extinguished at the Effective Time
     without any conversion thereof and no payment shall be made with respect
     thereto.

          (c)  As soon as practicable after the Effective Time, each holder of
     an outstanding certificate that prior thereto represented Shares shall be
     entitled, upon surrender thereof to the transfer agent for the Weatherford
     Common Stock, to receive in exchange therefor a certificate or certificates
     representing the number of whole shares of Weatherford Common Stock into
     which the Shares so surrendered shall have been converted as aforesaid, of
     such denominations and registered in such names as such holder may request.
     Each holder of Shares who would otherwise be entitled to a fraction of a
     share of Weatherford Common Stock shall, upon surrender of the certificates
     representing Shares held by such holder to Weatherford's transfer agent, be
     paid an amount in cash in accordance with the provisions of Section 1.7(f).
     Until so surrendered, each outstanding certificate that, prior to the
     Effective Time, represented Shares shall be deemed from and after the
     Effective Time, for all corporate purposes, other than the payment of
     earlier dividends and distributions, to evidence the ownership of the
     number of full shares of Weatherford Common Stock into which such Shares
     shall have been converted pursuant to this Section 1.7.  Unless and until
     any such outstanding certificates shall be surrendered, no dividends or
     other distributions payable to the holders of Weatherford Common Stock, as
     of any time on or after the Effective Time, shall be paid to the holders of
     such outstanding certificates that prior to the Effective Time represented
     Shares; PROVIDED, HOWEVER, that, upon surrender and exchange of such
     outstanding certificates, there shall be paid to the record holders of the
     certificates issued and exchanged therefor the amount, without interest
     thereon, of dividends and other distributions, if any, that theretofore
     were declared and became payable since the Effective Time with respect to
     the number of full shares of Weatherford Common Stock issued to such
     holders.

          (d)  All shares of Weatherford Common Stock into which the Shares
     shall have been converted pursuant to this Section 1.7 shall be issued in
     full satisfaction of all rights pertaining to such converted Shares.

          (e)  If any certificate for shares of Weatherford Common Stock is to
     be issued in a name other than that in which the certificate surrendered in
     exchange therefor is registered, it shall be a condition of the issuance
     thereof that the certificate so surrendered shall be properly endorsed and
     otherwise in proper form for transfer and that the person requesting such
     exchange shall have paid to Weatherford or its transfer agent any transfer
     or other taxes required by reason of the issuance of a certificate for
     shares of Weatherford Common Stock in any name other than that of the
     registered holder of the certificate surrendered, or established to the
     satisfaction of Weatherford or its transfer agent that such tax has been
     paid or is not payable.

          (f)  No fraction of a share of Weatherford Common Stock shall be
     issued, but in lieu thereof each holder of Shares who would otherwise be
     entitled to a fraction of a share of Weatherford Common Stock shall, upon
     surrender of


                                       -3-




<PAGE>

     the Shares held by such holder to Weatherford's transfer agent, be paid an
     amount in cash equal to the value of such fraction of a share based upon
     the closing price of Weatherford Common Stock on the New York Stock
     Exchange on the last trading day prior to the Effective Time.  No interest
     shall be paid on such amount.  All Shares held by a record holder other
     than nominee holders shall be aggregated for purposes of computing the
     number of shares of Weatherford Common Stock to be issued pursuant to this
     Section 1.7.

          (g)  None of Weatherford, Enterra, the Surviving Corporation or
     Weatherford's transfer agent shall be liable to a holder of the Shares for
     any amount properly paid to a public official pursuant to applicable
     property, escheat or similar law.

     1.8  TAKING OF NECESSARY ACTION; FURTHER ACTION.  The parties hereto shall
take all such reasonable and lawful action as may be necessary or appropriate to
effectuate the Merger as promptly as possible.  If, at any time after the
Effective Time, any such further action is necessary or desirable to carry out
the purposes of this Agreement and to vest the Surviving Corporation with full
right, title and possession to all assets, property, rights, privileges, powers
and franchises of Weatherford and Enterra, such corporations shall direct their
respective officers and directors to take all such lawful and necessary action.

                                   ARTICLE II
                         REPRESENTATIONS AND WARRANTIES

     2.1  CERTAIN DEFINITIONS.  As used in this Agreement, the following terms
shall have the meanings ascribed to them below:

          (a)  "Environmental Laws" shall mean all United States or foreign
     federal, state, local or municipal laws, rules, regulations, statutes,
     ordinances or orders of any governmental entity relating to (i) the control
     of any potential pollutant or protection of the air, water or land,
     (ii) solid, gaseous or liquid waste generation, handling, treatment,
     storage, disposal or transportation, and (iii) exposure to hazardous, toxic
     or other substances alleged to be harmful.  The term "Environmental Laws"
     shall include, but not be limited to, the Clean Air Act, 42 U.S.C. Section
     7401 et seq., the Clean Water Act, 33 U.S.C. Section 1251 et seq., the
     Resource Conservation and Recovery Act, 42 U.S.C. Section 6901, et seq.,
     the Toxic Substances Control Act, 15 U.S.C. Section 2601 et seq., the Safe
     Drinking Water Act, 42 U.S.C. Section 300f et seq. and the Comprehensive
     Environmental Response, Compensation and Liability Act ("CERCLA"),
     42 U.S.C. Section 9601 et seq.

          (b)  "Environmental Permit" shall mean any permit, license, approval,
     registration, identification number or other authorization with respect to
     any business or other operations conducted by Weatherford or any
     Weatherford Subsidiary (as defined in Section 2.2(a)) or Enterra or any
     Enterra Subsidiary (as defined in Section 2.3(a)), as the case may be,
     required under any applicable Environmental Law.


                                       -4-

<PAGE>

          (c)  "Hazardous Materials" shall mean any (i) petroleum or petroleum
     products, (ii) hazardous substance as defined pursuant to Section 101(14)
     of CERCLA or (iii) any other chemical, substance or waste that is regulated
     under any Environmental Law.

          (d)  "Material Adverse Change" with respect to any party shall mean a
     material adverse change in the business, financial condition or results of
     operations of such party and its subsidiaries, taken as a whole; PROVIDED,
     HOWEVER, that in no event shall the term "Material Adverse Change" be
     deemed to include (i) changes in national or international economic
     conditions or industry conditions generally, (ii) changes, or possible
     changes, in foreign, federal, state or local statutes and regulations
     applicable to Weatherford or Enterra, as the case may be, or (iii) the loss
     of employees, customers or suppliers by such party as a direct or indirect
     consequence of any announcement relating to the Merger.

          (e)  "Material Adverse Effect" on any party shall mean any material
     adverse effect on the business, financial condition or results of
     operations of such party and its subsidiaries, taken as a whole; PROVIDED,
     HOWEVER, that in no event shall the term "Material Adverse Effect" be
     deemed to include (i) changes in national or international economic
     conditions or industry conditions generally, (ii) changes, or possible
     changes, in foreign, federal, state or local statutes and regulations
     applicable to Weatherford or Enterra, as the case may be, or (iii) the loss
     of employees, customers or suppliers by such party as a direct or indirect
     consequence of any announcement relating to the Merger.

          (f)  "Permitted Liens" shall mean:  (i) liens for taxes not due and
     payable or which are being contested in good faith, (ii) mechanics',
     warehousemen's and other statutory liens incurred in the ordinary course of
     business and (iii) defects and irregularities in title and encumbrances
     that are not substantial in character or amount and do not materially
     impair the use of the property or asset in question.

     2.2  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD.  Weatherford hereby
represents and warrants to Enterra that, except as expressly contemplated by
this Agreement or as set forth in the disclosure letter delivered by Weatherford
to Enterra on the date hereof (the "Weatherford Disclosure Letter"):

          (a)  ORGANIZATION AND COMPLIANCE WITH LAW.  Weatherford and each of
     its corporate subsidiaries (the "Weatherford Subsidiaries") is a
     corporation duly organized, validly existing and in good standing under the
     laws of the jurisdiction in which it is organized and has all requisite
     corporate power and authority and all necessary governmental authorizations
     to own, lease and operate all of its properties and assets and to carry on
     its business as now being conducted, except where the failure to do so
     would not, either individually or in the aggregate, have a Material Adverse
     Effect.  Weatherford and each of the Weatherford Subsidiaries is duly
     qualified as a foreign corporation to do business, and is in good standing,
     in each jurisdiction in which the property



                                       -5-


<PAGE>

     owned, leased or operated by it or the nature of the business conducted by
     it makes such qualification necessary, except in such jurisdictions where
     the failure to do so does not and would not, either individually or in the
     aggregate, have a Material Adverse Effect.  Weatherford and each of the
     Weatherford Subsidiaries is in compliance with all applicable laws,
     judgments, orders, rules and regulations, domestic and foreign, except
     where failure to be in such compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect.  Weatherford has heretofore
     delivered to Enterra true and complete copies of Weatherford's Restated
     Certificate of Incorporation and bylaws, as in existence on the date
     hereof.

          (b)  CAPITALIZATION.

               (i)  The authorized capital stock of Weatherford consists of
          80,000,000 shares of Weatherford Common Stock, par value $.10 per
          share, and 1,000,000 shares of preferred stock, par value $1.00 per
          share.  As of June 21, 1995, there were issued and outstanding
          54,276,632 shares of Weatherford Common Stock (including shares deemed
          to be outstanding pending the exchange of shares of common stock of
          Petroleum Equipment Tools Co. and H&H Oil Tool Co., Inc.) and no
          shares of preferred stock, and 111,043 shares of Weatherford Common
          Stock were held as treasury shares, of which 82,783 shares were
          reserved for issuance pursuant to various stock option agreements.  As
          of June 21, 1995, there were reserved for issuance 2,299,414 shares of
          Weatherford Common Stock pursuant to stock option, employee stock
          purchase, 401(k) savings, stock incentive and restricted stock plans
          (collectively, the "Weatherford Options").  All issued shares of
          Weatherford Common Stock are validly issued, fully paid and
          nonassessable and no holder thereof is entitled to preemptive rights.
          Weatherford is not a party to, and, excluding agreements among various
          funds held or managed by institutional investors, has no knowledge of,
          any voting agreement, voting trust or similar agreement or arrangement
          relating to any class or series of its capital stock, or any agreement
          or arrangement providing for registration rights with respect to any
          capital stock or other securities of Weatherford.  All shares of
          Weatherford Common Stock to be issued pursuant to the Merger, when
          issued in accordance with this Agreement, will be validly issued,
          fully paid and nonassessable and will not violate the preemptive
          rights of any person.  All outstanding shares of capital stock of the
          Weatherford Subsidiaries are owned by Weatherford, free and clear of
          all liens, charges, encumbrances, adverse claims and options of any
          nature; provided, however, that Weatherford's ownership of shares of
          capital stock of certain foreign Weatherford Subsidiaries may be
          subject to Permitted Liens.

               (ii) Other than as set forth in this Section 2.2(b) and as
          contemplated by Section 3.1(b)(iii), there are not now, and at the
          Effective Time there will not be, any (A) shares of capital stock or
          other equity securities of Weatherford outstanding (other than
          Weatherford Common


                                       -6-

<PAGE>

     Stock issued pursuant to Weatherford Options as described herein) or
     (B) outstanding options, warrants, scrip, rights to subscribe for, calls or
     commitments of any character whatsoever relating to, or securities or
     rights convertible into or exchangeable for, shares of any class of capital
     stock of Weatherford, or contracts, understandings or arrangements to which
     Weatherford is a party, or by which it is or may be bound, to issue
     additional shares of its capital stock or options, warrants, scrip or
     rights to subscribe for, or securities or rights convertible into or
     exchangeable for, any additional shares of its capital stock.

          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT.  Weatherford has all
     requisite corporate power and authority to enter into this Agreement and to
     perform its obligations hereunder.  The execution and delivery by
     Weatherford of this Agreement and the consummation by it of the
     transactions contemplated hereby have been duly authorized by all necessary
     corporate action (subject only, with respect to the Merger, to adoption and
     approval of this Agreement by the stockholders of Weatherford as provided
     in Section 5.3(b)).  This Agreement has been duly executed and delivered by
     Weatherford and is the valid and binding obligation of Weatherford,
     enforceable against Weatherford in accordance with its terms, except as
     such enforceability may be limited or affected by (i) bankruptcy,
     insolvency, reorganization, moratorium, liquidation, arrangement,
     fraudulent transfer, fraudulent conveyance and other similar laws
     (including, without limitation, court decisions) now or hereafter in effect
     and affecting the rights and remedies of creditors generally or providing
     for the relief of debtors, (ii) the refusal of a particular court to grant
     equitable remedies, including, without limitation, specific performance and
     injunctive relief, and (iii) general principles of equity (regardless of
     whether such remedies are sought in a proceeding in equity or at law) and
     except as the enforceability of any indemnification provision contained in
     this Agreement may be limited by applicable federal or state securities
     laws.

          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS TO
     WHICH WEATHERFORD IS A PARTY.  Neither the execution and delivery of this
     Agreement nor the performance by Weatherford of its obligations hereunder,
     nor the consummation of the transactions contemplated hereby by
     Weatherford, will (i) conflict with Weatherford's Restated Certificate of
     Incorporation or bylaws; (ii) assuming satisfaction of the requirements set
     forth in clause (iii) below, violate any provision of law applicable to
     Weatherford; (iii) except for (A) requirements of Federal and state
     securities law, (B) requirements arising out of the Hart-Scott-Rodino
     Antitrust Improvements Act of 1976 (the "HSR Act"), (C) requirements of
     filings in such foreign jurisdictions as may be applicable and (D) the
     filing of a certificate of merger in accordance with the DGCL, require any
     consent or approval of, or filing with or notice to, any public body or
     authority, domestic or foreign, under any provision of law applicable to
     Weatherford; or (iv) require any consent, approval or notice under, or
     violate, breach, be in conflict with or constitute a default (or an event
     that, with notice or lapse of time or both, would constitute a default)
     under, or permit the termination of any provision of, or result in the
     creation or imposition of any


                                       -7-

<PAGE>

     lien upon any properties, assets or business of Weatherford under, any
     note, bond, indenture, mortgage, deed of trust, lease, franchise, permit,
     authorization, license, contract, instrument or other agreement or
     commitment or any order, judgment or decree to which Weatherford is a party
     or by which Weatherford or its assets or properties is bound or encumbered,
     except those that have already been given, obtained or filed and except in
     any of the cases enumerated in clauses (ii) through (iv), those that, in
     the aggregate, would not have a Material Adverse Effect.

          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS.  Since January 1, 1992,
     Weatherford and each of the Weatherford Subsidiaries have filed all
     reports, registration statements and other filings, together with any
     amendments required to be made with respect thereto, that they have been
     required to file with the Securities and Exchange Commission (the
     "Commission") under the Securities Act of 1933, as amended (the "Securities
     Act"), and the Securities Exchange Act of 1934, as amended (the "Exchange
     Act").  All reports, registration statements and other filings (including,
     without limitation, all notes, exhibits and schedules thereto and documents
     incorporated by reference therein) filed by Weatherford with the Commission
     since January 1, 1992 through the date of this Agreement, together with any
     amendments thereto, are sometimes collectively referred to as the
     "Weatherford Commission Filings".  Weatherford has heretofore delivered to
     Enterra copies of the Weatherford Commission Filings.  As of the
     effectiveness dates declared by the Commission, in the case of registration
     statements, as of the mailing dates, in the case of proxy statements, or as
     of the filing dates with the Commission, in the case of all other
     Weatherford Commission Filings, the Weatherford Commission Filings
     complied, and the Proxy Statement (as defined in Section 5.1) and the
     Registration Statement (as defined in Section 5.1) (except with respect to
     information concerning Enterra and the Enterra Subsidiaries furnished by or
     on behalf of Enterra to Weatherford specifically for use therein) will
     comply, in all material respects with the Securities Act, the Exchange Act
     and the rules and regulations of the Commission promulgated thereunder, as
     applicable, and did not or will not, as the case may be, contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements made therein, in
     light of the circumstances under which they were made, not misleading.

          All material contracts of Weatherford and the Weatherford Subsidiaries
     have been included in the Weatherford Commission Filings, except for those
     contracts not required to be filed pursuant to the rules and regulations of
     the Commission.

          Each of the audited consolidated financial statements (including,
     without limitation, any related notes or schedules) included or
     incorporated by reference in the Weatherford Commission Filings was, and
     each of the audited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement and the Registration
     Statement (except for those financial statements of Enterra and the Enterra
     Subsidiaries furnished by or on behalf of


                                       -8-

<PAGE>

     Enterra to Weatherford specifically for use therein) will be, prepared in
     accordance with generally accepted accounting principles applied on a
     consistent basis (except as may be noted therein or in the notes or
     schedules thereto), and fairly presents, or will fairly present, as the
     case may be, in all material respects, the consolidated financial position
     of Weatherford and the Weatherford Subsidiaries as of the dates thereof and
     the statements of income, cash flows and stockholders' equity for the
     periods then ended in accordance with generally accepted accounting
     principles.  Each of the unaudited interim financial statements included or
     incorporated by reference in the Weatherford Commission Filings was, and
     each of the unaudited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement and the Registration
     Statement (except for those financial statements of Enterra and the Enterra
     Subsidiaries furnished by or on behalf of Enterra to Weatherford
     specifically for use therein) will be, prepared in a manner consistent with
     the audited consolidated financial statements and generally accepted
     accounting principles.  As of the date hereof, Weatherford has no material
     liabilities, absolute or contingent, not reflected in the Weatherford
     Commission Filings, except (i) liabilities not required under generally
     accepted accounting principles to be reflected on such financial statements
     or the notes thereto and (ii) liabilities incurred in the ordinary course
     of business since the date of such financial statements consistent with
     past operations and not relating to the borrowing of money.

          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
     CHANGES AND EVENTS.  Since April 1, 1995, except as disclosed in the
     Weatherford Commission Filings filed with the Commission since that date,
     Weatherford and the Weatherford Subsidiaries have conducted their business
     only in the ordinary and usual course, and there has not been (i) any
     Material Adverse Change in Weatherford or any condition, event or
     development that reasonably may be expected to result in any Material
     Adverse Change; (ii) any change by Weatherford in its accounting methods,
     principles or practices; (iii) any revaluation by Weatherford or any of the
     Weatherford Subsidiaries of any of its or their assets, including, without
     limitation, writing down the value of inventory or writing off notes or
     accounts receivable other than in the ordinary course of business; (iv) any
     entry by Weatherford or any of the Weatherford Subsidiaries into any
     commitment or transaction material to Weatherford and the Weatherford
     Subsidiaries, taken as a whole, other than in the ordinary course of
     business; (v) any declaration, setting aside or payment of any dividends or
     distributions in respect of the Weatherford Common Stock, or any
     redemption, purchase or other acquisition of any of its securities or any
     securities of any of the Weatherford Subsidiaries; (vi) any damage,
     destruction or loss (whether or not covered by insurance) materially
     adversely affecting the properties or business of Weatherford and the
     Weatherford Subsidiaries, taken as a whole; (vii) any increase in
     indebtedness for borrowed money; (viii) any granting of a security interest
     or lien on any property or assets of Weatherford and the Weatherford
     Subsidiaries, other than Permitted Liens; or (ix) any increase in or
     establishment of any bonus, insurance, severance, deferred compensation,
     pension, retirement, profit sharing, stock option (including, without
     limitation,


                                       -9-

<PAGE>

     the granting of stock options, stock appreciation rights, performance
     awards or restricted stock awards), stock purchase or other employee
     benefit plan or any other increase in the compensation payable or to become
     payable to any officers or key employees of Weatherford or any of the
     Weatherford Subsidiaries.

          (g)  CERTAIN FEES.  Neither Weatherford nor any of its officers,
     directors or employees, on behalf of Weatherford or any of the Weatherford
     Subsidiaries or its or their respective Boards of Directors (or any
     committee thereof), has employed any financial advisor, broker or finder or
     incurred any liability for any financial advisory, brokerage or finders'
     fees or commissions in connection with the transactions contemplated
     hereby.

          (h)  LITIGATION.  Except as disclosed in the Weatherford Commission
     Filings, there are no claims, actions, suits, investigations or proceedings
     pending or, to the knowledge of Weatherford, threatened against or
     affecting Weatherford or any of the Weatherford Subsidiaries or any of
     their respective properties at law or in equity, or any of their respective
     employee benefit plans or fiduciaries of such plans, or before or by any
     federal, state, municipal or other governmental agency or authority, or
     before any arbitration board or panel, wherever located, that, individually
     or in the aggregate, if adversely determined would have a Material Adverse
     Effect, or that involve the risk of criminal liability.

          (i)  EMPLOYEE BENEFIT PLANS.  The Weatherford Disclosure Letter sets
     forth a complete and accurate list of:

               (i)    each "employee welfare benefit plan" (as such term is
          defined in Section 3(1) of the Employee Retirement Income Security Act
          of 1974, as amended ("ERISA")) (the "Weatherford Welfare Plans");

               (ii)   each "employee pension benefit plan" (as such term is
          defined in Section 3(2) of ERISA) (the "Weatherford Pension Plans");
          and

               (iii)  all other employee benefit agreements or arrangements,
          including, without limitation, deferred compensation plans, incentive
          plans, bonus plans or arrangements, stock option plans, stock purchase
          plans, golden parachute agreements, severance pay plans, dependent
          care plans, cafeteria plans, employee assistance programs, scholarship
          programs, employment contracts and other similar plans, agreements and
          arrangements (collectively, with the Weatherford Welfare Plans and the
          Weatherford Pension Plans, the "Weatherford Benefit Plans"),

     that are currently in effect or were maintained within three years of the
     Closing Date, or have been approved before this date but are not yet
     effective, for the benefit of directors, officers, employees or former
     employees (or their beneficiaries) of Weatherford, any of the Weatherford
     Subsidiaries incorporated in the United States (the "Weatherford U.S.
     Subsidiaries") or any member of a controlled group or affiliated service
     group (as defined in Section 414(b), (c), (m) or (o) of the Code) that is
     incorporated or domiciled in the United States of


                                      -10-

<PAGE>

     which Weatherford or any of the Weatherford U.S. Subsidiaries is a member
     (collectively, the "Weatherford Group").  Weatherford and the Weatherford
     U.S. Subsidiaries will provide to Enterra, as to each Weatherford Benefit
     Plan, as applicable, access to a complete and accurate copy of (i) such
     plan, agreement or arrangement; (ii) the trust, group annuity contract or
     other document that provides the funding for such plan; (iii) the most
     recent annual Form 5500, 990 and 1041 reports; (iv) the most recent
     actuarial report or valuation statement; (v) the most current summary plan
     description, handbook or other booklet that describes any Weatherford
     Benefit Plan, and any summary of material modifications prepared after each
     such summary plan description; (vi) the most recent Internal Revenue
     Service ("IRS") determination letter and all rulings or determinations
     requested from the IRS subsequent to the date of such determination letter;
     and (vii) all other pending correspondence from the IRS or the Department
     of Labor received by any member of the Weatherford Group that relates to
     such plan.

          Each Weatherford Welfare Plan and Weatherford Pension Plan (i) is in
     compliance with ERISA, including, without limitation, all reporting and
     disclosure requirements of Part 1 of Subtitle B of Title I of ERISA, except
     where the failure to be in compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect; (ii) is in compliance with
     the Code, except where the failure to be in compliance would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iii) has
     had the appropriate Form 5500 timely filed for any Weatherford Pension
     Plan, if applicable, for each year of its existence and for any Weatherford
     Welfare Plan for each year of its existence after 1987, except where the
     failure to cause such timely filing would not, either individually or in
     the aggregate, have a Material Adverse Effect; (iv) has not engaged in any
     transaction described in Section 406 or 407 of ERISA or Section 4975 of the
     Code unless it received or is entitled to an exemption under Section 408 of
     ERISA or Section 4975 of the Code, as applicable, or unless such
     transaction has been corrected and all applicable excise taxes paid or
     waived; (v) has no issue pending (other than the payment of benefits in the
     normal course or the qualification of the plan pursuant to an application
     pending before the IRS) nor any issue resolved adversely to the Weatherford
     Group that, in either case, may subject the Weatherford Group to the
     payment of a penalty, interest, tax or other amount, which, either
     individually or in the aggregate, would have a Material Adverse Effect; and
     (vi) can be unilaterally terminated or amended on no more than 90 days
     notice.  No notice has been received by the Weatherford Group of an
     increase or proposed increase in any premium relative to any Weatherford
     Benefit Plan, and no amendment to any Weatherford Benefit Plan within the
     last twelve months has increased the rate of employer contributions
     thereunder that, either individually or in the aggregate, would have a
     Material Adverse Effect.

          Each Weatherford Benefit Plan that is intended to be a voluntary
     employee benefit association has been submitted to and approved by the IRS
     as exempt from federal income tax under Section 501(c)(9) of the Code or
     the applicable submission period relating to any such plan will not have
     ended prior


                                      -11-

<PAGE>

     to the Closing.  No Weatherford Benefit Plan will cause the Weatherford
     Group to have liability for severance pay as a result of this Agreement.
     The Weatherford Group does not provide employee post-retirement medical or
     health coverage or contribute to or maintain any employee welfare benefit
     plan that provides for health benefit coverage following termination of
     employment except as required by Section 4980B(f) of the Code or other
     applicable statute, nor has the Weatherford Group made any representations,
     agreements, covenants or commitments to provide that coverage.

          Except for each Weatherford Pension Plan that is an ERISA top-hat
     plan, each Weatherford Pension Plan has been submitted to and approved as
     qualifying under Section 401(a) of the Code by the IRS or the applicable
     remedial amendment period relating to such plan will not have ended prior
     to the Closing.  To the knowledge of Weatherford, no facts have occurred
     that, if known by the IRS, could cause disqualification of any Weatherford
     Pension Plan.  Each Weatherford Pension Plan to which Section 412 of the
     Code is applicable fully complies with the funding requirements of that
     Section and there is no accumulated funding deficiency as defined in
     Section 302(a)(2) of ERISA (whether or not waived) in any such plan.  The
     Weatherford Group has paid all premiums (including, without limitation,
     interest, charges and penalties for late payment) due the Pension Benefit
     Guaranty Corporation (the "PBGC") with respect to each Weatherford Pension
     Plan for which premiums are required.  No Weatherford Pension Plan has been
     terminated under circumstances that would result in liability to the PBGC
     or the Weatherford Group.  There has been no "reportable event" (as defined
     in Section 4043(b) of ERISA and the regulations under that Section) with
     respect to any Weatherford Pension Plan subject to Title IV of ERISA.  With
     respect to each Weatherford Pension Plan subject to Title IV of ERISA, the
     Weatherford Group has not (i) ceased operations at a facility so as to
     become subject to the provisions of Section 4062(e) of ERISA,
     (ii) withdrawn as a substantial employer so as to become subject to the
     provisions of Section 4063 of ERISA or (iii) ceased making contributions on
     or before the Closing Date to any such plan subject to Section 4064(a) of
     ERISA to which the Weatherford Group made contributions at any time during
     the six years prior to the Closing Date.  Neither the Weatherford Group nor
     any member thereof has made a complete or partial withdrawal from a
     multiemployer plan (as defined in Section 3(37) of ERISA) so as to incur
     withdrawal liability as defined in Section 4201 of ERISA.

          Weatherford's subsidiaries incorporated outside of the United States
     and any benefit plans maintained by any of them for the benefit of their
     directors, officers, employees or former employees (or any of their
     beneficiaries) are in compliance with applicable laws pertaining to such
     plans in the jurisdictions of such subsidiaries, except where such failure
     to be in compliance would not, either individually or in the aggregate,
     have a Material Adverse Effect.

          (j)  TAXES.  All returns and reports, including, without limitation,
     information and withholding returns and reports ("Tax Returns") of or
     relating to any foreign, federal, state or local tax, assessment or other
     governmental


                                      -12-

<PAGE>

     charge ("Taxes" or a "Tax") that are required to be filed on or before the
     Closing Date by or with respect to Weatherford or any of the Weatherford
     Subsidiaries have been or will be duly and timely filed, and all Taxes,
     including, without limitation, interest and penalties, due and payable
     pursuant to such Tax Returns have been paid or adequately provided for in
     reserves established by Weatherford, except where the failure to file, pay
     or provide for would not, either individually or in the aggregate, have a
     Material Adverse Effect.  All Tax Returns of or with respect to Weatherford
     or any of the Weatherford Subsidiaries have been audited by the applicable
     governmental authority, or the applicable statute of limitations has
     expired, for all periods up to and including, without limitation, the tax
     year ended December 31, 1987.  There is no material claim against
     Weatherford or any of the Weatherford Subsidiaries with respect to any
     Taxes, and no material assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return of or with respect to
     Weatherford or any of the Weatherford Subsidiaries that has not been
     adequately provided for in reserves established by Weatherford.  The total
     amounts set up as liabilities for current and deferred Taxes in the
     consolidated financial statements included in the Weatherford Commission
     Filings have been prepared in accordance with generally accepted accounting
     principles and are sufficient to cover the payment of all material Taxes,
     including, without limitation, any penalties or interest thereon and
     whether or not assessed or disputed, that are, or are hereafter finally
     determined to be, or to have been, due with respect to the operations of
     Weatherford and the Weatherford Subsidiaries through the periods covered
     thereby.

          (k)  ENVIRONMENTAL.

               (i)    There are no facts, conditions or circumstances known to
          Weatherford that could cause Weatherford or any Weatherford Subsidiary
          to incur any loss, liability, damage, cost or expense, either
          individually or in the aggregate, in excess of Weatherford's charges,
          accruals and reserves for environmental matters reflected on
          Weatherford's consolidated balance sheet contained in the most recent
          Weatherford Commission Filing, for (A) violations of Environmental
          Laws, (B) failure to obtain an Environmental Permit, (C) a requirement
          to install environmental or pollution control equipment, (D) removal,
          response or remedial costs related to Hazardous Materials or
          (E) personal injury, property damage or natural resources damage
          resulting from exposure to or releases of Hazardous Materials, except
          in each case where such loss, liability, damage, cost or expense would
          not have a Material Adverse Effect.

               (ii)   The business and any other operations conducted by
          Weatherford or any Weatherford Subsidiary are in compliance with all
          applicable limitations, restrictions, conditions, standards,
          prohibitions, requirements and obligations established under
          applicable Environmental Laws, except where the failure to be in
          compliance would not, either individually or in the aggregate, have a
          Material Adverse Effect.


                                      -13-


<PAGE>

          (l)  NO SEVERANCE PAYMENTS.  None of Weatherford or the Weatherford
     Subsidiaries will owe a severance payment or similar obligation to any of
     their respective employees, officers or directors as a result of the Merger
     or the transactions contemplated by this Agreement, nor will any of such
     persons be entitled to an increase in severance payments or other benefits
     as a result of the Merger or the transactions contemplated by this
     Agreement in the event of the subsequent termination of their employment.

          (m)  VOTING REQUIREMENTS.  The affirmative vote of the holders of a
     majority of the outstanding shares of Weatherford Common Stock is the only
     vote of the holders of any class or series of the capital stock of
     Weatherford necessary to approve this Agreement and the Merger.

          (n)  INSURANCE.  The Weatherford Disclosure Letter sets forth all
     policies of insurance currently in effect relating to the business or
     operations of Weatherford and the Weatherford Subsidiaries.

          (o)  TITLE TO PROPERTY.  Except as set forth in the Weatherford
     Commission Filings, Weatherford and each of the Weatherford Subsidiaries
     have good and indefeasible title to all of their real properties purported
     to be owned in fee and good title to all their other material assets, free
     and clear of all mortgages, liens, charges and encumbrances other than
     Permitted Liens.

          (p)  WEATHERFORD ACTIONS.  As of the date hereof, the Board of
     Directors of Weatherford (at a meeting duly called and held) has resolved
     to recommend approval and adoption of this Agreement and the Merger by the
     stockholders of Weatherford.  Merrill Lynch & Co. has delivered to the
     Board of Directors of Weatherford its opinion that the Conversion Rate is
     fair to the holders of Weatherford Common Stock from a financial point of
     view.

     2.3  REPRESENTATIONS AND WARRANTIES OF ENTERRA.  Enterra hereby represents
and warrants to Weatherford that, except as expressly contemplated by this
Agreement or as set forth in the disclosure letter delivered by Enterra to
Weatherford on the date hereof (the "Enterra Disclosure Letter"):

          (a)  ORGANIZATION AND COMPLIANCE WITH LAW.  Enterra and each of its
     corporate subsidiaries (the "Enterra Subsidiaries") is a corporation duly
     organized, validly existing and in good standing under the laws of the
     jurisdiction in which it is organized and has all requisite corporate power
     and authority and all necessary governmental authorizations to own, lease
     and operate all of its properties and assets and to carry on its business
     as now being conducted, except where the failure to do so would not, either
     individually or in the aggregate, have a Material Adverse Effect.  Enterra
     and each of the Enterra Subsidiaries is duly qualified as a foreign
     corporation to do business, and is in good standing, in each jurisdiction
     in which the property owned, leased or operated by it or the nature of the
     business conducted by it makes such qualification necessary, except in such
     jurisdictions where the failure to do so does not and would not, either
     individually or in the aggregate, have a Material


                                      -14-

<PAGE>

     Adverse Effect.  Enterra and each of the Enterra Subsidiaries is in
     compliance with all applicable laws, judgments, orders, rules and
     regulations, domestic and foreign, except where failure to be in such
     compliance would not, either individually or in the aggregate, have a
     Material Adverse Effect.  Enterra has heretofore delivered to Weatherford
     true and complete copies of Enterra's Restated Certificate of Incorporation
     and bylaws, as in existence on the date hereof.

          (b)  CAPITALIZATION.

               (i)    The authorized capital stock of Enterra consists of
          40,000,000 shares of Enterra Common Stock, par value $1.00 per share,
          and 10,000,000 shares of series preferred stock, par value $1.00 per
          share.  As of June 21, 1995, there were issued and outstanding
          27,774,950 shares of Enterra Common Stock and no shares of series
          preferred stock, and no shares of Enterra Common Stock were held as
          treasury shares.  As of June 21, 1995, there were reserved for
          issuance 2,587,071 shares of Enterra Common Stock pursuant to stock
          option plans (collectively, the "Enterra Options").  All issued shares
          of Enterra Common Stock are validly issued, fully paid and
          nonassessable and no holder thereof is entitled to preemptive rights.
          Enterra is not a party to, and, excluding agreements among various
          funds held or managed by institutional investors, has no knowledge of,
          any voting agreement, voting trust or similar agreement or arrangement
          relating to any class or series of its capital stock, or any agreement
          or arrangement providing for registration rights with respect to any
          capital stock or other securities of Enterra.  All outstanding shares
          of capital stock of the Enterra Subsidiaries are owned by Enterra,
          free and clear of all liens, charges, encumbrances, adverse claims and
          options of any nature; provided, however, that Enterra's ownership of
          shares of capital stock of certain foreign Enterra Subsidiaries may be
          subject to Permitted Liens.

               (ii)   Other than as set forth in this Section 2.3(b) and as
          contemplated by Section 4.1(b)(iii), there are not now, and at the
          Effective Time there will not be, any (A) shares of capital stock or
          other equity securities of Enterra outstanding (other than Enterra
          Common Stock issued pursuant to Enterra Options as described herein)
          or (B) outstanding options, warrants, scrip, rights to subscribe for,
          calls or commitments of any character whatsoever relating to, or
          securities or rights convertible into or exchangeable for, shares of
          any class of capital stock of Enterra, or contracts, understandings or
          arrangements to which Enterra is a party, or by which it is or may be
          bound, to issue additional shares of its capital stock or options,
          warrants, scrip or rights to subscribe for, or securities or rights
          convertible into or exchangeable for, any additional shares of its
          capital stock.

          (c)  AUTHORIZATION AND VALIDITY OF AGREEMENT.  Enterra has all
     requisite corporate power and authority to enter into this Agreement and to
     perform its


                                      -15-

<PAGE>

     obligations hereunder.  The execution and delivery by Enterra of this
     Agreement and the consummation by it of the transactions contemplated
     hereby have been duly authorized by all necessary corporate action (subject
     only, with respect to the Merger, to adoption and approval of this
     Agreement by its stockholders as provided for in Section 5.3(a)).  This
     Agreement has been duly executed and delivered by Enterra and is the valid
     and binding obligation of Enterra, enforceable against Enterra in
     accordance with its terms, except as such enforceability may be limited or
     affected by (i) bankruptcy, insolvency, reorganization, moratorium,
     liquidation, arrangement, fraudulent transfer, fraudulent conveyance and
     other similar laws (including, without limitation, court decisions) now or
     hereafter in effect and affecting the rights and remedies of creditors
     generally or providing for the relief of debtors, (ii) the refusal of a
     particular court to grant equitable remedies, including, without
     limitation, specific performance and injunctive relief, and (iii) general
     principles of equity (regardless of whether such remedies are sought in a
     proceeding in equity or at law).

          (d)  NO APPROVALS OR NOTICES REQUIRED; NO CONFLICT WITH INSTRUMENTS TO
     WHICH ENTERRA IS A PARTY.  Neither the execution and delivery of this
     Agreement nor the performance by Enterra of its obligations hereunder, nor
     the consummation of the transactions contemplated hereby by Enterra, will
     (i) conflict with Enterra's Restated Certificate of Incorporation or
     bylaws; (ii) assuming satisfaction of the requirements set forth in
     clause (iii) below, violate any provision of law applicable to Enterra;
     (iii) except for (A) requirements of Federal and state securities law,
     (B) requirements arising out of the HSR Act, (C) requirements of filings in
     such foreign jurisdictions as may be applicable and (D) the filing of a
     certificate of merger in accordance with the DGCL, require any consent or
     approval of, or filing with or notice to, any public body or authority,
     domestic or foreign, under any provision of law applicable to Enterra; or
     (iv) require any consent, approval or notice under, or violate, breach, be
     in conflict with or constitute a default (or an event that, with notice or
     lapse of time or both, would constitute a default) under, or permit the
     termination of any provision of, or result in the creation or imposition of
     any lien upon any properties, assets or business of Enterra under, any
     note, bond, indenture, mortgage, deed of trust, lease, franchise, permit,
     authorization, license, contract, instrument or other agreement or
     commitment or any order, judgment or decree to which Enterra is a party or
     by which Enterra or any of its assets or properties is bound or encumbered,
     except those that have already been given, obtained or filed and except in
     any of the cases enumerated in clauses (ii) through (iv), those that, in
     the aggregate, would not have a Material Adverse Effect.

          (e)  COMMISSION FILINGS; FINANCIAL STATEMENTS.  Since January 1, 1992,
     Enterra and each of the Enterra Subsidiaries have filed all reports,
     registration statements and other filings, together with any amendments
     required to be made with respect thereto, that they have been required to
     file with the Commission under the Securities Act and the Exchange Act.
     All reports, registration statements and other filings (including, without
     limitation, all notes, exhibits and


                                      -16-

<PAGE>

     schedules thereto and documents incorporated by reference therein) filed by
     Enterra with the Commission since January 1, 1992 through the date of this
     Agreement, together with any amendments thereto, are sometimes collectively
     referred to as the "Enterra Commission Filings".  Enterra has heretofore
     delivered to Weatherford copies of the Enterra Commission Filings.  As of
     the effectiveness dates declared by the Commission, in the case of
     registration statements, as of the mailing dates, in the case of proxy
     statements, or as of the filing dates with the Commission, in the case of
     all other Enterra Commission Filings, the Enterra Commission Filings
     complied, and the Proxy Statement (except with respect to information
     concerning Weatherford and the Weatherford Subsidiaries furnished by or on
     behalf of Weatherford to Enterra specifically for use therein) will comply,
     in all material respects with the Securities Act, the Exchange Act and the
     rules and regulations of the Commission promulgated thereunder, as
     applicable, and did not or will not, as the case may be, contain any untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements made therein, in
     light of the circumstances under which they were made, not misleading.

          All material contracts of Enterra and the Enterra Subsidiaries have
     been included in the Enterra Commission Filings, except for those contracts
     not required to be filed pursuant to the rules and regulations of the
     Commission.

          Each of the audited consolidated financial statements (including,
     without limitation, any related notes or schedules) included or
     incorporated by reference in the Enterra Commission Filings was, and each
     of the audited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement (except for those
     financial statements of Weatherford and the Weatherford Subsidiaries
     furnished by or on behalf of Weatherford to Enterra specifically for use
     therein) will be, prepared in accordance with generally accepted accounting
     principles applied on a consistent basis (except as may be noted therein or
     in the notes or schedules thereto), and fairly presents or will fairly
     present, as the case may be, in all material respects, the consolidated
     financial position of Enterra and the Enterra Subsidiaries as of the dates
     thereof and the statements of income, cash flows and stockholders' equity
     for the periods then ended in accordance with generally accepted accounting
     principles.  Each of the unaudited interim financial statements included or
     incorporated by reference in the Enterra Commission Filings was, and each
     of the unaudited consolidated financial statements to be included or
     incorporated by reference in the Proxy Statement (except for those
     financial statements of Weatherford and the Weatherford Subsidiaries
     furnished by or on behalf of Weatherford to Enterra specifically for use
     therein) will be, prepared in a manner consistent with the audited
     consolidated financial statements and generally accepted accounting
     principles.  As of the date hereof, Enterra has no material liabilities,
     absolute or contingent, not reflected in the Enterra Commission Filings,
     except (i) liabilities not required under generally accepted accounting
     principles to be reflected on such financial statements or the notes
     thereto and (ii) liabilities incurred in the ordinary course of business
     since the date of such financial


                                      -17-

<PAGE>

     statements consistent with past operations and not relating to the
     borrowing of money.

          (f)  CONDUCT OF BUSINESS IN THE ORDINARY COURSE; ABSENCE OF CERTAIN
     CHANGES AND EVENTS.  Since April 1, 1995, except as disclosed in the
     Enterra Commission Filings filed with the Commission since that date,
     Enterra and the Enterra Subsidiaries have conducted their business only in
     the ordinary and usual course, and there has not been (i) any Material
     Adverse Change in Enterra or any condition, event or development that
     reasonably may be expected to result in any Material Adverse Change;
     (ii) any change by Enterra in its accounting methods, principles or
     practices; (iii) any revaluation by Enterra or any of the Enterra
     Subsidiaries of any of its or their assets, including, without limitation,
     writing down the value of inventory or writing off notes or accounts
     receivable other than in the ordinary course of business; (iv) any entry by
     Enterra or any of the Enterra Subsidiaries into any commitment or
     transaction material to Enterra and the Enterra Subsidiaries, taken as a
     whole, other than in the ordinary course of business; (v) any declaration,
     setting aside or payment of any dividends or distributions in respect of
     the Enterra Common Stock, or any redemption, purchase or other acquisition
     of any of its securities or any securities of any of the Enterra
     Subsidiaries; (vi) any damage, destruction or loss (whether or not covered
     by insurance) materially adversely affecting the properties or business of
     Enterra and the Enterra Subsidiaries, taken as a whole; (vii) any increase
     in indebtedness for borrowed money; (viii) any granting of a security
     interest or lien on any property or assets of Enterra and the Enterra
     Subsidiaries, other than Permitted Liens; or (ix) any increase in or
     establishment of any bonus, insurance, severance, deferred compensation,
     pension, retirement, profit sharing, stock option (including, without
     limitation, the granting of stock options, stock appreciation rights,
     performance awards or restricted stock awards), stock purchase or other
     employee benefit plan or any other increase in the compensation payable or
     to become payable to any officers or key employees of Enterra or any of the
     Enterra Subsidiaries.

          (g)  CERTAIN FEES.  Neither Enterra nor any of its officers, directors
     or employees, on behalf of Enterra or any of the Enterra Subsidiaries or
     its or their respective Boards of Directors (or any committee thereof), has
     employed any financial advisor, broker or finder or incurred any liability
     for any financial advisory, brokerage or finders' fees or commissions in
     connection with the transactions contemplated hereby.

          (h)  LITIGATION.  Except as disclosed in the Enterra Commission
     Filings, there are no claims, actions, suits, investigations or proceedings
     pending or, to the knowledge of Enterra, threatened against or affecting
     Enterra or any of the Enterra Subsidiaries or any of their respective
     properties at law or in equity, or any of their respective employee benefit
     plans or fiduciaries of such plans, or before or by any federal, state,
     municipal or other governmental agency or authority, or before any
     arbitration board or panel, wherever located, that, individually or in the
     aggregate, if adversely determined would have a Material Adverse Effect, or
     that involve the risk of criminal liability.


                                      -18-

<PAGE>

          (i)  EMPLOYEE BENEFIT PLANS.  The Enterra Disclosure Letter sets forth
     a complete and accurate list of:

               (i)    each "employee welfare benefit plan" (as such term is
          defined in Section 3(1) of ERISA) (the "Enterra Welfare Plans");

               (ii)   each "employee pension benefit plan" (as such term is
          defined in Section 3(2) of ERISA) (the "Enterra Pension Plans"); and

               (iii)  all other employee benefit agreements or arrangements,
          including, without limitation, deferred compensation plans, incentive
          plans, bonus plans or arrangements, stock option plans, stock purchase
          plans, golden parachute agreements, severance pay plans, dependent
          care plans, cafeteria plans, employee assistance programs, scholarship
          programs, employment contracts and other similar plans, agreements and
          arrangements (collectively, with the Enterra Welfare Plans and the
          Enterra Pension Plans, the "Enterra Benefit Plans"),

     that are currently in effect or were maintained within three years of the
     Closing Date, or have been approved before this date but are not yet
     effective, for the benefit of directors, officers, employees or former
     employees (or their beneficiaries) of Enterra, any of the Enterra
     Subsidiaries incorporated in the United States (the "Enterra U.S.
     Subsidiaries") or any member of a controlled group or affiliated service
     group (as defined in Sections 414(b),(c),(m) and (o) of the Code) that is
     incorporated or domiciled in the United States of which Enterra or any of
     the Enterra U.S. Subsidiaries is a member (collectively, the "Enterra
     Group").  Enterra and the Enterra U.S. Subsidiaries will provide to
     Weatherford, as to each Enterra Benefit Plan, as applicable, access to a
     complete and accurate copy of (i) such plan, agreement or arrangement;
     (ii) the trust, group annuity contract or other document that provides the
     funding for such plan; (iii) the most recent annual Form 5500, 990 and 1041
     reports; (iv) the most recent actuarial report or valuation statement;
     (v) the most current summary plan description, handbook or other booklet
     that describes any Enterra Benefit Plan, and any summary of material
     modifications prepared after each such summary plan description; (vi) the
     most recent IRS determination letter and all rulings or determinations
     requested from the IRS subsequent to the date of such determination letter;
     and (vii) all other pending correspondence from the IRS or the Department
     of Labor received by any member of the Enterra Group that relates to such
     plan.

          Each Enterra Welfare Plan and Enterra Pension Plan (i) is in
     compliance with ERISA, including, without limitation, all reporting and
     disclosure requirements of Part 1 of Subtitle B of Title I of ERISA, except
     where the failure to be in compliance would not, either individually or in
     the aggregate, have a Material Adverse Effect; (ii) is in compliance with
     the Code, except where the failure to be in compliance would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iii) has
     had the appropriate Form 5500 timely filed for any Enterra Pension Plan, if
     applicable, for each year of its existence


                                      -19-

<PAGE>

     and for any Enterra Welfare Plan for each year of its existence after 1987,
     except where the failure to cause such timely filing would not, either
     individually or in the aggregate, have a Material Adverse Effect; (iv) has
     not engaged in any transaction described in Section 406 or 407 of ERISA or
     Section 4975 of the Code unless it received or is entitled to an exemption
     under Section 408 of ERISA or Section 4975 of the Code, as applicable, or
     unless such transaction has been corrected and all applicable excise taxes
     paid or waived; (v) has no issue pending (other than the payment of
     benefits in the normal course or the qualification of the plan pursuant to
     an application pending before the IRS) nor any issue resolved adversely to
     the Enterra Group that, in either case, may subject the Enterra Group to
     the payment of a penalty, interest, tax or other amount, which, either
     individually or in the aggregate, would have a Material Adverse Effect; and
     (vi) can be unilaterally terminated or amended on no more than 90 days
     notice.  No notice has been received by the Enterra Group of an increase or
     proposed increase in any premium relative to any Enterra Benefit Plan, and
     no amendment to any Enterra Benefit Plan within the last twelve months has
     increased the rate of employer contributions thereunder that, either
     individually or in the aggregate, would have a Material Adverse Effect.

          Each Enterra Benefit Plan that is intended to be a voluntary employee
     benefit association has been submitted to and approved by the IRS as exempt
     from federal income tax under Section 501(c)(9) of the Code or the
     applicable submission period relating to any such plan will not have ended
     prior to the Closing.  No Enterra Benefit Plan will cause the Enterra Group
     to have liability for severance pay as a result of this Agreement.  The
     Enterra Group does not provide employee post-retirement medical or health
     coverage or contribute to or maintain any employee welfare benefit plan
     that provides for health benefit coverage following termination of
     employment except as required by Section 4980B(f) of the Code or other
     applicable statute, nor has the Enterra Group made any representations,
     agreements, covenants or commitments to provide that coverage.

          Except for each Enterra Pension Plan that is an ERISA top-hat plan,
     each Enterra Pension Plan has been submitted to and approved as qualifying
     under Section 401(a) of the Code by the IRS or the applicable remedial
     amendment period relating to such plan will not have ended prior to the
     Closing.  To the knowledge of Enterra, no facts have occurred that, if
     known by the IRS, could cause disqualification of any Enterra Pension Plan.
     Each Enterra Pension Plan to which Section 412 of the Code is applicable
     fully complies with the funding requirements of that Section and there is
     no accumulated funding deficiency as defined in Section 302(a)(2) of ERISA
     (whether or not waived) in any such plan.  The Enterra Group has paid all
     premiums (including, without limitation, interest, charges and penalties
     for late payment) due the PBGC with respect to each Enterra Pension Plan
     for which premiums are required.  No Enterra Pension Plan has been
     terminated under circumstances that would result in liability to the PBGC
     or the Enterra Group.  There has been no "reportable event" (as defined in
     Section 4043(b) of ERISA and the regulations under that Section) with
     respect to any Enterra Pension Plan subject to Title IV of ERISA.


                                      -20-

<PAGE>

     With respect to each Enterra Pension Plan subject to Title IV of ERISA, the
     Enterra Group has not (i) ceased operations at a facility so as to become
     subject to the provisions of Section 4062(e) of ERISA, (ii) withdrawn as a
     substantial employer so as to become subject to the provisions of
     Section 4063 of ERISA or (iii) ceased making contributions on or before the
     Closing Date to any such plan subject to Section 4064(a) of ERISA to which
     the Enterra Group made contributions at any time during the six years prior
     to the Closing Date.  Neither the Enterra Group nor any member thereof has
     made a complete or partial withdrawal from a multiemployer plan (as defined
     in Section 3(37) of ERISA) so as to incur withdrawal liability as defined
     in Section 4201 of ERISA.

          Enterra's subsidiaries incorporated outside of the United States and
     any benefit plans maintained by any of them for the benefit of their
     directors, officers, employees or former employees (or any of their
     beneficiaries) are in compliance with applicable laws pertaining to such
     plans in the jurisdictions of such subsidiaries, except where such failure
     to be in compliance would not, either individually or in the aggregate,
     have a Material Adverse Effect.

          (j)  TAXES.  All Tax Returns of or relating to any Taxes that are
     required to be filed on or before the Closing Date by or with respect to
     Enterra or any of the Enterra Subsidiaries have been or will be duly and
     timely filed, and all Taxes, including, without limitation, interest and
     penalties, due and payable pursuant to such Tax Returns have been paid or
     adequately provided for in reserves established by Enterra, except where
     the failure to file, pay or provide for would not, either individually or
     in the aggregate, have a Material Adverse Effect.  All Tax Returns of or
     with respect to Enterra or any of the Enterra Subsidiaries have been
     audited by the applicable governmental authority, or the applicable statute
     of limitations has expired, for all periods up to and including, without
     limitation, the tax year ended December 31, 1987.  There is no material
     claim against Enterra or any of the Enterra Subsidiaries with respect to
     any Taxes, and no material assessment, deficiency or adjustment has been
     asserted or proposed with respect to any Tax Return of or with respect to
     Enterra or any of the Enterra Subsidiaries that has not been adequately
     provided for in reserves established by Enterra.  The total amounts set up
     as liabilities for current and deferred Taxes in the consolidated financial
     statements included in the Enterra Commission Filings have been prepared in
     accordance with generally accepted accounting principles and are sufficient
     to cover the payment of all material Taxes, including, without limitation,
     any penalties or interest thereon and whether or not assessed or disputed,
     that are, or are hereafter finally determined to be, or to have been, due
     with respect to the operations of Enterra and the Enterra Subsidiaries
     through the periods covered thereby.

          (k)  ENVIRONMENTAL.

               (i)    There are no facts, conditions or circumstances known to
          Enterra that could cause Enterra or any Enterra Subsidiary to incur
          any loss, liability, damage, cost or expense, either individually or
          in the aggregate, in excess of Enterra's charges, accruals and
          reserves for


                                      -21-

<PAGE>

          environmental matters reflected on Enterra's consolidated balance
          sheet contained in the most recent Enterra Commission Filing, for
          (A) violations of Environmental Laws, (B) failure to obtain an
          Environmental Permit, (C) a requirement to install environmental or
          pollution control equipment, (D) removal, response or remedial costs
          related to Hazardous Materials or (E) personal injury, property damage
          or natural resources damage resulting from exposure to or releases of
          Hazardous Materials, except in each case where such loss, liability,
          damage, cost or expense would not have a Material Adverse Effect.

               (ii)   The business and any other operations conducted by Enterra
          or any Enterra Subsidiary are in compliance with all applicable
          limitations, restrictions, conditions, standards, prohibitions,
          requirements and obligations established under applicable
          Environmental Laws, except where the failure to be in compliance would
          not, either individually or in the aggregate, have a Material Adverse
          Effect.

          (l)  NO SEVERANCE PAYMENTS.  None of Enterra or the Enterra
     Subsidiaries will owe a severance payment or similar obligation to any of
     their respective employees, officers or directors as a result of the Merger
     or the transactions contemplated by this Agreement, nor will any of such
     persons be entitled to an increase in severance payments or other benefits
     as a result of the Merger or the transactions contemplated by this
     Agreement in the event of the subsequent termination of their employment.

          (m)  VOTING REQUIREMENTS.  The affirmative vote of the holders of a
     majority of the outstanding shares of Enterra Common Stock is the only vote
     of the holders of any class or series of the capital stock of Enterra
     necessary to approve this Agreement and the Merger.

          (n)  INSURANCE.  The Enterra Disclosure Letter sets forth all policies
     of insurance currently in effect relating to the business or operations of
     Enterra and the Enterra Subsidiaries.

          (o)  TITLE TO PROPERTY.  Except as set forth in the Enterra Commission
     Filings, Enterra and each of the Enterra Subsidiaries have good and
     indefeasible title to all of their real properties purported to be owned in
     fee and good title to all their other material assets, free and clear of
     all mortgages, liens, charges and encumbrances other than Permitted Liens.

          (p)  ENTERRA ACTIONS.  As of the date hereof, the Board of Directors
     of Enterra (at a meeting duly called and held) has resolved to recommend
     approval and adoption of this Agreement and the Merger by the stockholders
     of Enterra.  Simmons & Company International, Inc. has delivered to the
     Board of Directors of Enterra its opinion that the consideration to be
     received by the holders of Enterra Common Stock in the Merger is fair from
     a financial point of view to such holders.


                                      -22-

<PAGE>

                                   ARTICLE III
              COVENANTS OF WEATHERFORD PRIOR TO THE EFFECTIVE TIME

     3.1  CONDUCT OF BUSINESS BY WEATHERFORD PENDING THE MERGER.  Weatherford
covenants and agrees that, from the date of this Agreement until the Effective
Time, unless Enterra shall otherwise provide its prior consent in writing (which
consent shall not be unreasonably withheld) or as otherwise expressly
contemplated by this Agreement or as set forth in the Weatherford Disclosure
Letter:

          (a)  The business of Weatherford and the Weatherford Subsidiaries
     shall be conducted only in, and Weatherford and the Weatherford
     Subsidiaries shall not take any action except in, the ordinary course of
     business;

          (b)  Weatherford shall not, and shall not permit any of the
     Weatherford Subsidiaries to:

               (i)    split, combine or reclassify any outstanding capital stock
          of Weatherford, or authorize, declare, set aside or pay any dividend
          payable in cash, stock, property or otherwise in respect of the
          capital stock of Weatherford;

               (ii)   authorize or pay any extraordinary bonuses to employees;

               (iii)  grant any stock options or rights to acquire Weatherford
          Common Stock or common stock of any of the Weatherford Subsidiaries to
          any person or entity, other than options to purchase Weatherford
          Common Stock issued pursuant to employee stock option plans in amounts
          consistent with past practice;

               (iv)   authorize or issue, sell, pledge, dispose of or encumber
          any shares of capital stock of Weatherford or, except to Weatherford
          or a wholly-owned Weatherford Subsidiary, any of the Weatherford
          Subsidiaries, other than pursuant to Weatherford Options;

               (v)    sell, pledge, dispose of or encumber any assets of
          Weatherford or any of the Weatherford Subsidiaries, other than (A) in
          the ordinary course of business, (B) not relating to the borrowing of
          money, (C) with respect to purchase money security interests or (D)
          with respect to encumbered assets acquired in connection with an
          acquisition permitted under Section 3.1(b)(viii);

               (vi)   redeem, purchase, acquire or offer to acquire any shares
          of Weatherford Common Stock;

               (vii)  enter into, or grant any material change in, employment,
          compensation, benefit, severance, consulting or stay-bonus
          arrangements;


                                      -23-

<PAGE>

               (viii) acquire any corporation, partnership, other business
          organization or division thereof for a purchase price in excess of
          $5,000,000 or acquire corporations, partnerships, other business
          organizations or divisions thereof for an aggregate purchase price in
          excess of $15,000,000;

               (ix)   enter into any contract, agreement, commitment or
          arrangement other than in the ordinary course of business;

               (x)    authorize any capital expenditures other than in the
          ordinary course of business, and in accordance with a plan previously
          presented to, and not rejected by, the Weatherford Board of Directors;

               (xi)   incur any obligation for borrowed money or purchase money
          indebtedness, whether or not evidenced by a note, bond, debenture or
          similar instrument, except in the ordinary course of business, and in
          no event in excess of the unused credit available from time to time
          under existing credit facilities of Weatherford;

               (xii)  amend or propose to amend the charter or bylaws of
          Weatherford or any of the Weatherford Subsidiaries in which
          Weatherford, either directly or indirectly, has less than a 100%
          equity interest; or

               (xiii) take, and Weatherford shall use its reasonable efforts to
          prevent any affiliate of Weatherford from taking, any action that
          would prevent, including with the passage of time, the Merger's
          qualification for "pooling of interests" accounting treatment or
          prevent the Merger from being treated for federal income tax purposes
          as a reorganization within the meaning of Section 368(a) of the Code;

          (c)  Weatherford shall use all reasonable efforts (i) to preserve
     intact the business organization of Weatherford and each of the Weatherford
     Subsidiaries whose stock is pledged under existing credit facilities,
     (ii) to maintain in effect any material franchises, authorizations or
     similar rights of Weatherford and each of the Weatherford Subsidiaries,
     (iii) to keep available the services of the current officers and key
     employees of Weatherford and each of the Weatherford Subsidiaries, (iv) to
     preserve its goodwill with those having material business relationships
     with Weatherford and the Weatherford Subsidiaries, (v) to maintain and keep
     the material properties of Weatherford and each of the Weatherford
     Subsidiaries in as good a repair and condition as presently exists, except
     for deterioration due to ordinary wear and tear and damage due to casualty,
     and (vi) to maintain in full force and effect insurance comparable in
     amount and scope of coverage to that currently maintained by Weatherford
     and the Weatherford Subsidiaries; and

          (d)  Weatherford shall not, and shall not permit any of the
     Weatherford Subsidiaries to, take any action that would, or that reasonably
     could be expected


                                      -24-

<PAGE>

     to, result in any of the representations and warranties set forth in this
     Agreement becoming untrue or any of the conditions to the Merger set forth
     in Article VI not being satisfied.  Weatherford promptly shall advise
     Enterra orally and in writing of any change or event having, or which,
     insofar as reasonably can be foreseen, would have, a Material Adverse
     Effect on Weatherford.

     3.2  ACCESS TO INFORMATION.  From the date hereof to the Effective Time,
Weatherford shall, and shall cause the Weatherford Subsidiaries and its and
their officers, directors, employees and representatives to, afford the
representatives of Enterra complete access during normal business hours to its
officers, employees, representatives, properties, books and records, and shall
furnish Enterra all financial, operating and other data and information as
Enterra, through its representatives, reasonably may request; PROVIDED, HOWEVER,
that notwithstanding the foregoing provisions of this Section 3.2 or any other
provision of this Agreement, Weatherford shall not be required to provide to
Enterra any information that is the subject of a confidentiality agreement and
that relates primarily to a party other than Weatherford, a Weatherford
Subsidiary or a former subsidiary of Weatherford.

     3.3  AFFILIATES' AGREEMENTS.  Weatherford will use its reasonable efforts
to cause each stockholder who, in the opinion of counsel to Weatherford, is an
"affiliate" of Weatherford to enter into an agreement substantially in the form
of Exhibit 3.3.

     3.4  RESERVATION OF WEATHERFORD COMMON STOCK.  Weatherford shall reserve
for issuance, out of its authorized but unissued capital stock, such number of
shares of Weatherford Common Stock as may be issuable upon consummation of the
Merger.

     3.5  STOCK EXCHANGE LISTING.  Weatherford shall use all reasonable efforts
to cause the shares of Weatherford Common Stock to be issued upon consummation
of the Merger to be approved for listing on the New York Stock Exchange, subject
to official notice of issuance, prior to the Closing Date.

                                   ARTICLE IV
                COVENANTS OF ENTERRA PRIOR TO THE EFFECTIVE TIME

     4.1  CONDUCT OF BUSINESS BY ENTERRA PENDING THE MERGER.  Enterra covenants
and agrees that, from the date of this Agreement until the Effective Time,
unless Weatherford shall otherwise provide its prior consent in writing (which
consent shall not be unreasonably withheld) or as otherwise expressly
contemplated by this Agreement or as set forth in the Enterra Disclosure Letter:

          (a)  The business of Enterra and the Enterra Subsidiaries shall be
     conducted only in, and Enterra and the Enterra Subsidiaries shall not take
     any action except in, the ordinary course of business;

          (b)  Enterra shall not, and shall not permit any of the Enterra
     Subsidiaries to:



                                      -25-

<PAGE>

               (i)    split, combine or reclassify any outstanding capital stock
          of Enterra, or authorize, declare, set aside or pay any dividend
          payable in cash, stock, property or otherwise in respect of the
          capital stock of Enterra;

               (ii)   authorize or pay any extraordinary bonuses to employees;

               (iii)  grant any stock options or rights to acquire Enterra
          Common Stock or common stock of any of the Enterra Subsidiaries to any
          person or entity, other than options to purchase Enterra Common Stock
          issued pursuant to employee stock option plans in amounts consistent
          with past practice;

               (iv)   authorize or issue, sell, pledge, dispose of or encumber
          any shares of capital stock of Enterra or, except to Enterra or a
          wholly-owned Enterra Subsidiary, any of the Enterra Subsidiaries,
          other than pursuant to Enterra Options;

               (v)    sell, pledge, dispose of or encumber any assets of Enterra
          or any of the Enterra Subsidiaries, other than (A) in the ordinary
          course of business, (B) not relating to the borrowing of money,
          (C) with respect to purchase money security interests or (D) with
          respect to encumbered assets acquired in connection with an
          acquisition permitted under Section 4.1(b)(viii);

               (vi)   redeem, purchase, acquire or offer to acquire any shares
          of Enterra Common Stock;

               (vii)  enter into, or grant any material change in, employment,
          compensation, benefit, severance, consulting or stay-bonus
          arrangements;

               (viii) acquire any corporation, partnership, other business
          organization or division thereof for a purchase price in excess of
          $5,000,000 or corporations, partnerships, other business organizations
          or divisions thereof for an aggregate purchase price in excess of
          $15,000,000;

               (ix)   enter into any contract, agreement, commitment or
          arrangement other than in the ordinary course of business;

               (x)    authorize any capital expenditures other than in the
          ordinary course of business, and in accordance with a plan previously
          presented to, and not rejected by, the Enterra Board of Directors;

               (xi)   incur any obligation for borrowed money or purchase money
          indebtedness, whether or not evidenced by a note, bond, debenture or
          similar instrument, except in the ordinary course of business, and in
          no event in excess of the unused credit available from time to time
          under existing credit facilities of Enterra;


                                      -26-

<PAGE>

               (xii)  amend or propose to amend the charter or bylaws of Enterra
          or any of the Enterra Subsidiaries in which Enterra, either directly
          or indirectly, has less than a 100% equity interest; or

               (xiii) take, and Enterra shall use its reasonable efforts to
          prevent any affiliate of Enterra from taking, any action that would
          prevent, including with the passage of time, the Merger's
          qualification for "pooling of interests" accounting treatment or
          prevent the Merger from being treated for federal income tax purposes
          as a reorganization within the meaning of Section 368(a) of the Code;

          (c)  Enterra shall use its reasonable efforts (i) to preserve intact
     the business organization of Enterra and each of the Enterra Subsidiaries
     whose stock is pledged under existing credit facilities, (ii) to maintain
     in effect any material franchises, authorizations or similar rights of
     Enterra and each of the Enterra Subsidiaries, (iii) to keep available the
     services of the current officers and key employees of Enterra and each of
     the Enterra Subsidiaries, (iv) to preserve its goodwill with those having
     material business relationships with Enterra and the Enterra Subsidiaries,
     (v) to maintain and keep the material properties of Enterra and each of the
     Enterra Subsidiaries in as good a repair and condition as presently exists,
     except for deterioration due to ordinary wear and tear and damage due to
     casualty, and (vi) to maintain in full force and effect insurance
     comparable in amount and scope of coverage to that currently maintained by
     Enterra and each of the Enterra Subsidiaries; and

          (d)  Enterra shall not, and shall not permit any of the Enterra
     Subsidiaries to, take any action that would, or that reasonably could be
     expected to, result in any of the representations and warranties set forth
     in this Agreement becoming untrue or any of the conditions to the Merger
     set forth in Article VI not being satisfied.  Enterra promptly shall advise
     Weatherford orally and in writing of any change or event having, or which,
     insofar as reasonably can be foreseen, would have, a Material Adverse
     Effect on Enterra.

     4.2  ACCESS TO INFORMATION.  From the date hereof to the Effective Time,
Enterra shall, and shall cause the Enterra Subsidiaries and its and their
officers, directors, employees and representatives to, afford the
representatives of Weatherford complete access during normal business hours to
its officers, employees, representatives, properties, books and records, and
shall furnish Weatherford all financial, operating and other data and
information as Weatherford, through its representatives, reasonably may request;
PROVIDED, HOWEVER, that notwithstanding the foregoing provisions of this
Section 4.2 or any other provision of this Agreement, Enterra shall not be
required to provide to Weatherford any information that is the subject of a
confidentiality agreement and that relates primarily to a party other than
Enterra, an Enterra Subsidiary or a former subsidiary of Enterra.

     4.3  AFFILIATES' AGREEMENTS.  Enterra will use its reasonable efforts to
cause each stockholder who, in the opinion of counsel to Enterra, is an
"affiliate" of Enterra to enter into an agreement substantially in the form of
Exhibit 4.3.


                                      -27-

<PAGE>

                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

     5.1  JOINT PROXY STATEMENT/PROSPECTUS; REGISTRATION STATEMENT.  As promptly
as practicable after the execution of this Agreement, Weatherford and Enterra
shall prepare and file with the Commission preliminary proxy materials that
shall constitute the joint proxy statement (the "Proxy Statement") of
Weatherford and Enterra and the registration statement with respect to the
Weatherford Common Stock to be issued in connection with the Merger (the
"Registration Statement").  As promptly as practicable after comments are
received from the Commission on the preliminary proxy materials, Weatherford and
Enterra shall file with the Commission a combined joint proxy statement and
registration statement on Form S-4 (or on such other form as shall be
appropriate) relating to the approval and adoption of the Merger and this
Agreement by the stockholders of Weatherford and the stockholders of Enterra and
the issuance by Weatherford of Weatherford Common Stock in connection with the
Merger and shall use their reasonable efforts to cause the Registration
Statement to become effective as soon as practicable.  Subject to the terms and
conditions set forth in Section 7.2, the Proxy Statement shall contain a
statement that the Board of Directors of Enterra recommended that the
stockholders of Enterra approve and adopt the Merger and this Agreement.
Subject to the terms and conditions set forth in Section 7.1, the Proxy
Statement shall contain a statement that the Board of Directors of Weatherford
recommended that the stockholders of Weatherford approve and adopt the Merger
and this Agreement.

     5.2  COMFORT LETTERS.

          (a)  Enterra shall use its reasonable efforts to cause to be delivered
     to Weatherford a letter of KPMG Peat Marwick LLP dated as of a date within
     five business days before the date on which the Registration Statement
     shall become effective and addressed to Weatherford, in form and substance
     reasonably satisfactory to Weatherford and customary in scope and substance
     for "comfort" letters delivered by independent public accountants in
     connection with registration statements and proxy statements similar to the
     Registration Statement and Proxy Statement.

          (b)  Weatherford shall use its reasonable efforts to cause to be
     delivered to Enterra a letter of Arthur Andersen LLP dated as of a date
     within five business days before the date on which the Registration
     Statement shall become effective and addressed to Enterra, in form and
     substance reasonably satisfactory to Enterra and customary in scope and
     substance for "comfort" letters delivered by independent public accountants
     in connection with registration statements and proxy statements similar to
     the Registration Statement and Proxy Statement.

     5.3  MEETINGS OF STOCKHOLDERS.

          (a)  Enterra shall promptly take all action reasonably necessary in
     accordance with the DGCL and its Restated Certificate of Incorporation and


                                      -28-

<PAGE>

     bylaws to convene a meeting of its stockholders to consider and vote upon
     the adoption and approval of the Merger and this Agreement.  Subject to the
     terms and conditions set forth in Section 7.2, the Board of Directors of
     Enterra (i) shall recommend at such meeting that the stockholders of
     Enterra vote to adopt and approve the Merger and this Agreement, (ii) shall
     use its reasonable efforts to solicit from stockholders of Enterra proxies
     in favor of such adoption and approval and (iii) shall take all other
     action reasonably necessary to secure a vote of its stockholders in favor
     of the adoption and approval of the Merger and this Agreement.

          (b)  Weatherford shall promptly take all action reasonably necessary
     in accordance with the DGCL and its Restated Certificate of Incorporation
     and bylaws to convene a meeting of its stockholders to consider and vote
     upon the adoption and approval of the Merger and this Agreement.  Subject
     to the terms and conditions set forth in Section 7.1, the Board of
     Directors of Weatherford (i) shall recommend at such meeting that the
     stockholders of Weatherford vote to adopt and approve the Merger and this
     Agreement, (ii) shall use its reasonable efforts to solicit from
     stockholders of Weatherford proxies in favor of such adoption and approval
     and (iii) shall take all other action reasonably necessary to secure a vote
     of its stockholders in favor of the adoption and approval of the Merger and
     this Agreement.

          (c)  Weatherford and Enterra shall coordinate and cooperate with
     respect to the timing of such meetings and shall endeavor to hold such
     meetings on the same day and as soon as practicable after the date hereof.

     5.4  REASONABLE EFFORTS; CONSENTS, APPROVALS AND WAIVERS.  Upon the terms
and subject to the conditions set forth in this Agreement, each of the parties
agrees to use reasonable efforts to take, or cause to be taken, all actions, and
to do, or cause to be done, and to assist and cooperate with the other party in
doing, all things necessary, proper or advisable (a) to consummate and make
effective, in the most expeditious manner practicable, the Merger, and the other
transactions contemplated by this Agreement, including, without limitation,
(i) the obtaining of all necessary consents, approvals or waivers required in
connection with the authorization, execution and delivery of this Agreement and
the consummation of the Merger (provided that no such consent, approval or
waiver shall require such party to take any action that would impair the value
that such party reasonably attributes to the Merger) and (ii) the execution and
delivery of any additional instruments (including, without limitation, any
required supplemental indentures) necessary to consummate the transactions
contemplated by this Agreement; and (b) to defend any non-regulatory lawsuits or
other legal proceedings, whether judicial or administrative, challenging this
Agreement or the consummation of the transactions contemplated hereby,
including, without limitation, seeking to have any stay or temporary restraining
order entered by any court or other governmental entity vacated or reversed.


                                      -29-

<PAGE>

     5.5  ANTITRUST MATTERS.  The obligations of each of the parties to this
Agreement shall include the following:

          (a)  each of the parties hereto shall file a premerger notification
     and report form pursuant to the HSR Act with respect to the Merger as
     promptly as reasonably possible following execution and delivery of this
     Agreement.  Each of the parties agrees to use best efforts to promptly
     respond to any request for additional information pursuant to
     Section (e)(1) of the HSR Act; and

          (b)  each party hereto will furnish to the other copies of all
     correspondence, filings or communications between that party, or any of its
     representatives, on the one hand, and any governmental agency or authority,
     on the other hand, with respect to pre-notification obligations under any
     antitrust law with respect to this Agreement or the Merger; PROVIDED,
     HOWEVER, that with respect to any documents that the party reasonably
     believes should not be disclosed to the other party, the party shall
     instead furnish those documents to counsel for the other party pursuant to
     a mutually satisfactory confidentiality agreement.

     5.6  NOTIFICATION OF CERTAIN MATTERS.  Enterra shall give prompt notice to
Weatherford, and Weatherford shall give prompt notice to Enterra, orally and in
writing, of (a) the occurrence, or failure to occur, of any event which
occurrence or failure would be likely to cause any representation or warranty
contained in this Agreement to be untrue or inaccurate at any time from the date
hereof to the Effective Time, (b) any material failure of Enterra or
Weatherford, as the case may be, or any officer, director, employee or agent
thereof, to comply with or satisfy any covenant, condition or agreement to be
complied with or satisfied by it hereunder, and (c) any fact or event that would
make it necessary to amend the Registration Statement or the Proxy Statement to
render the statements therein not misleading or to comply with applicable law.


     5.7  AGREEMENT TO DEFEND.  In the event any claim, action, suit,
investigation or other proceeding by any governmental body or other person or
other legal or administrative proceeding is commenced that questions the
validity or legality of the transactions contemplated hereby or seeks damages in
connection therewith, whether before or after the Effective Time, the parties
hereto agree to cooperate and use their reasonable efforts to defend against and
respond thereto; PROVIDED, HOWEVER, that this Section 5.7 shall not apply to any
governmental investigation contemplated under Section 5.5(a).

     5.8  EXPENSES.  Subject to the terms and conditions set forth in
Section 7.3, and except as otherwise agreed to in writing by the parties, all
costs and expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such
expenses.


                                      -30-

<PAGE>

     5.9  INDEMNIFICATION.

          (a)  After the Effective Time Weatherford and the Surviving
     Corporation shall, to the fullest extent permitted under applicable law,
     defend, indemnify and hold harmless each person who is now, or has been at
     any time prior to the date hereof or who becomes prior to the Effective
     Time, an officer or director of Enterra or any of the Enterra Subsidiaries
     (each, an "Indemnified Party" and, collectively, the "Indemnified Parties")
     against (i) all costs or expenses (including, without limitation,
     reasonable attorneys' fees), judgments, fines, losses, claims, damages,
     liabilities and amounts paid in settlement in connection with any claim,
     action, suit, proceeding or investigation, whether civil, criminal,
     administrative or investigative, based in whole or in part on, or arising
     in whole or in part out of, the fact that such person is or was an officer
     or director, whether pertaining to any matter existing or occurring at or
     prior to the Effective Time and whether asserted or claimed prior to, or at
     or after, the Effective Time (collectively, the "Indemnified Liabilities");
     and (ii) all Indemnified Liabilities based in whole or in part on, or
     arising in whole or in part out of, or pertaining to, this Agreement, the
     Merger or the transactions contemplated hereby.  After the Effective Time,
     Weatherford and the Surviving Corporation will be entitled to participate
     in and, to the extent that it may wish, to assume the defense of any
     action, with counsel reasonably satisfactory to the Indemnified Party;
     PROVIDED, HOWEVER, if any Indemnified Party believes that, by reason of an
     actual or potential conflict of interest, it is advisable for such
     Indemnified Party to be represented by separate counsel, or if Weatherford
     or the Surviving Corporation shall fail after the Effective Time to assume
     responsibility for such defense, such Indemnified Party may retain counsel
     reasonably satisfactory to Weatherford and the Surviving Corporation who
     will represent such Indemnified Party, and Weatherford and the Surviving
     Corporation shall pay all reasonable fees and disbursements of such counsel
     promptly as statements therefor are received to the fullest extent
     permitted by applicable law upon receipt of any undertaking contemplated by
     Section 145(e) of the DGCL.  The Indemnified Party, Weatherford and the
     Surviving Corporation will cooperate with each other and use their
     reasonable efforts to assist each other in the vigorous defense of any such
     matter; PROVIDED, HOWEVER, that neither Weatherford nor the Surviving
     Corporation shall be liable for any settlement of any claim effected
     without its written consent, which consent, however, shall not be
     unreasonably withheld.  Any Indemnified Party wishing to claim
     indemnification under this Section 5.9, upon learning of any such claim,
     action, suit, proceeding or investigation, shall promptly notify
     Weatherford or the Surviving Corporation, as applicable (but the failure to
     be so notified by an Indemnified Party shall not relieve an indemnifying
     party from any liability that it may have under this Section 5.9 except to
     the extent such failure materially prejudices such indemnifying party).
     The indemnifying parties shall be required to pay for only one law firm (in
     addition to any required local counsel) selected by the Indemnified Parties
     as a group in accordance with the foregoing provisions with respect to each
     such matter unless there is, under applicable standards of professional
     conduct, a conflict in any significant issue between the positions of any
     two or more Indemnified Parties.  This Section 5.9 is intended


                                      -31-

<PAGE>

     to be for the benefit of, and shall be enforceable by, each Indemnified
     Party, his or her heirs and his or her representatives.

          (b)  For a period of six years after the Effective Time, the Surviving
     Corporation shall use its best efforts to maintain in effect director and
     officer liability insurance for the benefit of the Indemnified Parties in
     comparable amounts, with comparable deductibles or retained amounts and
     with comparable coverages and exclusions as currently maintained by
     Enterra; PROVIDED, HOWEVER, that if the Surviving Corporation is unable to
     obtain insurance for such period for an aggregate premium of $1,000,000 or
     less or if such insurance otherwise cannot be obtained or maintained by the
     Surviving Corporation, then the Surviving Corporation's obligation pursuant
     hereto shall only be to seek to be obtained the best possible coverage
     under the circumstances subject to the foregoing limitation on premiums.

          (c)  All rights and obligations under this Section 5.9 shall be in
     addition to any rights an Indemnified Party may have under the Restated
     Certificate of Incorporation or bylaws of Enterra as in effect on the date
     hereof, or pursuant to any other agreement, arrangement or document in
     effect prior to the Effective Time.  The provisions of this Section 5.9 are
     intended to benefit, and may be enforced by, all Indemnified Parties, and
     their respective heirs and representatives.  This Section 5.9 shall be
     binding upon all successors and assigns of Enterra, Weatherford and the
     Surviving Corporation.

          (d)  If the Surviving Corporation is sold to a third party, such third
     party shall expressly assume the Surviving Corporation's indemnification
     obligation under this Section 5.9.

     5.10 POST-EFFECTIVE TIME MAILING.  As soon as practicable following the
Effective Time, the Surviving Corporation will cause to be mailed to each holder
of certificates that represented Enterra Common Stock prior to the Effective
Time, at such holder's address as it appears on Enterra's stock transfer
records, a letter of transmittal and other information advising such holder of
the consummation of the Merger and to enable such holder to effect the exchange
of stock certificates as contemplated by Article I of this Agreement.

     5.11 STOCKHOLDERS' AGREEMENT.  Weatherford will enter into a Stockholders'
Agreement, and an amendment thereto, with First Reserve Corporation and the
various First Reserve Funds (as defined therein), in the forms attached hereto
as Exhibits 5.11(a) and 5.11(b), respectively.

     5.12 ENTERRA STOCK OPTIONS.  At the Effective Time, each Enterra Option
that remains as of such date unexercised in whole or in part shall be replaced
by a substitute option, granted under an existing Weatherford stock option plan,
to purchase that number of shares of Weatherford Common Stock determined by
multiplying the number of shares of Enterra Common Stock subject to such Enterra
Option by the Conversion Rate and multiplying the exercise price per share of
such Enterra Option by a fraction the numerator of which is one and the
denominator of which is the Conversion Rate.


                                      -32-

<PAGE>

Each such substitute option shall otherwise replicate the terms and conditions
of the Enterra Option it replaces.  Weatherford shall take all corporate action
necessary (a) to reserve for issuance a sufficient number of shares of
Weatherford Common Stock for delivery upon exercise of such Enterra Options,
(b) to ensure that all shares of Weatherford Common Stock subject to such
Enterra Options are issued pursuant to a plan that complies with the exemption
provided by Rule 16b-3 promulgated under the Exchange Act and (c) to ensure that
shares of Weatherford Common Stock issued pursuant to the exercise of such
Enterra Options are registered under the Securities Act, listed on the New York
Stock Exchange and may be freely transferred by the holders thereof.

     5.13 ENTERRA EMPLOYEE BENEFITS.

          (a)  For the period beginning at the Effective Time and ending on
     June 30, 1996, Weatherford will either (i) cause to remain in effect all
     Enterra Benefit Plans, as in effect at the Effective Time, or (ii) provide
     benefits to employees of Enterra and the Enterra Subsidiaries under the
     Weatherford Benefit Plans that are substantially comparable to the benefits
     provided to such employees under the Enterra Benefit Plans, as in effect at
     the Effective Time.  From and after July 1, 1996, Weatherford agrees that
     participation in the Weatherford Benefit Plans, as then in effect, shall be
     made available to all Weatherford employees, including employees who were
     employees of Enterra, and that such plans will provide the same or
     substantially comparable benefits to all similarly situated employees.

          (b)  If participation in any Weatherford Benefit Plan is made
     available to employees of Enterra or any Enterra Subsidiary, all service
     with Enterra and the Enterra Subsidiaries prior to the Effective Time and
     any other service recognized under the applicable Enterra Benefit Plans for
     vesting and eligibility purposes shall be credited to such employees and
     all waiting periods and pre-existing condition limitations shall be waived
     under such Weatherford Benefit Plan.

          (c)  Prior to the Effective Time, Enterra shall have established the
     Enterra Special Severance Pay Plan, in the form attached hereto as
     Exhibit 5.13.

          (d)  Weatherford agrees that it shall make non-elective employer
     contributions, including fixed or discretionary pension, profit sharing and
     matching contributions, to each Enterra Benefit Plan that is intended to be
     a qualified defined contribution plan under Section 401(a) of the Code for
     the respective Enterra Benefit Plan's first plan year ending on or after
     the Effective Time in accordance with the terms of such plan.  Weatherford
     agrees that the rate of each such non-elective employer contribution in
     each case shall not be less than the rate of such non-elective employer
     contribution that was made to the respective Enterra Benefit Plan for the
     last plan year ending prior to the Effective Time.  An employee of Enterra
     or an Enterra Subsidiary who is employed, and who is a participant in an
     Enterra Benefit Plan that is subject to this Section 5.13(d), on the day
     before the Effective Time (an "Eligible Enterra


                                      -33-

<PAGE>

     Employee") shall be entitled to receive an allocation of such non-elective
     employer contributions without regard to whether such employee continues to
     be an employee of Enterra or an Enterra Subsidiary or any successor thereto
     on the last day of the respective Enterra Benefit Plan's plan year (or
     other period) for which such contributions are to be made.  Weatherford
     agrees to make any amendment to the applicable Enterra Benefit Plans as may
     be necessary to effectuate the terms of this Section 5.13(d).

     5.14 UPDATE OF DISCLOSURE LETTERS.

          (a)  Weatherford shall promptly disclose to Enterra in writing (i) any
     information set forth in the Weatherford Disclosure Letter with respect to
     subsections (b), (c), (e) and (g) of Section 2.2 that no longer is accurate
     and with respect to all other subsections of Section 2.2 that no longer is
     accurate in any material respect and (ii) any information of the nature of
     that set forth in the Weatherford Disclosure Letter that arises between the
     date hereof and the Closing and that would have been required to be
     included in the Weatherford Disclosure Letter if such information had
     existed and been known or available on the date hereof.  Neither any such
     new disclosure, nor the determination of Enterra to proceed with the Merger
     in spite of any such new disclosure, shall relieve Weatherford from any
     liability for any prior misrepresentation or breach of warranty.

          (b)  Enterra shall promptly disclose to Weatherford in writing (i) any
     information set forth in the Enterra Disclosure Letter with respect to
     subsections (b), (c), (e) and (g) of Section 2.3 that no longer is accurate
     and with respect to all other subsections of Section 2.3 that no longer is
     accurate in any material respect and (ii) any information of the nature of
     that set forth in the Enterra Disclosure Letter that arises between the
     date hereof and the Closing and that would have been required to be
     included in the Enterra Disclosure Letter if such information had existed
     and been known or available on the date hereof.  Neither any such new
     disclosure, nor the determination of Weatherford to proceed with the Merger
     in spite of any such new disclosure, shall relieve Enterra from any
     liability for any prior misrepresentation or breach of warranty.

     5.15 WEATHERFORD SPECIAL SEVERANCE PAY PLAN.  Prior to the Effective Time,
Weatherford shall have established the Weatherford Special Severance Pay Plan,
in the form attached hereto as Exhibit 5.15.

     5.16 CHANGE OF CONTROL AGREEMENTS.  Weatherford shall, as of the Effective
Time, have entered into change of control agreements, substantially in the form
of Exhibit 5.16(a), with the persons and for the respective severance benefits
set forth on Exhibit 5.16(b).

     5.17 INDEMNIFICATION AGREEMENTS.  Weatherford shall, as of the Effective
Time, have entered into indemnification agreements, substantially in the form of
Weatherford's existing indemnification agreements with the persons set forth on
Exhibit 5.17.


                                      -34-


<PAGE>

     5.18 ENTERRA EMPLOYEE BONUSES.

          (a)  The Enterra Board of Directors or the Executive Compensation
     Committee of the Enterra Board of Directors (the "Enterra Committee") shall
     determine, prior to the Closing Date, the final amount of bonuses to be
     paid to the Enterra employees listed on Exhibit 5.18 for the fiscal year
     ended December 31, 1993, such amount not to exceed the amount that
     previously has been accrued for such bonuses.  Such bonuses shall be paid
     only after collection of at least $10,000,000 of the disputed outstanding
     receivables from Kuwait Oil Company.  If such bonuses are not paid prior to
     the Closing Date, (i) the determination of the Enterra Board of Directors
     or the Enterra Committee, as the case may be, will be binding upon
     Weatherford, (ii) any Enterra employee terminated after such date shall
     receive the entire amount of the bonus determined by the Enterra Board of
     Directors or the Enterra Committee, as the case may be, and (iii) payment
     of such bonuses shall be administered by Messrs. William E. Macaulay and
     Robert L. Parker, Sr., who will be directors of the Surviving Corporation.

          (b)  The Enterra Board of Directors or the Enterra Committee shall
     declare, prior to the Closing Date, the amount of bonuses to Enterra
     employees, based upon Enterra's achievement of certain financial and other
     targets for Enterra for the fiscal year ending December 31, 1995,
     determined by the Enterra Board of Directors or the Enterra Committee, as
     the case may be, in a manner consistent with the Enterra and Total Energy
     Services Company bonus plans under which bonuses were paid for the fiscal
     year ended December 31, 1994.  The final amount of bonuses shall be
     determined by the Enterra Board of Directors or the Enterra Committee, as
     the case may be, if audited financial results for the year ending
     December 31, 1995 are known prior to the Closing Date, or by Messrs.
     Macaulay and Parker, if such results are not known until after the Closing
     Date.  Bonuses will be paid not earlier than February 1, 1996 and not later
     than February 28, 1996.  Any Enterra employee terminated after the Closing
     Date shall receive the entire amount of the bonus.

          (c)  In addition to the 1995 bonuses referenced in Section 5.18(b),
     Enterra may pay bonuses to Enterra employees in an amount not to exceed
     $1,000,000 in the aggregate.  The recipients and amounts of such bonuses
     shall be determined in the sole discretion of the Enterra Committee;
     PROVIDED, HOWEVER, that the total amount paid to any one employee shall not
     exceed the aggregate of the current annualized salary and most recent
     annual bonus of such employee.

     5.19 ENTERRA SEVERANCE AGREEMENTS.

          (a)  Each of the Enterra severance agreements with the individuals set
     forth on Exhibit 5.19(a)(i) shall be amended, pursuant to the form attached
     hereto as Exhibit 5.19(a)(ii), and each of the Enterra severance agreements
     with the individuals set forth on Exhibit 5.19(a)(iii) shall be amended,
     pursuant to the form attached hereto as Exhibit 5.19(a)(iv).


                                      -35-

<PAGE>

          (b)  The parties agree that, as a result of the Merger, any
     resignation by any of M. Timothy Carey, Steven C. Grant, Edward C. Grimes,
     Steven W. Krablin, J. Joseph Percle and Michael L. Stansberry at any time
     from the Effective Time through August 12, 1996 shall constitute a
     "Termination upon Change of Control" (as such term is defined in the
     severance agreement between such person and Enterra).  Further, it is
     agreed that, for purposes of Section 3(a)(ii) of the severance agreement
     between Enterra and each such individual, if the bonus for the 1993 fiscal
     year is required to be taken into account, the final amount of the 1993
     bonus determined by the Enterra Board of Directors or the Enterra Committee
     pursuant to Section 5.18(a) shall be counted, notwithstanding whether the
     disputed receivables from Kuwait Oil Company have been collected.  It is
     further agreed that the manner in which the obligation to provide extended
     medical and dental benefits under Section 4(b) of each such individual's
     severance agreement with Enterra shall be to pay to such individual during
     the full period for which such benefits are required to be extended a
     monthly amount equal to the difference between the applicable COBRA
     continuation premium for such benefits and the premium, if any, charged to
     the individual for such benefits immediately prior to the Change in Control
     (as defined in such severance agreement) and such individual shall pay the
     full premium to the plan.

     5.20 ENTERRA CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.

          (a)  Weatherford shall, as of the Effective Time, have entered into
     definitive arrangements with D. Dale Wood reflecting the principal terms
     set forth in Exhibit 5.20.

          (b)  If the implementation of the principal terms set forth in Exhibit
     5.20 shall make the Merger ineligible for pooling-of-interests accounting
     treatment under Accounting Principles Bulletin No. 16, Enterra agrees to
     use its best efforts to negotiate a package that would provide Mr. Wood in
     the aggregate with a substantially similar economic benefit.

     5.21 WEATHERFORD CHAIRMAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER.
Weatherford shall, as of the Effective Time, pay Philip Burguieres a fee in the
amount set forth in Exhibit 5.21.  If Mr. Burguieres' fee set forth in Exhibit
5.21 shall make the Merger ineligible for pooling-of-interests accounting
treatment under Accounting Principles Bulletin No. 16, Weatherford agrees to use
its best efforts to negotiate an alternative package with Mr. Burguieres.

     5.22 BOARD OF DIRECTORS.

          (a)  The Board of Directors of Weatherford will take action prior to
     the Effective Time to cause the number of directors comprising the full
     Board of Directors of the Surviving Corporation at the Effective Time to be
     increased to ten persons, and the five persons listed on Exhibit 5.22 as
     the Enterra designees to the Board of Directors of the Surviving
     Corporation shall be elected to the Board of Directors of the Surviving
     Corporation by the Weatherford Board of


                                      -36-

<PAGE>

     Directors effective at the Effective Time, such increase in number and such
     election to be subject to the Closing.  The Weatherford Board of Directors
     will also take action prior to the Effective Time to cause the committees
     of the Board of Directors of the Surviving Corporation at the Effective
     Time to be the committees listed on Exhibit 1.6(a) hereto, having the
     membership noted on such Exhibit, such action to be subject to the Closing.
     If prior to the Effective Time, any Enterra designee for director set forth
     on Exhibit 5.22, or if during the two years after the Effective Time, any
     Enterra designated director shall decline or be unable to serve as a
     director of the Surviving Corporation, the other Enterra designees or the
     remaining Enterra designated directors, as the case may be, shall designate
     another person to serve in such person's stead, subject to the approval of
     a majority of the Weatherford designated directors at that time, which
     approval shall not be unreasonably withheld.  Weatherford agrees that,
     during the two year period after the Effective Time, it shall cause at
     least one Enterra designee listed on Exhibit 5.22 (or his successor chosen
     pursuant to this Section 5.22(a)) to be a member of each of the Executive
     and Nominating Committee, Audit Committee and Compensation and Stock Plans
     Committee of the Board of Directors of the Surviving Corporation.
     Weatherford shall take all appropriate action for two years after the
     Effective Time to assist in the nomination for election as directors of the
     Enterra designees listed on Exhibit 5.22 (or any successor chosen pursuant
     to this Section 5.22(a)).

          (b)  Each person designated by Enterra to serve on the Board of
     Directors of the Surviving Corporation, and any person subsequently
     appointed to the Board of Directors of the Surviving Corporation by such
     designees pursuant to Section 5.22(a), shall be covered by the Weatherford
     International Incorporated Non-Employee Director Retirement Plan and the
     prior service of any such person on the Enterra Board of Directors shall
     count as service on the Board of Directors of the Surviving Corporation for
     all purposes under such plan.

          (c)  If prior to the Effective Time, any Weatherford designee for
     director set forth on Exhibit 5.22, or if during the two years after the
     Effective Time, any Weatherford designated director shall decline or be
     unable to serve as a director of the Surviving Corporation, the other
     Weatherford designees or the remaining Weatherford designated directors, as
     the case may be, shall designate another person to serve in such person's
     stead, subject to the approval of a majority of the Enterra designated
     directors at that time, which approval shall not be unreasonably withheld.

                                   ARTICLE VI
                                   CONDITIONS

     6.1  CONDITIONS TO OBLIGATIONS OF EACH PARTY TO EFFECT THE MERGER.  The
respective obligations of each party to effect the Merger shall be subject to
the fulfillment or waiver at or prior to the Closing Date of the following
conditions:


                                      -37-

<PAGE>

          (a)  This Agreement and the Merger shall have been approved and
     adopted by the requisite vote of the stockholders of Weatherford and the
     stockholders of Enterra as may be required by law and by any applicable
     provisions of their respective certificates of incorporation or bylaws;

          (b)  The waiting period (and any extension thereof) applicable to the
     consummation of the Merger under the HSR Act shall have expired or been
     terminated;

          (c)  No order shall have been entered and remain in effect in any
     action or proceeding before any foreign, federal or state court or
     governmental agency or other foreign, federal or state regulatory or
     administrative agency or commission that would prevent or make illegal the
     consummation of the Merger;

          (d)  The Registration Statement shall be effective on the Closing
     Date, and all post-effective amendments filed shall have been declared
     effective or shall have been withdrawn; and no stop order suspending the
     effectiveness thereof shall have been issued and no proceedings for that
     purpose shall have been initiated or, to the knowledge of the parties,
     threatened by the Commission;

          (e)  There shall have been obtained any and all material permits,
     approvals and consents of securities or blue sky commissions of any
     jurisdiction, and of any other governmental body or agency, that reasonably
     may be deemed necessary so that the consummation of the Merger and the
     transactions contemplated thereby will be in compliance with applicable
     laws, the failure to comply with which would have a Material Adverse Effect
     on Enterra or Weatherford; and

          (f)  All approvals of private persons, financial institutions or
     corporations, (i) the granting of which is necessary for the consummation
     of the Merger or the transactions contemplated in connection therewith and
     (ii) the non-receipt of which would have a Material Adverse Effect on
     Enterra or Weatherford, shall have been obtained.

     6.2  ADDITIONAL CONDITIONS TO OBLIGATIONS OF WEATHERFORD.  The obligation
of Weatherford to effect the Merger is, at the option of Weatherford, also
subject to the fulfillment or waiver at or prior to the Closing Date of the
following conditions:

          (a)  The representations and warranties of Enterra contained in
     subsections (b), (c), (e) and (g) of Section 2.3 shall be accurate, and the
     representations and warranties of Enterra contained in all other
     subsections of Section 2.3 shall be accurate in all material respects
     (except to the extent qualified by materiality, in which case such
     representations and warranties shall be accurate), as of the Closing Date
     as though such representations and warranties had been made at and as of
     that time (except where any such representation or warranty is made as of a
     date specifically set forth therein); all of the terms, covenants and
     conditions of this Agreement to be complied with and performed by Enterra
     on or before the Closing Date shall have been duly


                                      -38-

<PAGE>

     complied with and performed in all material respects; and a certificate of
     Enterra to the foregoing effect dated the Closing Date and signed by the
     chief executive officer of Enterra shall have been delivered to
     Weatherford;

          (b)  Since the date of this Agreement, no Material Adverse Change of
     Enterra shall have occurred, and Weatherford shall have received a
     certificate of Enterra signed by the chief executive officer of Enterra
     dated the Closing Date to such effect;

          (c)  Weatherford shall have been advised in writing as of the date of
     this Agreement and as of the Closing Date (i) by Arthur Andersen LLP that,
     in accordance with generally accepted accounting principles and applicable
     rules and regulations of the Commission, Weatherford is eligible to be a
     party to a merger accounted for as a "pooling of interests" and that Arthur
     Andersen LLP is not aware of any matters that prohibit the use of "pooling
     of interests" accounting in connection with the Merger and (ii) by KPMG
     Peat Marwick LLP that, in accordance with generally accepted accounting
     principles and applicable rules and regulations of the Commission, no
     conditions exist that would preclude Weatherford's accounting for the
     Merger with Enterra as a "pooling of interests" as those conditions relate
     to Enterra;

          (d)  Enterra shall have received, and furnished written copies to
     Weatherford of, the Enterra affiliates' agreements pursuant to Section 4.3;

          (e)  Weatherford shall have received from Morgan, Lewis & Bockius,
     counsel to Enterra, an opinion dated the Effective Time covering the
     matters set forth in Exhibit 6.2(e);

          (f)  Weatherford shall have received a copy of the "comfort letter" of
     KPMG Peat Marwick LLP pursuant to Section 5.2(a) and on or prior to the
     Closing Date an additional letter from KPMG Peat Marwick LLP dated as of
     the Closing Date, in form and substance reasonably satisfactory to
     Weatherford, stating that nothing has come to their attention, as of a date
     no earlier than five days prior to the Closing Date, which would require
     any change in their letter delivered pursuant to Section 5.2(a) if it were
     required to be dated and delivered on the Closing Date;

          (g)  The Board of Directors of Weatherford shall have received from
     Merrill Lynch & Co. a written opinion, dated as of the date of this
     Agreement, in form and substance reasonably satisfactory to the Board of
     Directors of Weatherford, to the effect that the Conversion Rate is fair to
     the holders of Weatherford Common Stock from a financial point of view,
     which opinion shall have been confirmed in writing to such Board as of the
     date the Proxy Statement is first mailed to the stockholders of Weatherford
     and not subsequently withdrawn;

          (h)  Weatherford shall have received from Fulbright & Jaworski L.L.P.,
     counsel to Weatherford, a written opinion dated as of the date that the
     Proxy


                                      -39-

<PAGE>

     Statement is first mailed to stockholders of Weatherford to the effect that
     (i) the Merger will be treated for federal income tax purposes as a
     reorganization within the meaning of Section 368(a) of the Code, (ii)
     Weatherford and Enterra will each be a party to that reorganization within
     the meaning of Section 368(b) of the Code and (iii) Weatherford and Enterra
     shall not recognize any gain or loss as a result of the Merger, and such
     opinion shall not have been withdrawn or modified in any material respect;

          (i)  The Stockholders' Agreement among Enterra, First Reserve
     Corporation and the various First Reserve Funds shall have been in full
     force and effect, and the stockholders of Enterra named therein shall not
     be in breach of any of the material terms thereof, immediately prior to the
     Closing; and

          (j)  D. Dale Wood shall have entered into definitive arrangements
     reflecting the principal terms set forth in Exhibit 5.20.

     6.3  ADDITIONAL CONDITIONS TO OBLIGATIONS OF ENTERRA.  The obligation of
Enterra to effect the Merger is, at the option of Enterra, also subject to the
fulfillment or waiver at or prior to the Closing Date of the following
conditions:

          (a)  The representations and warranties of Weatherford contained in
     subsections (b), (c), (e) and (g) of Section 2.2 shall be accurate, and the
     representations and warranties of Weatherford contained in all other
     subsections of Section 2.2 shall be accurate in all material respects
     (except to the extent qualified by materiality, in which case such
     representations and warranties shall be accurate), as of the Closing Date
     as though such representations and warranties had been made at and as of
     that time (except where any such representation or warranty is made as of a
     date specifically set forth therein); all of the terms, covenants and
     conditions of this Agreement to be complied with and performed by
     Weatherford on or before the Closing Date shall have been duly complied
     with and performed in all material respects; and a certificate of
     Weatherford to the foregoing effect dated the Closing Date and signed by
     the chief executive officer of Weatherford shall have been delivered to
     Enterra;

          (b)  Since the date of this Agreement, no Material Adverse Change of
     Weatherford shall have occurred, and Enterra shall have received a
     certificate of Weatherford signed by the chief executive officer of
     Weatherford dated the Closing Date to such effect;

          (c)  Enterra shall have been advised in writing as of the date of this
     Agreement and as of the Closing Date (i) by Arthur Andersen LLP that, in
     accordance with generally accepted accounting principles and applicable
     rules and regulations of the Commission, Weatherford is eligible to be a
     party to a merger accounted for as a "pooling of interests" and that Arthur
     Andersen LLP is not aware of any matters that prohibit the use of "pooling
     of interests" accounting in connection with the Merger and (ii) by KPMG
     Peat Marwick LLP that, in accordance with generally accepted accounting
     principles and applicable rules and regulations of the Commission, no
     conditions exist that would preclude


                                      -40-

<PAGE>

     Weatherford's accounting for the Merger with Enterra as a "pooling of
     interests" as those conditions relate to Enterra;

          (d)  Weatherford shall have received, and furnished written copies to
     Enterra of, the Weatherford affiliates' agreements pursuant to Section 3.3;

          (e)  Enterra shall have received from Fulbright & Jaworski L.L.P.,
     counsel to Weatherford, an opinion dated the Effective Time covering the
     matters set forth in Exhibit 6.3(e);

          (f)  Enterra shall have received a copy of the "comfort letter" of
     Arthur Andersen LLP pursuant to Section 5.2(b) and on or prior to the
     Closing Date an additional letter from Arthur Andersen LLP dated as of the
     Closing Date, in form and substance reasonably satisfactory to Enterra,
     stating that nothing has come to their attention, as of a date no earlier
     than five days prior to the Closing Date, which would require any change in
     their letter delivered pursuant to Section 5.2(b) if it were required to be
     dated and delivered on the Closing Date;

          (g)  The Board of Directors of Enterra shall have received from
     Simmons & Company International, Inc. a written opinion, dated as of the
     date of this Agreement, in form and substance reasonably satisfactory to
     the Board of Directors of Enterra, to the effect that the consideration to
     be received by the holders of Enterra Common Stock in the Merger is fair
     from a financial point of view to such holders, which opinion shall have
     been confirmed in writing to such Board as of the date the Proxy Statement
     is first mailed to the stockholders of Enterra and not subsequently
     withdrawn;

          (h)  Enterra shall have received from Morgan, Lewis & Bockius, counsel
     to Enterra, a written opinion dated as of the date that the Proxy Statement
     is first mailed to stockholders of Enterra to the effect that (i) the
     Merger will be treated for federal income tax purposes as a reorganization
     within the meaning of Section 368(a) of the Code, (ii) Weatherford and
     Enterra will each be a party to that reorganization within the meaning of
     Section 368(b) of the Code and (iii) the stockholders of Enterra shall not
     recognize any gain or loss as a result of the Merger, other than to the
     extent such stockholders receive cash in lieu of fractional shares, and
     such opinion shall not have been withdrawn or modified in any material
     respect;

          (i)  The shares of Weatherford Common Stock to be issued upon
     consummation of the Merger shall have been approved for listing on the New
     York Stock Exchange, subject to official notice of issuance; and

          (j)  Each of the Weatherford Change of Control Agreements set forth on
     Exhibit 6.3(j)(i) shall be amended, pursuant to the form attached hereto as
     Exhibit 6.3(j)(ii).


                                      -41-

<PAGE>

                                   ARTICLE VII
                    SPECIAL PROVISIONS AS TO CERTAIN MATTERS

     7.1  NO SOLICITATION BY WEATHERFORD.

          (a)  Weatherford shall not, nor shall it permit any of its
     subsidiaries to, nor shall it authorize or permit any officer, director,
     employee, investment banker, attorney or other advisor, agent or
     representative of Weatherford or any of its subsidiaries to, directly or
     indirectly, (i) solicit, initiate or encourage the submission of any
     Weatherford Takeover Proposal (as hereinafter defined), (ii) enter into any
     agreement with respect to any Weatherford Takeover Proposal, or
     (iii) participate in any discussions or negotiations regarding, or furnish
     to any person any information with respect to, the making of any proposal
     that constitutes, or may reasonably be expected to lead to, any Weatherford
     Takeover Proposal; PROVIDED, HOWEVER, that prior to the vote of
     stockholders of Weatherford for approval and adoption of this Agreement and
     the Merger, Weatherford may take any actions described in the foregoing
     clause (iii) to the extent that the Board of Directors of Weatherford
     determines, in good faith after consultation with outside counsel, that
     failure to take such actions could reasonably be expected to result in a
     breach of the Board's fiduciary obligations.  Without limiting the
     foregoing, it is understood that any violation of the restrictions set
     forth in the preceding sentence by any officer, director or employee of
     Weatherford or any of the Weatherford Subsidiaries or any investment
     banker, attorney or other advisor, agent or representative of Weatherford,
     whether or not such person is purporting to act on behalf of Weatherford or
     otherwise, shall be deemed to be a material breach of this Agreement by
     Weatherford.  For purposes of this Agreement, a "Weatherford Takeover
     Proposal" means (i) any proposal or offer, other than a proposal or offer
     by Enterra or any of its affiliates, for a merger or other business
     combination involving Weatherford, (ii) any proposal or offer, other than a
     proposal or offer by Enterra or any of its affiliates, to acquire from
     Weatherford or any of its affiliates in any manner, directly or indirectly,
     more than 30% of the voting stock of Weatherford or any Weatherford
     Subsidiary or a material amount of the assets of Weatherford and the
     Weatherford Subsidiaries, taken as a whole, or (iii) any proposal or offer,
     other than a proposal or offer by Enterra or any of its affiliates, to
     acquire from the stockholders of Weatherford by tender offer, exchange
     offer or otherwise more than 30% of the outstanding voting stock of
     Weatherford.

          (b)  Neither the Board of Directors of Weatherford nor any committee
     thereof shall (i) withdraw or modify, or propose to withdraw or modify, in
     a manner adverse to Enterra the approval or recommendation by the Board of
     Directors of Weatherford or any such committee of this Agreement or the
     Merger or take any action having such effect or (ii) approve or recommend,
     or propose to approve or recommend, any Weatherford Takeover Proposal.
     Notwithstanding the foregoing, if the Board of Directors of Weatherford
     receives a Weatherford Takeover Proposal that, in the exercise of its
     fiduciary obligations (as determined in good faith after consultation with
     outside counsel), it


                                      -42-

<PAGE>

     determines to be a Weatherford Superior Proposal (as hereinafter defined),
     the Board of Directors of Weatherford may withdraw or modify its approval
     or recommendation of this Agreement or the Merger and may (subject to the
     following sentence) terminate this Agreement, in each case at any time
     after the fifth business day following Enterra's receipt of written notice
     (a "Weatherford Notice of Superior Proposal") advising Enterra that the
     Board of Directors of Weatherford has received a Weatherford Takeover
     Proposal that it has determined to be a Weatherford Superior Proposal,
     specifying the principal terms and conditions of such Weatherford Superior
     Proposal and identifying the person making such Weatherford Superior
     Proposal.  Weatherford may terminate this Agreement pursuant to the
     preceding sentence only if the stockholders of Weatherford shall not yet
     have voted upon the Merger and Weatherford shall have paid to Enterra the
     Termination Fee (as defined in Section 7.3(a)).  Nothing contained herein
     shall prohibit Weatherford from taking and disclosing to its stockholders a
     position contemplated by Rule 14e-2(a) of the Exchange Act provided that
     Weatherford does not withdraw or modify its position with respect to the
     Merger or take any action having such effect or approve or recommend a
     Weatherford Takeover Proposal.  For purposes of this Agreement, a
     "Weatherford Superior Proposal" means any bona fide Weatherford Takeover
     Proposal to merge with or acquire, directly or indirectly, all of the
     voting stock then outstanding or all or substantially all of the assets of
     Weatherford, and otherwise on terms that the Board of Directors of
     Weatherford determines in its good faith reasonable judgment (based on the
     written advice of a financial advisor of nationally recognized reputation)
     to be more favorable to Weatherford's stockholders than the Merger.

          (c)  If the Board of Directors of Weatherford or any committee thereof
     shall (i) withdraw or modify, or propose to withdraw or modify, in a manner
     adverse to Enterra the approval or recommendation by the Board of Directors
     of Weatherford or any such committee of this Agreement or the Merger or
     take any action having such effect or (ii) approve or recommend, or propose
     to approve or recommend, any Weatherford Takeover Proposal, Enterra may
     terminate this Agreement.

          (d)  In addition to the obligations of Weatherford set forth in
     Section 7.1(b), Weatherford shall promptly advise Enterra orally and in
     writing of any negotiations or discussions, entered into in reliance on the
     proviso to the first sentence of Section 7.1(a).

     7.2  NO SOLICITATION BY ENTERRA.

          (a)  Enterra shall not, nor shall it permit any of its subsidiaries
     to, nor shall it authorize or permit any officer, director, employee,
     investment banker, attorney or other advisor, agent or representative of
     Enterra or any of its subsidiaries to, directly or indirectly, (i) solicit,
     initiate or encourage the submission of any Enterra Takeover Proposal (as
     hereinafter defined), (ii) enter into any agreement with respect to any
     Enterra Takeover Proposal, or (iii) participate in any discussions or
     negotiations regarding, or furnish to any



                                      -43-

<PAGE>

     person any information with respect to, the making of any proposal that
     constitutes, or may reasonably be expected to lead to, any Enterra Takeover
     Proposal; PROVIDED, HOWEVER, that prior to the vote of stockholders of
     Enterra for approval and adoption of this Agreement and the Merger, Enterra
     may take any actions described in the foregoing clause (iii) to the extent
     that the Board of Directors of Enterra determines, in good faith after
     consultation with outside counsel, that failure to take such actions could
     reasonably be expected to result in a breach of the Board's fiduciary
     obligations.  Without limiting the foregoing, it is understood that any
     violation of the restrictions set forth in the preceding sentence by any
     officer, director or employee of Enterra or any of the Enterra Subsidiaries
     or any investment banker, attorney or other advisor, agent or
     representative of Enterra, whether or not such person is purporting to act
     on behalf of Enterra or otherwise, shall be deemed to be a material breach
     of this Agreement by Enterra.  For purposes of this Agreement, an "Enterra
     Takeover Proposal" means (i) any proposal or offer, other than a proposal
     or offer by Weatherford or any of its affiliates, for a merger or other
     business combination involving Enterra, (ii) any proposal or offer, other
     than a proposal or offer by Weatherford or any of its affiliates, to
     acquire from Enterra or any of its affiliates in any manner, directly or
     indirectly, more than 30% of the voting stock of Enterra or any Enterra
     Subsidiary or a material amount of the assets of Enterra and the Enterra
     Subsidiaries, taken as a whole, or (iii) any proposal or offer, other than
     a proposal or offer by Weatherford or any of its affiliates, to acquire
     from the stockholders of Enterra by tender offer, exchange offer or
     otherwise more than 30% of the outstanding voting stock of Enterra.

          (b)  Neither the Board of Directors of Enterra nor any committee
     thereof shall (i) withdraw or modify, or propose to withdraw or modify, in
     a manner adverse to Weatherford the approval or recommendation by the Board
     of Directors of Enterra or any such committee of this Agreement or the
     Merger or take any action having such effect or (ii) approve or recommend,
     or propose to approve or recommend, any Enterra Takeover Proposal.
     Notwithstanding the foregoing, if the Board of Directors of Enterra
     receives an Enterra Takeover Proposal that, in the exercise of its
     fiduciary obligations (as determined in good faith after consultation with
     outside counsel), it determines to be an Enterra Superior Proposal (as
     hereinafter defined), the Board of Directors of Enterra may withdraw or
     modify its approval or recommendation of this Agreement or the Merger and
     may (subject to the following sentence) terminate this Agreement, in each
     case at any time after the fifth business day following Weatherford's
     receipt of written notice (an "Enterra Notice of Superior Proposal")
     advising Weatherford that the Board of Directors of Enterra has received an
     Enterra Takeover Proposal that it has determined to be an Enterra Superior
     Proposal, specifying the principal terms and conditions of such Enterra
     Superior Proposal and identifying the person making such Enterra Superior
     Proposal.  Enterra may terminate this Agreement pursuant to the preceding
     sentence only if the stockholders of Enterra shall not yet have voted upon
     the Merger and Enterra shall have paid to Weatherford the Termination Fee.
     Nothing contained herein shall prohibit Enterra from taking and disclosing
     to its stockholders a position contemplated by Rule 14e-2(a) of the
     Exchange Act


                                      -44-

<PAGE>

     provided that Enterra does not withdraw or modify its position with respect
     to the Merger or take any action having such effect or approve or recommend
     an Enterra Takeover Proposal.  For purposes of this Agreement, an "Enterra
     Superior Proposal" means any bona fide Enterra Takeover Proposal to merge
     with or acquire, directly or indirectly, all of the voting stock then
     outstanding or all or substantially all of the assets of Enterra, and
     otherwise on terms that the Board of Directors of Enterra determines in its
     good faith reasonable judgment (based on the written advice of a financial
     advisor of nationally recognized reputation) to be more favorable to
     Enterra's stockholders than the Merger.

          (c)  If the Board of Directors of Enterra or any committee thereof
     shall (i) withdraw or modify, or propose to withdraw or modify, in a manner
     adverse to Weatherford the approval or recommendation by the Board of
     Directors of Enterra or any such committee of this Agreement or the Merger
     or take any action having such effect or (ii) approve or recommend, or
     propose to approve or recommend, any Enterra Takeover Proposal, Weatherford
     may terminate this Agreement.

          (d)  In addition to the obligations of Enterra set forth in
     Section 7.2(b), Enterra shall promptly advise Weatherford orally and in
     writing of any negotiations or discussions, entered into in reliance on the
     proviso to the first sentence of Section 7.2(a).

     7.3  FEE AND EXPENSE REIMBURSEMENTS.

          (a)  Weatherford agrees to pay Enterra a fee in immediately available
     funds of $20,000,000 (the "Termination Fee") promptly upon the termination
     of this Agreement if this Agreement is terminated by Enterra or Weatherford
     pursuant to  Section 8.1(j).  Further, Weatherford agrees to pay Enterra
     the Termination Fee if:

               (i)    this Agreement is terminated for any reason other than a
          material breach by Enterra and, after the date hereof and before such
          termination, a Weatherford Takeover Proposal shall have been made and
          the stockholders of Weatherford shall not have approved the Merger; or

               (ii)   Weatherford shall have terminated this Agreement pursuant
          to Section 8.1(c) or Section 8.1(h) and, within six months after such
          termination, Weatherford shall have entered into a definitive
          agreement with any person (other than Enterra or any of its
          affiliates) with respect to a Weatherford Takeover Proposal than is
          more favorable to Weatherford's stockholders that the Merger.

     The Termination Fee shall be payable promptly upon termination of this
     Agreement if any of the events described in Section 7.3(a)(i) shall have
     occurred prior to termination.  The Termination Fee payable pursuant to
     Section 7.3(a)(ii) shall be payable promptly upon the first occurrence of
     the event following termination of this Agreement.


                                      -45-

<PAGE>

          (b)  Enterra agrees to pay Weatherford the Termination Fee promptly
     upon the termination of this Agreement if this Agreement is terminated by
     Enterra or Weatherford pursuant to Section 8.1(k).  Further, Enterra agrees
     to pay Weatherford the Termination Fee if:

               (i)    this Agreement is terminated for any reason other than a
          material breach by Weatherford and, after the date hereof and before
          such termination, an Enterra Takeover Proposal shall have been made
          and the stockholders of Enterra shall not have approved the Merger; or

               (ii)   Enterra shall have terminated this Agreement pursuant to
          Section 8.1(d) or Section 8.1(i) and, within six months after such
          termination, Enterra shall have entered into a definitive agreement
          with any person (other than Weatherford or any of its affiliates) with
          respect to an Enterra Takeover Proposal that is more favorable to
          Enterra's stockholders than the Merger.

     The Termination Fee shall be payable promptly upon termination of this
     Agreement if any of the events described in Section 7.3(b)(i) shall have
     occurred prior to termination.  The Termination Fee payable pursuant to
     Section 7.3(b)(ii) shall be payable promptly upon the first occurrence of
     the event following termination of this Agreement.

                                  ARTICLE VIII
                                  MISCELLANEOUS

     8.1  TERMINATION.  This Agreement may be terminated and the Merger and the
other transactions contemplated herein may be abandoned at any time prior to the
Effective Time, whether prior to or after approval by the stockholders of
Weatherford or the stockholders of Enterra:

          (a)  by mutual consent of Weatherford and Enterra;

          (b)  by either Weatherford or Enterra if the Merger has not been
     effected on or before December 31, 1995;

          (c)  by Weatherford if the condition set forth in Section 6.2(g) is
     not satisfied;

          (d)  by Enterra if the condition set forth in Section 6.3(g) is not
     satisfied;

          (e)  by Weatherford if a final, unappealable order shall have been
     entered to restrain, enjoin or otherwise prevent, or awarding substantial
     damages in connection with, a consummation of this Agreement or the
     transactions contemplated in connection herewith, or there is pending by
     any governmental body any suit challenging or seeking to restrain or
     prohibit the consummation of the Merger or any of the other transactions
     contemplated by


                                      -46-

<PAGE>

     this Agreement or seeking to obtain from Enterra or any of the Enterra
     Subsidiaries any damages that are material in relation to Enterra and the
     Enterra Subsidiaries, taken as a whole;

          (f)  by Enterra if a final, unappealable order shall have been entered
     to restrain, enjoin or otherwise prevent, or awarding substantial damages
     in connection with, a consummation of this Agreement or the transactions
     contemplated in connection herewith, or there is pending by any
     governmental body any suit challenging or seeking to restrain or prohibit
     the consummation of the Merger or any of the other transactions
     contemplated by this Agreement or seeking to obtain from Weatherford or any
     of the Weatherford Subsidiaries any damages that are material in relation
     to Weatherford and the Weatherford Subsidiaries, taken as a whole;

          (g)  by either Weatherford or Enterra if the required approval of the
     stockholders of Enterra or the stockholders of Weatherford for the adoption
     and approval of the Merger and this Agreement is not received at their
     respective stockholders' meetings;

          (h)  by Weatherford if (i) since the date of this Agreement there has
     been a Material Adverse Change in Enterra or (ii) there has been a breach
     of any representation or warranty set forth in subsection (b), (c), (e) or
     (g) of Section 2.3, or there has been a breach of any other subsection of
     Section 2.3 in any material respect (except to the extent qualified by
     materiality, in which case such representations and warranties shall not
     have been breached in any respect), by Enterra or Enterra fails to perform
     in any material respect any of its covenants, agreements or obligations
     under this Agreement;


          (i)  by Enterra if (i) since the date of this Agreement there has been
     a Material Adverse Change in Weatherford or (ii) there has been a breach of
     any representation or warranty set forth in subsection (b), (c), (e) or (g)
     of Section 2.2, or there has been a breach of any other subsection of
     Section 2.2 in any material respect (except to the extent qualified by
     materiality, in which case such representations and warranties shall not
     have been breached in any respect), by Weatherford or Weatherford fails to
     perform in any material respect any of its covenants, agreements or
     obligations under this Agreement;

          (j)  by Weatherford or Enterra to the extent permitted under
     Section 7.1; or

          (k)  by Weatherford or Enterra to the extent permitted under
     Section 7.2.

     8.2  EFFECT OF TERMINATION.  In the event of any termination of this
Agreement pursuant to Section 8.1, Weatherford and Enterra shall have no
obligation or liability to each other except that (i) the provisions of
Sections 5.8 and 7.3, this Article VIII and the obligations set forth in the
Confidentiality Agreement dated May 12, 1995, between Weatherford and Enterra
(the "Confidentiality Agreement") shall survive any such


                                      -47-

<PAGE>

termination, and (ii) in the case of termination pursuant to Section 8.1(h) or
8.1(i) only, nothing herein and no termination pursuant to such sections will
relieve any party from liability for any breach of this Agreement.

     8.3  WAIVER AND AMENDMENT.  Any provision of this Agreement may be waived
at any time by the party that is, or whose stockholders are, entitled to the
benefits thereof.  This Agreement may not be amended or supplemented at any
time, except by an instrument in writing signed on behalf of each party hereto;
PROVIDED that after this Agreement has been approved and adopted by the
stockholders of Weatherford and the stockholders of Enterra, this Agreement may
be amended only as may be permitted by applicable provisions of the DGCL.  The
waiver by any party hereto of any condition or of a breach of another provision
of this Agreement shall not operate or be construed as a waiver of any other
condition or subsequent breach.  The waiver by any party hereto of any of the
conditions precedent to its obligations under this Agreement shall not preclude
it from seeking redress for breach of this Agreement other than with respect to
the condition so waived.

     8.4  NONSURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
AGREEMENTS.  None of the  representations, warranties, covenants or agreements
in this Agreement or in any instrument delivered pursuant to this Agreement
shall survive the Effective Time, except for the terms of Article I,
Sections 5.4, 5.7, 5.8, 5.9, 5.10, 5.12, 5.13, 5.18, 5.19(b) and 5.22, this
Article VIII and the agreements of the "affiliates" of Enterra and Weatherford
delivered pursuant to Section 6.2(d) and Section 6.3(d), respectively.

     8.5  PUBLIC STATEMENTS.  Enterra and Weatherford agree to consult with each
other prior to issuing any press release or otherwise making any public
statement with respect to the transactions contemplated hereby, and shall not
issue any such press release or make any such public statement prior to such
consultation, except as may be required by law or applicable stock exchange
policy.

     8.6  BINDING EFFECT; ASSIGNMENT.  This Agreement shall inure to the benefit
of and will be binding upon the parties hereto and their respective legal
representatives, successors and permitted assigns.  This Agreement shall not be
assignable by the parties hereto.

     8.7  NOTICES.  All notices, requests, demands, claims and other
communications that are required to be or may be given under this Agreement
shall be in writing and shall be deemed to have been duly given if (a) delivered
in person or by courier, (b) sent by facsimile transmission, answer back
requested, or (c) mailed, certified first class mail, postage prepaid, return
receipt requested, to the parties hereto at the following addresses:


                                      -48-

<PAGE>

     if to Enterra:              Enterra Corporation
                                 13100 Northwest Freeway, Sixth Floor
                                 Houston, Texas 77040
                                 Attention:  D. Dale Wood, Chairman of the
                                    Board, President and Chief Executive
                                    Officer
                                 Fax:  (713) 462-7816

     with a required copy to:    Morgan, Lewis & Bockius
                                 2000 One Logan Square
                                 Philadelphia, Pennsylvania  19103-6993
                                 Attention:  David R. King
                                 Fax:  (215) 963-5299

     if to Weatherford:          Weatherford International Incorporated
                                 1360 Post Oak Boulevard, Suite 1000
                                 Houston, Texas 77056-3098
                                 Attention:  Philip Burguieres, Chairman of
                                    the Board, President and Chief Executive
                                    Officer
                                 Fax:  (713) 439-1152

     with a required copy to:    Fulbright & Jaworski L.L.P.
                                 1301 McKinney, Suite 5100
                                 Houston, Texas 77010-3095
                                 Attention:  Charles L. Strauss
                                 Fax:  (713) 651-5246

or to such other address or facsimile number as any party shall have furnished
to the other by notice given in accordance with this Section 8.7.  Such notices
shall be effective, (i) if delivered in person or by courier, upon actual
receipt by the intended recipient, (ii) if sent by facsimile transmission, when
the answer back is received, or (iii) if mailed, upon the earlier of five days
after deposit in the mail and the date of delivery as shown by the return
receipt therefor.

     8.8  GOVERNING LAW; JURISDICTION.  THIS AGREEMENT, THE SUBJECT MATTER
HEREOF AND ALL OF THE TRANSACTIONS CONTEMPLATED HEREBY SHALL BE GOVERNED IN ALL
RESPECTS, INCLUDING, WITHOUT LIMITATION, VALIDITY, INTERPRETATION AND EFFECT, BY
THE LAWS OF THE STATE OF DELAWARE.  EACH PARTY HERETO IRREVOCABLY SUBMITS TO THE
EXCLUSIVE JURISDICTION OF ANY COURT OF COMPETENT JURISDICTION IN THE STATE OF
DELAWARE AND THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE, AND
ANY OTHER COURT OF THE STATE OF DELAWARE AND THE UNITED STATES WITH JURISDICTION
TO HEAR APPEALS FROM ANY SUCH COURT, FOR THE PURPOSES OF ANY SUIT, ACTION OR
OTHER PROCEEDING OF ANY TYPE WHATSOEVER ARISING OUT OF THIS AGREEMENT OR THE
SUBJECT MATTER HEREOF OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREBY


                                      -49-

<PAGE>

BROUGHT BY ANY PARTY, AND TO THE EXTENT PERMITTED BY APPLICABLE LAW, HEREBY
WAIVES, AND AGREES NOT TO ASSERT, BY WAY OF MOTION, AS A DEFENSE, OR OTHERWISE,
IN ANY SUCH SUIT, ACTION OR PROCEEDING ANY CLAIM THAT SUCH PARTY IS NOT
PERSONALLY SUBJECT TO THE JURISDICTION OF THE ABOVE-NAMED COURTS, THAT THE SUIT,
ACTION OR PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM, THAT THE VENUE OF THE
SUIT, ACTION OR PROCEEDING IS IMPROPER OR THAT THIS AGREEMENT, OR THE SUBJECT
MATTER HEREOF MAY NOT BE ENFORCED IN OR BY SUCH COURT.  EACH PARTY HERETO
FURTHER AGREES NOT TO BRING OR PURSUE ANY SUCH SUIT, ACTION OF OTHER PROCEEDING
IN ANY OTHER COURTS OR JURISDICTION.

     8.9  SEVERABILITY.  If any term, provision, covenant or restriction of this
Agreement is held by a court of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall continue in full force and effect and shall
in no way be affected, impaired or invalidated.

     8.10 COUNTERPARTS.  This Agreement may be executed in counterparts, each of
which shall be an original, but all of which together shall constitute one and
the same agreement.

     8.11 HEADINGS.  The Section headings herein are for convenience only and
shall not affect the construction hereof.

     8.12 ENTIRE AGREEMENT; THIRD PARTY BENEFICIARIES.  This Agreement, the
exhibits attached hereto, the Weatherford Disclosure Letter (and Schedule 2.2(n)
thereto), the Enterra Disclosure Letter (and the exhibits attached thereto) and
the Confidentiality Agreement constitute the entire agreement and supersedes all
other prior agreements and understandings, both oral and written, among the
parties or any of them, with respect to the subject matter hereof and neither
this nor any documents delivered in connection with this Agreement confers upon
any person not a party hereto any rights or remedies hereunder except as
provided in Sections 5.9, 5.12, 5.13, 5.18 and 5.19(b).


                                      -50-

<PAGE>

     IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.

                                 WEATHERFORD INTERNATIONAL INCORPORATED



                                 By:         /s/ Philip Burguieres
                                    -------------------------------------------
                                               Philip Burguieres
                                      Chairman of the Board, President and
                                            Chief Executive Officer


                                 ENTERRA CORPORATION



                                 By:           /s/ D. Dale Wood
                                    -------------------------------------------
                                                 D. Dale Wood
                                       Chairman of the Board, President and
                                            Chief Executive Officer


                                      -51-

<PAGE>
                           CONSENT AND FIRST AMENDMENT
                               TO CREDIT AGREEMENT


          CONSENT AND FIRST AMENDMENT TO CREDIT AGREEMENT (this "Amendment"),
executed and delivered on or about December 2, 1994, but effective as of April
15, 1994, made by and among Credit Lyonnais New York Branch, individually and as
Administrative Agent (the "Administrative Agent"), Texas Commerce Bank National
Association, a national banking association and its successors and assigns, as
Collateral Agent (the "Collateral Agent"), Arab Banking Corporation (B.S.C.),
individually and as a Co-Agent (together with the Collateral Agent and the
Administrative Agent, being hereinafter collectively referred to as the
"Agents"), and the banks and other financial institutions listed on the
signature pages hereto (together with the Agents hereinafter collectively
referred to as the "Banks"), Weatherford International Incorporated, a
corporation organized under the laws of the State of Delaware ("WII"),
Weatherford U.S., Inc., a corporation organized under the laws of the State of
Delaware ("WUSI"), and Weatherford/Lamb, Inc., a corporation organized under the
laws of the State of Delaware ("Weatherford/Lamb").

          PRELIMINARY STATEMENTS:

          (1)  The parties hereto are parties to that certain Amended and
Restated Revolving and Term Credit Agreement dated as of April 15, 1994 among
the Agents, the Banks, WII, WUSI and Weatherford/Lamb (WUSI and Weatherford/Lamb
being hereinafter collectively referred to as the "Borrowers") (as hereinafter
amended or otherwise modified from time to time, the "Credit Agreement").

          (2)  WII and the Borrowers have requested that the Banks agree to
certain modifications to the Credit Agreement pursuant to the terms and
conditions hereof.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants contained herein and for other good and valuable consideration, the
adequacy, receipt and sufficiency of which are hereby acknowledged, the parties
hereto hereby agree as follows:

          SECTION 1.  DEFINED TERMS AND RELATED MATTERS.

          (a)  The capitalized terms used herein which are defined in the Credit
     Agreement and not otherwise defined herein shall have the meanings
     specified therein.

          (b)  The words "hereof", "herein" and "hereunder" and words of similar
     import when used in this Amendment shall refer to this Amendment as a whole
     and not to any particular provision of this Amendment.

                                       -1-

<PAGE>

          SECTION 2.  AMENDMENTS TO CREDIT AGREEMENT.  The Credit Agreement is
hereby amended as follows:

          (a)  Clause (ii) of Section 6 of the Credit Agreement is hereby
     amended in its entirety to read as follows:

          (ii) the proceeds of the Term Loans shall be used by WUSI to
          renew, extend and restructure the term loan facility made
          available to WUSI under the Existing Facility, to finance (by
          means of intercompany loans made ultimately to the Odfjell Buyers
          evidenced by the Odfjell Acquisition Subsidiary Notes) the
          Odfjell Acquisition, to pay transaction costs associated with the
          Odfjell Acquisition and to fully repay the amount outstanding as
          of the Closing Date under the revolving credit facility under the
          Existing Facility.

          (b)  Section 9.18 of the Credit Agreement is hereby amended in its
     entirety to read as follows:

                    9.18.     ACQUISITION SUBSIDIARY NOTES.  WII will,
          and will cause WUSI, WLI and each Acquisition Subsidiary to,
          maintain in full force and effect all Acquisition Subsidiary
          Notes and will not, except as contemplated by the First
          Amendment, without the prior written consent of the Banks,
          modify or amend any Acquisition Subsidiary Note.  WII will,
          and will cause WUSI, WLI and each Acquisition Subsidiary to,
          perform or cause to be performed all of the terms,
          covenants, agreements and conditions on its part to be
          performed under each Acquisition Subsidiary Note to which it
          is a party.  WII will, and will cause WUSI, WLI and each
          Acquisition Subsidiary to, timely and diligently pursue the
          enforcement of each covenant or obligation of each other
          party to each Acquisition Subsidiary Note.  As soon as
          possible after the Closing Date, WLI will propose revised
          principal amounts for each Odfjell Acquisition Note, such
          amounts to reflect the fair market value of the Odfjell
          Acquisition Assets purchased by each Odfjell Buyer.  Upon
          the prior written consent of the Agents, the Odfjell
          Acquisition Subsidiary Notes shall be amended and restated
          to reflect such revised amounts.

          (c)  Section 10.3 of the Credit Agreement is hereby amended by
     amending Subsection (1) thereof in its entirety to read as follows:

          (1)  (A) unsecured Debt of the Acquisition Subsidiaries to
          WUSI and WLI represented by the Acquisition Subsidiary Notes
          and
                                       -2-
<PAGE>

          (B) unsecured Debt of WLI to WUSI evidenced by that certain Promissory
          Note dated as of April 15, 1994, executed by WLI and payable to WUSI
          in the original, stated principal amount of $55,200,000;

          (d)  Section 10.3 of the Credit Agreement is hereby further amended by
     including after subsection (o) thereof the following new subsection (p):

          (p)  unsecured Debt of WII or any Borrower of the type
          described in subsection (d)(iii) of the definition of
          "Debt."

          (e)  Section 10.3 of the Credit Agreement is hereby further amended by
     amending the final paragraph thereof to read as follows:

                    Notwithstanding the foregoing, no Debt permitted
          under subclauses (b) through (p) shall be incurred, created
          or assumed unless prior to such incurrence, creation or
          assumption and after giving pro forma effect thereto, no
          Default or Event of Default has or will have occurred and be
          continuing.

          (f)  The first sentence of Section 10.5 of the Credit Agreement is
     hereby amended in its entirety to read as follows:

          Except as contemplated by the First Amendment, WII will not, and
          will not permit any Subsidiary to, sell or otherwise dispose of
          any shares of stock or Debt of any Subsidiary, or permit any
          Subsidiary to issue or dispose of its stock (other than
          directors' qualifying shares), except as provided by
          Section 10.6.

          (g)  Exhibit "A" to the Credit Agreement is hereby amended by amending
     the definition of "Odfjell Acquisition Subsidiary Notes" in its entirety to
     read as follows:

                    "ODFJELL ACQUISITION SUBSIDIARY NOTES" shall mean
          the promissory notes executed by the Odfjell Buyers and
          payable to WLI to evidence the purchase price of the Odfjell
          Acquisition Assets, each in the form of the promissory note
          attached as EXHIBIT K hereto, or other form reasonably
          acceptable to the Agents and, upon prior written consent of
          the Agents, any renewals, extensions, modifications or
          rearrangements thereof.

          (h)  Exhibit "A" to the Credit Agreement is hereby further amended by
     including therein in proper alphabetical order the following new
     definition:

                                       -3-

<PAGE>

                    "ASSIGNMENT OF ODFJELL ACQUISITION SUBSIDIARY
          NOTES" shall mean that certain Assignment of Odfjell
          Acquisition Subsidiary Notes dated as of April 15, 1994
          executed by WLI in favor of the Collateral Agent, and, upon
          prior written consent of the Agents, any renewals,
          extensions, modifications or rearrangements thereof.

          (i)  Exhibit "A" to the Credit Agreement is hereby further amended by
     including therein in proper alphabetical order the following new
     definition:

          "FIRST AMENDMENT" shall mean that certain Consent and First
          Amendment to Credit Agreement dated as of April 15, 1994,
          executed by and among WII, the Borrowers, the Agents and the
          Banks."

          (j)  Exhibit "A" to the Credit Agreement is hereby further amended by
     including therein in proper alphabetical order the following new
     definition:

          "G & W ACQUISITION" shall mean the purchase on or about June 1,
          1994 by Weatherford Inc. and Weatherford Oil Tool Middle East
          Ltd. of the assets of Gillette & Whitehead Drilling Services Ltd.
          for a purchase price of approximately $8,700,000.00.

          (k)  Exhibit "A" to the Credit Agreement is hereby further amended by
     amending the definition of "Security Agreements" in its entirety to read as
     follows:

          "SECURITY AGREEMENTS" shall mean, collectively, the WUSI Security
          Agreement, the WLI Security Agreement and the Assignment of
          Odfjell Acquisition Subsidiary Notes.

          (l)  Exhibit "A" to the Credit Agreement is hereby further amended so
     that clause (ii) of the proviso contained in the definition of
     "Consolidated Capital Expenditures" is amended to read in its entirety as
     follows:

          (ii) any capital expenditures of WWII and its Subsidiaries
          incurred (A) in connection with the G & W Acquisition or (B)
          prior to the Closing Date in connection with the Prior
          Acquisitions or

          (m)  Exhibit "K" to the Credit Agreement is hereby replaced by
     Exhibit "K" attached hereto.

          SECTION 3.  CERTAIN CONSENTS OF THE AGENTS AND THE BANKS.
Notwithstanding prohibitions contained in Sections 10.5 and 10.6 and the second
sentence of Section 9.8 of the Credit Agreement, each of the Agents and the
Banks, by its execution and delivery of this

                                       -4-

<PAGE>

Amendment, provides its written consent to the transactions that are described
in SCHEDULE 1 to this Amendment; PROVIDED, THAT, no Default or Event of Default
which may arise from any such transaction due to a violation of any other
provision of the Credit Agreement is hereby waived.

          SECTION 4.  REPRESENTATIONS AND WARRANTIES.  WII and each Borrower
represent and warrant as follows:

          (a)  This Amendment is, and all other documents and instruments
     executed in connection herewith will be, legal, valid and binding
     obligations of WII and each Subsidiary which is a party thereto enforceable
     in accordance with their respective terms, except as enforceability may be
     (i) limited by applicable Debtor Laws and (ii) subject to the general
     effect of general principles of equity (regardless of whether such
     enforceability is considered in a proceeding is equity or at law).

          (b)  No authorization, approval or other action by, and no notice to
     or filing with, any governmental authority which has not been received is
     required for (i) the execution, delivery or performance of this Amendment
     by WII and the Borrowers; or (ii) the exercise by the Agents and the Banks
     of the rights or the remedies provided for in the Credit Agreement, as
     amended hereby.

          (c)  WII and each Subsidiary (a) are corporations duly organized,
     validly existing, and in good standing under the laws of their respective
     jurisdiction of incorporation; (b) have the corporate power to own their
     respective properties and to carry on their respective businesses as now
     conducted; and (c) are duly qualified as foreign corporations to do
     business and are in good standing in every jurisdiction where such
     qualification is necessary and where failure to be so qualified would have
     a Material Adverse Effect.

          (d)  Neither the execution and delivery of this Amendment and all
     other documents and instruments executed in connection herewith nor the
     consummation of the transactions contemplated hereby or thereby nor
     fulfillment of and compliance with the respective terms, conditions and
     provisions hereof and thereof will conflict with or result in a breach of
     any of the terms, conditions or provisions of, or constitute a default
     under, or result in any violation of, or result in the creation or
     imposition of any Lien on any of the property of WII or any Subsidiary
     pursuant to (a) the charter or bylaws applicable to WII or any such
     Subsidiary; (b) any Law or any regulation of any administrative or
     governmental instrumentality; (c) any order, writ, injunction or decree of
     any court; or (d) the terms, conditions or provisions of any Material
     Contract to which WII or any such Subsidiary is a party or by which it is
     bound or to which it is subject.

          (e)  WII and each Subsidiary have the power and authority to make,
     execute, deliver and carry out this Amendment and all other documents and
     instruments executed in connection to which they are a party and the
     transactions contemplated herein and

                                       -5-

<PAGE>

therein and to perform their respective obligations hereunder and thereunder and
all such action has been duly authorized by all necessary proceedings on their
part.  Such Loan Documents to which they are a party have been duly and validly
executed and delivered by WII and each Subsidiary.

          (f)  Neither this Amendment nor any other document, certificate or
     statement furnished to any Agent or any Bank by or on behalf of WII or any
     Subsidiary in connection with this Amendment contains any untrue statement
     of a material fact or omits to state a material fact necessary in order to
     make the statements contained herein and therein not misleading.

          SECTION 5.  RATIFICATION.  The Credit Agreement, as hereby amended, is
in all respects ratified and confirmed, and all of the rights and powers created
thereby or thereunder shall be and remain in full force and effect.  The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein, operate as a waiver of any right, power or remedy of
the Agents or the Banks under the Credit Agreement, the Notes and the Loan
Documents, as each may be amended or modified from time to time, nor constitute
a waiver of any other provision of the Credit Agreement, as amended by this
Amendment or the Notes and the Loan Documents, as each may be amended or
modified from time to time.  This Amendment is a "Loan Document."

          SECTION 6.  FURTHER ASSURANCES.  WII and the Borrowers agree to do,
execute, acknowledge and deliver all and every further acts and instruments as
the Administrative Agent may request for the better assuring and confirming unto
the Administrative Agent all and singular the rights granted or intended to be
granted hereby or hereunder.

          SECTION 7.  EXECUTION IN COUNTERPARTS.  This Amendment may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.

          SECTION 8.  SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  All
representations and warranties contained in this Amendment or made in writing by
or on behalf of WII and the Borrowers in connection herewith, shall survive the
execution and delivery of this Agreement and shall continue until 365 or 366
days, as the case may be, after the repayment of the Notes.  Any investigation
by any Agent or any Bank shall not diminish in any respect whatsoever its right
to rely on such representations and warranties.

          SECTION 9.  GOVERNING LAW.  THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, EXCEPT TO THE
EXTENT THAT THE VALIDITY OR PERFECTION OF THE SECURITY INTEREST HEREUNDER, OR
REMEDIES

                                       -6-

<PAGE>

HEREUNDER, IN RESPECT OF ANY PLEDGED COLLATERAL ARE GOVERNED BY THE LAWS OF A
JURISDICTION OTHER THAN THE STATE OF NEW YORK.

          SECTION 10.  FINAL AGREEMENT.  THIS AMENDMENT AND ALL OTHER LOAN
DOCUMENTS (AS DEFINED IN THE CREDIT AGREEMENT) EXECUTED BY ANY OF THE PARTIES
PRIOR TO OR SUBSTANTIALLY CONCURRENTLY HEREWITH TOGETHER CONSTITUTES A WRITTEN
AGREEMENT WHICH REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT
BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN AGREEMENTS BETWEEN THE
PARTIES.  THIS PROVISION IS INTENDED TO COMPLY WITH SECTION 26.02 OF THE TEXAS
BUSINESS AND COMMERCE CODE.

                              WEATHERFORD INTERNATIONAL
                              INCORPORATED



                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              WEATHERFORD/LAMB, INC.



                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              WEATHERFORD U.S., INC.



                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                                       -7-

<PAGE>

                              CREDIT LYONNAIS NEW YORK BRANCH,
                              as a Bank and as Administrative Agent


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              TEXAS COMMERCE BANK NATIONAL
                              ASSOCIATION, as a Bank and as Syndication
                              and Collateral Agent


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              ARAB BANKING CORPORATION (B.S.C.),
                              as a Bank and as a Co-Agent


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              BANK OF SCOTLAND


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              CORESTATES BANK, N.A.


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                                       -8-

<PAGE>

                              FIRST INTERSTATE BANK OF TEXAS, N.A.


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              WELLS FARGO BANK


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              UNION BANK


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                              DEN NORSKE BANK AS


                              By:

                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                                       -9-

<PAGE>

                              BANQUE PARIBAS


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------


                              By:
                                 --------------------------------------------
                              Name:
                                   ------------------------------------------
                              Title:
                                    -----------------------------------------

                                      -10-

<PAGE>

                                   SCHEDULE 1


The transactions that have occurred are as follows:

1.   On June 16, 1994, Klepo-Stabylia S.A., a subsidiary directly owned by
     Weatherford International Incorporated ("Weatherford"), changed its name to
     Weatherford France, S.A. ("W/France") without giving prior written notice
     to the Agents.

2.   On July 15, 1994, Weatherford Oil Tool GmbH, a Borrowing Subsidiary, sold
     the assets of its French branch to Rig Services SARL, an Immaterial
     Subsidiary ("Rig Services"), for approximately U.S. $380,000.  The
     transaction was effective January 1, 1994 for accounting purposes.

3.   On July 20, 1994, Rig Services was merged into W/France.  The transaction
     was effective May 1, 1994 for accounting purposes.

4.   On July 8, 1994, Weatherford/Lamb, Inc., a Borrower and a subsidiary owned
     directly by Weatherford ("W/Lamb"), transferred its stock ownership of Bit
     & Tool A-1 Srl, a Borrowing Subsidiary ("A-1 Italy"), to Weatherford
     Mediterranea S.p.A. ("WEMESPA"), by virtue of not subscribing to A-1
     Italy's 1993 losses and allowing WEMESPA to do so.

Pending transactions include the following:

5.   The merger of Weatherford Marine, Inc., a Material Subsidiary, into
     Weatherford U.S., Inc., a Borrower, Material Subsidiary and subsidiary
     directly owned by Weatherford ("WUSI").  This merger will occur when the
     termination of the Seastrom joint venture with a third party is finalized,
     which will occur as soon as possible.

6.   The merger of Bit & Tool A-1 Srl. into WEMESPA.  This merger will occur
     after January 1, 1995 and will result in all Italian operations being in
     WEMESPA.

7.   The sale by W/France of its elastomer division business to WUSI and
     Weatherford Oil Tool Nederland B.V., a Borrowing Subsidiary ("W/Holland")
     for approximately $1,300,000 ($260,000 and $1,040,000).  This will be
     finalized as soon as possible and will be effective October 1, 1994.

8.   The merger of A-1 Bit & Tool Co. B.V., an Immaterial Subsidiary ("A-1
     Holland"), into W/Holland.

9.   In addition, there is planned a merger of Weatherford Norge AS, an
     Immaterial Subsidiary ("W/Norge"), into Weatherford Eurasia AS, an
     Immaterial Subsidiary.  While consent is not required for an Immaterial
     Subsidiary to merge into an Immaterial Subsidiary, W/Norge is an obligor
     under an Odfjell Acquisition Subsidiary Note.

                                      -11-


<PAGE>

              CONSENT AND SECOND AMENDMENT TO AMENDED AND RESTATED
                        REVOLVING AND TERM LOAN AGREEMENT


          This CONSENT AND SECOND AMENDMENT TO AMENDED AND RESTATED REVOLVING
AND TERM LOAN AGREEMENT (this "Amendment") dated effective as of December 31,
1994 by and among Weatherford International Incorporated, a corporation
organized under the laws of Delaware ("WII"), Weatherford U.S., Inc., a
corporation organized under the laws of Delaware ("WUSI"), and Weatherford/
Lamb, Inc., a corporation organized under the laws of Delaware ("WLI")
(collectively, the "Borrowers" and individually a "Borrower"), the financial
institutions listed on the signature pages hereof (collectively, the "Banks" and
individually, a "Bank"), Credit Lyonnais New York Branch ("CL") in its capacity
as administrative agent (the "Administrative Agent") for the Banks hereunder,
Texas Commerce Bank National Association ("TCB") in its capacity as syndication
and collateral agent (the "Collateral Agent") for the Banks hereunder, and Arab
Banking Corporation (B.S.C.) ("ABC") in its capacity as a co-agent (the
"Co-Agent") for the Banks hereunder, (together with the Administrative Agent and
the Collateral Agent, being hereinafter collectively referred to as the "Agents"
and each individually in its capacity as an agent, an "Agent").

                             PRELIMINARY STATEMENTS:

          (1)  WII, the Borrowers, the Agents and the Banks have entered into an
Amended and Restated Revolving and Term Loan Agreement dated as of April 15,
1994 (as the same may be hereafter amended from time to time, the "Loan
Agreement"; the terms defined therein being used herein as therein defined
unless otherwise defined herein).

          (2)  Pursuant to the terms and conditions hereof, WII, the Borrowers,
the Agents and the Banks have agreed to amend the Loan Agreement to revise the
definition of "Consolidated Capital Expenditures".

          SECTION 1.     AMENDMENT TO LOAN AGREEMENT.  Schedule 1 to the Loan
Agreement is, effective as of the date hereof, hereby amended by amending the
definition of "Consolidated Capital Expenditures" in its entirety to read as
follows:

          "CONSOLIDATED CAPITAL EXPENDITURES" Shall mean for any
          period, as to WII and all of its Subsidiaries, all capital
          expenditures made during such period, as determined in
          accordance with GAAP (including, in any event, all
          acquisitions and all Investments of the type described in
          Sections 10.4(c) and 10.4(l)); PROVIDED, HOWEVER, (i) that
          for purposes of calculating compliance with Sections 10.1(d)
          and 10.1(e) hereof, "Consolidated Capital

                                       -1-

<PAGE>

          Expenditures" shall not include (A) the Acquisitions or (B) any
          capital expenditures of WII and its Subsidiaries incurred prior to the
          Closing Date in connection with the Prior Acquisitions or (C) any
          Investment or acquisition made on or after the Closing Date of the
          type described by Section 10.4(l) or Section 10.6(e) (as the case may
          be) but in excess of the amount of Investment or acquisition permitted
          by Section 10.4(l) or Section 10.6(e) (as the case may be), to which
          the Majority Banks shall give their prior written consent (by way of
          illustration of subsection (i)(C) of this definition, the full amount
          of a $15,000,000 Investment of the type described by Section 10.4(l),
          to which the Majority Banks have given their prior written consent,
          would be completely excluded for the purposes of calculating
          compliance with Section 10.1(d) or 10.1(e) hereof); and (ii) that for
          purposes of calculating compliance with Section 10.1(d) hereof,
          "Consolidated Capital Expenditures" shall include only those
          non-discretionary capital expenditures incurred (A) to permit
          compliance with Law and (B) in connection with necessary repairs,
          renewals and replacements to Property.

          SECTION 2.     CERTAIN CONSENTS OF THE AGENTS AND THE BANKS.
Notwithstanding the prohibitions contained in Sections 10.5 and 10.6 and the
second sentence of Section 9.8 of the Loan Agreement, each of the Agents and the
Banks, by its execution and delivery of this Amendment, provides its written
consent to the transactions that are described below; PROVIDED, THAT, no Default
or Event of Default which may arise from any such transaction due to a violation
of any other provision of the Loan Agreement is hereby waived:

          (a)  The merger of W/Management, Inc., an Immaterial Subsidiary, into
WUSI.

          (b)  The merger of European Material Inspection (EMI) B.V., an
Immaterial Subsidiary, into Weatherford Oil Tool Nederland B.V., a Borrowing
Subsidiary.

          (c)  The transfer by Weatherford Eurasia B.V., a Material Subsidiary,
of the capital stock of EMI-Elettro Magnetica Ispezioni Italia S.r.l., an
Immaterial Subsidiary ("EMI-Italy"), to Weatherford Mediterranea S.p.A., a
Borrowing Subsidiary ("WEMESPA").

          (d)  The merger of EMI-Italy into WEMESPA.

          SECTION 3.     CONDITIONS OF EFFECTIVENESS.  This Amendment shall
become effective when, and only when the Administrative Agent shall have
received counterparts of this Amendment executed by the parties hereto.

                                       -2-

<PAGE>

   SECTION 4. REPRESENTATIONS AND WARRANTIES OF WII AND THE BORROWERS. WII
and the Borrowers hereby represent and warrant as follows:

  (a)  The representations and warranties contained in the Loan Documents are
true and accurate in all material respects on and as of the date hereof as
though made on and as of such date (except to the extent that such
representations and warranties relate solely to an earlier date).

  (b) No Default or Event of Default has occurred and is continuing as of the
date hereof, after giving effect hereto.

  SECTION 5. REFERENCE TO AND EFFECT ON THE LOAN DOCUMENTS. (a) Upon the
effectiveness hereof, on and after the date hereof each reference in the Loan
Agreement to "this Agreement", "hereunder", "hereof" or words of like
import referring to the Loan Agreement, and each reference in the other Loan
Documents to "the Loan Agreement", "thereunder", "thereof" or words of
like import referring to the Loan Agreement, shall mean and be a reference to
the Loan Agreement as amended hereby. This Amendment is a "Loan Document."

  (b) Except as specifically amended above, the Loan Agreement and the Notes,
and all other Loan Documents, are and shall continue to be in full force and
effect and are hereby in all respects ratified and confirmed. Without
limiting the generality of the foregoing, the Security Documents and the
Collateral described therein do and shall continue to secure the payment of
all obligations of the Borrowers under the Loan Agreement, the Notes and the
other Loan Documents, in each case as amended hereby.

  (c) The execution, delivery and effectiveness of this Amendment shall not,
except as expressly provided herein, operate as a waiver of any right, power
or remedy of the Agents or the Banks under any of the Loan Documents, nor
constitute a waiver of any provision of any of the Loan Documents.

  SECTION 6. COSTS AND EXPENSES. WII and the Borrowers agree to pay the costs
and expenses incurred in connection herewith pursuant to Section 13.3 of the
Loan Agreement.

  SECTION 7. EXECUTION IN COUNTERPARTS. This Amendment may be executed in any
number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to
be an original and all of which taken together shall constitute but one and
the same agreement.

  SECTION 8. GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

  SECTION 9. FINAL AGREEMENT. THE LOAN DOCUMENTS, THIS WRITTEN AMENDMENT AND
THE OTHER WRITTEN AGREEMENTS ENTERED INTO

                                      -3-

<PAGE>

IN CONNECTION THEREWITH REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND
MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS
BETWEEN THE PARTIES.

  IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                       WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________


                                       WEATHERFORD U.S., INC.


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________


                                       WEATHERFORD/LAMB, INC.



                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________


                                       CREDIT LYONNAIS NEW YORK BRANCH,
                                        as a Bank and as Administrative Agent


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________

                                      -4-

<PAGE>

                                       TEXAS COMMERCE BANK NATIONAL
                                        ASSOCIATION, as a Bank and as
                                        Syndication and Collateral Agent


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       ARAB BANKING CORPORATION (B.S.C.),
                                        as a Bank and as a Co-Agent


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       BANK OF SCOTLAND


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________

                                      -5-

<PAGE>

                                       CORESTATES BANK, N.A.


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       FIRST INTERSTATE BANK OF TEXAS, N.A.


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       WELLS FARGO BANK


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       UNION BANK


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________

                                      -6-

<PAGE>

                                       DEN NORSKE BANK AS


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________


                                       BANQUE PARIBAS


                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________



                                       By: ________________________________
                                       Name: ______________________________
                                       Title: _____________________________






                                      -7-



<PAGE>


                                                 (Amended as of August 28, 1995)



                                    AGREEMENT


          This Agreement, dated as of June 23, 1995 (this "Agreement"), among
WEATHERFORD INTERNATIONAL INCORPORATED, a Delaware corporation ("Weatherford"),
and AMERICAN GAS & OIL INVESTORS, LIMITED PARTNERSHIP, a New York limited
partnership, AMGO II, LIMITED PARTNERSHIP, a New York limited partnership, AMGO
III, LIMITED PARTNERSHIP, a New York limited partnership, FIRST RESERVE SECURED
ENERGY ASSETS FUND, LIMITED PARTNERSHIP, a Delaware limited partnership, FIRST
RESERVE FUND V, LIMITED PARTNERSHIP, a Delaware limited partnership, FIRST
RESERVE FUND V-2, LIMITED PARTNERSHIP, a Delaware limited partnership, and
FIRST RESERVE FUND VI, LIMITED PARTNERSHIP, a Delaware limited partnership
(each a "First Reserve Fund" and together the "First Reserve Funds"), and
First Reserve Corporation, a Delaware corporation ("FRC").  (The First Reserve
Funds and FRC, and all other persons or entities now or hereafter directly or
indirectly controlling, controlled by or under common control with any of the
First Reserve Funds or FRC, are referred to collectively as the "FRC Group.")


                                   WITNESSETH:

          WHEREAS, the First Reserve Funds currently own in the aggregate
approximately 11,212,349 shares of common stock, par value $1.00 per share
("Enterra Common Stock"), of Enterra Corporation, a Delaware corporation
("Enterra");

          WHEREAS, the shares of Enterra Common Stock owned by the First Reserve
Funds currently are subject to the terms and conditions of that certain
Agreement dated as of May 2, 1994 among Enterra, the First Reserve Funds and FRC
(the "Enterra Standstill Agreement");

          WHEREAS, pursuant to an agreement and plan of merger (the "Merger
Agreement") dated June 23, 1995 between Enterra and Weatherford, each share of
outstanding Enterra Common Stock shall, at the Effective Time (as defined in the
Merger Agreement), be converted, pursuant to a merger (the "Merger") of Enterra
with and into Weatherford, into 0.845 of a share (which number reflects a one
for two reverse stock split to be effected at the closing) of common stock, par
value $.10 per share, of Weatherford ("Weatherford Common Stock");

          WHEREAS, pursuant to the terms of the Merger, the First Reserve Funds
will own, as of the Effective Time, in the aggregate 9,474,431 shares (which
number reflects a one for two

<PAGE>

reverse stock split to be effected at the closing) of Weatherford Common Stock;

          WHEREAS, Weatherford and the FRC Group are entering into this
Agreement to establish certain arrangements with respect to the relationships
between them after the Effective Time, which arrangements are substantially
similar to the arrangements provided for in the Enterra Standstill Agreement;
and

          WHEREAS, Weatherford and the FRC Group believe that these arrangements
will be in the best interests of Weatherford and all of its shareholders from
and after the Effective Time.

          NOW, THEREFORE, intending to be legally bound as of the Effective
Time, the parties hereto agree as follows:

          Section 1.  CERTAIN DEFINITIONS.  As used in this Agreement, the
following terms shall have the following meanings:

          1.1. "Weatherford Voting Securities" shall mean collectively
Weatherford Common Stock, Weatherford preferred stock, par value $1.00 per
share, if entitled to vote generally for the election of directors or otherwise,
any other class or series of Weatherford securities that is entitled to vote
generally for the election of directors or otherwise, and any other securities,
warrants or options or rights of any nature (whether or not issued by
Weatherford) that are convertible into, exchangeable for, or exercisable for the
purchase of, or otherwise give the holder thereof any rights in respect of
Weatherford Common Stock, Weatherford preferred stock that is entitled to vote
generally for the election of directors or otherwise, or any other class or
series of Weatherford securities that is entitled to vote generally for the
election of directors or otherwise.

          1.2. "Termination Date" shall mean August 12, 2004.

          1.3. The "Combined Voting Power" at any measurement date shall mean
the total number of votes which could have been cast in an election of directors
of Weatherford had a meeting of the stockholders of Weatherford been duly held
based upon a record date as of the measurement date if all Weatherford Voting
Securities then outstanding and entitled to vote at such meeting were present
and voted to the fullest extent possible at such meeting.

          1.4. "13D/G Group" shall mean two or more persons acting together for
the purpose of acquiring, holding, voting or disposing of Weatherford Voting
Securities, which persons would be required under the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and the rules and regulations promulgated


                                       -2-
<PAGE>

thereunder to file a statement on Schedule 13D or 13G with the Securities and
Exchange Commission (the "SEC") as a "person" within the meaning of Section
13(d)(3) of the Exchange Act if such persons beneficially owned sufficient
securities to require such a filing under the Exchange Act.

          1.5. The concept of "beneficial ownership" and the terms "person" and
"group" shall have the meanings defined or adopted from time to time pursuant to
Regulation 13D-G adopted by the SEC under the Exchange Act.

          Section 2.  REPRESENTATIONS AND WARRANTIES OF WEATHERFORD. Weatherford
represents and warrants that:

               (a)  Weatherford is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, with
corporate power to own its properties and to conduct its business as now
conducted.

               (b)  As of June 21, 1995, the authorized capital stock of
Weatherford consists of (i) 80,000,000 shares of Weatherford Common Stock, of
which 54,276,632 shares were validly issued and outstanding, fully paid and
nonassessable and (ii) 1,000,000 shares of preferred stock, par value $1.00 per
share, of which no shares were issued and outstanding.

               (c)  Weatherford has full legal right, power and authority to
enter into this Agreement and perform its obligations hereunder.  This Agreement
has been duly authorized, executed and delivered by Weatherford and constitutes
a legal, valid and binding agreement of Weatherford enforceable against
Weatherford in accordance with the terms hereof.

               (d)  Neither the execution and delivery of this Agreement nor the
performance of its obligations hereunder will conflict with or result in a
breach of or constitute a default under any law, rule, regulation, judgment,
order or decree of any court, arbitrator or governmental agency or
instrumentality or of its corporate charter or bylaws or of any agreement or
instrument to which it is a party or subject or by which its property is bound
or affected.

          Section 3.  REPRESENTATIONS AND WARRANTIES OF THE FRC GROUP.  Each of
the First Reserve Funds and FRC, jointly and severally, represents and warrants
to Weatherford as follows:

               (a)  Each First Reserve Fund is a validly existing partnership
under the laws of the jurisdiction of its organization, FRC is a validly
existing corporation under the laws of the jurisdiction of its incorporation,
and each First Reserve Fund and FRC has the full legal right, power and


                                       -3-
<PAGE>

authority to enter into this Agreement and perform their respective obligations
hereunder.

               (b)  This Agreement has been duly authorized, executed and
delivered by each First Reserve Fund and by FRC, and this Agreement constitutes
the legal, valid and binding agreement of the FRC Group, enforceable against the
members of the FRC Group in accordance with the terms hereof.

               (c)  Neither the execution and delivery of this Agreement nor the
performance of their obligations hereunder will conflict with or result in a
breach of or constitute a default under any law, rule, regulation, judgment,
order or decree of any court, arbitrator or governmental agency or
instrumentality or of any agreement or instrument to which any First Reserve
Fund or FRC is bound or affected, or of the partnership agreements of any of the
First Reserve Funds, or of the charter and bylaws of FRC.

               (d)  As of the date of this Agreement and as of the Effective
Time, (i) each First Reserve Fund owns and will own of record the shares of
Enterra Common Stock set forth opposite its respective name on the signature
page of this Agreement, (ii) there are and will be no beneficial owners of such
shares of Enterra Common Stock other than the First Reserve Funds and FRC, (iii)
such shares of Enterra Common Stock represent and will represent all of the
shares of Enterra Common Stock owned of record or beneficially by the First
Reserve Funds and FRC, and (iv) such shares of Enterra Common Stock are and will
be owned of record and beneficially by the First Reserve Funds and FRC, free and
clear of all pledges, liens, claims, security interests and other charges or
defects in title of any nature whatsoever.  No shares of Weatherford Common
Stock are currently, and as of the Effective Time no shares of Weatherford
Common Stock will be, beneficially owned by any member of the FRC Group, except
for those shares of Weatherford Common Stock issuable in the Merger upon
conversion of such shares of Enterra Common Stock.

          Section 4.  COVENANTS WITH RESPECT TO WEATHERFORD VOTING SECURITIES
AND OTHER MATTERS.  Prior to the Termination Date and subject to the further
provisions hereof:

          4.1. ACQUISITION OF WEATHERFORD VOTING SECURITIES.  No member of the
FRC Group shall, directly or indirectly, acquire, offer to acquire, agree to
acquire, become the beneficial owner of or obtain any rights in respect of any
Weatherford Voting Securities, by purchase or otherwise, or take any action in
furtherance thereof, if the effect of such acquisition, agreement or other
action would be (either immediately or upon consummation of any such
acquisition, agreement or other action, or expiration of any period of time
provided in any such acquisition, agreement or other action) (i) to increase the
aggregate beneficial ownership of Weatherford Voting Securities by the FRC Group
to


                                       -4-
<PAGE>

such number of Weatherford Voting Securities that represents or possesses 20% or
more of the Combined Voting Power of Weatherford Voting Securities, or (ii) to
increase the aggregate beneficial ownership of any class or series of
Weatherford Voting Securities by the FRC Group to greater than 20% of such class
or series. Notwithstanding the foregoing maximum percentage limitation, (A) no
member of the FRC Group shall be obligated to dispose of any Weatherford Voting
Securities beneficially owned in violation of such maximum percentage
limitations if, and solely to the extent that, the aggregate beneficial
ownership of the FRC Group is or will be increased solely as a result of a
recapitalization of Weatherford, a repurchase of any Weatherford Voting
Securities by Weatherford or any of its subsidiaries, or any other action taken
by Weatherford or its affiliates (except the FRC Group), if such
recapitalization, repurchase or other action was approved by a majority of the
directors then in office who were not designated by the FRC Group, and (B) if
any other person or group beneficially owns or acquires beneficial ownership of
Weatherford Voting Securities representing greater than 20% of the Combined
Voting Power, the applicable maximum percentage shall be increased to such
greater percentage.  For purposes of calculating the maximum percentage
limitations, all Weatherford Voting Securities that are the subject of an
agreement, arrangement or understanding pursuant to which the FRC Group or any
member thereof has the right to obtain beneficial ownership of such securities
in the future shall also be deemed to be beneficially owned by the FRC Group or
the applicable member thereof.

          4.2. DISTRIBUTION OF WEATHERFORD VOTING SECURITIES.  Each member of
the FRC Group covenants that it shall not, directly or indirectly, sell,
transfer any beneficial interest in, pledge, hypothecate or otherwise dispose of
any Weatherford Voting Security, except by conversion, exchange or exercise of
such Weatherford Voting Securities pursuant to their terms in a manner not
otherwise in violation of Section 4.1 hereof, in response to certain tender or
exchange offers as permitted by Section 4.6(b) hereof, or pursuant to:

               (i)  a bona fide pledge of or the granting of a security interest
          or any other lien or encumbrance in such Weatherford Voting Securities
          to a lender that is not a member of the FRC Group to secure a bona
          fide loan for money borrowed made to one or more members of the FRC
          Group with full recourse to the borrower or borrowers, the foreclosure
          of such pledge or security interest or any other lien or encumbrance
          that may be placed involuntarily upon any Weatherford Voting
          Securities, or the subsequent sale or other disposition of such
          Weatherford Voting Securities by such lender or its agent;


                                       -5-
<PAGE>

               (ii)  a transfer, assignment, sale or disposition of such
          Weatherford Voting Securities within the FRC Group to a member of the
          FRC Group that has signed this Agreement;

               (iii)  a distribution of Weatherford Voting Securities to any
          partner of a First Reserve Fund; provided that any distributee that is
          a member of the FRC Group has signed this Agreement; and provided,
          further that any arrangements coordinated or initiated by FRC to
          assist limited partners in the sale of Weatherford Voting Securities
          distributed to them must comply with the provisions of this Section
          4.2;

               (iv)  sale in a public offering registered under the Act pursuant
          to the registration rights provided in Section 6 hereof;

               (v)  sales in broker's transactions, effected on the New York
          Stock Exchange or any other securities exchange on which the
          Weatherford Voting Securities are listed or in any other public
          trading market in which the Weatherford Voting Securities are then
          being traded, in compliance with the provisions of Rule 144 under the
          Act, ("Rule 144"), including the volume restrictions set forth in such
          rule (excluding for purposes of this clause (v) sales pursuant to the
          provisions of paragraph (k) of Rule 144, which sales are included
          under (vi) below);

               (vi)   sales pursuant to paragraph (k) of Rule 144;

               (vii)  other negotiated sales of Weatherford Voting Securities;
          or

               (viii)  as provided in Section 4.6(b).

Notwithstanding the previous sentence, (A) in effecting any sale, transfer of
any beneficial interest in or other disposition of Weatherford Voting Securities
pursuant to clause (iv) above, the members of the FRC Group selling,
transferring or disposing such Weatherford Voting Securities shall use their
reasonable best efforts to refrain from selling, transferring or disposing of
such number of Weatherford Voting Securities as represent 3% or more of the
Combined Voting Power to any one person or group, (B) no single sale, transfer
of beneficial interest in or other disposition of any Weatherford Voting
Securities may be made by any member of the FRC Group, and no related group of
such sales, transfers or dispositions shall be made by the FRC Group, pursuant
to clauses (iii), (vi) and (vii) above if such number of Weatherford Voting
Securities as represent 5% or more of the


                                       -6-
<PAGE>

Combined Voting Power are being sold, transferred or disposed of to any one
person or group; and (C) no sale, transfer of any beneficial interest in or
other disposition of Weatherford Voting Securities shall be made pursuant to
clauses (iii), (vi) and (vii) above to any one person or group who, upon
consummation of such sale, transfer or disposition of Weatherford Voting
Securities would, directly or indirectly, have beneficial ownership of or the
right to acquire beneficial ownership of such number of Weatherford Voting
Securities as represent 10% or more of the Combined Voting Power.

          4.3. VOTING TRUSTS.  No member of the FRC Group shall deposit any
Weatherford Voting Securities in a voting trust or subject any Weatherford
Voting Securities to any arrangement or agreement with respect to the voting of
such securities unless all the parties to such voting trust, arrangement or
agreement are members of the FRC Group who have executed this Agreement.

          4.4. PROXY SOLICITATIONS, ETC.  No members of the FRC Group shall
solicit proxies, assist any other person in the solicitation of proxies, become
a "participant" in a "solicitation," or assist any "participant" in a
"solicitation" (as such terms are defined in Rule 14a-1 of Regulation 14A under
the Exchange Act) in opposition to the recommendation of a majority of the
directors of Weatherford then in office who were not designated by the FRC
Group, or recommend or request that any other person take any such actions, or
submit any proposal for the vote of stockholders of Weatherford.

          4.5. STOCK POOLING.  No member of the FRC Group shall join a
partnership, limited partnership, syndicate or other group, or otherwise act in
concert with any other person, for the purpose of acquiring, holding, voting or
disposing of any Weatherford Voting Securities, or otherwise become a member of
a 13D/G Group other than the FRC Group itself.

          4.6. TAKEOVER OFFERS.

               (a)  Each member of the FRC Group covenants and agrees not to (i)
publicly suggest or announce its willingness or desire to engage in a
transaction or group of transactions or have another person engage in a
transaction or group of transactions that would result in a change of control of
Weatherford, (ii) present to Weatherford or to any third party any proposal that
can reasonably be expected to result in a change of control of Weatherford, or
(iii) initiate, induce or attempt to induce or give encouragement to any other
person to initiate any proposal that can reasonably be expected to result in a
change of control of Weatherford.

               (b)  Subject to compliance with Section 4.6(a) above, on and
after the eleventh business day after commencement


                                       -7-
<PAGE>

of a tender or exchange offer made by a person who is not a member of the FRC
Group for outstanding Weatherford Voting Securities (a "Qualifying Offer"), any
member of the FRC Group may tender or exchange any Weatherford Voting Securities
beneficially owned by it pursuant to such Qualifying Offer if the Qualifying
Offer shall have been approved, or not opposed, by the board of directors of
Weatherford.  If a Qualifying Offer is opposed by the board of directors of
Weatherford, then, from and after the eleventh business day after commencement
of such Qualifying Offer, any member of the FRC Group may tender or exchange
shares of Weatherford Voting Securities pursuant to such Qualifying Offer only
if (i) no tender or exchange of, or indication of an intention to tender or
exchange, Weatherford Voting Securities is made by any member of the FRC Group
earlier than 24 hours prior to the expiration of any time after which
Weatherford Voting Securities tendered may be treated less favorably than
Weatherford Voting Securities tendered or exchanged prior thereto, and (ii) a
binding agreement is reached with the bidder or offeror prior to any tender or
exchange specifying that only such number of Weatherford Voting Securities
submitted for tender or exchange shall be accepted by the bidder or offeror as
are equal to (A) the percentage of such Weatherford Voting Securities not
beneficially owned by the FRC Group that have been tendered or exchanged,
multiplied by (B) the total number of such Weatherford Voting Securities
beneficially owned by the member of the FRC Group.

          4.7.  PLEDGE OF COVERED SECURITIES.  Each member of the FRC Group
shall promptly give notice to Weatherford of any margin call, demand for
additional security or collateral, or threat to enforce any pledge or security
interest in or with respect to any Weatherford Voting Security owned of record
or beneficially by it.

          Section 5.  VOTING OF WEATHERFORD VOTING SECURITIES AND OTHER RELATED
MATTERS.

               (a)  Each member of the FRC Group that is a holder of record of
Weatherford Voting Securities shall be present, and each member of the FRC Group
that is a beneficial owner of Weatherford Voting Securities shall cause the
holder of record to be present, in person or by proxy, at all meetings of
stockholders of Weatherford so that all Weatherford Voting Securities owned of
record or beneficially by the FRC Group may be counted for the purpose of
determining the presence of a quorum at such meetings.

               (b)  Upon the Effective Time, the number of directors of
Weatherford shall be established as 10 directors, and two individuals designated
by the FRC Group shall be elected as directors of Weatherford, subject to the
provisions of this Agreement.  The parties hereto agree that the number of
directors


                                       -8-
<PAGE>

of Weatherford may not be increased above 10 without the approval of a (i) a
majority of the directors and (ii) all of the directors designated by the FRC
Group.  From and after the Effective Time, the FRC Group and the directors
designated by the FRC Group shall take no action to reduce the number of
directors of Weatherford below 10 directors.

               (c)  For purposes of this Agreement, directors "designated by the
FRC Group" shall include directors designated by the FRC Group as set forth in
Section 5.22 of the Merger Agreement or designated by certain members of the FRC
Group as anticipated by this Section 5, and any other directors of Weatherford
affiliated or associated with any member of the FRC Group.

               (d)  From and after the Effective Time, as long as the FRC Group
beneficially owns at least 15% of the Combined Voting Power of all Weatherford
Voting Securities, two of (i) First Reserve Secured Energy Assets Fund, Limited
Partnership, (ii) First Reserve Fund V, Limited Partnership, (iii) First Reserve
Fund V-2, Limited Partnership and (iv) First Reserve Fund VI, Limited
Partnership (the "Designating First Reserve Funds") as shall be selected by FRC
shall have the right to designate one director of Weatherford, for a total of
two directors of Weatherford (it being understood that the FRC Group shall not
have more than two designees on the board of directors of Weatherford at any
time); provided, however, that:

               (i)  At any time when the FRC Group beneficially owns less than
          15% but at least 10% of the Combined Voting Power of all Weatherford
          Voting Securities, one of the Designating First Reserve Funds, to be
          selected by FRC, shall lose its right to designate a director of
          Weatherford, and such Designating First Reserve Fund shall cause its
          designee on the board of directors of Weatherford to resign forthwith
          such that only one designee of the FRC Group remains on the board of
          directors of Weatherford; and

               (ii)  At any time when the FRC Group beneficially owns less than
          10% of the Combined Voting Power of all Weatherford Voting Securities,
          none of the FRC Group shall have the right to designate any directors
          of Weatherford, and the Designating First Reserve Fund whose designee
          remains on Weatherford's board of directors shall cause its designee
          to resign forthwith such that no designee of the FRC Group remains on
          the board of directors of Weatherford, it being understood that at any
          time that the FRC Group beneficially owns less than 10% of the
          Combined Voting Power of Weatherford Voting Securities no member of
          the FRC


                                       -9-
<PAGE>

          Group shall seek representation on the board of directors of
          Weatherford.

               (e)  Weatherford shall take all necessary or appropriate action
to (i) assist in the nomination for election as directors of those persons
designated by the Designating First Reserve Funds as are entitled to election to
the board of directors of Weatherford pursuant to the provisions of this Section
5, (ii) have at least one of the designees of the FRC Group serve on each
committee of the board of directors of Weatherford as long as the Designating
First Reserve Funds have designated at least two directors pursuant to the
provisions of this Section 5 and (iii) where two designees of the FRC Group are
serving as directors of Weatherford, have each such designee serve in different
classes of directors.  The Designating First Reserve Funds shall cause their
designees on the board of directors of Weatherford to take all necessary or
appropriate action to assist in the nomination for election as directors of such
other nominees as may be selected by a majority of the directors of Weatherford
then in office who were not designated by the Designating First Reserve Funds,
and the FRC Group shall vote all Weatherford Voting Securities owned of record
by any member of the FRC Group, and shall cause all Weatherford Voting
Securities owned beneficially by any member of the FRC Group to be voted, for
the election of such other nominees as well as for the election of all nominees
of the Designating First Reserve Funds designated by them pursuant to this
Section 5.

               (f)  At any time that one of the Designating First Reserve Funds
does not have a representative serving as a director of Weatherford, an
individual designated by such Designating First Reserve Fund shall have the
right to attend all meetings of the board of directors in a nonvoting observer
capacity, to receive notice of such meetings and to receive the information
provided by Weatherford to its board of directors; provided, however, that
Weatherford may require as a condition precedent to any of such person's rights
under this section that such person agree to hold in confidence and trust and to
act in a fiduciary manner with respect to all information received in connection
with board meetings or otherwise; and, provided further, that Weatherford
reserves the right not to provide information to such person, and to exclude
such person from any meeting or portion thereof, if delivery of such information
or attendance at such meeting would adversely affect the attorney-client
privilege between Weatherford and its counsel.  The observer right provided in
this Section 5(f) may be exercised (i) only if (and then only so long as) the
Designating First Reserve Fund has been advised in writing by counsel to such
fund that exercise of this right is reasonably necessary for such Designating
First Reserve Fund to qualify through its investment in Weatherford as a
"venture capital operating company" as such term is defined in applicable U.S.
Department of Labor


                                      -10-
<PAGE>

regulations.  Notwithstanding the above, the FRC Group agrees to use its
reasonable best efforts to cause the Designating First Reserve Funds to qualify
as a "venture capital operating company" under these regulations without
exercise of its rights under this Section.

               (g)  Except as set forth in Section 5(e) above in respect of the
election of directors of Weatherford, each member of the FRC Group shall vote
all Weatherford Voting Securities owned of record by any member of the FRC
Group, and shall cause all Weatherford Voting Securities owned beneficially by
any member of the FRC Group to be voted, at the sole election of such members of
the FRC Group, either (i) in accordance with the recommendations of a majority
of the board of directors, or (ii) in the same proportions for, against and
abstaining in respect of any matter as the holders of record of Weatherford
Voting Securities other than those beneficially owned by the FRC Group that are
entitled to vote on such matter vote their Weatherford Voting Securities.

          6.  REGISTRATION RIGHTS.  Weatherford covenants and agrees as follows:


          6.1.  DEFINITIONS.  For purposes of this Section 6:

               (a)  The term "register," "registered" and "registration" refer
to a registration effected by preparing and filing a registration statement in
compliance with the Act.

               (b)  The term "Registrable Securities" means (i) the Weatherford
Common Stock issuable to the First Reserve Funds as of the Effective Time in
connection with the Merger, and (ii) any Weatherford Common Stock issued as (or
issuable upon the conversion, exchange or exercise of any warrant, right or
other security which is issued as) a dividend or other distribution with respect
to such Weatherford Common Stock; provided, however, that Weatherford Common
Stock sold, transferred or disposed of in accordance with Section 4.2 of the
Agreement to a person to whom registration rights may not be assigned pursuant
to Section 6.13 of the Agreement shall no longer thereafter be considered
Registrable Securities.

               (c)  The term "Holder" means any member of the FRC Group that (i)
has signed this Agreement and (ii) owns of record Registrable Securities.

               (d)  The term "Form S-3" means such form under the Act as in
effect on the date hereof or any registration form under the Act subsequently
adopted by the SEC which permits inclusion or incorporation of substantially all
the required information regarding Weatherford by reference to other documents
filed by Weatherford with the SEC.


                                      -11-
<PAGE>

          6.2.  REQUEST FOR REGISTRATION.

               (a)  If, at any time commencing three months after the Effective
Time of the Merger, Weatherford shall receive a written request from the Holders
of at least 25% of the Registrable Securities then outstanding that Weatherford
file a registration statement under the Act covering the registration of at
least 25% of the Registrable Securities then outstanding (or a lesser percent if
the anticipated aggregate offering price, net of underwriting discounts and
commissions, would exceed $25,000,000), then Weatherford shall, within 10 days
after the receipt thereof, give written notice of such request to all Holders,
and shall, subject to the limitations of Section 6.2(b), effect as soon as
practicable, and in any event within 45 days after the receipt of such request,
the registration under the Act of all Registrable Securities which the Holders
request to be registered within 15 days after the mailing of such notice by
Weatherford in accordance with Section 10.3.  It is understood that all
calculations in this Agreement in respect of a specified percentage of
Registrable Securities then outstanding are to be  made only in respect of the
total number of such Registrable Securities, as defined in Section 6.1(b) above,
then outstanding, and not in respect of the total number of shares of
Weatherford Common Stock then outstanding.

               (b)  If the Holders initiating the registration request hereunder
("Initiating Holders") intend to distribute the Registrable Securities covered
by their request by means of an underwriting, they shall so advise Weatherford
as a part of their request made pursuant to this Section 6.2 and Weatherford
shall include such information in the written notice referred to in subsection
6.2(a).  In such event, the right of any Holder to include Registrable
Securities in such registration shall be conditioned upon such Holder's
participation in such underwriting and the inclusion of such Holder's
Registrable Securities in the underwriting to the extent provided herein.  All
Holders proposing to distribute Registrable Securities through such underwriting
shall (together with Weatherford as provided in subsection 6.4(e)) enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for such underwriting by Weatherford and reasonably acceptable to a
majority in interest of the Initiating Holders.  Weatherford at its sole
discretion may offer a right to participate in any registration statement filed
pursuant to this Section 6.2 to other stockholders of Weatherford Common Stock,
and may itself participate in any registration statement filed pursuant to this
Section 6.2 hereof.  However, notwithstanding any other provision of this
Section 6.2, if the offering is an underwritten offering and the lead managing
underwriter advises the Initiating Holders in writing that marketing factors
require a limitation of the number of shares of Weatherford Common Stock to be
underwritten, then the total number of shares of Common Stock to be


                                      -12-
<PAGE>

underwritten shall be reduced, with such reduction coming first from selling
stockholders who are not Holders, and then from Weatherford. If further
reduction is required, Weatherford shall so advise all Holders of Registrable
Securities that would have otherwise been underwritten pursuant hereto, and the
number of shares of Registrable Securities that may be included in the
underwriting shall be allocated among all Holders thereof, including the
Initiating Holders, in proportion (as nearly as practicable) to the amount of
Registrable Securities sought to be registered by each Holder.

               (c)  Weatherford is obligated to effect only four such
registrations pursuant to this Section 6.2.

               (d)  Notwithstanding the foregoing, if Weatherford shall furnish
to Holders requesting a registration statement pursuant to this Section 6.2, a
certificate signed by the President of Weatherford stating that in the good
faith judgment of a majority of the directors of Weatherford then in office who
were not designated by the FRC Group, it would be materially detrimental to
Weatherford for such registration statement to be filed, Weatherford shall have
the right to defer such filing for a period of not more than 60 days after
receipt of the request of the Initiating Holders; provided, however, that
Weatherford may not utilize this right more than once in any 12-month period.

          6.3.  PIGGYBACK REGISTRATION.  If (but without any obligation to do
so) Weatherford proposes to register any of its Common Stock under the Act in
connection with the public offering of such Common Stock by Weatherford solely
for cash (other than a registration relating solely to the sale of securities to
participants in a dividend reinvestment plan, stock plan or employee benefit
plan; a registration relating solely to the issuance of securities in connection
with an acquisition; or a registration on any form which does not permit
inclusion of selling stockholders), or Weatherford proposes to register any of
its securities on behalf of a holder exercising demand registration rights
similar to those set forth in Section 6.2 above, Weatherford shall, at such
time, promptly give each Holder written notice of such registration.  Upon the
written request of each Holder given within 15 days after mailing of such notice
by Weatherford in accordance with Section 10.3, Weatherford shall, subject to
the provisions of Section 6.8, cause to be registered under the Act all of the
Registrable Securities that each such Holder has requested to be registered.

          6.4.  OBLIGATIONS OF WEATHERFORD.  Whenever required under this
Section 6 to effect the registration of any Registrable Securities, Weatherford
shall, as expeditiously as reasonably possible:


                                      -13-
<PAGE>

               (a)  Prepare and file with the SEC a registration statement with
respect to such Registrable Securities and use its best efforts to cause such
registration statement to become effective, and, upon the request of the Holders
of a majority of the Registrable Securities registered thereunder, keep such
registration statement effective for up to 90 days.

               (b)  Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Act with respect to the disposition of all securities covered
by such registration statement.

               (c)  Furnish to the Holders such numbers of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the Act, and such other documents as they may reasonably request
in order to facilitate the disposition of Registrable Securities owned by them.

               (d)  Use its best efforts to register and qualify the securities
covered by such registration statement under such other securities or Blue Sky
laws of such jurisdictions as shall be reasonably requested by the Holders,
provided that Weatherford shall not be required to qualify to do business or to
file a general consent to service of process in any such states of
jurisdictions.

               (e)  In the event of any underwritten public offering, enter into
and perform its obligations under an underwriting agreement, in usual and
customary form, with the underwriters of such offering.  Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

               (f)  Notify each Holder of Registrable Securities covered by such
registration statement at any time when a prospectus relating thereto is
required to be delivered under the Act of the happening of any event as a result
of which the prospectus included in such registration statement, as then in
effect, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing, and then
use its best efforts to promptly correct such statement or omission.
Notwithstanding the foregoing and anything to the contrary set forth in this
Section, each Holder acknowledges that there may occasionally be times when
Weatherford must suspend the use of the prospectus forming a part of the
registration statement until such time as an amendment to the registration
statement has been filed by Weatherford and declared effective by the SEC, or
until such time as Weatherford has filed an appropriate report with the


                                      -14-
<PAGE>

SEC pursuant to the Exchange Act.  Each Holder hereby covenants that it will not
sell any shares of Common Stock pursuant to said prospectus during the period
commencing at the time at which Weatherford gives the Holder notice of the
suspension of the use of said prospectus and ending at the time Weatherford
gives the Holder notice that it may thereafter effect sales pursuant to said
prospectus.  Weatherford shall only be able to suspend the use of said
prospectus for periods aggregating no more than 30 days in respect of any
registration.

          6.5.  FURNISH INFORMATION.  It shall be a condition precedent to the
obligations of Weatherford to take any action pursuant to this Section 6 with
respect to the Registrable Securities of any selling Holder that such Holder
shall furnish to Weatherford such information regarding itself, the Registrable
Securities held by it, and the intended method of disposition of such securities
as shall be required to effect the registration of such Holder's Registrable
Securities and as may be required from time to time to keep such registration
current.

          6.6.  EXPENSES OF DEMAND REGISTRATION.  All expenses incurred by or on
behalf of Weatherford in connection with registrations, filings or
qualifications pursuant to Section 6.2, including, without limitation, all
registration, filing and qualification fees, printers' and accounting fees, and
fees and disbursements of counsel for Weatherford, shall be borne by
Weatherford; provided, however, that Weatherford shall not be required to pay
for any expenses of any registration proceeding begun pursuant to Section 6.2 if
the registration request is subsequently withdrawn at the request of the Holders
of a majority of the Registrable Securities to be registered (in which case all
participating Holders shall reimburse Weatherford promptly for all such
reasonable expenses), unless the Holders of a majority of the Registrable
Securities agree to forfeit their right to one demand registration pursuant to
Section 6.2.  In no event shall Weatherford be obligated to bear underwriting
discounts and commissions and the fees and expenses of counsel to the selling
Holders.

          6.7.  EXPENSES OF PIGGYBACK REGISTRATION.  Weatherford shall bear and
pay all expenses incurred by or on behalf of Weatherford in connection with any
registration, filing or qualification of Registrable Securities with respect to
the registrations pursuant to Section 6.3 for each Holder, including, without
limitation, all registration, filing, and qualification fees, printing and
accounting fees and fees and disbursements of counsel for Weatherford relating
or allocable thereto, but excluding underwriting discounts and commissions
relating to Registrable Securities and the fees and disbursements of counsel for
the selling Holders.



                                      -15-
<PAGE>

          6.8.  UNDERWRITING REQUIREMENTS.  In connection with any offering
involving an underwriting of shares being issued by Weatherford, Weatherford
shall not be required under Section 6.3 to include any of the Holders'
Registrable Securities in such underwriting unless they accept the terms of the
underwriting as agreed upon between Weatherford and the underwriters selected by
it.  If the total amount of securities, including Registrable Securities,
requested by Holders and other stockholders to be included in such offering
exceeds the amount of securities sold other than by Weatherford that the
underwriters reasonably believe compatible with the success of the offering,
then Weatherford shall be required to include in the offering only that number
of such securities, including Registrable Securities, which the underwriters
believe will not jeopardize the success of the offering.  To achieve any
necessary reduction in the securities to be sold, the securities to be excluded
from the offering shall first be selected (in each case, pro rata among such
class of holders according to the total amount of securities proposed to be
included in the registration statement or in such other proportions as shall
mutually be agreed to by such class of holders) in the following order:  (i)
first, securities being included on behalf of holders other than members of the
FRC Group shall be excluded, except as provided in (iii) below; (ii) next, if
additional securities must be excluded, Registrable Securities included pursuant
to Section 6.3 shall be excluded; (iii) thereafter, if additional securities
must be excluded, securities included on behalf of a holder exercising demand
registration rights similar to those set forth in Section 6.2 shall be excluded,
and (iv) finally, if additional securities must be excluded, securities offered
by Weatherford shall be excluded.

          6.9.  DELAY OF REGISTRATION.  No Holder shall have any right to obtain
or seek an injunction restraining or otherwise delaying any such registration as
the result of any controversy that might arise with respect to the
interpretation or implementation of this Section 6.

          6.10.  INDEMNIFICATION.  In the event any Registrable Securities are
included in a registration statement under this Section 6:

               (a)  To the extent permitted by law, Weatherford will indemnify
and hold harmless each Holder and the affiliates of such Holder, and their
respective directors, officers, general and limited partners, agents and
representatives (and the directors, officers, affiliates and controlling persons
thereof), and each other person, if any, who controls such Holder within the
meaning of the Act or the Exchange Act, against any losses, claims, damages, or
liabilities (joint or several) to which they may become subject under the Act,
the Exchange Act or other federal or state law, insofar as such losses, claims,
damages, or liabilities (or actions in respect thereof) arise out of or are


                                      -16-
<PAGE>

based upon any of the following statements, omissions or violations
(collectively a "Violation"): (i) any untrue statement or alleged untrue
statement of a material fact contained in such registration statement, including
any preliminary prospectus (but only if such is not corrected in the final
prospectus) contained therein or any amendments or supplements thereto, (ii) the
omission or alleged omission to state therein a material fact required to be
stated therein, or necessary to make the statements therein not misleading (but
only if such is not corrected in the final prospectus), or (iii) any violation
or alleged violation by Weatherford in connection with the registration of
Registrable Securities under the Act, the Exchange Act, any state securities law
or any rule or regulation promulgated under the Act, the Exchange Act or any
state securities law; and Weatherford will pay to each such Holder, affiliate or
controlling person, as incurred, any legal or other expenses reasonably incurred
by them in connection with investigating or defending any such loss, claim,
damage, liability, or action; provided, however, that the indemnity agreement
contained in this Section 6.10(a) shall not apply to amounts paid in settlement
of any such loss, claim, damage, liability, or action if such settlement is
effected without the consent of Weatherford (which consent shall not be
unreasonably withheld), nor shall Weatherford be liable in any such case for any
such loss, claim, damage, liability, or action to the extent that it arises out
of or is based upon a violation which occurs in reliance upon and in conformity
with written information furnished expressly for use in connection with such
registration by any such Holder or controlling person.

               (b)  To the extent permitted by law, each selling Holder will
indemnify and hold harmless Weatherford, each of its directors, each of its
officers who has signed the registration statement, each person, if any, who
controls Weatherford within the meaning of the Act, any underwriter, any other
Holder selling securities in such registration statement and any controlling
person of any such underwriter or other Holder, against any losses, claims,
damages, or liabilities (joint or several) to which any of the foregoing persons
may become subject, under the Act, the Exchange Act or other federal or state
law, insofar as such losses, claims, damages, or liabilities (or actions in
respect thereto) arise out of or are based upon any Violation, in each case to
the extent (and only to the extent) that such Violation occurs in reliance upon
and in conformity with written information furnished by such Holder expressly
for use in connection with such registration; and each such Holder will pay, as
incurred, any legal or other expenses reasonably incurred by any person intended
to be indemnified pursuant to this subsection 6.10(b), in connection with
investigating or defending any such loss, claim, damage, liability, or action;
provided, however, that the indemnity agreement contained in this subsection
6.10(b) shall not apply to amounts paid in settlement of any such loss,


                                      -17-
<PAGE>

claim, damage, liability or action if such settlement is effected without the
consent of the Holder, which consent shall not be unreasonably withheld;
provided, that, in no event shall any indemnity under this Section 6.10(b)
exceed the gross proceeds from the offering received by such Holder.

               (c)  Promptly after receipt by an indemnified party under this
Section 6.10 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 6.10, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties.  The failure to deliver written notice to the
indemnifying party within a reasonable time after the commencement of any such
action, if materially prejudicial to its ability to defend such action, shall
relieve such indemnifying party of any liability to the indemnified party under
this Section 6.10, but the omission so to deliver written notice to the
indemnifying party will not relieve it of any liability that it may have to any
indemnified party otherwise than under this Section 6.10.  The indemnified party
shall have the right, but not the obligation, to participate in the defense of
any action referred to above through counsel of its own choosing and shall have
the right, but not the obligation, to assert any and all separate defenses,
cross claims or counterclaims which it may have, and the fees and expenses of
such counsel shall be at the expense of such indemnified party unless (i) the
employment of such counsel has been specifically authorized in advance by the
indemnifying party, (ii) there is a conflict of interest that prevents counsel
for the indemnifying party from adequately representing the interests of the
indemnified party, (iii) the indemnifying party does not employ counsel that is
reasonably satisfactory to the indemnified party, or (iv) the indemnifying party
fails to assume the defense or does not reasonably contest such action in good
faith, in which case, if the indemnified party notifies the indemnifying party
that it elects to employ separate counsel, the indemnifying party shall not have
the right to assume the defense of such action on behalf of the indemnified
party and the reasonable fees and expenses of such separate counsel shall be
borne by the indemnifying party; provided, however, that the indemnifying party
shall not, in connection with any proceeding or related proceedings in the same
jurisdiction, be liable for the reasonable fees and expenses of more than one
separate firm (in addition to any local counsel) for all indemnified parties.

               (d)  The obligations of Weatherford and the Holders under this
Section 6.10 shall survive the completion of


                                      -18-
<PAGE>

any offering of Registrable Securities in a registration statement under this
Section 6.

          6.11.  REPORTS UNDER THE EXCHANGE ACT.  With a view to making
available to the Holders the benefits of Rule 144 and any other rule or
regulation of the SEC that may at any time permit a Holder to sell securities of
Weatherford to the public without registration or pursuant to a registration on
Form S-3, Weatherford agrees to:

               (a)  use its best efforts to make and keep public information
available, as those terms are understood and defined in Rule 144;

               (b)  use its best efforts to file with the SEC in a timely manner
all reports and other documents required under the Act and the Exchange Act; and


               (c)  furnish to any Holder forthwith upon request (i) a written
statement by Weatherford as to its compliance with the reporting requirements of
Rule 144, or as to whether it qualifies as a registrant whose securities may be
resold pursuant to Form S-3, (ii) a copy of the most recent annual or quarterly
report of Weatherford and such other reports and documents so filed by
Weatherford, and (iii) such other information as may be reasonably requested in
availing any Holder of any rule or regulation of the SEC which permits the
selling of any such securities without registration or pursuant to such form.

          6.12.  FORM S-3 REGISTRATION.  In case Weatherford shall receive from
any Holder or Holders of at least 10% of the Registrable Securities then
outstanding (or a lesser percent if the anticipated aggregate offering price,
net of discounts and commissions, would exceed $1,000,000) a written request or
requests that Weatherford effect a registration on Form S-3 not involving an
underwriting and any related qualification or compliance with respect to all or
a part of the Registrable Securities owned by such Holder or Holders,
Weatherford will:

               (a)  promptly give written notice of the proposed registration,
and any related qualification or compliance, to all other Holders; and

               (b)  as soon as practicable, effect such registration and all
such qualifications and compliances as may be so requested and as would permit
or facilitate the sale and distribution of all or such portion of such Holder's
or Holders' Registrable Securities as are specified in such request, together
with all or such portion of the Registrable Securities of any other Holder or
Holders joining in such request as are specified in a written request given
within 15 days after receipt of such written notice from Weatherford; provided,
however, that


                                      -19-
<PAGE>

Weatherford shall not be obligated to effect any such registration,
qualification or compliance, pursuant to this Section 6.12:  (1) if Form S-3 is
not available for such offering by the Holders; (2) if the Holders, together
with the holders of any other securities of Weatherford entitled to include
securities in such registration, propose to sell Registrable Securities and such
other securities (if any) at an aggregate price to the public (net of any
discounts or commissions) of less than $1,000,000; (3) if Weatherford shall
furnish to the Holders a certificate signed by the President of Weatherford
stating that in the good faith judgment of a majority of the directors of
Weatherford then in office who were not designated by the FRC Group, it would be
materially detrimental to Weatherford for such Form S-3 Registration to be
effected at such time, in which event Weatherford shall have the right to defer
the filing of the Form S-3 registration statement for a period of not more than
60 days after receipt of the request of the Holder or Holders under this Section
6.12; provided, however, that Weatherford shall not utilize this right more than
once in any 12-month period; (4) if Weatherford has, within the 12-month period
preceding the date of such request, already effected a registration on Form S-3
for the Holders pursuant to this Section 6.12; or (5) in any particular
jurisdiction in which Weatherford would be required to qualify to do business or
to execute a general consent to service of process in effecting such
registration, qualification or compliance.

               (c)  Subject to the foregoing, Weatherford shall file a
registration statement covering the Registrable Securities and other securities
so requested to be registered as soon as practicable after receipt of the
request or requests of the Holders.  All expenses incurred by or on behalf of
Weatherford in connection with the registrations requested pursuant to Section
6.12, including (without limitation) all registration, filing, qualification,
printer's and accounting fees and the fees and disbursements of counsel for
Weatherford, shall be borne by Weatherford, except that any discounts or
commissions associated with Registrable Securities and the fees and
disbursements of counsel for the selling Holder or Holders shall be borne by the
Holder or Holders participating in the Form S-3 Registration.  Registrations
effected pursuant to this Section 6.12 shall not be counted as demands for
registration or registrations effected pursuant to Sections 6.2.

          6.13.  NO ASSIGNMENT OF REGISTRATION RIGHTS.  The rights to cause
Weatherford to register Registrable Securities pursuant to this Section 6 may
only be assigned by a Holder to a transferee or assignee of any Registrable
Securities if (i) such transferee or assignee is a member of the FRC Group that
has executed this Agreement, and (ii) immediately following such transfer the
further disposition of such securities by the transferee or assignee is
restricted under the Act.


                                      -20-
<PAGE>

          6.14.  LIMITATIONS ON SUBSEQUENT REGISTRATION RIGHTS.  From and after
the date of this Agreement, Weatherford shall not, without the prior written
consent of the Holders of a majority of the outstanding Registrable Securities
(or, prior to the Effective Time of the Merger, without the prior written
consent of FRC), enter into any agreement with any holder or prospective holder
of any securities of Weatherford which would allow such holder or prospective
holder to include such securities in any registration filed under Sections 6.2
or 6.3 hereof, unless under the terms of such agreement, such holder or
prospective holder may include such securities in any such registration only to
the extent that the inclusion of its securities will not reduce the amount of
the Registrable Securities of the Holders which is included.

          6.15.  WAIVER PROCEDURES.  The observance by Weatherford of any
provision of this Section 6 may be waived (either generally or in a particular
instance and either retroactively or prospectively) with the written consent of
the holders of a majority of the Registrable Securities then outstanding, and
any waiver effected in accordance with this paragraph shall be binding upon each
Holder of Registrable Securities.

          6.16.  "MARKET STAND-OFF" AGREEMENT.  Any Holder of Registrable
Securities, if requested by an underwriter of any registered public offering of
Weatherford securities being sold in a firm commitment underwriting, agrees not
to sell or otherwise transfer or dispose of any Common Stock (or other
Weatherford Voting Securities) held by such Holder other than shares of
Registrable Securities included in the registration, during a period of up to 90
days following the effective date of the registration statement, provided that
all other persons selling securities in such underwritten public offering and
all officers and directors of Weatherford shall enter into similar agreements.
Such agreement shall be in writing in the form reasonably satisfactory to
Weatherford and such underwriter.  Weatherford may impose stop-transfer
instructions with respect to the securities subject to the foregoing restriction
until the end of the required stand-off period.

          Section 7.  TERM OF AGREEMENT; CERTAIN PROVISIONS REGARDING
TERMINATION.

               (a)  Except as otherwise provided in (b) below, the respective
covenants and agreements of the FRC Group and Weatherford contained in this
Agreement will continue in full force and effect until the Termination Date, and
all of the representations and warranties set forth herein shall be continuing
representations and warranties.  Upon the Termination Date, all of the
obligations of Weatherford and the FRC Group hereunder shall terminate, except
solely the obligations of the


                                      -21-
<PAGE>

parties pursuant to Section 6.10 in respect of registrations completed prior to
the Termination Date.

               (b)  If the FRC Group shall, at any time, sell or otherwise
dispose of Weatherford Voting Securities in compliance with the terms and
provisions of this Agreement so that the FRC Group beneficially owns in the
aggregate shares representing less than 10% of the Combined Voting Power, all
covenants, agreements, obligations and rights of the FRC Group and Weatherford
contained in Sections 4.2 (except that no single sale, transfer of any
beneficial interest in or other disposition of Weatherford Voting Securities,
and no related group of such sales, transfers or dispositions, shall be made by
the FRC Group if such sales, transfers or dispositions (i) involve such number
of Weatherford Voting Securities as represent 5% or more of the Combined Voting
Power, or (ii) are to or with any one person or related group of persons who,
upon consummation of such sale, transfer or disposition have beneficial
ownership of such number of Weatherford Voting Securities as represent 10% or
more of the Combined Voting Power), 4.3, 4.4, 4.5, 4.7, 5, 6 and 8 hereof shall
cease until such time as the FRC Group shall again purchase or otherwise acquire
beneficial ownership of Weatherford Voting Securities representing 10% or more
of the Combined Voting Power.  From and after such times as the FRC Group
beneficially owns in the aggregate Weatherford Voting Securities representing
10% or more of the Combined Voting Power, all restrictions upon and covenants of
the FRC Group and Weatherford set forth in this Agreement shall again be
applicable until the Termination Date.  All percentages in this Section shall be
calculated in accordance with the provisions of Section 4.1.

          Section 8.  LEGEND AND STOP TRANSFER ORDER.  To assist in effectuating
the provisions of this Agreement, the FRC Group hereby consents (i) to the
placement, in connection with the Merger or otherwise within 10 business days
after any Weatherford Voting Securities become subject to the provisions of this
Agreement, of the following legend on all certificates representing ownership of
Weatherford Voting Securities owned of record by any member of the FRC Group or
by any person where a member of the FRC Group is the beneficial owner thereof,
until such shares are sold, transferred or disposed in a manner permitted hereby
to a person who is not then a member of the FRC Group:

          The shares represented by this certificate are subject to
          the provisions of an Agreement among Weatherford
          Corporation, First Reserve Corporation and certain limited
          partnerships under control of or common control with First
          Reserve Corporation, and may not be sold, transferred,
          pledged, hypothecated or otherwise disposed of except in
          accordance


                                      -22-
<PAGE>

           therewith.  Copies of said Agreement are on file at the office of
           the Corporate Secretary of Weatherford Corporation.

; and (ii) to the entry of stop transfer orders with the transfer agent or
agents of Weatherford Voting Securities against the transfer of Weatherford
Voting Securities except in compliance with the requirements of this Agreement,
or if Weatherford acts as its own transfer agent with respect to any Weatherford
Voting Securities, to the refusal by Weatherford to transfer any such securities
except in compliance with the requirements of this Agreement.  Weatherford
agrees to remove promptly all legends and stop transfer orders with respect to
the transfer of Weatherford Voting Securities being made to a person who is not
then a member of the FRC Group in compliance with the provisions of this
Agreement.

          Section 9.  REMEDIES.

               (a)  The FRC Group acknowledges and agrees that (i) the
provisions of this Agreement are reasonable and necessary to protect the proper
and legitimate interests of the parties hereto, and (ii) Weatherford and the FRC
Group would be irreparably damaged in the event any of the provisions of this
Agreement were not performed by the other parties hereto in accordance with
their specific terms or were otherwise breached.  It is accordingly agreed that
the non-breaching party shall be entitled to preliminary and permanent
injunctive relief to prevent breaches of the provisions of this Agreement,
without the necessity of proving actual damages or of posting any bond, and to
enforce specifically the terms and provisions hereof and thereof in any court of
the United States or any state thereof having jurisdiction, which rights shall
be cumulative and in addition to any other remedy to which such non-breaching
party may be entitled hereunder or at law or equity.

               (b)  In addition to any other remedy Weatherford may have under
this Agreement or in law or equity, if the FRC Group shall acquire or transfer
any Weatherford Voting Securities in violation of this Agreement, such
Weatherford Voting Securities which are in excess of the number permitted to be
owned or controlled by the FRC Group or which have been transferred by the FRC
Group in violation of the provisions of this Agreement may not be voted by the
owner thereof or any proxy therefor.

          10.  GENERAL PROVISIONS.

          10.1.     CONSENT TO JURISDICTION; SERVICE OF PROCESS. THIS AGREEMENT
SHALL BE GOVERNED BY AND INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF DELAWARE WITHOUT GIVING EFFECT TO ANY CONFLICTS OF LAW PROVISIONS.
EACH OF THE


                                      -23-
<PAGE>

PARTIES IRREVOCABLY AND UNCONDITIONALLY (A) AGREES THAT ANY SUIT, ACTION OR
OTHER LEGAL PROCEEDING (COLLECTIVELY, "SUIT") ARISING OUT OF THIS AGREEMENT
SHALL BE BROUGHT AND ADJUDICATED IN THE UNITED STATES DISTRICT COURT FOR
DELAWARE, OR, IF SUCH COURT WILL NOT ACCEPT JURISDICTION, IN ANY COURT OF
COMPETENT CIVIL JURISDICTION SITTING IN NEW CASTLE COUNTY, DELAWARE, (B) SUBMITS
TO THE JURISDICTION OF ANY SUCH COURT FOR THE PURPOSES OF ANY SUCH SUIT AND (C)
WAIVES AND AGREES NOT TO ASSERT BY WAY OF MOTION, AS A DEFENSE OR OTHERWISE IN
ANY SUCH SUIT, ANY CLAIM THAT IT IS NOT SUBJECT TO THE JURISDICTION OF THE ABOVE
COURTS, THAT SUCH SUIT IS BROUGHT IN AN INCONVENIENT FORUM OR THAT THE VENUE OF
SUCH SUIT IS IMPROPER.  EACH OF THE PARTIES ALSO IRREVOCABLY AND UNCONDITIONALLY
CONSENTS TO THE SERVICE OF ANY PROCESS, PLEADINGS, NOTICES OR OTHER PAPERS IN A
MANNER PERMITTED BY THE NOTICE PROVISIONS OF SECTION 10.3 HEREOF.

          10.2.     JOINT AND SEVERAL OBLIGATIONS.  All of the obligations of
the FRC Group hereunder shall be joint and several.  Each member of the FRC
Group that shall become or have the right to become the beneficial owner, within
the meaning and scope of Section 4.1 hereof, of Weatherford Voting Securities
shall, within 10 days of becoming such owner or holder, execute and deliver to
Weatherford a joinder agreement, agreeing to be legally bound by this Agreement
to the same extent as if named as a member of the FRC Group herein.

          10.3.     NOTICES.  All notices, consents, requests, instructions,
approvals and other communications provided for herein and all legal process in
regard hereto shall be in writing and shall be decreed to be validly given, made
or served when delivered personally or deposited in the U.S. mail, postage
prepaid, for delivery by express, registered or certified mail, or delivered to
a recognized overnight courier service, addressed as follows:


          If to Weatherford:

               Weatherford International Incorporated
               1360 Post Oak Boulevard, Suite 1000
               Houston, Texas 77056-3098
               Attn:  Chairman, President and
                      Chief Executive Officer

          With a required copy to:

               Fulbright & Jaworski L.L.P.
               1301 McKinney, Suite 5100
               Houston, Texas  77010-3095
               Attn:  Charles L. Strauss, Esq.


                                      -24-
<PAGE>

          If to any member of the First Reserve Group:

               First Reserve Corporation
               475 Steamboat Road
               Greenwich, Connecticut 06830
               Attn:  President and Chief Executive Officer

          With a required copy to:

               Simpson Thacher & Bartlett
               425 Lexington Avenue
               New York, New York 10017-3909
               Attn:  Robert L. Friedman, Esq.

or to such other address as may be specified on a notice given pursuant to this
Section 10.3.

          10.4.     SEVERABILITY.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid, void, or unenforceable, the remainder of the terms, provisions,
covenants and restrictions shall remain in full force and effect and shall in no
way be affected, impaired or invalidated.  The parties agree that they will use
their best efforts at all times to support and defend this Agreement.

          10.5.     AMENDMENTS.  This Agreement may be amended only by an
agreement in writing signed by each of the parties hereto; provided, however,
that any amendment executed by Weatherford must prior thereto be approved by a
majority of the directors of Weatherford then in office who were not designated
by the FRC Group.

          10.6.     DESCRIPTIVE HEADINGS.  Descriptive headings are for
convenience only and shall not control or affect the meaning or construction of
any provision of this Agreement.

          10.7.     COUNTERPARTS.  This Agreement shall become binding when one
or more counterparts hereof, individually or taken together, bears the
signatures of each of the parties hereto.  This Agreement may be executed in any
number of counterparts, each of which shall be an original as against the party
whose signature appears thereon, or on whose behalf such counterpart is
executed, but all of which taken together shall be one and the same statement.

          10.8.     SUCCESSORS AND ASSIGNS.  This Agreement shall be binding
upon and inure to the benefit of and be enforceable by the successors and
assigns of the parties hereto.


                                      -25-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto intending to be legally bound
have duly executed this Agreement, all as of the day and year first above
written.

                              WEATHERFORD INTERNATIONAL
                                   INCORPORATED


                              By: /s/ Philip Burguieres
                                 ----------------------
                                 Philip Burguieres
                                 Chairman, President and
                                 Chief Executive Officer



                              FIRST RESERVE CORPORATION


                              By: /s/ William E. Macaulay
                                 ------------------------
                                 William E. Macaulay
                                 President and Chief
                                 Executive Officer

NUMBER OF SHARES OF           FIRST RESERVE FUNDS:
ENTERRA COMMON STOCK
HELD ON THE DATE HEREOF:

  1,993,529                   AMERICAN GAS & OIL INVESTORS,
                                LIMITED PARTNERSHIP
  1,233,907                   AMGO II, LIMITED PARTNERSHIP
    597,408                   AMGO III, LIMITED PARTNERSHIP
  2,323,562                   FIRST RESERVE SECURED ENERGY ASSETS
                                FUND, LIMITED PARTNERSHIP
  3,355,254                   FIRST RESERVE FUND V, LIMITED
                                PARTNERSHIP
    838,427                   FIRST RESERVE FUND V-2, LIMITED
                                PARTNERSHIP
    870,262                   FIRST RESERVE FUND VI, LIMITED
                                PARTNERSHIP

                              By:  FIRST RESERVE CORPORATION,
                                   Managing General Partner
                                   of each of the First Reserve
                                   Funds


                                   By: /s/ William E. Macaulay
                                      ------------------------
                                      William E. Macaulay
                                      President and
                                      Chief Executive Officer


                                      -26-

<PAGE>

             [Letterhead of Fulbright & Jaworski L.L.P.]


August 28, 1995



Weatherford International Incorporated
1360 Post Oak Boulevard, Suite 1000
Houston, Texas 77056-3098

Ladies and Gentlemen:

  We have acted as counsel for Weatherford International Incorporated, a
Delaware corporation (the "Company"), in connection with the registration
under the Securities Act of 1933, as amended (the "Act"), of 24,100,000
shares (the "Shares") of the Company's common stock, $.10 par value, to be
issued upon the terms and subject to the conditions set forth in the Joint
Proxy Statement/Prospectus contained in the Registration Statement on Form
S-4 (the "Registration Statement") relating thereto to be filed with the
Securities and Exchange Commission by the Company on August 29, 1995.  The
Shares are to be issued in connection with the merger (the "Merger") of
Enterra Corporation, a Delaware corporation ("Enterra"), with and into the
Company, pursuant to an Agreement and Plan of Merger dated June 23, 1995, as
amended (the "Merger Agreement"), between Enterra and the Company.

  In connection therewith, we have examined originals or copies certified or
otherwise identified to our satisfaction of the Registration Statement, the
Merger Agreement, the Restated Certificate of Incorporation of the Company,
the By-laws of the Company, the corporate proceedings with respect to the
Merger and the proposed issuance of the Shares and such other documents and
instruments as we have deemed necessary or appropriate for the expression of
the opinions contained herein.

  We have assumed the authenticity and completeness of all records,
certificates and other instruments submitted to us as originals, the
conformity to original documents of all records, certificates and other
instruments submitted to us as copies, the authenticity and completeness of
the originals of those records, certificates and other instruments submitted
to us as copies and the correctness of all statements of fact contained in
all records, certificates and other instruments that we have examined.

  Based on the foregoing, and having regard for such legal considerations as
we have deemed relevant, we are of the opinion that the Shares proposed to be
issued by the Company in connection with the Merger have been duly authorized
for issuance and, when issued in accordance with the terms of the Merger
Agreement, will be validly issued, fully paid and nonassessable.

<PAGE>

Weatherford International Incorporated
August 28, 1995
Page 2

  The foregoing opinion is limited to the federal laws of the United States
of America, the laws of the State of Texas and the General Corporation Law of
the State of Delaware, and we are expressing no opinion as to the effect of
the laws of any other jurisdiction.

  This opinion is rendered solely for the benefit of the Company and is not
to be used, circulated, copied, quoted or referred to without our prior
written consent.  We hereby consent to the filing of this opinion as an
exhibit to the Registration Statement and to the reference to our firm under
the caption "Legal Matters" in the Joint Proxy Statement/Prospectus contained
in the Registration Statement.

                                               Very truly yours,



                                               Fulbright & Jaworski L.L.P.




<PAGE>

                  [Letterhead of Fulbright & Jaworski L.L.P.]


August 28, 1995



Weatherford International Incorporated
1360 Post Oak Boulevard, Suite 1000
Houston, Texas  77056-3098

Ladies and Gentlemen:

  We have acted as counsel for Weatherford International Incorporated, a
Delaware corporation (the "Company"), in connection with the registration
under the Securities Act of 1933, as amended, of 24,100,000 shares (the
"Shares") of the Company's common stock, $.10 par value, to be issued upon
the terms and subject to the conditions set forth in the Joint Proxy
Statement/Prospectus (the "Joint Proxy Statement/Prospectus") contained in
the Registration Statement on Form S-4 (the "Registration Statement")
relating thereto to be filed with the Securities and Exchange Commission by
the Company on August 29, 1995.  The Shares are to be issued in connection
with the merger (the "Merger") of Enterra Corporation, a Delaware corporation
("Enterra"), with and into the Company.  In this connection, we have assisted
in the preparation of the description of the United States federal income tax
consequences of the Merger to the Company, Enterra and the stockholders of
Enterra contained in the Joint Proxy Statement/Prospectus under the caption
entitled "Certain U.S. Federal Income Tax Consequences" (the "Tax Summary").

  In connection with this opinion, we have reviewed the Joint Proxy
Statement/Prospectus and we have assumed that all facts described therein are
true, accurate and complete.  Based upon the assumptions set forth herein,
such legal considerations as we deem relevant and other qualifications
contained in this letter, it is our opinion that the discussion and the legal
conclusions set forth in the Tax Summary are accurate and complete in all
material respects and address all material United States federal income tax
considerations with respect to the matters set forth therein.

  The opinion expressed herein is based upon the Internal Revenue Code of
1986, as amended, Treasury regulations (including proposed regulations),
judicial authority and administrative rulings and practice.  There can be no
assurance that the Internal Revenue Service ("IRS") will not take a contrary
view, and no ruling from the IRS has been or will be sought.  Legislative,
judicial or administrative changes or interpretations may be forthcoming that
could alter or modify the statements and conclusions set forth herein.  Any
such changes or interpretations may or may not be retroactive and could
affect the tax consequences to the Company, Enterra and the stockholders of
Enterra.

<PAGE>

Weatherford International Incorporated
August 28, 1995
Page 2

  Our opinion is limited to the specific conclusions with respect to the
United States federal income tax consequences set forth in the Tax Summary,
and no other opinions are expressed or implied.  Specifically, no opinions
are expressed as to state, local or foreign tax consequences or United States
federal estate or gift tax consequences.

  This opinion is rendered solely for the benefit of the Company and is not
to be used, circulated, copied, quoted or referred to without our prior
written consent.  We hereby consent to the filing of this opinion as an
exhibit to the Registration Statement and the reference to our firm in the
Tax Summary.

                                              Very truly yours,



                                              Fulbright & Jaworski L.L.P.






<PAGE>

                                                             EXHIBIT 10.1

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Philip Burguieres (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $630,000 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Philip Burguieres
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and James R. Burke (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $182,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ James R. Burke
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and M. E. Eagles (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $245,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ M. E. Eagles
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Norman W. Nolen (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $155,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Norman W. Nolen
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Suzanne Thomas (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $155,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ Philip Burguieres
                                               --------------------------------
                                        Name:  Philip Burguieres
                                               --------------------------------



                                        /s/ H. Suzanne Thomas
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and James D. Green (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $67,200 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ James D. Green
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Gay S. Mayeux
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $53,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Gay S. Mayeux
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Jon Nicholson (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of December 9, 1993, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $57,504 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Jon Nicholson
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               SECOND AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This Second Amendment by and between Weatherford International
Incorporated, a Delaware corporation ("Weatherford"), and Weldon W. Walker (the
"Executive"), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of June 1, 1994, as amended by that certain First
Amendment to Change of Control Agreement (collectively, the "Agreement"),
establishing various matters related to the Executive's compensation and
benefits in the event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $60,480 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."


                                      - 1 -

<PAGE>

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Weldon W. Walker
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               FIRST AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This First Amendment by and between Weatherford International Incorporated,
a Delaware corporation ("Weatherford"), and Philip D. Gardner (the "Executive),
dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of February 13, 1995 (the "Agreement"), establishing
various matters related to the Executive's compensation and benefits in the
event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $42,570 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.


                                      - 1 -

<PAGE>

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this First Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Philip D. Gardner
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                               FIRST AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This First Amendment by and between Weatherford International Incorporated,
a Delaware corporation ("Weatherford"), and Robert A. Seekely (the "Executive),
dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of February 13, 1995 (the "Agreement"), establishing
various matters related to the Executive's compensation and benefits in the
event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $50,004 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.


                                      - 1 -

<PAGE>

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this First Amendment
as of the day and year first above written.

                              WEATHERFORD INTERNATIONAL
                              INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Robert A. Seekely
                                        ---------------------------------------
                                        Executive

'                                     - 2 -

<PAGE>

                               FIRST AMENDMENT TO
                           CHANGE OF CONTROL AGREEMENT


     This First Amendment by and between Weatherford International Incorporated,
a Delaware corporation ("Weatherford"), and Frederick T. Tilton (the
"Executive), dated as of August 28, 1995.

                                    RECITALS:
                                    --------

     A.   Weatherford and the Executive have entered into that certain Change of
Control Agreement dated as of February 13, 1995 (the "Agreement"), establishing
various matters related to the Executive's compensation and benefits in the
event of a Change of Control (as defined in the Agreement).

     B.   The parties have agreed to amend certain provisions of the Agreement,
but only upon consummation of the merger (the "Merger") of Weatherford and
Enterra Corporation, a Delaware corporation ("Enterra"), and payment to the
Executive of certain amounts.

     NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

          1.   At the closing (the "Closing") of the transactions contemplated
     by the Agreement and Plan of Merger dated as of June 23, 1995, as amended
     by Amendment No. 1 to Agreement and Plan of Merger dated as of August 28,
     1995, between Weatherford and Enterra, Weatherford shall pay the Executive
     $52,800 (the "Payment").

          2.   Effective at the Closing, Subsection 5(c) shall be amended by
     deleting the last sentence of the last paragraph.

          3.   Effective at the Closing, Subsection 6(d) shall be amended by
     adding the following proviso to the end of the second sentence:

               "; PROVIDED, HOWEVER, that if the Executive voluntarily
               terminates employment for any reason during the 30-day period
               immediately following the first anniversary to the Effective
               Date, the Executive also shall be entitled to the benefits set
               forth in Section 6(a)(iv) of this Agreement."

          4.   The Executive hereby acknowledges that the Payment constitutes
     good, valuable and adequate consideration for the amendments to the
     Agreement made hereby.


                                     - 1 -

<PAGE>

          5.   The remainder of the Agreement shall remain in full force and
     effect as written.

     IN WITNESS WHEREOF, the parties hereto have executed this First Amendment
as of the day and year first above written.

                                        WEATHERFORD INTERNATIONAL
                                        INCORPORATED


                                        By:    /s/ H. Suzanne Thomas
                                               --------------------------------
                                        Name:  H. Suzanne Thomas
                                               --------------------------------



                                        /s/ Frederick T. Tilton
                                        ---------------------------------------
                                        Executive


                                      - 2 -

<PAGE>

                                                                  EXHIBIT 23.1


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



           As independent public accountants, we hereby consent to the
           incorporation by reference in this registration statement on
           Form S-4 of our reports dated March 10, 1995, included in
           Weatherford International Incorporated's Form 10-K for the year
           ended December 31, 1994 and to all references to our firm
           included in this registration statement.


           Arthur Andersen LLP

           Houston, Texas
           August 28, 1995

<PAGE>

                                                                    EXHIBIT 23.2





We consent to the use of our report incorporated herein by reference and to the
reference to our firm under the heading "Experts" in the prospectus.


                                             KPMG PEAT MARWICK LLP



Houston, Texas
August 28, 1995


<PAGE>

                                                                    EXHIBIT 23.3



     We consent to the reference to our firm under the caption  "Experts" and to
the use of our report dated March 15, 1994 with respect to the consolidated
financial statements of Total Energy Services Company included in the
Registration Statement (Form S-4 No. 33-80714) of Enterra Corporation which is
incorporated by reference in the Registration Statement on Form S-4 of
Weatherford International Incorporated and the related Joint Proxy
Statement/Prospectus of Weatherford International Incorporated and Enterra
Corporation.




                                        Ernst & Young LLP



Houston, Texas
August 28, 1995


<PAGE>

                                                                    EXHIBIT 23.4




                       CONSENT OF INDEPENDENT ACCOUNTANTS


     We consent to the incorporation by reference in the registration statement
of Weatherford International Incorporated on Form S-4 of our report dated
December 16, 1994, except as to Note 12 as to which the date is August 24, 1995,
on our audit of the combined financial statements of Zapata Energy Industries as
of and for the eleven months ended September 30, 1994, which report is included
in this Form 8-K.




                                             Coopers & Lybrand L.L.P.

Houston, Texas
August 28, 1995


<PAGE>
                                     PROXY
                         WEATHERFORD INTERNATIONAL INCORPORATED
                   SPECIAL MEETING OF STOCKHOLDERS -- OCTOBER 5, 1995
              THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

            The  undersigned holder of Common Stock of Weatherford International
        Incorporated ("Weatherford") hereby  appoints Philip  Burguieres and  H.
        Suzanne Thomas, or either of them, his or her proxies with full power of
        substitution,  to  vote  at  the  Special  Meeting  of  Stockholders  of
        Weatherford to be  held on  Thursday, October  5, 1995,  at 10:30  a.m.,
        Houston time, at The Ritz-Carlton, 1919 Briar Oaks Lane, Houston, Texas,
        and at any adjournment thereof, the number of votes that the undersigned
        would  be entitled to cast if  personally present, on all matters coming
        before the meeting.

<TABLE>
<S>        <C>
(1)        Proposal to approve and adopt the  Agreement and Plan of Merger dated  as of June 23, 1995, as  amended,
           between  Weatherford  and Enterra  Corporation  ("Enterra"), and  the merger  of  Enterra with  and into
           Weatherford, pursuant to which each outstanding share of Enterra common stock, $1.00 par value, will  be
           converted  into  the  right  to  receive  1.69  shares  of  Weatherford  common  stock,  $.10  par value
           ("Weatherford Common Stock"), before giving effect to the reverse stock split described below (0.845  of
           a share of Weatherford Common Stock after giving effect to the reverse stock split).
           FOR  / /                 AGAINST  / /                 ABSTAIN  / /
(2)        Proposal  to approve and adopt amendments to  Weatherford's Restated Certificate of Incorporation (i) to
           effect a contemporaneous one-for-two reverse stock split of Weatherford Common Stock and (ii) to  change
           Weatherford's name to "Weatherford Enterra, Inc."
           FOR  / /                 AGAINST  / /                 ABSTAIN  / /
</TABLE>

           PLEASE MARK, DATE, SIGN AND RETURN IN THE ENCLOSED ENVELOPE, WHICH
                  REQUIRES NO POSTAGE IF MAILED IN THE UNITED STATES.

                       (CONTINUED AND TO BE SIGNED ON OTHER SIDE)
<PAGE>

<TABLE>
<S>        <C>
(3)        Proposal to amend Weatherford's 1991 Stock Option Plan.
           FOR  / /                 AGAINST  / /                 ABSTAIN  / /
(4)        Proposal to amend Weatherford's Restricted Stock Incentive Plan.
           FOR  / /                 AGAINST  / /                 ABSTAIN  / /
(5)        TO  CONSIDER AND  TAKE ACTION UPON  ANY OTHER MATTER  THAT MAY PROPERLY  COME BEFORE THE  MEETING OR ANY
           ADJOURNMENT THEREOF.
</TABLE>

    All as more particularly described  in the Joint Proxy  Statement/Prospectus
dated  August 31,  1995 relating  to such  meeting, receipt  of which  is hereby
acknowledged.

    This proxy  when properly  executed will  be voted  in the  manner  directed
herein  by the  undersigned stockholder. If  no directions are  made, this proxy
will be voted for Proposals 1, 2, 3 and 4.

                                              ----------------------------------

                                              ----------------------------------
                                                 Signature of Stockholder(s)

                                              Please sign your  name exactly  as
                                              it  appears  hereon.  Joint owners
                                              must each  sign. When  signing  as
                                              attorney, executor, administrator,
                                              trustee  or guardian,  please give
                                              your  full  title  as  it  appears
                                              hereon.

                                              Date:
                                              ----------------------------------
                                              , 1995

<PAGE>
P R O X Y                         ENTERRA CORPORATION
                         13100 NORTHWEST FREEWAY, SIXTH FLOOR
                                 HOUSTON, TEXAS 77040
             PROXY FOR SPECIAL MEETING OF STOCKHOLDERS -- OCTOBER 5, 1995

           THIS  PROXY  IS SOLICITED  ON  BEHALF OF  THE  BOARD OF  DIRECTORS OF
       ENTERRA CORPORATION. The undersigned hereby appoints Steven C. Grant  and
       Steven  W. Krablin, or  either of them, with  full power of substitution,
       the proxy or proxies of the undersigned to attend the Special Meeting  of
       Stockholders  of Enterra Corporation  to be held  on Thursday, October 5,
       1995, or any adjournment  thereof, to vote the  shares of stock that  the
       undersigned  would be entitled to vote if personally present as indicated
       below and to  represent and vote  such shares of  the undersigned on  any
       other  matters properly  brought before the  Special Meeting,  all as set
       forth in the  August 31,  1995 Joint Proxy  Statement/Prospectus and  any
       supplements thereto.

           THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE FOR THE PROPOSAL
                                   DESCRIBED BELOW.

        1. Approval  and adoption of the Agreement  and Plan of Merger, dated as
           of June  23,  1995,  as amended,  between  Weatherford  International
           Incorporated  and  Enterra  Corporation, the  merger  to  be effected
           pursuant thereto and all related transactions.

                      FOR  / /       AGAINST  / /       ABSTAIN  / /

                  (CONTINUED AND TO BE SIGNED ON REVERSE SIDE)
<PAGE>
    The shares of stock of the undersigned will be voted in the manner  directed
herein  by the  undersigned stockholder. IF  NO DIRECTION IS  GIVEN, SUCH SHARES
WILL BE VOTED "FOR" PROPOSAL 1. IF ANY OTHER MATTERS SHOULD PROPERLY COME BEFORE
THE SPECIAL MEETING, SUCH SHARES WILL BE  VOTED WITH RESPECT TO SUCH MATTERS  IN
ACCORDANCE WITH THE JUDGMENT OF THE PERSONS VOTING SUCH PROXIES. The undersigned
hereby acknowledges receipt of the Notice of the Special Meeting of Stockholders
and the related Joint Proxy Statement/Prospectus.

    Please  sign exactly as  name appears below.  When shares are  held by joint
tenants, both should  sign. When signing  as attorney, executor,  administrator,
trustee  or guardian, please give  full title as such.  If a corporation, please
sign in full corporate name by the  President or other authorized officer. If  a
partnership, please sign in the partnership name by an authorized person.

  PLEASE MARK, DATE AND SIGN THIS PROXY CARD AND PROMPTLY RETURN IT USING THE
                               ENCLOSED ENVELOPE.
                                              DATED ______________________, 1995
                                              __________________________________
                                                          SIGNATURE
                                              __________________________________
                                                  Signature if held jointly


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