WEATHERFORD ENTERRA INC
SC 13D/A, 1998-03-05
EQUIPMENT RENTAL & LEASING, NEC
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<PAGE>   1

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                      
                                      
   
                                 SCHEDULE 13D/A
                                AMENDMENT NO. 4
    
                                      
                  UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                      

                           Weatherford Enterra, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                     Common Stock, Par Value $.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   947071106
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

               c/o First Reserve Corporation, 475 Steamboat Road,
                              Greenwich, CT 06830
                                 (203) 661-6601
- --------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)


   
                                 March 4, 1998
- --------------------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)
    


If the filing person has previously filed a statement on Schedule 13G to report 
the acquisition which is the subject of this Statement because of 
Rule 13d-1(b)(3) or (4), check the following box:  [ ]

Check the following box if a fee is being paid with the statement: [ ]



<PAGE>   2

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    First Reserve Corporation
    I.R.S. No.: 06-1210123
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [ ]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           6,569,306
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    6,569,306
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     6,569,306
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

     12.50%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     CO
- --------------------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
                                      
                                      
                                                                   PAGE 2 OF 12
<PAGE>   3

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    American Gas & Oil Investors, Limited Partnership
    I.R.S. No.: 13-3077100
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    New York

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           1,360,000
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    1,360,000
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,360,000
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

     2.59% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
                                      

                                                                   PAGE 3 OF 12
<PAGE>   4

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    AmGO II, Limited Partnership
    I.R.S. No.: 13-3149992
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a [ ]
                                                                         (b [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    New York

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           850,000    
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    850,000    
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     850,000    
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

     1.62% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


                                                                   PAGE 4 OF 12
<PAGE>   5

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    First Reserve Secured Energy Assets Fund, Limited Partnership
    I.R.S. No.: 06-1232433
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware 

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           650,000    
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    650,000    
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     650,000    
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 

     1.24% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


                                                                   PAGE 5 OF 12
<PAGE>   6

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    First Reserve Fund V, Limited Partnership
    I.R.S. No.: 06-1295657
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           2,300,000  
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    2,300,000  
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,300,000  
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11  

     4.38% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


                                                                   PAGE 6 OF 12
<PAGE>   7

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    First Reserve Fund V-2, Limited Partnership
    I.R.S. No.: 06-6351960
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           640,000    
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    640,000    
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     640,000    
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11  

     1.22% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


                                                                   PAGE 7 OF 12
<PAGE>   8

CUSIP NO. 947071106               SCHEDULE 13D/A
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    First Reserve Fund VI, Limited Partnership
    I.R.S. No.: 06-1334650
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a  [ ]
                                                                         (b  [X]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

    N/A
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
    TO ITEMS 2(d) OR 2(e)                                                    [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           735,371    
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH            
 REPORTING          0
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    735,371    
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
     
                    0
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     735,371    
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES*                                                         [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11  

     1.40% 
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     PN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.


                                                                   PAGE 8 OF 12

<PAGE>   9
ITEM 1.   SECURITY AND ISSUER.

     This Statement on Schedule 13D (the "Schedule 13D"), filed pursuant to Rule
13d-1 of the Rules and Regulations under the Securities Exchange Act of 1934, as
amended, by American Gas & Oil Investors, Limited Partnership ("Fund I"), AmGO
II, Limited Partnership ("Fund II"), First Reserve Secured Energy Assets Fund,
Limited Partnership ("Fund IV"), First Reserve Fund V, Limited Partnership
("Fund V"), First Reserve Fund V-2, Limited Partnership ("Fund V-2") and First
Reserve Fund VI, Limited Partnership ("Fund VI", and together with Fund I, Fund
II, Fund IV, Fund V and Fund V-2, the "Funds") and by First Reserve Corporation
("First Reserve") with respect to the common shares ("the Shares") of
Weatherford Enterra, Inc., a Delaware corporation (the "Issuer"), is hereby
supplemented and amended as set forth below.

   
ITEM 4. PURPOSE OF TRANSACTION

     Item 4 is hereby amended by adding the following:

     As described in Item 6 below, First Reserve and each of the Funds entered
into a Voting Agreement with EVI, Inc. ("EVI") on March 4, 1998.  First Reserve
and the Funds entered into the Voting Agreement as a condition to EVI entering
into a Merger Agreement, dated March 4, 1998, with the Issuer (the "Merger 
Agreement").

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS

     Item 6 is hereby amended by adding the following:

     On March 4, 1997, First Reserve and each of the Funds entered into the
Voting Agreement. The Voting Agreement, among other things, requires First
Reserve and each of the Funds to vote their shares in favor of the Merger
Agreement at any meeting of Weatherford stockholders where the adoption of the
Merger Agreement is being voted upon unless, at the time of such meeting the 
Board of Directors of Weatherford, pursuant to the terms of the Merger 
Agreement, is recommending that Stockholders vote for a superior proposal.  
A copy of the Voting Agreement is attached hereto as Exhibit D.

ITEM 7. EXHIBITS

     Item 7 is hereby amended by adding the following:

     Exhibit D      Form of Voting Agreement dated March 4, 1998.
    

   
     Schedule I, attached to the 13D filed on October 11, 1995, and incorporated
therein by reference, is hereby amended to replace the list of executive
officers and directors of First Reserve Corporation with the following:

          William E. Macaulay
          President and Chief Executive Officer, Managing Director and Director

          John A. Hill
          Chairman, Managing Director and Director

          David H. Kennedy
          Managing Director and Director

          Johnathan S. Linker
          Managing Director

          Bruce M. Rothstein
          Managing Director

          Thomas R. Denison
          Managing Director, Assistant Secretary and General Counsel

          Elizabeth C. Foley
          Managing Director, Chief Financial Officer, Treasurer and Secretary

          Cathleen M. Ellsworth
          Managing Director
    
          

                                   SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Statement is true, complete and
correct.

   
Dated:    March 5, 1998
    

                                        First Reserve Corporation

   
                                        By:     /s/ Thomas R. Denison
                                                ----------------------
                                        Name:   Thomas R. Denison
                                        Title:  Managing Director
    


                                                                   Page 9 of 12
<PAGE>   10
          American Gas & Oil Investors, Limited Partnership

          By:  First Reserve Corporation,
               as Managing General Partner



   
               By:     /s/ Thomas R. Denison
                       --------------------------
               Name:   Thomas R. Denison
               Title:  Managing Director
    


          AmGO II, Limited Partnership

          By:  First Reserve Corporation,
               as Managing General Partner



   
               By:     /s/ Thomas R. Denison
                       --------------------------
               Name:   Thomas R. Denison
               Title:  Managing Director
    


          First Reserve Secured Energy Assets Fund, Limited Partnership

          By:  First Reserve Corporation,
               as Managing General Partner



   
               By:     /s/ Thomas R. Denison
                       --------------------------
               Name:   Thomas R. Denison
               Title:  Managing Director
    

           First Reserve Fund V, Limited Partnership

           By: First Reserve Corporation,
               as Managing General Partner



   
               By:     /s/ Thomas R. Denison
                       --------------------------
               Name:   Thomas R. Denison
               Title:  Managing Director
    





                                                                Page 10 of 12
<PAGE>   11
          First Reserve Fund V-2, Limited Partnership

          By:   First Reserve Corporation,
                as Managing General Partner



   
                By:    /s/ Thomas R. Denison
                       -----------------------------
                Name:  Thomas R. Denison
                Title: Managing Director
    

          First Reserve Fund VI, Limited Partnership

          By:   First Reserve Corporation,
                as Managing General Partner



   
                By:    /s/ Thomas R. Denison
                       ----------------------------
                Name:  Thomas R. Denison
                Title: Managing Director
    








                                                                 Page 11 of 12
<PAGE>   12
   
                                EXHIBIT INDEX
    

   
<TABLE>
<CAPTION>
Exhibit
Number          Description
- -------         -----------
   <S>          <C>
   D            Form of Voting Agreement dated March 4, 1998.
</TABLE>
    




                                                                  Page 12 of 12


<PAGE>   1

                           FIRST RESERVE CORPORATION

                                 March 4, 1998


EVI, Inc.
5 Post Oak Park, Suite 1760
Houston, TX 77027
Attention:       Bernard J. Duroc-Danner
                 President and Chief Executive Officer


         Reference is made to the Agreement and Plan of Merger between
Weatherford Enterra, Inc. ("Weatherford") and EVI, Inc. ("EVI") dated March 4,
1998 (the "Agreement"), which provides for the merger of Weatherford with and
into EVI (the "Merger").  As an inducement to, and in consideration of, EVI's
entering into the Agreement, the undersigned covenants and agrees as follows:

         (i)     At any meeting of the stockholders of Weatherford at which the
                 adoption of the Agreement is to be voted upon, the undersigned
                 will vote any voting securities of Weatherford over which the
                 undersigned has voting authority in favor of adoption of the
                 Agreement unless the Board of Directors of Weatherford is
                 recommending, at the time of such meeting, that the
                 stockholders of Weatherford vote against such adoption in view
                 of the pendency of a superior proposal as provided in Section
                 8.2(b) of the Agreement.

         (ii)    The undersigned will not directly or indirectly (a) solicit,
                 initiate or encourage the submission of any takeover proposal
                 (as defined in the Agreement) with respect to Weatherford, (b)
                 enter into any agreement with respect to a takeover proposal
                 with respect to Weatherford or (c) participate in any
                 discussion or negotiation 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 takeover proposal with respect to Weatherford; provided
                 that the foregoing clause (c) shall not prohibit any affiliate
                 of the undersigned who serves as a director of Weatherford
                 from acting (subject to Section 8.2 of the Agreement) solely
                 in his capacity as a director of Weatherford.

         (iii)   The undersigned will not sell, contract to sell or otherwise
                 transfer or dispose of any voting securities of Weatherford
                 over which the undersigned has dispositive power; provided,
                 however, First Reserve Secured Energy Assets Fund, L.P. may
                 sell or distribute its voting securities of Weatherford in
                 connection with the liquidation of such fund as long as the
                 undersigned provides EVI with evidence satisfactory to EVI
                 that such sale or distribution would not adversely affect the
                 Merger from being accounted for as a pooling of interests.
<PAGE>   2
EVI, Inc.
March 4, 1998
Page 2


         (iv)    The undersigned agrees that upon consummation of the Merger,
                 all stockholder agreements with Weatherford, including the
                 Agreement dated as of June 23, 1995, as amended, among
                 Weatherford International Incorporated and American Gas & Oil
                 Investors, L.P., AMGO II, L.P., AMGO III, L.P., First Reserve
                 Secured Energy Assets Fund, L.P., First Reserve Fund V, L.P.,
                 First Reserve Fund V-2, L.P., First Reserve Fund VI, L.P.,
                 First Reserve Corporation, William E. Macaulay and John A.
                 Hill, shall be terminated and the undersigned shall have no
                 further rights thereunder.

         (v)     The undersigned agree to sign the affiliate letter in the form
                 attached hereto.

                                      Very truly yours,
                                      
                                      FIRST RESERVE CORPORATION
                                      
                                      
                                      
                                      By:
                                         ---------------------------------------
                                               William E. Macaulay
                                               President and
                                               Chief Executive Officer
                                      
                                      
                                      FIRST RESERVE FUNDS:
                                      
                                      AMERICAN GAS & OIL INVESTORS, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation





<PAGE>   3
EVI, Inc.
March 4, 1998
Page 3


                                      AMGO II, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation
                                      
                                      FIRST RESERVE SECURED ENERGY
                                      ASSETS FUND, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation
                                      
                                      
                                      FIRST RESERVE FUND V, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation
                                      
                                      FIRST RESERVE FUND V-2, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation





<PAGE>   4
EVI, Inc.
March 4, 1998
Page 4


                                      FIRST RESERVE FUND VI, L.P.
                                      
                                      By:      FIRST RESERVE CORPORATION,
                                               its Managing General Partner
                                      
                                      
                                               By:
                                                  ------------------------------
                                                       William E. Macaulay
                                                       President and Chief
                                                       Executive Officer
                                                       First Reserve Corporation
                                      
                                      
                                      
                                      
                                      ------------------------------------------
                                      William E. Macaulay
                                      
                                      
                                      
                                      
                                      ------------------------------------------
                                      John A. Hill





<PAGE>   5
EVI, Inc.
March 4, 1998
Page 5


AGREED AND CONFIRMED:

EVI, INC.



By:
   ----------------------------------------
         Bernard J. Duroc-Danner
         President and Chief
         Executive Officer







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