UTI ENERGY CORP
8-K, 1996-08-28
OIL & GAS FIELD SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934


                       DATE OF REPORT:  AUGUST 28, 1996


                                UTI ENERGY CORP.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


          DELAWARE                    001-2542                  23-2037823
(STATE OR OTHER JURISDICTION   (COMMISSION FILE NUMBER)      (I.R.S. EMPLOYER 
      OF INCORPORATION)                                     IDENTIFICATION NO.)




    485 DEVON PARK DRIVE, SUITE 112
          WAYNE, PENNSYLVANIA                                      19087
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                         (ZIP CODE)





       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (610) 971-9600


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<PAGE>   2
ITEM 2:  ACQUISITION OR DISPOSITION OF ASSETS

         On August 14, 1996 (the "Closing Date"), UTI Energy Corp., a Delaware
corporation (the "Company"), entered into a Stock Purchase Agreement (the "Stock
Purchase Agreement") with The Sam K. Viersen Jr. Trust dated September 9, 1986
as Amended and Restated on May 11, 1994 (the "Seller"), pursuant to which a
subsidiary of the Company purchased all of the outstanding shares (the "Shares")
of capital stock of the Viersen & Cochran Drilling Company, an Oklahoma
corporation ("Viersen").  Viersen owns a fleet of 13 drilling rigs with related
spare equipment and approximately 500,000 feet of drill pipe.  Viersen had
suspended its operations prior to the Closing Date.  The Company intends to use
Viersen's assets in its operations and may dispose of certain of the acquired
assets to the extent such assets are determined to be surplus to the future
operations of the Company.  Under the terms of the Stock Purchase Agreement, the
consideration paid by the Company for the Shares, which was arrived at through
arms-length negotiations between the parties, consisted of (i) $6,000,000 in
cash paid on August 14, 1996 (a portion of which the Company borrowed under
its existing credit agreement); (ii) a two-year $8,000,000 promissory note (the
"Promissory Note") executed by the Company in favor of the Seller; and (iii)
stock warrants (the "Warrants") to purchase 200,000 shares of the Company's
common stock, $.001 par value, at $15 per share.

         The Promissory Note bears interest at the rate of 6% per annum and is
payable in full on or before August 14, 1998.  The terms of the Promissory Note
require the Company to make a principal payment of $1,500,000 on or before
August 14, 1996 and an additional principal payment of $1,500,000 on or before
February 14, 1997.  The Company has the option under the Promissory Note to pay
Seller $7,650,000 plus accrued interest on or before February 14, 1997 in full
satisfaction of the Promissory Note.  The Company's obligations under the
Promissory Note are guaranteed by Viersen and are secured by a pledge of the
assets of Viersen pursuant to a security agreement.


ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

*        (a)     Financial statements of business acquired.

*        (b)     Pro forma financial information.

         (c)     Exhibits.

         2.1     Stock Purchase Agreement dated August 14, 1996, by and between
                 The Sam K. Viersen, Jr. Trust dated September 9, 1986 as
                 Amended and Restated on May 11, 1994 and UTI Energy Corp.
                 Pursuant to Item 601(b)(2) of Regulation S-K, schedules and
                 similar attachments (other than Attachment A) to the Stock
                 Purchase Agreement have not been filed with this exhibit.
                 Attachments B, D and E to the Stock Purchase Agreement have
                 been filed as Exhibits 4.1, 4.2 and 4.3 to this Form 8-K,
                 respectively.  Exhibits C (form of Guaranty Agreement), F
                 (form of Lease Agreement) and G (form of Escrow Agreement) as
                 well as the Disclosure Schedule, which contains a list of
                 Viersen's assets and liabilities and





                                      -2-
<PAGE>   3
                 Viersen's financial statements, will be filed supplementally
                 with the Commission upon request.

         4.1     Promissory Note of UTI Energy Corp. dated August 14, 1996, in
                 the principal amount of $8,000,000 in favor of The Sam K.
                 Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994.

         4.2     Hypothecation/Security Agreement dated August 14, 1996, by
                 Viersen & Cochran Drilling Company in favor of The Sam K.
                 Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994.

         4.3     Stock Purchase Warrant dated August 14, 1996, between The Sam
                 K. Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994 and UTI Energy Corp.


*        To be filed by amendment.  It is impracticable for the Company to
         provide the required financial statements and pro forma information
         for Viersen & Cochran Drilling Company as of the date of this Form
         8-K.  Such financial statements will be filed by amendment within 60
         days from the date this is due.





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<PAGE>   4
                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                UTI ENERGY CORP.


                                            /s/  P. BLAKE DUPUIS
Dated: August 28, 1996               --------------------------------------
                                                 P. Blake DuPuis
                                                 Vice President





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<PAGE>   5
                                 EXHIBIT INDEX

         2.1     Stock Purchase Agreement dated August 14, 1996, by and between
                 The Sam K. Viersen, Jr. Trust dated September 9, 1986 as
                 Amended and Restated on May 11, 1994 and UTI Energy Corp.

         4.1     Promissory Note of UTI Energy Corp. dated August 14, 1996, in
                 the principal amount of $8,000,000 in favor of The Sam K.
                 Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994.

         4.2     Hypothecation/Security Agreement dated August 14, 1996, by
                 Viersen & Cochran Drilling Company in favor of The Sam K.
                 Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994.

         4.3     Stock Purchase Warrant dated August 14, 1996, between The Sam
                 K. Viersen, Jr. Trust dated September 9, 1986 as Amended and
                 Restated on May 11, 1994 and UTI Energy Corp.






<PAGE>   1


                                                                     EXHIBIT 2.1


                            STOCK PURCHASE AGREEMENT


         This Stock Purchase Agreement ("Agreement") is made and entered into
this 14th day of August, 1996, by and between The Sam K. Viersen Jr. Trust
dated September 9, 1986 as Amended and Restated on May 11, 1994 ("Seller"), and
UTI Energy Corp. ("Buyer").

                                    RECITALS

A.       Seller owns all the outstanding shares of the capital stock ("Shares")
         of the Viersen & Cochran Drilling Company, an Oklahoma corporation
         ("Company").

B.       Seller desires to sell to Buyer and Buyer desires to acquire the
         Shares on the terms and conditions herein set forth.

C.       Capitalized terms used herein shall have the meaning set forth on
         Attachment "A", attached hereto unless otherwise stated herein.

NOW THEREFORE, in consideration of mutual promises, conditions and covenants
herein contained and other good and valuable consideration, receipt of which is
hereby acknowledged, the parties hereto agree as follows:

                                   ARTICLE I

                  AGREEMENT TO SELL AND AGREEMENT TO PURCHASE

1.1      PURCHASE AND SALE OF SHARES.  On the terms and subject to the
         conditions set forth herein, Seller hereby agrees to sell, transfer,
         convey, assign and deliver to Buyer, free and clear of all Security
         Interests whatsoever, and Buyer hereby agrees to purchase, acquire and
         accept from Seller all of the Shares for the Purchase Price set forth
         in Section 1.2 below.

1.2      PURCHASE PRICE.  The purchase price for the Shares shall be
         $14,000,000 ("Purchase Price") subject to adjustments as herein
         provided.  The Purchase Price shall be paid as follows:

         1.2.1      The sum of $6,000,000 shall be paid to Buyer at Closing in
                    immediately available funds by cashiers' check or wire
                    transfer to a bank account designated by Seller not less
                    than two business days prior to the Closing Date.
                    Notwithstanding the foregoing, a portion of the cash
                    Purchase Price in an amount equal to the Accounts Payable
                    and Accrued Liabilities shall be withheld by Buyer in
                    accordance with the provisions of Section 4.2 hereof.

         1.2.2      The sum of $8,000,000 by the execution by Buyer at Closing
                    of a promissory note in the form set forth on Attachment
                    "B" hereto ("Secured Note"), which shall be secured by the
                    Assets, bear interest at the rate of 6% per annum and be
                    payable in full on or before two years from the Closing
                    Date. The Secured Note's terms will require that Buyer make
                    a principal payment of $1,500,000 on or before the first
                    anniversary of the Closing Date, and an additional
                    principal payment of $1,500,000 on or before eighteen
                    months after the Closing Date.  Buyer shall have the right,
                    but not the obligation, to pay to Seller $7,650,000 on or
                    before six months after the Closing Date in full
                    satisfaction of the Secured Note, but such right shall
                    lapse and be void if not exercised within such six months.
                    Payment of the Secured Note shall be guaranteed by the
                    Company in the form of the Guaranty Agreement set forth on
                    Attachment "C" hereto.  The security interest shall be
                    evidenced by a security agreement executed by the Company
                    ("Security Agreement") and financing statements
<PAGE>   2
                    (collectively the "Collateral Documents").  The form of the
                    Security Agreement is attached hereto as Attachment "D".

         1.2.3      Additionally, Buyer shall deliver to Seller, at the
                    Closing, warrants entitling Seller, at its sole option, to
                    purchase up to 200,000 shares of Buyer's common stock at
                    the initial exercise price of $15.00 per share at any time
                    within two years after the Closing Date and having such
                    additional terms and conditions as are set forth in
                    Attachment "E" attached hereto (the "Warrants").

1.3      CLOSING.  The Closing shall take place at the offices of Pray, Walker,
         Jackman, Williamson & Marlar, 100 West Fifth Street, Ninth Floor,
         Tulsa, Oklahoma, commencing at 10:00 a.m. (CST) on the Closing Date,
         or such other time, date or location as may be agreed to by Buyer and
         Seller.

1.4      DELIVERIES AT THE CLOSING.  At the Closing, (i) Seller will deliver to
         Buyer stock certificates representing the Shares, endorsed in blank or
         accompanied by duly executed stock powers, and the various
         certificates, instruments, and documents referred to in Section 5.1,
         and (ii) Buyer will deliver to Seller the cash portion of the Purchase
         Price due at Closing, the Secured Note, the Collateral Documents, the
         Warrants and the various certificates, instruments, and documents
         referred to in Section 5.2.

1.5      FURTHER ASSURANCES.  From time to time after the Closing, Seller and
         Buyer agree to execute and deliver to the other such instruments of
         sale, transfer, conveyance, assignment and delivery, consents,
         assurances, powers of attorney and other instruments as may be
         reasonably requested by counsel for Buyer and Seller in order to vest
         in Buyer all right, title and interest of Seller in and to the Shares
         and otherwise in order to carry out the purpose and intent of this
         Agreement.

1.6      CONDEMNATION OF, OR MATERIAL DAMAGE TO, ASSETS.  In the event of,
         prior to the Closing, the destruction of, or material damage to, any
         Asset which shall have a Fair Market Value exceeding $10,000 (a
         "Casualty Event"), which Seller shall have elected not to repair,
         rebuild, restore or replace as provided below, Buyer, at its option,
         may elect, prior to the Closing, (i) to exclude such Asset and to
         treat such Asset as an Excluded Asset, provided, however, that the
         Purchase Price shall be reduced by the Fair Market Value of such Asset
         to reflect the exclusion of such Asset; or (ii) in the event that such
         Asset or all such Assets shall have a Fair Market Value which shall
         exceed $500,000, not to consummate the transactions contemplated by
         this Agreement.  Seller shall give Buyer prompt written notice (a
         "Casualty Notice") of any such condemnation or Casualty Event,
         indicating the Asset or Assets which suffered such condemnation or
         Casualty Event, and Seller's estimate of the Fair Market Value of each
         such Asset, accompanied by copies of all insurance related thereto,
         any deductibles or retention applicable thereto, any defenses
         threatened or asserted by the insurer or known to Seller, its estimate
         of, and all available information relevant to, the cost of repair,
         rebuilding, restoration or replacement thereof, and any other
         information reasonably requested by Buyer.  In the case of any
         retention or deductible, Seller shall provide to Buyer prompt notice
         of such retention or deductible.  Seller may, in the applicable
         Casualty Notice, elect, at the sole cost and expense of Seller, to
         repair, rebuild, restore or replace such Asset for the benefit of the
         Company.  Upon any such election, Buyer shall have the option,
         exercisable by notice to Seller on or before the fifth business day
         after such Casualty Notice (but in any event prior to the Closing), to
         accept such Asset without such repair, rebuilding, restoration or
         replacement, in which event the cash portion of the Purchase Price
         shall be reduced by the estimated cost of repair, rebuilding,
         restoration or replacement as set forth in such Casualty Notice.  In
         the event that Buyer does not exercise such option, Seller shall
         promptly undertake to provide sufficient funds to, and





                                      -2-
<PAGE>   3
         otherwise to cause, the Company to repair, rebuild, restore or replace
         such Asset to substantially the same condition as prior to the event
         causing such destruction or damage.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

2.1      REPRESENTATIONS AND WARRANTIES OF SELLER.  Seller represents and
         warrants to Buyer that except as set forth in the Disclosure Schedule:

         2.1.1      AUTHORIZATION AND TITLE.  Seller is the Sam K. Viersen, Jr.
                    Revocable Trust u/t/a dated September 9, 1986, as amended
                    and Restated u/t/a dated May 11, 1994.  The Trustee acting
                    for and on behalf of Seller has the necessary power and
                    authority to enter into this Agreement on behalf of Seller
                    and to carry out the obligations hereunder.  No further
                    actions by Seller, and no permission by any third party, is
                    necessary for the execution and delivery of this Agreement
                    by Seller, and the performance by Seller of its obligations
                    hereunder.  This Agreement has been duly and validly
                    executed and delivered by the Trustee on behalf of Seller
                    (and assuming the due authorization, execution and delivery
                    hereof by Buyer), is a legal, valid and binding obligation
                    of Seller, enforceable against it in accordance with its
                    terms, subject, however, to applicable bankruptcy,
                    insolvency or similar laws relating to or affecting the
                    enforceability of creditors' rights generally, and general
                    equitable principles and limitations on the availability of
                    equitable remedies.

         2.1.2      ORGANIZATION, QUALIFICATION AND CORPORATE POWER OF THE
                    COMPANY.  The Company is a corporation duly organized,
                    validly existing, and in good standing under the laws of
                    the State of Oklahoma.  The Company is duly qualified or
                    licensed to conduct business as a foreign corporation and
                    is in good standing under the laws of each jurisdiction
                    where such qualification is required, all of which are set
                    forth in the Disclosure Schedule.  The Company has
                    corporate power and authority, and all licenses, permits,
                    and authorizations necessary to carry on, the businesses in
                    which it is engaged and to own and use the properties and
                    assets (including the Assets) owned and used by it.  Seller
                    has delivered to Buyer, correct and complete copies of the
                    charter and bylaws of the Company (as amended to date).
                    The Company's minute book, a copy of which has been
                    provided to Buyer, contains the records of all meetings and
                    consents of the stockholders, the board of directors, and
                    any committees of the board of directors, and the stock
                    register and transfer books of the Company records all
                    issuances and transfers of record of the capital stock of
                    the Company.  The Company is not in default under or in
                    violation of any provision of its charter or bylaws.

         2.1.3      CAPITALIZATION.  The authorized capital stock of the
                    Company consists of 20,000 shares of common stock, $100.00
                    par value, of which 11,300 shares (constituting the Shares)
                    are issued and outstanding and no shares are held in
                    treasury.  The Shares have been duly authorized and validly
                    issued, are fully paid and non-assessable and were not
                    issued in violation of any preemptive rights or any
                    applicable Law.  There are no outstanding or authorized
                    options, warrants, subscriptions, calls, conversions or
                    other rights, contracts, agreements, commitments or
                    understandings of any kind obligating the Company to issue,
                    sell, purchase, return or redeem any shares of its capital
                    stock or any other securities convertible into,
                    exchangeable for or evidencing the right to subscribe for
                    any shares of capital stock of or other ownership interest
                    in





                                      -3-
<PAGE>   4
                    the Company.  Seller is the record and beneficial owner of
                    the Shares, free and clear of all Security Interests, and,
                    upon delivery of the Shares to Buyer against payment of the
                    Purchase Price, Buyer will own the Shares free and clear of
                    all Security Interests (other than those created by Buyer).
                    Seller is not a party to any voting trust, proxy, or other
                    agreement or understanding with respect to the voting of
                    any capital stock of the Company.

         2.1.4      CONFLICTING INSTRUMENTS; CONSENTS.

                    (i)    The execution and delivery by Seller of this
                           Agreement do not, and the performance by Seller of
                           its obligations hereunder and the consummation of
                           the transactions contemplated hereby will not, (i)
                           violate any provision of the trust agreement of
                           Seller or the articles of incorporation or the
                           bylaws of the Company, or result in the creation of
                           any Security Interest upon the assets of Seller or
                           the Company, or (ii) except for the authorizations,
                           approvals, consents or other actions set forth in
                           Section 2.1.4 of the Disclosure Schedule, conflict
                           with or result in a breach of, create an event of
                           default (or event that, with the giving of notice or
                           lapse of time or both, would constitute an event of
                           default) under, or give any third party the right to
                           terminate, cancel or accelerate any obligation under
                           any agreement, contract, lease, license, instrument
                           or other agreement to which Seller or the Company is
                           a party or by which Seller or the Company, or any
                           assets or properties of Seller or the Company, are
                           bound or affected.

                    (ii)   Except as set forth in Section 2.1.4 of the
                           Disclosure Schedule, the execution and delivery by
                           Seller of this Agreement do not, and the
                           consummation of the transactions contemplated hereby
                           will not, result in a violation of, or require any
                           authorization, approval, consent or other action by,
                           or registration, declaration or filing with or
                           notice to, any Governmental Authority pursuant to,
                           any Law applicable to Seller.  There is no pending
                           or, to Seller's Knowledge, threatened Proceeding
                           before or by any Governmental Authority, involving
                           or to restrain or prevent the consummation of the
                           transactions contemplated by this Agreement or, to
                           Seller's Knowledge, the right of Buyer to own the
                           Shares after the Closing Date.

         2.1.5      BROKERS' FEES.  Except for Wayne E. Swearingen or
                    Swearingen Petroleum Management, Inc., whose fees and
                    expenses shall be paid by Seller, neither Seller nor the
                    Company has engaged any finder, broker, consultant or
                    intermediary who would be entitled to a fee for the
                    transactions relating to this Agreement, or otherwise
                    incurred any liability for any such fees with respect
                    hereto.

         2.1.6      TITLE TO ASSETS.  The Company has good and marketable title
                    to all of the drilling and related equipment listed in
                    Section 2.1.6 of the Disclosure Schedule (the "Assets"),
                    free and clear of all Security Interests.

         2.1.7      SUBSIDIARIES.  There are no corporations, partnerships,
                    joint ventures, associations, limited liability companies
                    or other entities in which the Company owns, of record or
                    beneficially, any direct or indirect equity interest or
                    other interest or has any right, obligation or commitment
                    (contingent or otherwise) to acquire any such equity
                    interest.





                                      -4-
<PAGE>   5
         2.1.8      FINANCIAL STATEMENTS.  The Financial Statements which are
                    attached as Section 2.1.8 to the Disclosure Statement have
                    been prepared from the books and records of the Company and
                    present fairly the financial condition and results of
                    operations of the Company as of the dates and for the
                    periods indicated using a cash basis of accounting.

         2.1.9      NO MATERIAL ADVERSE CHANGE.  Since the date of the
                    Financial Statements, there has been no material adverse
                    change in the financial condition, business or assets of
                    the Company or, to Seller's Knowledge, any change which
                    would have a material effect on the future financial
                    condition, business or assets, of the Company.

         2.1.10     INSURANCE.  Section 2.1.10 of the Disclosure Schedule sets
                    forth a summary of the existing insurance policies carried
                    by the Company as of the date hereof.  Such policies will
                    be maintained through the Closing Date.

         2.1.11     COMPLIANCE WITH APPLICABLE LAW.  The Company has complied
                    in all material respects and is now in compliance in all
                    material respect with all laws, ordinances, regulations,
                    rules, orders, judgments, injunctions and decrees
                    applicable to the business of the Company and the Assets.

         2.1.12     UNDISCLOSED LIABILITIES.  To Seller's Knowledge, the
                    Company has no Liability (and there is no Basis for any
                    present or future action, suit, proceeding, hearing,
                    investigation, charge, complaint, claim, or demand against
                    it that might give rise to any Liability), except for (i)
                    Liabilities set forth on the face of the Financial
                    Statements (with any offsetting accruals thereto described
                    in Section 2.1.12 of the Disclosure Schedule) and (ii)
                    accounts payable and accrued liabilities incurred in the
                    Ordinary Course of Business (none of which results from,
                    arises out of, relates to, is in the nature of, or was
                    caused by any breach of contract, breach of warranty, tort,
                    infringement, or violation of law) that will be satisfied
                    in accordance with the provisions of Section 4.2.

         2.1.13     TAXES.

                    (i)    The Company has filed or will file prior to the
                           Closing all Tax Returns that it was or is required
                           to file on or before the Closing Date. All such Tax
                           Returns were or will be correct and complete when
                           filed.  All Taxes owed by the Company (whether or
                           not shown or to be shown on any Tax Return) have
                           been or will be timely paid on or before the Closing
                           Date.  The Company is not currently the beneficiary
                           of any extension of time within which to file any
                           Tax Return.  No claim has ever been made by a
                           Governmental Authority in a jurisdiction where the
                           Company does not file Tax Returns that it is or may
                           be subject to taxation by that jurisdiction.  There
                           are no Security Interests on any of the assets of
                           the Company that arose in connection with any
                           failure (or alleged failure) of any person,
                           including the Company and the Seller, to pay any
                           Tax.

                    (ii)   Seller, in respect of its income and interest
                           attributable to the Company, has filed or will file
                           prior to the Closing all Tax Returns that it was or
                           is required to file on or before the Closing Date.
                           All such Tax Returns were or will be correct and
                           complete.  All Taxes owed by Seller in respect of
                           its income and interest attributable to the Company
                           (whether or not shown or to be shown on





                                      -5-
<PAGE>   6
                           any Tax Return) have been or will be timely paid. No
                           Tax Return of the Seller is subject to audit in
                           regard to any matter relating to the Company.

                    (iii)  The Company has withheld and paid and will withhold
                           and pay prior to the Closing all Taxes required or
                           which will be required to have been withheld and
                           paid on or before the Closing Date in connection
                           with amounts paid or owing to any employee,
                           independent contractor, creditor, stockholder, or
                           other third party.

                    (iv)   There is no dispute or claim concerning any Tax
                           Liability of the Company or the Seller in respect of
                           its income from or interest in the Company either
                           (A) claimed or raised by any Governmental Authority
                           in writing, or (B) as to which any of Seller and the
                           directors and officers (and employees responsible
                           for Tax matters) of the Company has knowledge based
                           upon personal contact with any agent of such
                           authority.  Seller has delivered to Buyer correct
                           and complete copies of all federal, state, local and
                           foreign income Tax Returns, examination reports, and
                           statements of deficiencies assessed against or
                           agreed to by the Company since September 15, 1990.

                    (v)    The Company has not waived any statute of
                           limitations in respect of Taxes or agreed to any
                           extension of time with respect to a Tax assessment
                           or deficiency.

                    (vi)   The Company has not filed a consent under Code Sec.
                           341(f) concerning collapsible corporations.  The
                           Company has not made any payments, is not obligated
                           to make any payments, and is not a party to any
                           agreement that under certain circumstances could
                           obligate it to make any payments that will not be
                           deductible under Code Sec. 280G.  The Company has
                           not been a United States real property holding
                           corporation within the meaning of Code Sec.897(c)(2)
                           during the applicable period specified in Code Sec.
                           897(c)(1)(A)(ii).  The Company is not a party to any
                           Tax allocation or sharing agreement.  The Company
                           (A) has never been and is not a member of an
                           affiliated group filing a consolidated federal
                           income Tax Return, and (B) has no Liability for the
                           Taxes of any Person (other than the Company) under
                           Treas. Reg. Section 1.1502-6 (or any similar 
                           provision of state, local, or foreign law), as a 
                           transferee or successor by contract, or otherwise.

                    (vii)  The Company has qualified as an "S Corporation" as
                           defined in Section 1361 et seq. of the Code (and any
                           similar provisions of state or local law) since
                           January 1968, and has no Subchapter C earnings and
                           profits.

         2.1.14     PATENTS, TRADEMARKS, INTELLECTUAL PROPERTY.  Except as set
                    forth in Section 2.1.14 of the Disclosure Statement, the
                    Company does not own or have rights in any patents,
                    copyrights, trade names, trademarks or other forms of
                    intellectual property.

         2.1.15     CONDUCT OF BUSINESS SINCE THE FINANCIAL STATEMENTS DATE.
                    Since the date of the Financial Statements through the date
                    hereof, the Company has not, to Seller's Knowledge (i)
                    incurred or become subject to, or agreed to incur or become
                    subject to, any Liability except accounts payable and
                    accrued liabilities incurred in the Ordinary Course of
                    Business that are to be paid in accordance with Section
                    4.2; (ii) declared any dividend; (iii) redeemed any capital
                    stock; or (iv) discontinued any business operation.





                                      -6-
<PAGE>   7
         2.1.16     LITIGATION.  Except as disclosed in Section 2.1.16 of the
                    Disclosure Statement, there are no claims, actions, suits,
                    proceedings or investigations pending or, to Seller's
                    Knowledge, threatened nor, to Seller's Knowledge, does any
                    basis for such a claim exist, against the Company or its
                    assets or business (including the Assets) before any
                    Governmental Authority; nor is the Company a plaintiff or
                    claimant in any such action or proceeding.  The Company is
                    not subject to or in default with respect to any order,
                    judgment, injunction or decree of any Governmental
                    Authority, which materially and adversely affects the
                    Assets or financial condition of the Company.

         2.1.17     LABOR RELATIONS.  There are no labor strikes, slow downs,
                    work stoppages, grievance proceedings or other
                    controversies pending or, to Seller's Knowledge, threatened
                    between the Company and any of its current or former
                    employees.  The Company is not a party to or not bound by
                    any collective bargaining agreement.  To Seller's
                    Knowledge, the Company has not committed any unfair labor
                    practice and no organizational effort is presently being
                    made or threatened by or on behalf of any labor union with
                    respect to employees of any of the Company.  All employees
                    of the Company are employed on an at-will basis and may be
                    terminated without cause, subject to applicable laws.

         2.1.18     EMPLOYEE BENEFIT MATTERS.

                    (i)    Section 2.1.18 of the Disclosure Schedule contains a
                           list of all "employee pension benefit plans" (as
                           defined in Section 3(2) of ERISA) (sometimes
                           referred to herein as "Pension Plans"), all
                           "employee welfare benefit plans" (as defined in
                           Section 3(1) of ERISA) (sometimes referred to herein
                           as "Welfare Plans"), all payroll practices providing
                           benefits (such as vacation and retention
                           incentives), cafeteria plans, employee assistance
                           plans, incentive compensation plans, stock purchase,
                           stock option, phantom stock, and scholarship
                           programs or other plan arrangements or
                           understandings, whether or not legally binding,
                           providing benefits (collectively referred to as
                           "Benefit Plans") currently maintained, or
                           contributed to, or obligated to be contributed to,
                           by the Company for the benefit of any present or
                           former officers or employees of the Company.  The
                           Company has delivered to Buyer true, complete and
                           correct copies of all documents related to the
                           Benefit Plans which were requested by the Buyer as
                           part of its due diligence procedures.

                    (ii)   All Benefit Plans that are Pension Plans have been
                           the subject of determination letters from the IRS to
                           the effect that such Pension Plans are qualified and
                           exempt from Federal income taxes under Section
                           401(a) and 501(a), respectively, of the Code and no
                           such determination letter has been revoked nor has
                           revocation been threatened, nor has any such Pension
                           Plan been amended since the date of its most recent
                           determination letter or application thereof in any
                           respect that would adversely affect its
                           qualification or materially increase its costs.  To
                           Seller's Knowledge, no event has occurred which
                           could subject any Benefit Plan that is a Pension
                           Plan to disqualification by the IRS under the Code.
                           The Company has paid all premiums (including any
                           applicable interest, charges and penalties for late
                           payment) due the Pension Benefit Guaranty
                           Corporation ("PBGC") with respect to each Benefit
                           Plan that is a Pension Plan for which premiums are
                           required.  No Pension Plan previously maintained by
                           the Company has been terminated under circumstances
                           which would result in liability to the PBGC.





                                      -7-
<PAGE>   8
                    (iii)  Each Benefit Plan which is currently sponsored,
                           participated in or contributed to by the Company:
                           (i) is in compliance with all requirements of ERISA,
                           (ii) has no issue pending (other than the payment of
                           benefits in the normal course) nor any issue
                           resolved adversely to the Company which may subject
                           the Company to the payment of any penalty, interest,
                           Tax or other obligation, and (iii) is in compliance
                           with the terms of the Benefit Plan and the Code
                           except where a failure would not have a material
                           adverse effect on the Company.

                    (iv)   Any voluntary employee benefit associations
                           maintained or contributed to by the Company have
                           been submitted to and approved as exempt from
                           federal income Tax under Section 501(c)(9) of the
                           Code by the IRS and nothing has occurred which could
                           result in the revocation of such exempt status.

                    (v)    The execution of this Agreement or the consummation
                           of the transactions contemplated by this Agreement
                           will not give rise to any, or trigger any, change of
                           control, or severance benefit or other similar
                           provision in any Benefit Plan.

                    (vi)   Section 2.1.18 of the Disclosure Schedule lists the
                           names of all current retirees with either
                           post-retirement life insurance coverage and/or
                           post-retirement medical insurance coverage provided
                           under a Benefit Plan of the Company.

                    (vii)  No Benefit Plan that is a Pension Plan that the
                           Company maintains, or to which the Company is
                           obligated to contribute, had, as of the respective
                           annual valuation date for each such Pension Plan, an
                           "unfunded benefit liability" (as such term is
                           defined in Section 4001(a)(18) of ERISA).  None of
                           the Benefit Plans which are Pension Plans have an
                           "accumulated funding deficiency" (as such term is
                           defined in Section 302 of ERISA or Section 412 of
                           the Code), whether or not waived.  To Seller's
                           knowledge, none of the Company, any officer of the
                           Company or any of the Benefit Plans which are
                           subject to ERISA, including the Benefit Plans that
                           are Pension Plans, or any trusts created thereunder,
                           or any trustee or administrator thereof, has engaged
                           in a "prohibited transaction" (as such term is
                           defined in Section 406, 407 or 408 of ERISA or
                           Section 4975 of the Code) or any other breach of
                           fiduciary responsibility that could subject the
                           Company or any officer of the Company to the Tax or
                           penalty on prohibited transactions imposed by such
                           Section 4975 or to any liability under Section
                           502(i)(1) of ERISA.  Neither any of such Benefit
                           Plans nor any of such trusts have been terminated,
                           nor has there been any "reportable event" (as that
                           term is defined in Section 4043 of ERISA) with
                           respect to which the 30-day notice requirement has
                           not been waived and Seller is not aware of any other
                           reportable events with respect thereto during the
                           last five years.  the Company has never been a party
                           to or contributed to a "multi-employer pension plan"
                           (as such term is defined in Section 4001(a)(3) of
                           ERISA).

                    (viii) With respect to any Benefit Plan that is a
                           Welfare Plan, (i) no such Benefit Plan includes      
                           a welfare benefits fund, as such term is defined in
                           Section 419(e) of the Code, and (ii) each such
                           Benefit Plan that is a group health plan, as such
                           term is defined in Section 5000(b)(1) of the Code,
                           complies with the applicable requirements of Section
                           4980B(f) of the Code.





                                      -8-
<PAGE>   9
                    (ix)   Neither the Company, nor any member of a controlled
                           group or affiliated service group as defined in
                           Sections 414(b), (c), (m) and (o) of the Code or as
                           defined in ERISA of which the Company is a member
                           has made a complete or partial withdrawal from a
                           multi-employer plan (as defined in Section 3(37) of
                           ERISA) so as to incur withdrawal liability as
                           defined in Section 4201 of ERISA which remains
                           unpaid.  Neither the execution of this Agreement nor
                           the consummation of the transactions contemplated by
                           this Agreement will give rise to, or trigger, any
                           liability under ERISA to the Company.

         2.1.19     ENVIRONMENT, HEALTH, AND SAFETY.  To Seller's Knowledge:

                    (i)    The Company has complied with all Environmental,
                           Health, and Safety Laws, and no action, suit,
                           proceeding, hearing, investigation, charge,
                           complaint, claim, demand, or notice has been filed
                           or commenced against it alleging any failure so to
                           comply.  Without limiting the generality of the
                           preceding sentence, the Company has obtained and
                           been in compliance with all of the terms and
                           conditions of all permits, licenses, and other
                           authorizations which are required under, and has
                           complied with all other limitations, restrictions,
                           conditions, standards, prohibitions, requirements,
                           obligations, schedules, and timetables which are
                           contained in, all Environmental, Health, and Safety
                           Laws.

                    (ii)   The Company has no Environmental Liabilities and has
                           not handled or disposed of any substance, arranged
                           for the disposal of any substance, exposed any
                           employee or other individual to any substance or
                           condition, owned or operated any property or
                           facility in any manner that could form the Basis for
                           any present or future action, suit, proceeding,
                           hearing, investigation, charge, complaint, claim, or
                           demand against the Company giving rise to any
                           Environmental Liability for damage to any site,
                           location, or body of water (surface or subsurface),
                           for any illness of or personal injury to any
                           employee or other individual, or for any reason
                           under any Environmental, Health, and Safety Law.

                    (iii)  All properties and equipment used in the business of
                           the Company has at all times been free of asbestos,
                           PCB's, methylene chloride, trichloroethylene,
                           1,2-transdichloroethylene, dioxins, dibenzofurans,
                           and extremely hazardous substances.

                    (iv)   The Company has not received any notice, nor is
                           Seller aware, of any proposal to amend, revoke or
                           replace any environmental permit of the Company, or
                           requiring the issuance of any additional
                           environmental permits.

                    (v)    The Company is not currently operating or required
                           to operate under any compliance order, schedule,
                           decree or agreement, any consent decree, order or
                           agreement, or corrective action decree, order or
                           agreement issued by any Governmental Entity
                           regarding any Environmental, Health, and Safety Law

         2.1.20     LEASED REAL PROPERTY.  As of the Closing, the Company will
                    not have any lease interest or obligations under any leases
                    respecting any real property other than those described in
                    the Disclosure Schedule.





                                      -9-
<PAGE>   10
         2.1.21     MATERIAL CONTRACTS.

                    (i)    Except as set forth in Section 2.1.21 of the
                           Disclosure Schedule, the Company is not a party to,
                           or bound by any agreement, contract, instrument,
                           commitment or arrangement (whether written or oral):

                           (a)    which contains restrictions with respect to
                                  the payment of dividends or any other
                                  distribution in respect of its capital stock
                                  or the purchase, redemption or other
                                  acquisition of capital stock,

                           (b)    relating to any expenditure or a series of
                                  related expenditures in excess of $5,000,

                           (c)    relating to (i) the borrowing of money by the
                                  Company or the granting of any Security
                                  Interest or (ii) any guarantee or other
                                  contingent liability (identifying the primary
                                  contract or agreement to which such guarantee
                                  or contingent liability relates or the
                                  agreement pursuant to which such guarantee
                                  was delivered),

                           (d)    with respect to employment, management
                                  services, consulting or any other similar
                                  type of services,

                           (e)    limiting the freedom of the Company or any
                                  affiliate of the Company to engage in any
                                  line of business, to own, operate, sell,
                                  transfer, pledge or otherwise dispose of or
                                  encumber any asset or to compete with any
                                  Person or to engage in any business or
                                  activity in any geographic area,

                           (f)    obligating the Company or that would obligate
                                  or require any subsequent owner of the
                                  business currently conducted by the Company
                                  or any of the Assets to provide for
                                  indemnification or contribution with respect
                                  to any matter,

                           (g)    with Seller or any Affiliate of Seller,

                           (h)    that could be expected to have a material 
                                  adverse effect on the Company 

                                  (collectively, the "Contracts").

                    (ii)   Except as set forth in Section 2.1.21 of the
                           Disclosure Schedule, the Company is not in breach of
                           or in default under any of the Contracts and no
                           event has occurred that, with the giving of notice
                           or lapse of time or both, would constitute such a
                           breach or default.  All Contracts are in full force
                           and effect and, to Seller's Knowledge, are
                           enforceable in accordance with their terms, subject
                           to the effect of any applicable bankruptcy,
                           reorganization, insolvency, moratorium, fraudulent
                           transfer, fraudulent conveyance or similar laws
                           affecting creditors' rights generally and subject,
                           as to enforceability, to the effect of general
                           principles of equity.

         2.1.22     ACCREDITED INVESTOR; INVESTMENT PURPOSE.  Seller (i) is an
                    accredited investor as that term is defined in Regulation D
                    promulgated under the Securities Act and (ii) is acquiring
                    the Warrant (and any Warrant Shares upon the exercise of
                    the Warrant) for





                                      -10-
<PAGE>   11
                    its own account, for investment purposes and not with a
                    view to, or for resale in connection with, any distribution
                    or public offering thereof within the meaning of the
                    Securities Act.  Seller acknowledges that the issuances to
                    Seller of the Warrant and, except as otherwise expressly
                    provided in the Warrant, the Warrant Shares (upon exercise
                    of the Warrant) have not been registered under the
                    Securities Act or the securities laws of any state.

2.2      REPRESENTATIONS AND WARRANTIES OF BUYER.  Buyer represents and
         warrants to Seller that the statements contained in this Section 2.2
         are correct and complete as of the Closing Date.

         2.2.1      ORGANIZATION.  Buyer is a corporation duly organized,
                    validly existing and in good standing under the laws of the
                    State of Delaware and has the corporate power and corporate
                    authority to own, operate and lease its property and assets
                    and to carry on its business as it is now being conducted.

         2.2.2      AUTHORIZATION.  Buyer has the necessary corporate power and
                    authority to enter into this Agreement and to carry out its
                    obligations hereunder.  This Agreement has been duly and
                    validly executed and delivered by Buyer and, assuming the
                    due authorization, execution and delivery hereof by Seller,
                    is a legal, valid and binding obligation Buyer, enforceable
                    against it in accordance with its terms, subject, however,
                    to applicable bankruptcy, insolvency or similar laws
                    relating to or affecting the enforceability of creditors'
                    rights generally, and general equitable principles and
                    limitations on the availability of equitable remedies. The
                    Secured Note, the Collateral Documents and the Warrants,
                    when signed and delivered at the Closing will be legal,
                    valid and binding obligations of Buyer, enforceable against
                    it in accordance with their respective terms, subject,
                    however, to applicable bankruptcy, insolvency or similar
                    laws relating to or affecting the enforceability of
                    creditors' rights generally, and general equitable
                    principles and limitations on the availability of equitable
                    remedies.

         2.2.3      CONFLICTING INSTRUMENTS; CONSENTS.

                    (i)    The execution and delivery by Buyer of this
                           Agreement do not, and the performance by Buyer of
                           its obligations hereunder and the consummation of
                           the transactions contemplated hereby will not, (i)
                           violate any provision of the certificate of
                           incorporation or the bylaws of Buyer, or (ii) except
                           for the approval of Buyer's lender or as otherwise
                           set forth in Schedule 2.2.3 hereto, conflict with or
                           result in a breach of, create an event of default
                           (or event that, with the giving of notice or lapse
                           of time or both, would constitute an event of
                           default) under, or give any third party the right to
                           terminate, cancel or accelerate any obligation under
                           any material contract to which Buyer is a party or
                           by which Buyer, or any of its assets or properties
                           are bound or affected.

                    (ii)   Except as set forth Schedule 2.2.3 hereto, the
                           execution and delivery by Buyer of this Agreement do
                           not, and the consummation of the transactions
                           contemplated hereby will not, result in a violation
                           of, or require any authorization, approval, consent
                           or other action by, or registration, declaration or
                           filing with or notice to, any Governmental Authority
                           pursuant to, any Law applicable to Buyer.  There is
                           no pending or, to the knowledge of Buyer threatened
                           Proceeding before or by any Governmental Authority,
                           involving or seeking to restrain or prevent the
                           consummation of the transactions contemplated by
                           this Agreement.





                                      -11-
<PAGE>   12
         2.2.4      ACCREDITED INVESTOR; INVESTMENT PURPOSE.  Buyer (i) is an
                    accredited investor as that term is defined in Regulation D
                    promulgated under the Securities Act, and (ii) is acquiring
                    the Shares for its own account, for investment purposes and
                    not with a view to, or for resale in connection with, any
                    distribution or public offering thereof within the meaning
                    of the Securities Act.  Buyer acknowledges that the
                    issuance to Buyer of the Shares has not been registered
                    under the Securities Act or the securities laws of any
                    state.

         2.2.5      CONDITION OF ASSETS.  BY CLOSING THIS TRANSACTION, BUYER
                    AFFIRMS THAT SELLER MAKES NO REPRESENTATIONS OR WARRANTIES
                    REGARDING THE CONDITION OR STATE OF REPAIR OF ANY OF THE
                    ASSETS.  BUYER AGREES THAT IT SHALL TAKE THE ASSETS IN AN
                    "AS IS" CONDITION.  BUYER ACKNOWLEDGES THAT SELLER
                    DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
                    PARTICULAR PURPOSE AS TO ANY OF THE ASSETS OF THE COMPANY.

                                  ARTICLE III

                             PRE-CLOSING COVENANTS

The parties agree as follows with respect to the period between the execution
of this Agreement and the Closing:

3.1      NOTICES AND CONSENTS.  Seller and Buyer will give any notices to third
         parties, and will use all reasonable commercial efforts to obtain all
         third-party consents, that are required for the consummation of the
         transactions contemplated hereby.  Each of the parties will (and
         Seller will cause the Company to) give any notices to, make any
         filings with, and use all reasonable commercial efforts to obtain any
         authorizations, consents and approvals of Governmental Authorities
         required with respect to the transactions contemplated by this
         Agreement, and each party shall give the other information reasonably
         requested by such other party pertaining to it and its subsidiaries
         and affiliates to enable such other party to take such actions.

3.2      ACCESS.  Between the date of this Agreement and the Closing Date,
         Seller will cause the Company to provide Buyer, during normal business
         hours and in a manner which will not unreasonably interfere with the
         Company's business operations, with full access to the Company's
         offices, books and records, and provide to Buyer such financial and
         operating data and other information with respect to the business and
         assets of the Company as Buyer may reasonably request, including
         access to or copies of all contracts, agreements and arrangements with
         customers, vendors, lessees, licensors, and suppliers.

3.3      OPERATION OF BUSINESS.  Between the date of this Agreement and the
         Closing Date, except as otherwise contemplated in this Agreement or
         consented to in writing by Buyer, Seller shall cause Company to
         maintain all of its assets in good care and condition, and to maintain
         insurance policies in respect of its business and assets consistent
         with past practices; and to conduct its business only in the Ordinary
         Course of Business, provided however, Buyer acknowledges that the
         Company is no longer actively contracting for drilling and the staff
         of the Company has been reduced substantially.  By way of
         amplification and not limitation, except as contemplated in this
         Agreement, Seller will cause the Company to not, without the prior
         written consent of Buyer, (i) amend its Articles of Incorporation or
         Bylaws, (ii) borrow or agree to borrow any funds directly or
         indirectly, guarantee or agree to guarantee the obligations of others,
         (iii) enter into any agreement, contract or commitment that will have
         any continuing obligations on or liability





                                      -12-
<PAGE>   13
         to the Company,  (iv) sell or otherwise dispose of any interest in any
         of its assets (except the Excluded Assets), (v) commit any act or omit
         to do any act which will cause a breach of any agreement, contract or
         commitment, (vi) violate any law, statute, rule, governmental
         regulation or order, (vii) engage in any activity or transactions or
         incur any obligation (by conduct or otherwise) which reasonably could
         be expected to have a material adverse effect on its business and
         operations, (viii) make any loan to any affiliate of the Company, or
         declare, set aside or pay to any stockholder any dividend or other
         distribution in respect of its capital stock (other than in connection
         with the transfer or disposition of the Excluded Assets), or redeem or
         purchase any of its capital stock, or agree to take any such action;
         (ix) reclassify, issue, sell, transfer, pledge, encumber or deliver or
         agree to issue, sell or transfer, pledge, encumber or deliver any
         shares of its capital stock or other equity securities of the Company,
         or any options, warrants or other rights, of whatsoever kind or
         nature, to purchase or acquire, or any securities convertible into,
         any such shares of equity securities of the Company; (x) make any
         change in accounting principles, policies or procedures utilized by
         the Company in the preparation of the Financial Statements; (xi) make
         any Tax elections; or (xii) commit to any of the foregoing.

3.4      UPDATED FINANCIAL STATEMENTS.  Seller shall cause the Company to
         deliver to Buyer at the Closing Date its most current unaudited
         financial statements and shall deliver an updated accounts receivable
         aging report, equipment list and trade payables list.

3.5      CONFIDENTIALITY.  If, following the execution of this Agreement by the
         parties hereto, the Closing shall not occur for any reason, each of
         the parties agree to return to the other, all documents and
         confidential data received by such party in connection with this
         Agreement, together with all copies thereof which  such party may have
         made, and to refrain from disclosing any such confidential data to any
         other Person, except to the extent required by law or such data is or,
         through no breach by such party of its obligations hereunder, becomes
         generally available to the public

3.6      PUBLICITY.  The parties acknowledge that it is in their joint
         interests to coordinate all industry, customer and public
         communications with respect to this transaction so as to enhance the
         image of the Company.  Accordingly, neither party shall make any
         public announcement of this Agreement or the transactions contemplated
         hereby until after the Closing Date except to the extent required by
         law or deemed advisable after consultation with counsel.
         Announcements, when made, including required notices to customers and
         agents, shall be made pursuant to a communications plan (which will
         include the text of all announcements and press releases for the
         public, customers and agents, and other key interested persons)
         approved by the parties.  Communications required to secure regulatory
         approvals of this transaction, if any, shall be excluded from the
         provisions of this paragraph.

3.7      CERTAIN ACTIONS PROHIBITED.  Seller represents that the Company and
         Seller have not taken, and shall not take, any action that would have
         the effect of deferring a liability for taxes from a period prior to
         or on the Closing to a period following the Closing.

3.8      NEGOTIATION WITH OTHERS.  Seller agrees that from the date hereof
         until the Closing Date or the termination of this Agreement pursuant
         to Section 5.3, that it will not and will not permit the Company nor
         any of its advisors, representatives, officers, employees or other
         agents to, directly or indirectly, negotiate with any Person not a
         party hereto or not affiliated with a party hereto with respect to a
         merger, consolidation, asset purchase, stock purchase or any similar
         transaction with any such Person.





                                      -13-
<PAGE>   14
                                   ARTICLE IV

                                OTHER AGREEMENTS

4.1      EXCLUDED ASSETS.  Prior to the Closing, Seller shall cause the Company
         to assign or transfer to Seller or other third party all Excluded
         Assets listed in Schedule 4.1 of the Disclosure Schedule.   The
         arrangements for assignment or transfer shall be acceptable to Buyer
         and shall not result in any adverse income tax consequences to the
         Company or other adverse effect on the business, financial condition
         or Assets of the Company following the Closing.

4.2      LIABILITIES OF THE COMPANY AT CLOSING.  Prior to the Closing, Seller
         shall cause Company to pay or otherwise eliminate all short term or
         long term debt of the Company.  The arrangements for such payment or
         disposition shall be by arrangements which are acceptable to Buyer and
         shall not result in any adverse income Tax or other effect on the
         business, financial condition or assets of the Company.  Prior to the
         Closing Date, Seller shall estimate the Company's accounts payable and
         accrued liabilities as of the Closing Date ("Accounts Payable and
         Accrued Liabilities") and provide a schedule thereof to Buyer.  Buyer
         shall retain from the cash Purchase Price an amount equal to the
         aggregate of the Accounts Payable and Accrued Liabilities for the
         purpose of satisfying same as they become due and payable; provided,
         however, that nothing in this Section 4.2 shall limit the liability of
         Seller under Section 6.2 in the event Seller's estimate of Accounts
         Payable and Accrued Liabilities is understated.  Seller represents
         that after giving effect to the Accounts Payable and Accrued
         Liabilities and the payment of such other liabilities, the Company
         will have no liabilities or obligations, whether fixed or contingent,
         known or unknown, matured or unmatured.

4.3      USE OF THE NAME OF VIERSEN AND COCHRAN.  Within 120 days of the
         Closing, Buyer shall eliminate the phrase "Viersen & Cochran" and any
         logo or mark related thereto, together with any word or expression
         similar thereto from the Assets.  Neither Buyer nor any of its
         Affiliates shall thereafter use such phrase, logo or mark; provided,
         however, Buyer may refer to "Viersen & Cochran Drilling Company" as
         the former name of the Company where necessary, except Buyer shall not
         refer to such former name in its letterhead or any advertising
         literature.  Additionally, within the same time period, Buyer will
         cause a change in the name of the Company to a name other than Viersen
         & Cochran.

4.4      OBLIGATIONS REGARDING TAXES.  Seller and Buyer agree as follows:

         (i)        Seller shall pay and be liable for and shall hold Buyer and
                    its affiliates (including, after the Closing, the Company)
                    harmless against any liability for Taxes relating to the
                    Company for any tax period ending on or before the Closing
                    Date ("Pre-Closing Tax Period").  Buyer shall pay and be
                    liable for and shall hold Seller harmless against any
                    liability for Taxes relating to the Company with respect to
                    any tax period beginning after the Closing Date
                    ("Post-Closing Tax Period").

         (ii)       For purposes of Section 4.4(i) hereof, in the case of a
                    taxable period, if any, that includes but does not end on
                    the Closing Date, the Taxes attributable to each of the
                    Pre-Closing Tax Period and to the Post-Closing Tax Period
                    shall be determined on the basis of an interim closing of
                    the books as of and including the Closing Date.  Buyer and
                    Seller agree that (x) as soon as practicable after the
                    Closing Date, Buyer and Seller shall consult and cooperate
                    with each other in good faith, and shall use their
                    respective best efforts, in order to reach a mutually
                    acceptable agreement with respect to the amount of the
                    Taxes for which each of Buyer and Seller are responsible
                    under





                                      -14-
<PAGE>   15
                    this Section 4.4(ii) and to minimize future disputes
                    between the parties hereto concerning such matters;
                    provided, however, that any failure to initiate or engage
                    in any such consultations or to reach any such mutually
                    acceptable agreement shall not impair or otherwise affect
                    any of the rights and obligations of the parties hereto
                    under this Agreement.

         (iii)      Buyer agrees to assign and promptly remit (and to cause the
                    Company to assign and promptly remit) to Seller all refunds
                    of any Taxes described in Section 4.4(i) for any
                    Pre-Closing Tax Period, together with any interest actually
                    received thereon, received by it with respect to
                    Pre-Closing Tax Periods (net of any Taxes imposed on Buyer
                    or the Company with respect thereto), to the extent such
                    Taxes (i) relate to any Pre-Closing Tax Period for which
                    Seller is responsible under this Section 4.4 and (ii) were
                    either (A) paid by or on behalf of the Company on or before
                    the Closing Date, or (B) paid by Seller after the Closing
                    Date, pursuant to Seller's obligation under this Section
                    4.4.

         (iv)       Any and all refunds received of any Taxes described in
                    Section 4.4(ii) hereof for which Buyer is responsible and
                    any interest thereon shall be retained by Buyer and its
                    affiliates, including, after the Closing, the Company (or,
                    if applicable, shall be promptly paid or caused to be paid
                    by Seller to Buyer if any such refund is received by
                    Seller).  Any and all refunds of any Taxes described in
                    Section 4.4(ii) hereof, for which Seller is responsible,
                    and any interest thereon shall be retained by Seller (or,
                    if applicable, shall be promptly paid or caused to be paid
                    by Buyer to Seller, if any such refund is received by Buyer
                    or any of its affiliates), but such right to retain or
                    receive payment shall be limited to and shall not exceed
                    the amount of Taxes described in Section 4.4(ii) that
                    Seller has actually paid after the Closing Date pursuant to
                    Seller's obligations under Section 4.4(ii).

         (v)        Seller shall prepare or cause to be prepared, and shall
                    file or cause to be filed, all Tax Returns with respect to
                    Taxes of the Company for all taxable periods ending on or
                    before the Closing Date.  Buyer and the Company shall
                    prepare or cause to be prepared, and shall file or cause to
                    be filed, all Tax Returns with respect to Taxes of, or
                    which include, the Company for all taxable periods ending
                    after the Closing Date.  In the event that one party is
                    responsible for preparing a Tax Return under this Section
                    4.4(v) and the other party is responsible in whole or in
                    part for the Taxes reflected on such Tax Return, then such
                    Tax Return shall be submitted to such other party at least
                    60 days before its due date (including any extension
                    thereof), but in no event sooner than 15 days following the
                    close of the taxable period covered by such Tax Return, and
                    shall be subject to approval by such other party, which
                    approval shall not be unreasonably withheld.

         (vi)       Each of Buyer and Seller shall cooperate with the other
                    party with respect to, and shall make available to the
                    other on a reasonably timely basis such tax data and other
                    information as may be reasonably required for, the
                    preparation of any Tax Returns required to be prepared and
                    filed with respect to the Company and for the conduct of
                    any audits or litigation with respect to Taxes of the
                    Company or for the proper payment of any Taxes for which
                    such party is responsible under this Section 4.4.  The
                    expenses of preparing such tax data and other information
                    will be borne by the party responsible for preparing such
                    Tax Return, conducting such audit or litigation or paying
                    such Taxes.  In connection therewith, for as long as is
                    reasonably necessary, at Seller's request, Buyer will, and
                    will cause the Company to, cooperate fully with





                                      -15-
<PAGE>   16
                    Seller and make available to Seller, at the reasonable
                    request of Seller and at any reasonable time and from time
                    to time, at the business location at which the books and
                    records are maintained, the information required to
                    complete all such Tax Returns or to properly pay such Taxes
                    or to conduct such audits or litigation.

         (vii)      Each of Buyer and Seller shall promptly notify the other
                    party of any issues that arise out of an audit or
                    examination of the Company or Seller (in respect of its
                    income or interest in the Company) relating to Taxes
                    payable in respect to a taxable period that ends on or
                    before the Closing Date.  Thereafter, if there is commenced
                    an administrative or judicial proceeding in which the IRS
                    or a foreign, state or local government is a party relating
                    to such Taxes (a "Contest"), Seller shall keep Buyer
                    informed of any material developments relating to any such
                    Contest, except with respect to any such Contest involving
                    federal income Taxes unless such Contest might affect the
                    Tax liability of Buyer or the Company for any Post-Closing
                    Tax Period.  Seller shall, in good faith, consult with
                    Buyer concerning the appropriate actions or positions to be
                    taken throughout the course of any such Contest which
                    relate to the Company and shall allow it to participate
                    jointly (except with respect to matters involving federal
                    income Taxes) in conjunction with Seller, in any such
                    Contest on matters involving the Company.  Seller shall
                    have full control over any such audit, examination or
                    Contest relating solely to a taxable period ending on or
                    before the Closing Date and ultimate discretion with
                    respect to any decisions to be made or the nature of any
                    action to be taken in the course thereof and Buyer shall
                    reasonably cooperate with Seller.  This Section 4.4(vii)
                    shall apply only to an audit, examination or Contest
                    relating to Taxes payable with respect to a taxable period
                    ending on or before the Closing Date and for which Seller
                    has total liability pursuant to this Agreement.

         (viii)     Buyer and Seller each will promptly notify the other of any
                    audit or examination of the Company relating to Taxes
                    payable in respect to any taxable period beginning before
                    the Closing Date (the "Closing Period") and for which Buyer
                    is or may be responsible for all or any portion of the
                    liability for such Taxes under this Agreement.  With
                    respect to any such audit or examination or any Contest
                    regarding any such Tax, (i) if such audit, examination or
                    Contest relates solely to liability for such Taxes for
                    which Seller is liable pursuant to this Agreement, then
                    Seller shall have full and complete control of such audit,
                    examination or Contest; (ii) if such audit, examination or
                    Contest relates solely to liability for such Taxes for
                    which Buyer is liable pursuant to this Agreement, then
                    Buyer shall have full and complete control of such audit,
                    examination or Contest; and (iii) if such audit,
                    examination or Contest relates to such Taxes for which both
                    Buyer and Seller may be liable under this Agreement, then
                    Seller and Buyer jointly shall control such audit,
                    examination or Contest and agree to cooperate in good faith
                    in the pursuance of such audit, examination or Contest.
                    The party hereto controlling an audit, examination or
                    Contest under clauses (i) or (ii) of the preceding sentence
                    shall keep the other party hereto informed of any material
                    developments relating to any such audit, examination or
                    Contest.  This Section 4.4(viii) shall apply only to an
                    audit, examination or Contest relating to Taxes (other than
                    Taxes covered by the provision of Section 4.4(vii) hereof)
                    payable in respect of a Closing Period.

         (ix)       Notwithstanding anything contained in this Agreement to the
                    contrary, the rights and obligations set forth in this
                    Section 4.4 shall survive for a period coterminous with the
                    statute of limitations applicable to each particular item
                    of Taxes; provided, however,





                                      -16-
<PAGE>   17
                    that in the event that a claim is brought against the
                    Company in respect of any item of Taxes within the
                    applicable survival period, the rights and obligations
                    under this Section 4.4 with respect thereto shall survive
                    the expiration of such period until such claim is finally
                    resolved and any obligations with respect thereto are fully
                    satisfied.

4.5      FINANCIAL STATEMENTS.  Seller agrees to cooperate with Buyer and to
         assist the Company's outside auditors in the preparation of any
         financial statements relating to the Company that may be reasonably
         requested by Buyer for filing with the United States Securities and
         Exchange Commission in connection with any filings that may be made by
         Buyer under the Securities Act or the Securities Exchange Act of 1934.
         Such financial statements shall consist of (i) such audited balance
         sheets and audited statements of operations, cash flows and changes in
         equity together with the notes thereon and (ii) such unaudited interim
         balance sheet and unaudited interim statements of operations, cash
         flows and changes in equity, if any, in each case as Buyer shall
         reasonably deem to be required by Buyer.  Seller agrees to reimburse
         the Company or Buyer, promptly upon receipt of the invoices from the
         Company's outside auditors, for the cost, not to exceed $80,000, of
         preparation of the foregoing financial statements.

4.6      USE OF CERTAIN PROPERTY.  Following the Closing, Seller agrees that it
         shall afford the Company, free of charge, full access to and use of
         the office building, yard and farm located in Oklahoma City, Oklahoma
         and more particularly described in the Lease Agreements set forth on
         Attachment "F" hereto (the "Lease Agreements"), for a period of 30
         days following the Closing Date.  At Buyer's option, Buyer may
         continue to use such property after such 30-day period pursuant to the
         terms of the Lease Agreements and shall have an option to purchase
         such properties as set forth in the Lease Agreements.

4.7      EMPLOYEE BENEFIT MATTERS.         At Closing, Seller shall have caused
         the Company to terminate all of its employees and shall have satisfied
         or assumed all responsibilities of the Company for salaries, taxes,
         withholdings, benefits and other responsibilities to such employees.
         Seller agrees that it has caused one of its affiliates to assume the
         obligations of the Company under the Company's insurance policy and
         has secured a new policy, which (i) provides benefits to employees and
         former employees of the Company and certain affiliates of the Company
         who previously participated in the Company's policy and (ii) will be
         made available to provide benefits to former employees of the Company
         in satisfaction of any COBRA obligations the Company might have.

                                   ARTICLE V

                       CONDITIONS TO OBLIGATION TO CLOSE

5.1      CONDITIONS TO OBLIGATION OF BUYER.  The obligation of Buyer to
         purchase the Shares hereunder shall be subject to satisfaction of the
         following conditions:

         5.1.1      The Trustee of the Seller shall have furnished Buyer at the
                    Closing with certified copies of its appointment as Trustee
                    of the Trust and documents describing Trustee's authority
                    to act with respect to the execution, delivery and
                    performance of this Agreement by Seller;

         5.1.2      The representations and warranties of Seller set forth in
                    Section 2.1 shall be true and correct in all material
                    respects (ignoring, for purposes of this Section  5.1.2,
                    any materiality qualifier in the representation or
                    warranty) as of the Closing Date with the same effect as
                    though such representations and warranties had been made as
                    of the





                                      -17-
<PAGE>   18
                    Closing Date except (i) to the extent such representations
                    and warranties expressly relate to a specific date or (ii)
                    as otherwise contemplated by this Agreement, and Seller
                    shall have provided a certificate to Buyer to such effect;

         5.1.3      Seller shall have performed, and complied in all material
                    respects with all of the covenants and agreements required
                    of it in this Agreement as of the Closing, and Seller shall
                    have provided a certificate to Buyer to such effect;

         5.1.4      Seller and the Company shall have procured all third party
                    consents as may be necessary to permit the consummation by
                    Seller of the transactions contemplated by this Agreement;

         5.1.5      No action, suit or proceeding shall be pending before any
                    Governmental Agency wherein an unfavorable outcome would
                    (i) prevent the consummation of any of the transactions
                    contemplated by this Agreement, (ii) cause any of such
                    transactions to be rescinded following consummation, (iii)
                    affect adversely the right of Buyer to own the Shares, or
                    (iv) affect adversely the right of the Company to own its
                    Assets and to operate its business (and no such injunction,
                    judgment, order, decree, ruling or charge shall be in
                    effect);

         5.1.6      Seller shall have delivered to Buyer stock certificates
                    representing the Shares, endorsed in blank or accompanied
                    by duly executed stock powers;

         5.1.7      Seller shall have delivered to Buyer a certificate to the
                    effect that all conditions to closing set forth in this
                    Section 5.1 have been satisfied or waived (which
                    certificate shall not survive the Closing);

         5.1.8      Buyer shall have received the resignations, effective as of
                    the Closing, of each director and officer of the Company;

         5.1.9      All actions, proceedings, instruments and other documents
                    required to consummate the transactions contemplated by
                    this Agreement, and all other related legal matters, shall
                    be reasonably satisfactory to counsel to Buyer;

         5.1.10     Seller shall have delivered to Buyer a fully executed
                    certification of non-foreign status as described in United
                    States Treasury Regulation Section 1.1445-2(a)(2);

         5.1.11     Buyer shall have received approval of this transaction from
                    Buyer's Board of Directors;

         5.1.12     Buyer shall have been satisfied with the results of its due
                    diligence review of business, operations, assets, and
                    liabilities of the Company; provided however, if Buyer
                    determines, during the course of its due diligence, that it
                    cannot proceed with the transaction due to the discovery of
                    an event or situation uncovered during the due diligence
                    process, Buyer agrees to promptly advise Seller of such
                    decision to terminate and not wait to disclose such
                    decision until the end of the due diligence period;

         5.1.13     Buyer shall have obtained approval of this transaction 
                    from its lender(s).





                                      -18-
<PAGE>   19
         5.1.14     Seller shall have executed and delivered the Escrow
                    Agreement and the Warrants and shall have delivered
                    releases from all affiliates of Seller to the effect set
                    forth in Sections 7.13 and 7.14 hereof.

         At or prior to the Closing, Buyer may waive in writing any conditions
         specified in this Section 5.1.

5.2      CONDITIONS TO OBLIGATION OF SELLER.  The obligation of Seller to sell
         the Shares hereunder shall be subject to satisfaction of the following
         conditions:

         5.2.1      Buyer shall have furnished Seller at the Closing with
                    certified copies of resolutions duly adopted by the Board
                    of Directors of Buyer, which resolutions shall authorize
                    the execution, delivery and performance of this Agreement
                    by Buyer;

         5.2.2      The representations and warranties of Buyer set forth in
                    Section 2.2 shall be true and correct in all material
                    respects (ignoring, for purposes of this Section  5.2.2,
                    any materiality qualifier in the representation or
                    warranty)  as of the Closing Date with the same effect as
                    though such representations and warranties had been made as
                    of the Closing Date except (i) to the extent that such
                    representations and warranties expressly relate to a
                    specific date, or (ii) as otherwise contemplated by this
                    Agreement, and Buyer shall have provided a certificate to
                    Seller to such effect;

         5.2.3      Buyer shall have performed, and complied, in all material
                    respects with all of the covenants and agreements required
                    of it in this Agreement as of the Closing, and Buyer shall
                    have provided a certificate to Seller to such effect;

         5.2.4      Buyer shall have procured all third party consents as may
                    be necessary to permit the consummation by Buyer of the
                    transactions contemplated by this Agreement;

         5.2.5      No action, suit or proceeding shall be pending before any
                    Governmental Agency of wherein an unfavorable outcome would
                    (i) prevent consummation of any of the transactions
                    contemplated by this Agreement, (ii) cause any of such
                    transactions to be rescinded following consummation, or
                    (iii) affect adversely the right of Seller to own the
                    Warrant (and no such injunction, judgment, order, decree,
                    ruling or charge shall be in effect);

         5.2.6      Buyer shall have delivered to Seller a certificate to the
                    effect that all conditions to closing set forth in this
                    Section 5.2 have been satisfied or waived (which
                    certificate shall not survive the Closing);

         5.2.7      All actions, proceedings, instruments and other documents
                    required to consummate the transactions contemplated by
                    this Agreement, and all other related legal matters shall
                    be reasonably satisfactory to counsel to Seller;

         5.2.8      Buyer shall have executed and delivered the Secured Note,
                    the Escrow Agreement and the Warrants, and shall have
                    delivered the Collateral Documents and the Guaranty
                    Agreement.

         At or prior to the Closing, Seller may waive in writing any condition
         specified in this Section 5.2





                                      -19-
<PAGE>   20
5.3      TERMINATION.  This Agreement may be terminated at any time prior to
         the Closing:

         5.3.1      by Buyer, if there has been a material breach or default
                    (which, for purposes of this Section 5.3.1, shall mean (i)
                    a breach or default that has a financial impact on the
                    Company or Buyer of $50,000 or more or (ii) a breach or
                    default that, if known by Buyer, would have affected
                    Buyer's decision to enter into this Agreement) by Seller of
                    any agreement, representation or warranty contained in this
                    Agreement, which breach or default cannot be cured and
                    which has not been waived in writing by Buyer;

         5.3.2      by Seller, if there has been a material breach or default
                    (which, for purposes of this Section 5.3.2, shall mean (i)
                    a breach or default that has a financial impact on Seller
                    of $50,000 or more or (ii) a breach or default that, if
                    known by Seller, would have affected Seller's decision to
                    enter into this Agreement) by Buyer of any agreement,
                    representation or warranty contained in this Agreement,
                    which breach or default cannot be cured and which has not
                    been waived in writing by Seller;

         5.3.3      by Buyer or Seller, if a court of competent jurisdiction or
                    Governmental Authority shall have issued an order, decree
                    or ruling or taken any other action (which Buyer and Seller
                    agree to use all reasonable efforts to terminate), in each
                    case permanently restraining, enjoining or otherwise
                    prohibiting the transactions contemplated by this
                    Agreement;

         5.3.4      by mutual consent of Buyer and Seller; or

         5.3.5      by Buyer or Seller if the Closing does not occur by August
                    31, 1996.

5.4      PROCEDURE AND EFFECT OF TERMINATION.  If this Agreement is terminated
         as provided herein, there shall be no liability or further obligation
         hereunder on the part of Buyer or Seller, except as to the matters set
         forth in Sections 3.5, 3.6 and 7.11; provided that, in the event of
         termination by reason of Section 5.3.1 or 5.3.2, the non-breaching
         party shall retain its right to recover damages as permitted by law,
         including its reasonable attorney fees.  Nothing in this Section 5.4
         shall relieve any party to this Agreement of liability for willful
         breach of this Agreement.

                                   ARTICLE VI

            INDEMNIFICATION AND REMEDIES FOR BREACH OF THE AGREEMENT

6.1      SURVIVAL.  Except as otherwise provided in Section 4.4 hereof with
         respect to Taxes, each of the representations and warranties of the
         parties contained herein (as confirmed by the certificates delivered
         pursuant to the provisions of Sections 5.1 and 5.2) shall survive the
         Closing hereunder for the Survival Period after which they shall
         terminate and be of no further force or effect.  The agreements and
         covenants contained in Articles I, IV, and VII herein shall survive
         the Closing and continue without limitation; provided, however, the
         agreements and covenants set forth in Section 4.2 hereof in respect of
         any unknown liabilities and obligations at such date shall only
         survive for 15 months following the Closing.  In addition, the
         indemnity and offset obligations and rights set forth in this Article
         VI shall survive and continue for so  long as there is any right to
         seek indemnification hereunder.

6.2      INDEMNIFICATION PROVISIONS FOR BENEFIT OF BUYER.  Subject to Section
         6.4.6, Seller shall defend, indemnify and hold harmless Buyer, the
         Company and each of their respective officers,





                                      -20-
<PAGE>   21
         directors, employees, agents, stockholders and controlling Persons and
         their respective successors and assigns ("Buyer Indemnitees") from and
         against any and all Adverse Consequences incurred or suffered by such
         Buyer Indemnitee and resulting from, or arising out of:

         6.2.1      any inaccuracy in any representation or warranty of Seller
                    set forth in this Agreement, or in any certificate
                    delivered by Seller pursuant to the provisions of Section
                    5.1.2 or 5.1.3, provided that, for purposes of this Section
                    6.2.1, all knowledge and materiality qualifiers in such
                    representations and warranties shall be ignored;

         6.2.2      any Environmental Liability arising from or associated with
                    any event, condition, incident, action or omission existing
                    or occurring prior to the Closing Date relating in any way
                    to the Company or the Assets;

         6.2.3      any Employee Liability;

         6.2.4      any Liability of the Company to the extent it (i) was
                    created or incurred on or before the Closing Date, or (ii)
                    arose or results from or relates to any fact, event,
                    condition or circumstance existing on or before the Closing
                    Date; and

         6.2.5      any breach or failure to comply with any agreement or
                    covenant on the part of Seller contained in this Agreement.

         Each notice of any Adverse Consequence referred to in this Section 6.2
         shall set forth the amount claimed by Buyer to be owing by Seller to
         Buyer and a list identifying (to the extent reasonably possible) each
         separate item constituting such Adverse Consequence.  Buyer shall take
         reasonable actions to mitigate its damages and possible Adverse
         Consequences, which cost of mitigation shall be covered by the
         indemnity set forth in this Section 6.2.

                    Any claim for indemnification under (i) Section  6.2.1 must
         be made within the Survival Period applicable to the representation or
         warranty subject to indemnification, (ii) Section 6.2.4 must be made
         within 15 months after the Closing Date, (iii) Section 6.2.2 or 6.2.3
         must be made within the statute of limitations applicable to the
         Environmental Liability or Employee Liability, respectively, and (iv)
         Section 6.2.5 may be made at any  time.   Any claim for
         indemnification that is first made during the period applicable to
         such claim shall remain in effect for purposes of such indemnification
         notwithstanding such claim may not be resolved within the above time
         periods.

6.3      INDEMNIFICATION PROVISIONS FOR THE BENEFIT OF SELLER.  Buyer shall
         defend, indemnify and hold harmless Seller and its trustees, officers,
         directors, employees, agents, stockholders and controlling Persons and
         their respective heirs, successors and assigns ("Seller Indemnitees")
         from and against any and all Adverse Consequences incurred or suffered
         by such Seller Indemnitee and resulting from, or arising out of:

         6.3.1      any inaccuracy in any representation or warranty of Buyer
                    set forth in this Agreement or in any certificate delivered
                    by Buyer pursuant to the provisions of Section 5.2.2 or
                    5.2.3, provided that, for purposes of this Section 6.3.1,
                    all knowledge and materiality qualifiers in such
                    representations and warranties shall be ignored;

         6.3.2      any Liability of the Company (other than a Liability
                    subject to indemnification under Section 6.2) to the
                    extent, and only to the extent, it is created or incurred
                    after the





                                      -21-
<PAGE>   22
                    Closing Date, with respect to the operation of the business
                    of the Company or the Assets after the Closing Date;

         6.3.3      any breach or failure to comply with any covenant or
                    agreement on the part of Buyer contained in this Agreement.

         Seller shall take reasonable actions to mitigate its damages, which
         cost of mitigation shall be covered by the indemnity set forth in this
         Section 6.3.  Each notice of any Adverse Consequence referred to in
         this Section 6.3 shall set forth the amount claimed by Seller to be
         owing by Buyer to Seller and a list identifying (to the extent
         reasonably possible) each separate item constituting such Adverse
         Consequence.

                    Any claim for indemnification under (i) Section  6.3.1 must
         be made within the Survival Period applicable to the representation or
         warranty subject to indemnification and (ii) Sections 6.3.2 and 6.3.3
         may be made at any time.   Any claim for indemnification that is first
         made during the period applicable to such claim shall remain in effect
         for purposes of such indemnification notwithstanding such claim may
         not be resolved within the above time periods.

6.4      MATTERS INVOLVING THIRD PARTIES.

         6.4.1      If a third party shall notify any Party (the "Indemnified
                    Party") with respect to any matter (a "Third Party Claim")
                    that may give rise to a claim for indemnification against
                    the other Party (the "Indemnifying Party"), then the
                    Indemnified Party shall promptly notify the Indemnifying
                    Party thereof in writing; provided, however, that no delay
                    on the part of the Indemnified Party in notifying the
                    indemnifying Party shall relieve the Indemnifying Party
                    from any obligation hereunder unless (and then only to the
                    extent that) the Indemnifying Party is prejudiced thereby.

         6.4.2      The Indemnifying Party will have the right to defend the
                    Indemnified Party against any Third Party Claim and
                    administer all aspects of such defense with counsel of its
                    choice reasonably satisfactory to the Indemnified Party so
                    long as (i) the Indemnifying Party notifies the Indemnified
                    Party in writing within 15 days after the Indemnified Party
                    has given notice of such Third Party Claim that the
                    Indemnifying Party will indemnify the Indemnified Party
                    from and against the entirety of any Adverse Consequences
                    that the Indemnified Party may suffer resulting from,
                    arising out of, relating to, or caused by, such Third Party
                    Claim; (ii) such Third Party Claim involves only money
                    damages and does not seeks an injunction or other equitable
                    relief; and (iii) the Indemnifying Party conducts the
                    defense of the Third Party Claim actively and diligently.
                    The Indemnified Party may retain separate co-counsel at its
                    sole cost and expense and participate in the defense of the
                    Third Party Claim.

         6.4.3      So long as the Indemnifying Party is conducting the defense
                    of any Third Party Claim in accordance with this Section
                    6.4, (i) the Indemnified Party will not consent to the
                    entry of any judgment or enter into any settlement with
                    respect to such Third Party Claim without the prior written
                    consent of the Indemnifying Party (which consent will not
                    be withheld unreasonably); and (ii) the Indemnifying Party
                    will not consent to the entry of any judgment or enter into
                    any settlement with respect to such Third Party Claim
                    without the prior written consent of the Indemnified Party
                    (which consent will not be withheld unreasonably).





                                      -22-
<PAGE>   23
         6.4.4      To the extent of any payment by the Indemnifying Party of
                    any amount in accordance with the provisions of this
                    Section 6.4, upon the full satisfaction by the Indemnifying
                    Party of its indemnity and payment obligations with respect
                    to such matter, the Indemnifying Party shall be subrogated
                    to all rights which the Indemnified Party shall have
                    against third parties (other than the Company, Buyer, any
                    Affiliate of Buyer or any other person whom might have a
                    right of contribution or indemnity or other right of
                    payment against the Company, Buyer or any Affiliate of
                    Buyer in respect of the matter) for the matter indemnified
                    against.

         6.4.5      The provision and procedures of this Section 6.4 (other
                    than the notice requirement) shall apply to any Third Party
                    Claim existing on the Closing Date, and Seller hereby
                    assumes, effective as of the Closing, all, and shall have
                    sole, responsibility for the payment, administration and
                    defense of, such Third Party Claims, subject to the
                    conditions set forth in this Section 6.4.

         6.4.6      No claim for indemnification by Buyer Indemnitees or Seller
                    Indemnitees against the other party hereto shall be made
                    unless or until the aggregate amount of such claims exceeds
                    $50,000, at which time all claims, including those used to
                    aggregate the floor of $50,000 shall be subject to
                    indemnification to the extent herein provided; provided,
                    however, that claims under Section 6.2.5 hereof in respect
                    of the agreements and covenants set forth in Section 4.7
                    hereof shall not be required to satisfy such threshold
                    requirement, and Seller shall be required to indemnify
                    Buyer for any and all Adverse Consequences relating
                    thereto.  No claim for indemnification shall be effective
                    unless such claim is first made in writing and delivered to
                    the Indemnifying Party hereunder within the time periods
                    required by this Article. The maximum amount of liability
                    by Seller to Buyer for indemnification under Section 6.2.1,
                    shall be the amount of the Purchase Price.  The amount of
                    any Adverse Consequences chargeable to an Indemnifying
                    Party hereunder shall first be reduced by (i) any tax
                    benefits actually received or realized by the Indemnified
                    Party (or the Company) specifically attributed to the event
                    which gives rise to the Adverse Consequence and (ii) any
                    insurance proceeds received by the Indemnified Party (or
                    the Company) with respect thereto.

6.5      SOLE REMEDY.  The right of indemnification provided to any party
         hereto under Article VI shall be the sole and exclusive remedy
         available to such party for any Adverse Consequences or any other
         damages that may be incurred or suffered by such indemnified party(s)
         from the other party(s) hereto resulting from events, actions or
         matters which are subject to indemnification under Article VI.

6.6      LIMIT DAMAGE CLAIMS.  To the extent any party to this Agreement or any
         other agreement, document or instrument executed in connection
         herewith shall have a cause of action or incur any damages that may be
         recoverable against any other party hereto or thereto which are not
         covered by the indemnification in Article VI, but which arise from the
         transactions or obligations of such parties under this Agreement or
         any other such agreement, document or instrument, all such parties
         agree to waive any right they may now have or hereafter obtain to seek
         the recovery of punitive, consequential or indirect damages with
         respect thereto from the other parties (unless incurred as a result of
         a third party claim).

6.7      OFFSET.  In the event Buyer shall not have received any payments due
         it under this Article VI when the same shall be due, Buyer shall be
         entitled to offset any such amounts against amounts owed by it under
         the Secured Note, and in the event there shall be outstanding any
         claim for indemnification by Buyer under this Article VI that shall
         not have been resolved as of the date





                                      -23-
<PAGE>   24
         any principal payment on the Secured Note is due, Buyer shall be
         entitled to defer payment of such principal to the extent the
         remaining principal outstanding under the Secured Note is less than
         the amount which Buyer reasonably believes will be required to be paid
         by Seller under the indemnification provisions of this Article VI for
         all claims then pending by Buyer against Seller under this Article VI.
         In the event Seller disputes Buyer's claim under the indemnification
         provisions, the dispute shall be resolved pursuant to Section 7.7
         hereof.  In addition, in the event Buyer elects to prepay the Secured
         Note, Seller shall be required to deposit $4,000,000 with The Trust
         Company of Oklahoma, as escrow agent, to be held and disbursed in
         accordance with the terms of the escrow agreement set forth in
         Attachment "G" hereto (the "Escrow Agreement").

                                  ARTICLE VII

                            MISCELLANEOUS PROVISIONS

7.1      ENTIRE AGREEMENT; AMENDMENT.  This Agreement (including the Disclosure
         Schedules) contains the entire agreement among the parties hereto and
         supersedes all prior oral or written agreements, commitments or
         understandings with respect to the matters provided for herein.  This
         Agreement may be modified or amended only by a writing duly executed
         by each of the parties hereto, which modification or amendment shall
         be binding upon all of the parties hereto.

7.2      ASSIGNMENTS AND THIRD PARTIES.  Except as specifically contemplated by
         this Agreement, no party hereto shall assign this Agreement or any
         part hereof without the prior written consent of the other party;
         provided, however, Buyer may assign its rights in this Agreement to an
         affiliate of Buyer.  Except as otherwise provided herein, this
         Agreement shall be binding upon and inure to the benefit of the
         parties hereto and their respective successors and assigns.  No such
         assignment shall release a party of any of its obligations under this
         Agreement.

7.3      WAIVERS.  No waiver by any party of, or consent by any party to, a
         variation from or breach of or default under any provision of this
         Agreement shall be effective unless made in a written instrument duly
         executed by or on behalf of such party, and any such waiver or consent
         shall be limited solely to those rights or conditions expressly so
         waived or consented to.  No failure or delay on the part of any party
         exercising any right or privilege under this Agreement shall operate
         as a waiver thereof, nor shall any single or partial exercise of any
         right or power preclude any other or further exercise thereof, or the
         exercise of any right or power under this Agreement.  No other actions
         taken by any party, including, without limitation, any investigation
         by or on behalf of such party, and no failure to take action, shall be
         deemed to constitute a waiver or an extension by such party of
         compliance with any representation, warranty, condition, agreement or
         indemnification set forth in this Agreement.

7.4      NOTICES.  All notices, demands, requests or other communications which
         may be or are required to be given, served, or sent by any party to
         any other party pursuant to this Agreement shall be in writing and
         shall be mailed by first class, registered or certified mail, return
         receipt requested, postage prepaid, or transmitted by hand delivery
         (including delivery by courier), overnight express, telegram, telex or
         facsimile transmission, addressed as follows:

         If to Buyer:      UTI Energy Corp.
                           Attn: President
                           485 Devon Park Drive, #112
                           Wayne, Pennsylvania 19087
                           Telecopy:  610/964-0141





                                      -24-
<PAGE>   25
         With copy to:

                           Fulbright & Jaworski LLP
                           Attn: Curtis Huff
                           1301 McKinney Street, Suite 5100
                           Houston, Texas 77010
                           Telecopy: 713/651-5426

         If to Seller:

                           Trust Company of Oklahoma
                           P.O. Box 3627
                           Tulsa, Oklahoma  74101-3627
                           Attn:  President
                           Telecopy:  918/744-5088

                           Viersen & Cochran
                           Attn: President
                           P.O. Box [19227]
                           Okmulgee, Oklahoma  74447
                           Telecopy:  918/756-5626

         With copy to:

                           Pray, Walker, Jackman, Williamson & Marlar
                           Attn: Donald F. Marlar
                           900 Oneok Plaza
                           100 West 5th Street
                           Tulsa, Oklahoma  74103-4218
                           Telecopy:  918/581-5599


         Each party may designate by notice in writing a new address to which
         any notice, demand or communication may thereafter be so given, served
         or sent.  Each notice, demand, request or communication which shall be
         mailed, delivered or transmitted in the manner described above shall
         be deemed sufficiently given, served, sent, received and delivered for
         all purposes at such time as it is delivered to the addressee (with
         the return receipt, the delivery receipt, the affidavit of messenger
         being deemed conclusive, but not exclusive, evidence of such delivery)
         or at such time as delivery is refused by the addressee upon
         presentation.

7.5      HEADINGS.  The descriptive headings of the several articles and
         section of this Agreement are inserted for convenience only and do not
         constitute a part of this Agreement.

7.6      COUNTERPARTS.  To facilitate execution, this Agreement may be executed
         in as many counterparts as may be required; and it shall not be
         necessary that the signatures of, or on behalf of, each party, or that
         the signatures of all persons required to bind any party, appear on
         each counterpart; but it shall be sufficient that the signature of, or
         on behalf of, each party, or that the signatures of the persons
         required to bind any party, appear on one or more of the counterparts.
         All counterparts shall collectively constitute a single agreement.  It
         shall not be necessary in making proof of this Agreement to produce or
         account for more than a number of counterparts containing the
         respective signatures of, or on behalf of, all of the parties hereto.





                                      -25-
<PAGE>   26
7.7      ARBITRATION.  Any controversy, dispute, or claim arising out of, in
         connection with, or in relation to, the interpretation, performance or
         breach of this Agreement shall be solely and finally settled by
         binding arbitration conducted in Denver, Colorado, by and in
         accordance with the then existing rules for commercial arbitration of
         the American Arbitration Association, or any successor organization.
         Judgment upon any award rendered by the arbitrator(s) may be entered
         by the State or Federal Court having jurisdiction thereof.  Any of the
         parties may demand arbitration by written notice to the other and to
         the American Arbitration Association ("Demand for Arbitration").  Any
         Demand for Arbitration pursuant to this paragraph 9.10 shall be made
         within 180 days from the date that the dispute upon which the demand
         is based arose.  The arbitrators shall conduct the arbitration in a
         manner in accordance with the Federal Arbitration Act U.S.C. Section
         1, et seq. and the rules of the American Arbitration Association.  The
         arbitrators may only award compensatory damages and are specifically
         not empowered to award punitive damages.  The parties hereby expressly
         waive any right any of them may have to punitive damages.  The parties
         intend that this agreement to arbitrate be valid, enforceable and
         irrevocable.

7.8      GOVERNING LAW.  The interpretation and enforcement of this Agreement
         shall be governed by the laws of the State of Oklahoma, except that
         interpretation and enforcement of the provisions relating to the
         arbitration of disputes as set forth in Section 7.7 shall be governed
         exclusively by the Federal Arbitration Act (9 U.S.C.  Sections 1 et
         seq.).

7.9      CONSTRUCTION.  All parties hereto acknowledge that each party was
         actively involved in the negotiation and drafting of this Agreement
         and that no law or rule of construction shall be raised or used in
         which the provisions of this Agreement shall be construed in favor or
         against any party hereto solely because one is deemed to be the author
         thereof.

7.10     SEVERABILITY.  Any provision of this Agreement which is prohibited or
         unenforceable in any jurisdiction shall, as to such jurisdiction, be
         ineffective to the extent of such prohibition or unenforceability
         without invalidating the remaining provisions hereof or affecting the
         validity or enforceability of such provision in any other
         jurisdiction.

7.11     EXPENSES.  Except as otherwise provided herein, each of the parties
         will bear all of its own costs and expenses (including, without
         limitation, legal and accounting fees and expenses) incurred in
         connection with this Agreement and the transactions contemplated
         hereby.

7.12     NO THIRD-PARTY BENEFICIARIES.  EXCEPT AS SET FORTH IN SECTIONS 6.2 AND
         6.3, NOTHING CONTAINED IN THIS AGREEMENT, EXPRESS OR IMPLIED, IS
         INTENDED TO CONFER UPON ANY PERSON, OTHER THAN THE PARTIES AND THEIR
         RESPECTIVE SUCCESSORS AND PERMITTED ASSIGNS, ANY RIGHTS, REMEDIES OR
         OBLIGATIONS UNDER OR BY REASON OF, THIS AGREEMENT.

7.13     RELEASE.  EFFECTIVE AS OF THE CLOSING, SELLER DOES HEREBY, FOR SELLER
         AND SELLER'S AFFILIATES, BENEFICIARIES, SUCCESSORS, ASSIGNS, HEIRS,
         EXECUTORS, ADMINISTRATORS AND LEGAL REPRESENTATIVES REMISE, RELEASE,
         ACQUIT AND FOREVER DISCHARGE THE COMPANY AND ITS AFFILIATES, OFFICERS,
         DIRECTORS, CONTROLLING PERSONS, EMPLOYEES, ATTORNEYS AND SUCCESSORS
         AND ASSIGNS (COLLECTIVELY WITH THE COMPANY, THE "COMPANY RELEASED
         PARTIES") OF AND FROM ANY AND ALL CLAIMS, DEMANDS, LIABILITIES,
         RESPONSIBILITIES, DISPUTES, CAUSES OF ACTION AND OBLIGATIONS OF EVERY
         NATURE WHATSOEVER, LIQUIDATED OR UNLIQUIDATED, KNOWN OR UNKNOWN,
         MATURED OR UNMATURED, FIXED OR CONTINGENT, WHICH SELLER AND SELLER'S
         AFFILIATES NOW HAVE, OWN OR HOLD OR HAVE AT ANY TIME PREVIOUSLY HAD,
         OWNED OR HELD AGAINST THE COMPANY RELEASED PARTIES, INCLUDING WITHOUT
         LIMITATION ANY INDEMNIFICATION OBLIGATION OF THE COMPANY TO SELLER AND
         ALL LIABILITIES





                                      -26-
<PAGE>   27
         CREATED AS A RESULT OF THE SOLE OR CONTRIBUTORY NEGLIGENCE, GROSS
         NEGLIGENCE AND WILLFUL ACTS OF ANY COMPANY RELEASED PARTY, EXISTING AS
         OF THE CLOSING OR RELATED TO ANY MATTER THAT OCCURRED ON OR PRIOR TO
         THE CLOSING; PROVIDED, HOWEVER, THAT ANY CLAIMS, LIABILITIES, DEBTS OR
         CAUSES OF ACTION THAT MAY ARISE IN CONNECTION WITH THE FAILURE OF ANY
         OF THE PARTIES HERETO TO PERFORM ANY OF THEIR OBLIGATIONS HEREUNDER OR
         UNDER ANY OTHER AGREEMENT RELATING TO THE TRANSACTIONS CONTEMPLATED
         HEREBY OR FROM ANY BREACHES BY ANY OF THEM OF ANY REPRESENTATIONS OR
         WARRANTIES HEREIN OR IN CONNECTION WITH ANY OF SUCH OTHER AGREEMENTS
         SHALL NOT BE RELEASED OR DISCHARGED PURSUANT TO THIS AGREEMENT.
         SELLER REPRESENTS AND WARRANTS THAT SELLER HAS NOT PREVIOUSLY ASSIGNED
         OR TRANSFERRED, OR PURPORTED TO ASSIGN OR TRANSFER, TO ANY PERSON OR
         ENTITY WHATSOEVER ALL OR ANY PART OF THE CLAIMS, DEMANDS, LIABILITIES,
         RESPONSIBILITIES, DISPUTES, CAUSES OF ACTION OR OBLIGATIONS RELEASED
         IN THIS SECTION 7.13.  SELLER COVENANTS AND AGREES THAT SELLER WILL
         NOT ASSIGN OR  TRANSFER TO ANY PERSON OR ENTITY WHATSOEVER ALL OR ANY
         PART OF THE CLAIMS, DEMANDS, LIABILITIES, RESPONSIBILITIES, DISPUTES,
         CAUSES OF ACTION OR OBLIGATIONS RELEASED IN THIS SECTION 7.13.  SELLER
         REPRESENTS AND WARRANTS THAT SELLER HAS READ AND UNDERSTANDS ALL OF
         THE PROVISIONS OF THIS SECTION 7.13 AND HAS BEEN REPRESENTED OR
         ADVISED BY LEGAL COUNSEL AND OTHER PROFESSIONAL ADVISORS IN CONNECTION
         WITH THE NEGOTIATION, EXECUTION AND DELIVERY OF THIS AGREEMENT.
         SELLER FURTHER AGREES THAT ALL INDEBTEDNESS BY SELLER OR ANY AFFILIATE
         OF SELLER TO THE COMPANY HAS BEEN PAID IN FULL.  SELLER AGREES THAT
         IMMEDIATELY SUBSEQUENT TO THE CLOSING, EXCEPT FOR ANY EXISTING
         INDEMNIFICATION OBLIGATIONS OF SELLER TO THE COMPANY, WHICH SHALL
         CONTINUE IN EFFECT, THERE WILL BE NO AGREEMENTS, CONTRACTS, LEASES,
         ARRANGEMENTS OR OTHER UNDERSTANDINGS (EITHER WRITTEN OR ORAL) BETWEEN
         SELLER AND THE COMPANY, EXCEPT FOR THIS AGREEMENT AND THE OTHER
         AGREEMENTS CONTEMPLATED HEREBY.

7.14     EXPRESS NEGLIGENCE.  THE INDEMNIFICATION TO BE PROVIDED BY SELLER
         PURSUANT TO ARTICLE VI FOR MATTERS RELATING TO THE COMPANY OR
         REPRESENTATIONS REGARDING THE COMPANY SHALL APPLY NOTWITHSTANDING SUCH
         MATTERS OR REPRESENTATIONS MAY RELATE TO THE ORDINARY, SOLE OR
         CONTRIBUTORY NEGLIGENCE, GROSS NEGLIGENCE, WILLFUL MISCONDUCT OR
         VIOLATION OF LAW BY THE COMPANY, ITS SUBSIDIARIES, OFFICERS,
         DIRECTORS, EMPLOYEES AND AGENTS.





                                      -27-
<PAGE>   28
         IN WITNESS WHEREOF, each of the parties has hereunto executed this
Agreement, or caused this Agreement to be executed on its behalf, as of the
date first above written.

                                        THE SAM K. VIERSEN JR. TRUST DATED
                                           SEPTEMBER 9, 1986 AS AMENDED AND
                                           RESTATED ON MAY 11, 1994
                                                                        "Seller"


                                        By           /s/ PAUL MINDEMAN 
                                          --------------------------------------
                                                 Paul Mindeman, President of
                                                The Trust Company of Oklahoma
                                                       Successor Trustee


                                        UTI ENERGY CORP.
                                                                         "Buyer"


                                        By       /s/ VAUGHN E. DRUM
                                          --------------------------------------
                                        Print Name:  Vaughn E. Drum
                                                   -----------------------------
                                        Print Title: President
                                                    ----------------------------



                                      -28-
<PAGE>   29
                                  ATTACHMENT A

                                  DEFINITIONS

In addition to other terms specifically defined elsewhere in this Agreement,
the following terms shall have the meanings assigned to them below.

"ACCOUNTS PAYABLE AND ACCRUED LIABILITIES" shall have the meaning given such
term in Section 4.2.

"ADVERSE CONSEQUENCES" shall mean all actions, suits, proceedings,
investigations, charges, complaints, claims, demands, judgments, orders,
decrees, rulings, damages, fines, penalties, costs, amounts paid in settlement,
liabilities, losses and expenses, including court costs and reasonable
attorneys' fees and expenses, suffered by a Person, but shall not include any
loss of profits, indirect, consequential or punitive damages (unless incurred
in connection with a Third Party Claim) and shall be net of any insurance
proceeds.

"AFFILIATE" of any person or entity shall mean any other person or entity that,
directly or indirectly, controls, is controlled by, or is under common control
with such person or entity.

"AGREEMENT" shall have the meaning set forth in the opening paragraph.

"ASSETS" shall have the meaning set forth in Section 2.1.6.

"BASIS" means any past or present fact, situation, circumstance, status,
condition, activity, practice, plan, occurrence, event, incident, action,
failure to act, or transaction that forms or could form the basis for the
matter to which it relates.

"BENEFIT PLANS" shall have the meaning given such term in Section 21.8.

"BUYER" shall have the meaning set forth in the opening paragraph.

"BUYER INDEMNITEES" shall have the meaning given such term in Section 6.2.

"CASUALTY EVENT" shall have the meaning set forth in Section 1.8.

"CASUALTY NOTICE" shall have the meaning set forth in Section 1.8.

"CLOSING" shall mean the consummation of the transactions described and
contemplated by this Agreement.

"CLOSING DATE" shall mean August 8, 1996, or such other date as may be mutually
agreed to by the parties.

"COBRA" means the Congressional Omnibus Budget Reconciliation Act.

"CODE" shall mean the Internal Revenue Code of 1986, as amended.

"COLLATERAL DOCUMENTS" shall have the meaning set forth in Section 1.2.2.

"COMPANY" shall mean the Viersen & Cochran Drilling Company, an Oklahoma
corporation.





                                      -29-
<PAGE>   30
"COMPANY RELEASED PARTIES" shall have the meaning given such term in Section
8.5 below.

"CONFIDENTIAL INFORMATION" shall mean any information concerning the businesses
and affairs of the Company that is not already generally available to the
public and shall further have the meaning and shall encompass the
confidentiality obligations set forth in that certain letter from Buyer to
Seller dated May 21, 1996 the terms of which are incorporated herein by
reference.

"DEMAND FOR ARBITRATION" shall have the meaning set forth in Section 7.7.

"DISCLOSURE SCHEDULE" means one of the series of schedules of data or
information provided to Buyer by Seller on the date of this Agreement, each of
which constitutes an integral part of this Agreement.

"EMPLOYEE LIABILITIES" means any obligations under law, such as COBRA, that the
Company has to persons who were employees of the Company prior to the Closing
Date, arising as a result of such employment prior to the Closing Date.

"ENVIRONMENTAL, HEALTH AND SAFETY LAWS" shall mean the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, the Resource
Conversation and Recovery Act of 1976, the Occupational Safety and Health Act
of 1970, the Outer Continental Shelf Lands Act, the Clean Water Act, the Oil
Pollution Act, the Clean Air Act, and the Hazardous Materials Transportation
Act, each as amended, together with all other laws (including rules,
regulations, codes, plans, injunctions, common law judgments, orders, decrees,
rulings and charges thereunder) of foreign, federal, state, and local
governments (and all agencies thereof) concerning pollution or protection of
the environment (including, without limitation, ambient air, surface water,
ground water, land surface or subsurface strata), public health and safety, or
employee health and safety, including laws relating to emissions, discharges,
releases or threatened releases of pollutants, contaminants, or chemical,
industrial, hazardous or toxic materials or wastes into ambient air, surface
water, ground water or lands, or otherwise relating to the manufacture,
processing, distribution, use, treatment, storage, disposal, transport or
handling of pollutants, contaminants, or chemical, industrial, hazardous or
toxic materials or wastes.

"ENVIRONMENTAL LIABILITIES" means any and all costs (including remedial,
removal, response, abatement, cleanup, investigative, and/or monitoring costs),
damages, settlements, expenses, liens, penalties, fines, taxes, prejudgment and
post-judgment interest, court costs and attorneys' fees incurred or imposed (i)
pursuant to any agreement, order, notice of responsibility, directive
(including directives or requirements embodied in Environmental, Health and
Safety Laws), injunction, judgment or similar documents (including settlements)
attributable to or arising out of or under Environmental, Health and Safety
Laws, or (ii) pursuant to any claim by a government authority or other entity
or person for personal injury, property damage, damage to natural resources,
remediation or response costs arising out of or attributable to any
manufacture, processing, distribution, use, treatment, storage disposal,
transport or handling of any material or substance designated or regulated as a
dangerous, harmful, hazardous or toxic material or substance under any
Environmental, Health and Safety Law.

"ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
amended.

"ESCROW AGREEMENT" shall have the meaning set forth in Section 6.7.

"EXCLUDED ASSETS" shall mean those Assets set forth in Section 4.1 of the
Disclosure Schedule.

"FAIR MARKET VALUE" of any Asset shall mean the value that would be obtained in
an arm's length transaction between an informed and willing buyer and an
informed and willing seller, determined by





                                      -30-
<PAGE>   31
the agreement of Seller and Buyer or by appraisal as hereinafter provided.  If
the Fair Market Value of any Asset must be determined, Seller shall submit to
Buyer an estimate of the Fair Market Value of such Asset, and Seller and Buyer
shall consult for the purpose of determining the Fair Market Value of such
Asset.  If, on or before the fifteenth calendar day after Seller shall have
provided such an estimate, Seller and Buyer shall not have reached agreement on
the Fair Market Value of such Asset, Seller shall designate, on or before the
fifteenth calendar day after the expiration of such 15-day period, five
nationally recognized appraisal firms with which Seller has not conducted
business within the three years previous thereto.  Buyer shall select, on or
before the tenth calendar day after such designation, one of such appraisal
firms to conduct an appraisal of such Asset, and the Fair Market Value of such
Asset shall be determined by such appraisal firm as promptly as possible (and
in any event on or before the thirtieth calendar day thereafter).  The cost of
such appraisal shall be paid in equal proportions by Seller and Buyer.  Seller
shall provide to Buyer and, if applicable, such appraisal firm, all information
reasonably requested by Buyer or such appraisal firm, as the case may be, to
determine the Fair Market Value of such Asset.

"FINANCIAL STATEMENTS" shall mean the unaudited, internally prepared financial
statements of the Company for the period ended June 30, 1996.

"GOVERNMENTAL AUTHORITY" shall mean any federal, state, local, foreign or other
governmental or administrative authority, agency, court, tribunal, arbitrator,
commission, board or bureau.

"INDEMNIFIED PARTY" has the meaning set forth in Section 6.4.1.

"INDEMNIFIED PARTY" has the meaning set forth in Section 6.4.1.

"LAW" shall mean any applicable statute, rule, regulation, order, judgement,
decree, pronouncement, agreement or finding of any Governmental Authority.

"LIABILITY OR LIABILITIES" shall mean any liability or other obligation
(whether known or unknown, asserted or unasserted, absolute or contingent,
accrued or unaccrued, liquidated or unliquidated, or due or to become due).

"ORDINARY COURSE OF BUSINESS" shall mean with respect to any Person, the
ordinary course of business of such Person consistent with past custom and
practice.

"PBGC" shall have the meaning set forth in Section 2.1.18.

"PENSION PLANS" shall have the meaning set forth in Section 2.1.18.

"PERSON" shall mean any individual, corporation, partnership, association,
joint stock company, trust, joint venture, unincorporated organization,
business or Governmental Authority, or other entity.

"POST-CLOSING TAX PERIOD" shall have the meaning set forth in Section 4.4.

"PRE-CLOSING TAX PERIOD" shall have the meaning set forth in Section 4.4.

"PURCHASE PRICE" shall have the meaning set forth in Section 1.2.

"SECURITIES ACT" shall mean the Securities Act of 1933, as amended.





                                      -31-
<PAGE>   32
"SECURITY INTEREST" shall mean any lien, charge, encumbrance, mortgage,
covenant, assessment, restriction, option, conditional sale agreement, title
retention agreement, financing lease, pledge or security interest of any kind
or type and whether arising by contract or under law.

"SECURITY AGREEMENT" shall have the meaning set forth in Section 1.2.2.

"SECURED NOTE" shall have the meaning set forth in Section 1.2.2.

"SELLER" shall have the meaning set forth in the opening paragraph.

"SELLER INDEMNITEES" shall have the meaning set forth in Section 6.3.

"SELLER'S KNOWLEDGE" means the actual knowledge of (i) the Trustee of Seller
who is under no obligation to make any independent investigation beyond due
inquiry of the President of the Company, (ii) the President of the Company and
(iii) James L. Woods.

"SHARES" shall have the meaning set forth in the recitals to this Agreement.

"SURVIVAL PERIOD" shall mean 15 months from the Closing Date, provided,
however, the Survival Period for the representations under Sections 2.1.5,
2.1.13, 2.1.18 and 2.1.19 (and any indemnified claims therefor) shall be the
same as the applicable statute of limitations for such claims as provided by
law and the representations under Section 2.1.3 shall survive without
limitation.

"TAX" or "TAXES" shall mean any federal, state, local, or foreign income, gross
receipts, license, payroll, employment, excise, severance, environmental
(including taxes under Code Sec. 59A), customs duties, capital stock,
franchise, occupation, business, profits, withholding, social security (or
similar) employment, unemployment, disability, real property, personal
property, ad valorem, sales, use, transfer, registration, alternative or add-on
minimum, estimated, or other tax, assessment, duty, fee, levy or other
governmental charge of any kind whatsoever, including any interest, fine,
penalty or addition thereto, whether disputed or not.

"TAX RETURNS" shall mean any return, declaration, report, form, claim for
refund, or information return or statement relating to Taxes, including any
schedule or attachment thereto, and including any amendment thereof.

"THIRD PARTY CLAIM" has the meaning set forth in Section 6.4.1.

"TRUSTEE" shall mean The Trust Company of Oklahoma.

"WARRANTS" shall have the meaning set forth in Section 1.2.3.





                                      -32-
<PAGE>   33
                                  ATTACHMENTS


"A"      Definitions

"B"      Form of Secured Note

"C"      Form of Guaranty Agreement

"D"      Form of Security Agreement

"E"      Form of Warrant

"F"      Lease Agreement and Option to Purchase

"G"      Escrow Agreement





                                      -33-

<PAGE>   1


                                                                     EXHIBIT 4.1

                                PROMISSORY NOTE


$8,000,000.00                   Houston, Texas                   August 14, 1996


         FOR VALUE RECEIVED, the undersigned, UTI Energy Corp., a Delaware
corporation ("Maker"), hereby promises to pay to the order of The Trust Company
of Oklahoma Successor Trustee of The Sam K. Viersen Jr. Trust dated September
9, 1986 as Amended and Restated on May 11, 1994 (the "Payee"), in Tulsa,
Oklahoma, at the offices of Trust Company of Oklahoma, 5727 South Lewis Avenue,
Tulsa, Oklahoma  74136, on or before August 14, 1998 (the "Maturity Date"), in
lawful money of the United States of America, the principal amount of EIGHT
MILLION AND NO/100 DOLLARS ($8,000,000.00), together with interest on the
unpaid balance of said principal amount from time to time remaining
outstanding, from the date hereof until maturity (howsoever such maturity shall
occur), in like money, at said office, at a rate per annum equal to 6%.

         All past due principal of and interest on this Note shall bear
interest from the due date thereof (whether by acceleration or otherwise) until
paid at a per annum rate equal to 6%.

         Subject to Maker's right of set-off described below, the outstanding
principal balance of this Note shall be due and payable as follows:

         1.      On August 14, 1997 (or, if not a Business Day (hereinafter
                 defined), the first Business Day thereafter), a principal
                 payment of $1,500,000.00, together with accrued and unpaid
                 interest as of such date;

         2.      On February 14, 1998 (or, if not a Business Day, the first
                 Business Day thereafter), a principal payment of
                 $1,500,000.00, together with accrued and unpaid interest as of
                 such date; and

         3.      On the Maturity Date (or, if not a Business Day, the first
                 Business Day thereafter), all outstanding principal, together
                 with accrued and unpaid interest as of such date.

The foregoing notwithstanding, all unpaid accrued interest on this Note, and
the outstanding unpaid principal balance hereof, shall be immediately due and
payable in full upon the maturity of the principal of this Note, whether by
acceleration or otherwise.  "Business Day" shall mean any day on which banks
are open for general banking business in the State of Texas, other than on
Saturday, Sunday, a legal holiday or any other day on which banks in the State
of Texas are required or authorized by law or executive order to close.

         Maker shall have the right and privilege of prepaying this Note, in
whole or in part, at any time or from time to time without premium or penalty
or notice to the holder hereof.  All amounts prepaid shall be applied first to
earned, accrued and unpaid interest and the balance, if any, shall be applied
to the payment of principal.  As an incentive to Maker to prepay this Note, if
the Maker prepays $7,650,000.00 principal amount of this Note, together with
accrued





                               PAGE 1 OF 3 PAGES
<PAGE>   2
and unpaid interest, on or before February 14, 1997, this Note shall be paid in
full, and Maker shall have no further obligation, and Payee shall have no
further rights, hereunder.  In the event of such prepayment, the difference
between the face amount of this Note and $7,650,000.00 shall, for all purposes,
be deemed to be a downward adjustment to the Purchase Price, as that term is
defined in that certain Stock Purchase Agreement dated August 14, 1996, by and
between Maker and Payee (the "Stock Purchase Agreement").

         If any one of the following events shall occur and be continuing (an
"Event of Default"):

                 (a)      Maker shall fail to pay timely when due, the
         principal of, or accrued unpaid interest on, this Note, which shall
         remain uncured for 5 days after such due date; or

                 (b)(i)   Default shall be made in the due observance or
         performance of, or compliance with, any of the covenants or agreements
         contained herein or (ii) the occurrence of any event or circumstance
         which constitutes an "event of default" under any security agreement
         or other instrument securing payment hereof, which shall remain
         uncured for 20 days after notice to Maker; or

                 (c)      Maker shall (i) apply for or consent to the
         appointment of a receiver, trustee, custodian or liquidator of it or
         of all or a substantial part of its property, or (ii) generally fail
         to pay its debts as they come due in the ordinary course of business,
         or (iii) commence, or file an answer admitting the material
         allegations of or consenting to, or default in a petition filed
         against it in, any case, proceeding or other action under any existing
         or future law of any jurisdiction, domestic or foreign, relating to
         bankruptcy, insolvency, reorganization or relief of debtors, or
         seeking to have an order for relief entered with respect to it under
         the federal Bankruptcy Code 11 USC Section 101 et. seq., or seeking
         reorganization, arrangement, adjustment, winding-up, liquidation,
         dissolution, composition or the similar relief with respect to it or
         its debt; or

                 (d)      A receiver, conservator, liquidator, custodian or
         trustee of Maker or any of its property is appointed by the order or
         decree of any court or agency or supervisory authority having
         jurisdiction; or Maker obtains an order for relief under the federal
         Bankruptcy Code 11 USC Section 101 et. seq.; or any of the property of
         Maker is sequestered by court order; or a petition is filed or a
         proceeding is commenced against Maker under any bankruptcy,
         reorganization, arrangement, insolvency, readjustment of debt,
         dissolution or liquidation law of any jurisdiction, whether now or
         hereafter in effect, which remains unstayed and in effect for 60
         consecutive days,

then the Payee, at its option, may declare the unpaid principal portion of this
Note to be forthwith due and payable, whereupon the said portion of this Note
and all accrued, earned and unpaid interest shall become immediately due and
payable by Maker without demand, presentment for payment, notice of
non-payment, protest, notice of protest, notice of intent to accelerate
maturity, notice of acceleration of maturity or any other notice of any kind to
Maker, or any other person liable hereon or with respect hereto, all of which
are hereby expressly





                               PAGE 2 OF 3 PAGES
<PAGE>   3
waived by Maker and each other person liable hereon or with respect hereto,
anything contained herein or in any other documents or instruments to the
contrary notwithstanding; and upon the happening of any Event of Default
referred to in paragraphs (c) or (d), the unpaid principal portion of this Note
and all other interest on this Note then accrued, earned and unpaid shall
become automatically due and payable by Maker without demand, presentment for
payment, notice of nonpayment, protest, notice of protest, notice of intent to
accelerate maturity, notice of acceleration of maturity or any other notice of
any kind to Maker or any other person liable hereon or with respect hereto, all
of which are expressly waived by Maker and each other Person liable hereon or
with respect hereto, anything contained herein or in any document or instrument
to the contrary notwithstanding.

         As provided in the Stock Purchase Agreement, Maker shall have the
right to set-off, apply and reduce against its obligations hereunder (principal
or interest, at the option of the Maker) any amounts owing by Payee to Maker as
a result of Payee's indemnity obligations under the Stock Purchase Agreement.
Maker will give written notice to Payee of any exercise of said set-off,
including the amount owed Maker by Payee under Article VI of the Stock Purchase
Agreement that Maker desires to set-off against principal or interest owed by
Maker hereunder; provided, however, the failure to give such notice shall in no
manner affect the right of Maker in respect to set-offs and corresponding
applications of funds.

         This Note is secured by all security agreements, collateral
assignments and lien instruments executed by the Maker in favor of Payee, or
executed by any other party as security for this Note, including without
limitation, security agreement(s) of even date herewith by Maker in favor of
Payee.

         This Note shall be governed by and construed in accordance with the
internal laws of the State of Oklahoma and applicable federal laws of the
United States of America.  This Note has been delivered and accepted and is
payable at Tulsa, Oklahoma.

         EXECUTED AND EFFECTIVE as of the day and year first above written.

                                        MAKER:

                                        UTI ENERGY CORP.


                                        By:         /s/  VAUGHN E. DRUM
                                           -------------------------------------
                                                  Name:  Vaughn E. Drum
                                                       -------------------------
                                                  Title: President
                                                        ------------------------



                               PAGE 3 OF 3 PAGES

<PAGE>   1


                                                                     EXHIBIT 4.2

                        HYPOTHECATION/SECURITY AGREEMENT




         THIS HYPOTHECATION SECURITY AGREEMENT ("Security Agreement") is made
and entered into as of this 14th day of August, 1996, by Viersen & Cochran
Drilling Company, an Oklahoma corporation, with its chief place of business
office located at 485 Devon Park Drive, #112, Wayne, Pennsylvania 19087
(hereinafter called "Debtor"), in favor of The Sam K.  Viersen, Jr. Trust dated
September 9, 1986 as Amended and Restated  on May 11, 1994, located at the
offices of The Trust Company of Oklahoma, 5727 South Lewis Avenue, Tulsa,
Oklahoma 74136 (hereinafter called "Secured Party").

                                  WITNESSETH:

         WHEREAS, UTI Energy Corp., a Delaware corporation, executed a
Promissory Note dated on even date herewith ("Note") in favor of Secured Party
as partial consideration for the purchase by Utico, Inc., a wholly owned
subsidiary of Borrower, from Secured Party of all the outstanding common stock
of Debtor (the "Stock Acquisition"); and

         WHEREAS, Debtor executed a Guaranty Agreement dated on even date
herewith, guaranteeing Borrower's payment of the Note (the "Guaranty"); and

         WHEREAS, it was a condition to Secured Party's accepting the Note from
Borrower and the Guaranty from Debtor that Debtor execute and deliver this
Security Agreement, and Debtor has agreed to enter into this Security
Agreement;

         NOW, THEREFORE, (i) for and in consideration of the premises and the
agreements herein contained, and (ii) for other good and valuable
consideration, the receipt and sufficiency of all of which is hereby
acknowledged, Debtor hereby agrees with Secured Party as follows:

                                   ARTICLE I

                                 GENERAL TERMS

         Section 1.01     TERMS DEFINED ABOVE.  As used in this Security
Agreement, the terms "Security Agreement", "Debtor", "Secured Party",
"Borrower", "Stock Acquisition", "Guaranty" and "Note" shall have the meanings
indicated above.

         Section 1.02      DEFINITIONS CONTAINED IN THE NOTE.  Unless otherwise
defined herein, all terms beginning with a capital letter which are defined in
the Note shall have the same meanings herein as therein unless the context
hereof otherwise requires.

         Section 1.03     CERTAIN DEFINITIONS.  As used in this Security
Agreement, the following terms shall have the following meanings, unless the
context otherwise requires:

         "CODE" shall mean the Uniform Commercial Code as presently in effect
         in the State of Oklahoma, Title 12A, Sections 1.101-11.105, Sections
         1.101-11.108.

         "COLLATERAL" shall have the meaning given such term in Section 2.01
         hereof.

         "DEFAULT" shall mean the occurrence of any of the events specified
         herein or in the Note or the Guaranty as a "default", whether or not
         any requirement for notice or lapse of time or other condition
         precedent has been satisfied.
<PAGE>   2
         "EQUIPMENT" shall have the meaning given such term in Section 2.01
         hereof.

         "EVENT OF DEFAULT" shall mean the occurrence of any of the events
         specified in Section 5.01, provided that any requirement for notice or
         lapse of time or other condition precedent has been satisfied.

         "INDEBTEDNESS" shall mean all obligations and liabilities of any kind
         owed or to be owed, whether now existing or hereafter arising, by
         Debtor to Secured Party under the Guaranty.

         "OBLIGATIONS" shall have the meaning given such term in Section 2.02
         hereof.

         "SECURITY AGREEMENT" shall mean this Security Agreement, as the same
         may from time to time be amended or supplemented.

         Section 1.04     TERMS DEFINED IN CODE.  All terms used herein, not
otherwise defined herein, which are defined in the Code shall have the same
meaning herein unless the context otherwise requires.

                                   ARTICLE II

                               SECURITY INTEREST

         Section 2.01     GRANT OF SECURITY INTEREST.  Debtor hereby grants to
Secured Party a security interest in, and a general lien upon all of the
equipment described more fully on Exhibit "A" attached hereto, including the
proceeds, products, additions to, substitutions for and accessions of any and
all of said equipment, excluding, however, any lease payments received in
respect of said equipment (collectively the "Collateral").

         Section 2.02     OBLIGATIONS SECURED.  The security interest in, and
general lien upon, the Collateral is granted to secure the payment of all
Indebtedness of Debtor to Secured Party now or hereafter existing under or in
connection with the Guaranty and any and all renewals, extensions for any
period or rearrangements thereof, and out-of- pocket costs, expenses and
reasonable attorneys' fees and collection expenses in accordance with the
Guaranty and this Security Agreement ((herein collectively called the
"Obligations").

                                  ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         In order to induce Secured Party to accept this Security Agreement,
Debtor represents and warrants to Secured Party that:

         Section 3.01     OWNERSHIP AND LIENS.  Since the Stock Acquisition,
except for the security interest of Secured Party granted in this Security
Agreement, Debtor has not granted any security interest in, or otherwise
encumbered, the Collateral, and, except for any liens, adverse claims and
options existing prior to the Stock Acquisition, Debtor has no knowledge of any
other liens, adverse claims or options burdening the Collateral.





                                      -2-
<PAGE>   3
         Section 3.02     SECURED PARTY'S SECURITY INTEREST.  This Security
Agreement creates a valid and binding security interest in the Collateral
securing the Obligations.  All filings and other actions now or hereafter
necessary or desirable by Secured Party on the part of the Debtor to perfect or
protect such security interest will be promptly taken by Debtor upon the
request of Secured Party.

                                   ARTICLE IV

                            COVENANTS AND AGREEMENTS

         From the date hereof and for so long as any part of the Indebtedness
is outstanding, Debtor will comply with the covenants contained in this Article
IV.

         Section 4.01     TITLE; PROHIBITED LIENS AND FILINGS.  Except for the
security interest to the Secured Party (or to the extent a security interest
existed with respect to the Collateral prior to the Stock Acquisition), Debtor
will not pledge, mortgage, otherwise encumber, create or suffer a lien to exist
on any of the Collateral. Debtor will not file or permit to be filed or
recorded any financing statement or other security instrument with respect to
the Collateral other than in favor of Secured Party.

         Section 4.02     DISPOSITION OF COLLATERAL.  Debtor may sell, transfer
or otherwise dispose of ("Sell") Collateral (excluding for this purpose
transfers pursuant to Section 4.08 hereof) having an aggregate Section 4.02
Calculation Amount (hereinafter defined) not in excess of $2,000,000; provided
that to the extent the cumulative Section 4.02 Calculation Amount for all
Collateral sold pursuant to this Section 4.02 through such date (after giving
effect to such Sale) shall exceed the cumulative sales proceeds received by
Debtor from such Sales by more than $300,000, Debtor shall have 45 days to
restore such relationship (either through the Sale of additional Collateral or
by prepaying the Note in an amount equal to the excess over $300,000 (which
prepayment shall be considered sales proceeds for purposes of future
calculations under this proviso).  To the extent Debtor Sells Collateral (other
than pursuant to Section 4.08 hereof) having an aggregate Section 4.02
Calculation Amount (hereinafter defined) in excess of $2,000,000, Debtor shall
apply the Net Proceeds from such sale(s) (hereinafter defined) to reduce the
principal amount of the Note, and, to the extent the cumulative Section 4.02
Calculation Amount for all Collateral sold pursuant to this Section 4.02
through such date (after giving effect to such Sale) shall exceed the
cumulative sales proceeds received by Debtor from such Sales by more than
$300,000, Debtor shall have 45 days to restore such relationship (either
through the Sale of additional Collateral or by prepaying the Note in an amount
equal to the excess over $300,000 (which prepayment shall be considered sales
proceeds for purposes of future calculations under this proviso).  "Section
4.02 Calculation Amount" shall mean the amount set forth opposite such item on
Exhibit "A" hereto.  "Net Proceeds" shall mean the gross proceeds received by
Debtor from such Sale less selling expenses paid to unrelated third parties.
In connection with a Sale of Collateral pursuant to the terms of this Section
4.02, Secured Party agrees to timely provide appropriate releases with respect
thereto as may be reasonably requested by Debtor.  Except as set forth above or
pursuant to Section 4.08, Debtor may not sell, assign or otherwise dispose of
any Collateral.

         Section 4.03     TAXES.  Debtor agrees to pay prior to delinquency all
taxes, charges, liens and assessments against the Collateral.





                                      -3-
<PAGE>   4
         Section 4.04     INSPECTION OF COLLATERAL.  Secured Party may from
time to time, and upon request and during regular business hours, inspect the
Collateral.

         Section 4.05     EXPENSES.  Debtor agrees to pay to Secured Party at
Secured Party's offices, all out-of-pocket costs and expenses (including
reasonable attorneys' fees and legal expenses) incurred by Secured Party in
connection with protecting Secured Party against the claims or interests of any
person against the Collateral (except to the extent such claims or interests
relate to events occurring prior to the Stock Acquisition), and in exercising
any right, power or remedy conferred by this Security Agreement or by law or in
equity.  The amount of all such costs and expenses shall be due and payable by
Debtor to Secured Party upon submission of documentation evidencing such
payment or incurrence by Secured Party.

         Section 4.06     TRANSFER OF LOCATION.  No part of the Collateral
shall be moved outside the states of Texas, Louisiana, New Mexico, Oklahoma, or
Pennsylvania unless Debtor gives written notice of such move, and no part of
the Collateral shall be moved outside the 48 contiguous states of the United
States without the prior written consent of Secured Party.  Each such notice
shall include specific legal descriptions to enable the parties to maintain the
Secured Party's security interest in such Collateral following such move and
shall identify the approximate date upon which the move will occur and the
method of transportation.  Debtor shall be responsible to ensure that the
Collateral that is being moved is insured from any loss during transportation
and at the new location.  Debtor agrees to timely execute and deliver
additional UCC financing statements or other documents that Secured Party may
reasonably request as to any of the Collateral which is moved during the term
of this Security Agreement to ensure continued perfection of Secured Party's
security interest in such Collateral.

         Section 4.07     MAINTENANCE OF COLLATERAL GENERALLY.  Debtor will
maintain the Collateral in at least the condition, repair and working order as
exists on the date of this Security Agreement, ordinary wear and tear excepted.

         Section 4.08     TRANSFER OF COLLATERAL TO AFFILIATES.  Debtor may
sell, assign or transfer any Collateral to any affiliate of Borrower provided
that (i) Secured Party's security interest in the Collateral continues as a
first priority security interest therein, and (ii) such affiliate agrees, in
writing, to be bound by the terms of this Security Agreement with respect to
such Collateral and evidence of such agreement is provided to Secured Party.

         Section 4.09     FURTHER ASSURANCES.  Debtor will, from time to time,
sign, execute, deliver and file, alone or with the Secured Party, any financing
statements, security agreements or other documents and take all further action
that may be reasonably requested by Secured Party by way of further assurance
to Secured Party of the matters and things herein provided for.

                                   ARTICLE V

                          RIGHTS, REMEDIES AND DEFAULT

         Section 5.01     EVENTS OF DEFAULT.  Any of the following events shall
be considered an "event of default" under this Security Agreement:

                 (a)      default is made in the payment when due of any of the
         Indebtedness after giving effect to any grace periods therefor; or





                                      -4-
<PAGE>   5
                 (b)      any representation or warranty of Debtor herein is
         determined to be false or misleading in any material respect; or

                 (c)      an event of default occurs under the Note or the
         Guaranty.

         Section 5.02     DEFAULT REMEDIES.  Upon the happening and during the
continuance of any Event of Default, Secured Party may then, or at any time
thereafter and from time to time, apply, collect, sell in one or more sales,
lease, or otherwise dispose of, any or all of the Collateral, in its then
condition or following any commercially reasonable preparation or processing,
in such order as Secured Party may elect, and any such sale may be made either
at public or private sale at its place of business or elsewhere, in any manner
authorized or permitted under the Code.  If any applicable provision of the
Code or other law requires Secured Party to give reasonable notice of any such
sale or disposition or other action, Debtor hereby agrees ten days' prior
written notice shall constitute reasonable notice.  Secured Party may require
Debtor to assemble the Collateral and make it available to Secured Party at a
place designated by Secured Party which is reasonably convenient to Secured
Party and Debtor.  Any sale hereunder may be conducted by an auctioneer or any
officer or agent of Secured Party.

         Section 5.03     PROCEEDS.  After the happening of any Event of
Default and during the continuance thereof, the proceeds of any sale or other
disposition of the Collateral and all sums received or collected by Secured
party from or on account of the Collateral shall be applied by Secured Party in
the manner set forth in Section 9.504 of the Code.

         Section 5.04     DEFICIENCY.  This Security Agreement shall not be
construed as relieving Debtor from full liability on the Obligations, including
any deficiency as a result of the application of any remedy by Secured Party
under Section 5.02 and 5.03 hereof.

         Section 5.05     SECURED PARTY'S DUTIES.  The powers conferred upon
Secured Party by this Security Agreement are solely to protect its interest in
the Collateral and shall not impose any duty upon Secured Party to exercise any
such powers.  Secured Party shall be under no duty whatsoever to make or give
any presentment, demand for performance, notice of nonperformance, protest,
notice of protest, notice of dishonor, or other notice or demand in connection
with any Collateral or the Obligations, or to take any steps necessary to
preserve any rights against prior parties.  Secured Party shall not be liable
for failure to collect or realize upon any or all of the Obligations or
Collateral, or for any delay in so doing, nor shall Secured Party be under any
duty to take any action whatsoever with regard thereto.  Secured Party shall
use reasonable care in the custody and preservation of any Collateral in its
possession.  Secured Party shall have no duty to comply with any recording,
filing, or other legal requirements necessary to establish or maintain the
validity, priority or enforceability of, or Secured Party's rights in or to,
any of the Collateral.

         Section 5.06     SECURED PARTY'S ACTIONS.  Debtor waives any right to
require Secured Party to proceed against any person, exhaust any Collateral, or
pursue any other remedy in Secured Party's power and waives any and all notice
of creation, modification, rearrangement, renewal or extension for any period
of any of the Obligations from time to time.

         Section 5.07     CUMULATIVE SECURITY.  The execution and delivery of
this Security Agreement in no manner shall impair or affect any other security
(by endorsement or otherwise) for the Obligations.  No security taken hereafter
as security for the Obligations





                                      -5-
<PAGE>   6
shall impair in any manner or affect this Security Agreement.  All such present
and future additional security is to be considered as cumulative security.

         Section 5.08     CONTINUING AGREEMENT.  This is a continuing Security
Agreement and the grant of a security interest hereunder shall remain in full
force and effect and all the rights, powers and remedies of Secured Party
hereunder shall continue to exist until the Indebtedness is paid in full.

         Section 5.09     CUMULATIVE RIGHTS.  The rights, powers and remedies
of Secured Party hereunder shall be in addition to all rights, powers and
remedies given by statute or rule of law and are cumulative.  The exercise of
any one or more of the rights, powers and remedies provided herein shall not be
construed as a waiver of any other rights, powers and remedies of Secured
Party.  Furthermore, regardless of whether or not the Code is in effect in the
jurisdiction where such rights, powers and remedies are asserted, Secured Party
shall have the rights, powers and remedies of a secured party under the Code.

         Section 5.10     EXERCISE OF RIGHTS, ETC.  Time shall be of the
essence for the performance of any act under this Security Agreement or the
Obligations by Debtor, but neither Secured Party's acceptance of partial or
delinquent payments nor any forbearance, failure or delay by Secured Party in
exercising any right, power or remedy shall be deemed a waiver of any
obligation of Debtor or of any right, power or remedy of Secured Party or
preclude any other or further exercise thereof; and no single or partial
exercise of any right, power or remedy shall preclude any other or further
exercise thereof, or the exercise of any other right, power or remedy.

         Section 5.13     REMEDY AND WAIVER.  Secured Party may remedy any
Default without waiving the Default remedied and may waive any Default without
waiving any prior or subsequent Default.

         Section 5.14     NON-JUDICIAL REMEDIES.  The right of Secured Party to
take lawful possession or control of the Collateral upon the occurrence of an
Event of Default may be exercised without resort to any court proceedings or
judicial process whatever and without any hearing whatever thereon.

                                   ARTICLE VI

                                 MISCELLANEOUS

         Section 6.01     CONSTRUCTION.  This Security Agreement has been made
in and the security interest granted hereby is granted in and each shall be
governed by the laws of the State of Oklahoma and of the United States of
America, as applicable, in all respects, including matters of construction,
validity, enforcement and performance.

         Section 6.02     AMENDMENT AND WAIVER.  This Security Agreement may
not be amended (nor may any of its terms be waived) except by written
instrument signed by the party to be bound thereby.

         Section 6.03     INVALIDITY.  If any provision of this Security
Agreement is rendered or declared invalid, illegal or unenforceable by reason
of any existing or subsequently enacted legislation or by a judicial decision
which shall have become final, Debtor and Secured Party





                                      -6-
<PAGE>   7
shall promptly meet and negotiate substitute provisions for those rendered
invalid, illegal or unenforceable, but all of the remaining provisions shall
remain in full force and effect.

         Section 6.04     SURVIVAL OF AGREEMENTS.  All representations and
warranties of Debtor herein, and all covenants and agreements herein not fully
performed before the effective date of this Security Agreement, shall survive
such date.

         Section 6.05     SUCCESSORS AND ASSIGNS.  The covenants and agreements
herein contained by or on behalf of Debtor shall bind Debtor, and Debtor's
successors and assigns and shall inure to the benefit of Secured Party, and its
successors and assigns.

         Section 6.06     TITLES OF ARTICLES, SECTIONS AND SUBSECTIONS.  All
titles or headings to articles, sections, subsections or other divisions of
this Security Agreement are only for the convenience of the parties and shall
not be construed to have any effect or meaning with respect to the other
content of such articles, sections, subsections or other divisions, such other
content being controlling as to the agreement between the parties hereto.

         Section 6.07     COUNTERPARTS.  This Security Agreement may be
executed in two or more counterparts, and it shall not be necessary that the
signatures of all parties hereto be contained on any one counterpart hereof;
each counterpart shall be deemed an original, but all of which together shall
constitute one and the same instrument.

         Section 6.08     NOTICES.  All notices, requests, consents and other
communications under this Security Agreement shall be in writing and shall be
deemed to have been delivered on the date personally delivered or on the date
mailed, postage prepaid, by certified mail, return receipt requested, if
addressed to the respective parties as set forth in the opening paragraph of
this Security Agreement. Either party hereto may designate a different address
by providing written notice of such new address to the other party hereto.
Copies of all notices to the Secured Party shall be simultaneously delivered or
mailed to Pray, Walker, Jackman, Williamson & Marlar, attention: Donald F.
Marlar, Esq., 900 Oneok Plaza, Tulsa, Oklahoma 74103.

         IN WITNESS HEREOF, Debtor has caused this instrument to be duly
executed as of the date first above written.


                                        VIERSON & COCHRAN DRILLING COMPANY
                                                                        "Debtor"


                                        By:         /s/  VAUGHN E. DRUM
                                           -------------------------------------
                                                  Name:  Vaughn E. Drum
                                                       -------------------------
                                                  Title: President
                                                        ------------------------

                                      -7-

<PAGE>   1





                                                                     EXHIBIT 4.3

NO. 1                                         FOR THE PURCHASE OF 200,000 SHARES


     THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933
               OR THE LAWS OF ANY STATE AND IS NOT TRANSFERRABLE.


                  STOCK PURCHASE WARRANT TO PURCHASE SHARES OF
                        COMMON STOCK OF UTI ENERGY CORP.


         This certifies that, for value received, The Sam K. Viersen Jr. Trust
dated September 9, 1986, as Amended and Restated on May 11, 1994 (the "Holder")
is entitled, subject to the terms and conditions of this Warrant, at any time
or from time to time during the Exercise Period (as hereinafter defined), to
purchase up to 200,000 shares (subject to adjustment pursuant to Section 9
below) of common stock, $.001 par value ("Common Stock"), of UTI Energy Corp.,
a Delaware corporation (the "Company") (the shares of Common Stock issuable
upon exercise of this Warrant, as adjusted under Section 9, being referred to
herein as the "Warrant Shares").

         1.      FORM OF ELECTION.

                 The form of election to purchase shares of Common Stock (the
"Form of Election") shall be substantially as set forth in Exhibit A attached
hereto.  The price per Warrant Share and the number of Warrant Shares issuable
upon exercise of this Warrant are subject to adjustment upon the occurrence of
certain events, all as hereinafter provided.

         2.      EXERCISE PERIOD; EXERCISE OF WARRANT.

                 2.1      Exercise Period.  Subject to the terms of this
         Warrant, the Holder shall have the right, which may be exercised at
         any time or from time to time during the Exercise Period, to purchase
         from the Company the number of fully paid and nonassessable Warrant
         Shares this Warrant at the time represents the right to purchase, and,
         in the event that this Warrant is exercised in respect of fewer than
         all of the Warrant Shares purchasable on such exercise, a new warrant
         evidencing the remaining Warrant Shares that may be purchased shall be
         promptly signed, issued and delivered by the Company to the Holder
         pursuant to the provisions of this Section 2.  The term "Exercise
         Period" shall mean the period commencing on August 14, 1996, and
         terminating at 5:00 p.m. (central time) on August 14, 1998.

                 2.2      Exercise of Warrant.  This Warrant may be exercised
         upon surrender to the Company at its principal office (as designated
         in Section 13) of this Warrant, together with the Form of Election
         duly completed and signed, and upon payment to the Company of the
         Warrant Price (as defined in and determined in accordance with the
         provisions of Sections 3 and 9 hereof) for the number of Warrant
         Shares in respect of which this Warrant is then exercised.  Payment of
         the aggregate Warrant Price with respect to the portion of this
         Warrant being exercised shall be made in cash or by certified or
         official bank check, payable to the order of the Company.

                 Subject to Section 6 hereof, upon the surrender of this
         Warrant and payment of the Warrant Price as set forth above, the
         Company shall issue and cause to be delivered to the Holder or, upon
         the written order of the Holder, to and in such name or names as the
         Holder may designate, a certificate or certificates for the number of
         full Warrant Shares so purchased upon the exercise of this Warrant.
         Such certificate or certificates shall be deemed to have been issued
         and any person so designated to be named
<PAGE>   2


         therein shall be deemed to have become a holder of record of such
         Warrant Shares as of the date of the surrender of this Warrant and
         payment of the Warrant Price, as aforesaid.

         3.      WARRANT PRICE.

                 The price per share at which Warrant Shares shall be
purchasable upon exercise of this Warrant initially shall be $15.00 and shall
be subject to adjustment pursuant to Section 9 hereof (such price as so
adjusted is referred to herein as the "Warrant Price").

         4.      EXCHANGE OF WARRANT.

                 This Warrant may be exchanged at the option of the Holder when
surrendered at the principal office of the Company for another warrant, or
other warrants of different denominations, of like tenor and representing in
the aggregate the right to purchase a like number of Warrant Shares as this
Warrant then entitles the Holder to purchase.  Any Holder desiring to exchange
this Warrant shall make such request in writing delivered to the Company, and
shall surrender this Warrant for exchange.  Thereupon, the Company shall
promptly sign and deliver to the person entitled thereto a new warrant or
warrants, as the case may be, as so requested.

         5.      NO REGISTRATION OF WARRANT.

                 This Warrant has not been registered under the Securities Act
of 1933, as amended (the "Securities Act"), or any applicable state securities
laws.  The Holder represents and agrees that this Warrant and, upon exercise
hereof, any Warrant Shares have been acquired for investment and not with a
view to distribution or resale.  The Holder further acknowledges and agrees
that this Warrant may not be transferred, and the Warrant Shares, upon exercise
of this Warrant, may not be transferred without an effective registration
statement therefor under the Securities Act and applicable state securities
laws or an opinion of counsel satisfactory to the Company that registration is
not required thereunder.  Unless registered, any Warrant Shares shall bear the
following legend:

         The securities represented by this certificate have not been
         registered under the Securities Act of 1933 or the laws of any state
         and may not be transferred in the absence of an effective registration
         statement for the securities under the Securities Act of 1933 and
         applicable state laws or an opinion of counsel reasonably satisfactory
         to the Company that such registration is not required.

         6.      PAYMENT OF TAXES.

                 The Company will pay when due and payable any and all U.S.
federal and state transfer taxes and charges that may be payable in respect of
the issuance or delivery of this Warrant or of any Warrant Shares upon the
exercise of this Warrant.  The Company shall not, however, be required to (i)
pay any transfer tax that may be payable in respect of any transfer involved in
the issuance or delivery of certificates for Warrant Shares in the name other
than that of the Holder or (ii) to issue or deliver any certificates for
Warrant Shares upon the exercise of this Warrant until such tax shall have been
paid (any such tax being payable by the Holder at the time of surrender) or
until it has been established to the Company's reasonable satisfaction that no
such tax is due.
<PAGE>   3


         7.      MUTILATED OR MISSING WARRANT.

                 In case this Warrant shall be mutilated, lost, stolen or
destroyed, the Company shall execute, issue and deliver in exchange and
substitution for and upon cancellation of the mutilated Warrant, or in lieu of
and substitution for the Warrant lost, stolen or destroyed, a new warrant of
like tenor and representing an equivalent right or interest; but only upon
receipt of evidence reasonably satisfactory to the Company of such loss, theft
or destruction of this Warrant and indemnity, if requested, satisfactory to the
Company.  The Holder requesting such a substitute warrant shall also comply
with such other reasonable regulations and pay such other reasonable charges as
the Company may prescribe.

         8.      RESERVATION OF WARRANT SHARES; PURCHASE OF WARRANT BY THE
                 COMPANY.

                 8.1      Reservation of Warrant Shares.  The Company shall at
         all times reserve for issuance from its authorized and unissued shares
         of Common Stock the number of shares of Common Stock needed for
         issuance upon the exercise of this Warrant.  The Company covenants
         that all shares of Common Stock issuable as herein provided shall,
         when so issued, be duly and validly issued, fully paid and
         nonassessable.

                 8.2      Purchase of Warrant by the Company.  The Company
         shall not be prohibited, except as limited by law, any other agreement
         or herein, from offering to purchase, purchasing or otherwise
         acquiring this Warrant from any holder thereof at such times, in such
         manner and for such consideration as the Company and such holder may
         agree to.

                 8.3      Cancellation of Purchased or Acquired Warrant.  In
         the event the Company shall purchase or otherwise acquire this
         Warrant, the same shall thereupon be canceled and retired.

         9.      ADJUSTMENT OF WARRANT PRICE AND NUMBER OF WARRANT SHARES.

                 9.1      Mechanical Adjustments.  The existence of this
         Warrant shall not affect in any way the right or power of the Company
         or its stockholders to make or authorize any or all adjustments,
         recapitalizations, reorganizations or other changes in the Company's
         capital structure or its business, or any merger or consolidation of
         the Company, or any issue of bonds, debentures, preferred or prior
         preference stock ahead of or affecting the Common Stock or the rights
         thereof, or the dissolution or liquidation of the Company, or any sale
         or transfer of all or any part of its assets or business, or any other
         corporate act or proceeding, whether of a similar character or
         otherwise.

                 If the Company shall effect a subdivision (by stock split,
         stock dividend, recapitalization or otherwise) or consolidation (by
         reverse stock split or otherwise) of shares or other capital
         adjustment of, or the payment of a dividend in capital stock or other
         equity securities of the Company on, its Common Stock, or other
         increase or reduction of the number of shares of the Common Stock
         without receiving consideration therefor in money, services, or
         property, or the reclassification of its Common Stock, in whole or in
         part, into other equity securities of the Company, then the number,
         class and per share price of Warrant Shares shall be appropriately
         adjusted (or in the case of the issuance of equity securities as a
         dividend on, or in a reclassification of, the Common Stock, this
         Warrant shall extend to such other securities) in such a manner as to
         entitle the Holder to receive, upon exercise of this Warrant, for the
         same aggregate cash compensation, the same total number and class or
         classes of shares (or in the case of a dividend of, or
         reclassification into, other equity securities, such other securities)
         it would have held





                                      -3-
<PAGE>   4


         after such adjustment if the Holder had exercised this Warrant in full
         immediately prior to the event requiring the adjustment.  Comparable
         rights shall accrue in the event of successive subdivisions,
         consolidations, capital adjustments, dividends or reclassifications of
         the character described above.

                 If the Company shall distribute to all holders of its shares
         of Common Stock (including any such distribution made to
         non-dissenting stockholders in connection with a consolidation or
         merger in which the Company is the surviving corporation and in which
         holders of shares of Common Stock continue to hold shares of Common
         Stock after such merger or consolidation) evidences of indebtedness or
         cash or other assets (other than cash dividends payable out of
         consolidated retained earnings not in excess of, in any one year
         period, the greater of (a) $.10 per share of Common Stock and (b) two
         times the aggregate amount of dividends per share paid during the
         preceding calendar year and dividends or distributions payable in
         shares of Common Stock or other equity securities of the Company
         described in the immediately preceding paragraph), then in each case
         the Warrant Price shall be adjusted by reducing the Warrant Price in
         effect immediately prior to the record date for the determination of
         stockholders entitled to receive such distribution by the fair market
         value, as determined in good faith by the Board of Directors of the
         Company (whose determination shall be described in a statement filed
         in the Company's corporate records and be available for inspection by
         the Holder) of the portion of the evidence of indebtedness or cash or
         other assets so to be distributed applicable to one share of Common
         Stock; provided that in no event shall the Warrant Price be less than
         the par value of a share of Common Stock.  Such adjustment shall be
         made whenever any such distribution is made, and shall become
         effective on the date of the distribution retroactive to the record
         date for the determination of the stockholders entitled to receive
         such distribution.  Comparable adjustments shall be made in the event
         of successive distributions of the character described above.

                 After the Company shall make a tender offer for, or grant to
         all of its holders of its shares of Common Stock the right to require
         the Company to acquire from such stockholders shares of, Common Stock,
         at a price in excess of the Current Market Price (a "Put Right") or
         the Company shall grant to all of its holders of its shares of Common
         Stock the right to acquire shares of Common Stock for less than the
         Warrant Price (the "Exercise Right") then, in the case of a Put Right,
         the Warrant Price shall be adjusted by multiplying the Warrant Price
         in effect immediately prior to the record date for the determination
         of stockholders entitled to receive such Put Right by a fraction, the
         numerator of which shall be the number of shares of Common Stock then
         outstanding minus the number of shares of Common Stock which could be
         purchased at the Current Market Price for the aggregate amount which
         would be paid if all Put Rights are exercised and the denominator of
         which is the number of shares of Common Stock which would be
         outstanding if all Put Rights are exercised; and, in the case of a
         Purchase Right, the Warrant Price shall be adjusted by multiplying the
         Warrant Price in effect immediately prior to the record date for the
         determination of the stockholders entitled to receive such Purchase
         Right by a fraction, the numerator of which shall be the number of
         shares of Common Stock then outstanding plus the number of shares of
         Common Stock which could be purchased at the Current Market Price for
         the aggregate amount which would be paid if all Purchase Rights are
         exercised and the denominator of which is the number of shares of
         Common Stock which would be outstanding if all Purchase Rights are
         exercised.  In addition, the number of shares subject to this Warrant
         shall be adjusted by multiplying the number of shares then subject to
         this Warrant by a fraction which is the inverse of the fraction used
         to adjust the Warrant Price.  Notwithstanding the foregoing if any
         such Put Rights or Purchase Rights shall terminate without being
         exercised, the Warrant Price and number of shares subject to this
         Warrant shall be appropriately readjusted to reflect the Warrant Price
         and number of shares subject to this Warrant which





                                      -4-
<PAGE>   5


         would have been in effect if such unexercised Rights had never
         existed.  Comparable adjustments shall be made in the event of
         successive transactions of the character described above.

                 After the merger of one or more corporations with or into the
         Company, after any consolidation of the Company and one or more
         corporations, or after any other corporate transaction described in
         Section 424(a) of the Internal Revenue Code of 1986, as amended, the
         Holder, at no additional cost, shall be entitled to receive, upon any
         exercise of this Warrant, in lieu of the number of shares as to which
         this Warrant may then be so exercised, the number and class of shares
         of stock or other equity securities to which the Holder would have
         been entitled pursuant to the terms of the agreement of merger or
         consolidation if at the time of such merger or consolidation the
         Holder had been a holder of a number of shares of Common Stock equal
         to the number of shares as to which this Warrant may then be so
         exercised and, if as a result of such merger, consolidation or other
         transaction, the holders of Common Stock are not entitled to receive
         any shares of Common Stock pursuant to the terms thereof, the Holder,
         at no additional cost, shall be entitled to receive, upon exercise of
         this Warrant, such other assets and property, including cash, to which
         the Holder would have been entitled if at the time of such merger,
         consolidation or other transaction the Holder had been the holder of
         the number of shares of Common Stock equal to the number of shares as
         to which this Warrant shall then be so exercised.  Comparable rights
         shall accrue in the event of successive mergers or consolidations of
         the character described above.

                 For purposes of this Section 9.1, "Current Market Price per
         share of Common Stock" shall mean the closing price of a share of
         Common Stock on the principal national securities exchange on which
         the Common Stock is listed or, if the Common Stock is not so listed,
         the average bid and asked price of a share of Common Stock as reported
         in the NASDAQ System, in each case on the trading day immediately
         preceding the first trading day on which, as a result of the
         establishment of a record date or otherwise, the trading price
         reflects that an acquiror of Common Stock in the public market will
         not participate in or receive the payment of any applicable dividend
         or distribution.

                 Except as hereinbefore expressly provided, (i) the issue by
         the Company of shares of Common Stock of any class, or securities
         convertible into shares of stock of any class, for cash or property,
         or for labor or services either upon direct sale or upon the exercise
         of rights or warrants to subscribe therefor, or upon conversion of
         shares or obligations of the Company convertible into such shares or
         other securities, shall not affect, and no adjustment by reason
         thereof shall be made with respect to, the number or price of shares
         of Common Stock then subject to this Warrant and (ii) no adjustment in
         respect of any dividends shall be made during the term of this Warrant
         or upon the exercise of this Warrant.

                 9.2      Voluntary Adjustment by the Company.  The Company may
         at its option, at any time during the term of this Warrant, reduce the
         then current Warrant Price to any amount deemed appropriate by the
         Board of Directors of the Company.

                 9.3      Statement on Warrant.  Irrespective of any
         adjustments in the Warrant Price with respect to this Warrant or the
         number or kind of shares purchasable upon the exercise of this
         Warrant, warrants theretofore or thereafter issued may continue to
         express the same price and number and kind of shares as are stated in
         this Warrant.





                                      -5-
<PAGE>   6


         10.     REGISTRATION RIGHTS.

                 10.1     Demand Rights.  On one occasion after January 1,
         1997, the Holder may request, pursuant to this Section 10.1, that the
         Company register under the Securities Act the Warrant Shares (as
         adjusted under Section 9) issued to the Holder upon exercise of this
         Warrant pursuant to a non-underwritten offering having a period of
         distribution not to exceed 120 days; provided, however, the Company
         shall not be obligated to prepare and file any registration statement
         pursuant to this Section 10.1, or prepare or file any amendment or
         supplement thereto, at any time when the Company, in the good faith
         judgment of its Board of Directors, expressed by resolution specifying
         the reason therefor, reasonably believes that the filing thereof at
         the time requested, or the offering of securities pursuant thereto,
         would materially and adversely affect a pending or proposed public
         offering of securities of the Company, an acquisition, merger,
         recapitalization, consolidation, reorganization or similar transaction
         relating to the Company or negotiations, discussions or pending
         proposals with respect thereto or require premature disclosure of
         information not otherwise required to be disclosed to the potential
         detriment of the Company.  Notwithstanding anything to the contrary
         contained in this Section 10.1, the Company shall be permitted, on
         three business days prior written notice to the Holder, to suspend the
         period of sale or distribution of shares of Common Stock subject to a
         registration pursuant to this Section 10.1 at any time when the
         Company, in the good faith judgment of its Board of Directors,
         expressed by resolution specifying the reason therefor, reasonably
         believes that the sale or distribution thereof at the time requested
         would materially and adversely affect a pending or proposed public
         offering of securities of the Company, an acquisition, merger,
         recapitalization, consolidation, reorganization or similar transaction
         relating to the Company or negotiations, discussions or pending
         proposals with respect thereto or require premature disclosure of
         information not otherwise required to be disclosed to the potential
         detriment of the Company; provided, however, that such period of sale
         or distribution shall resume after any such suspension for a number of
         days necessary to keep such registration effective for permitted sales
         thereunder for a term of 120 days.  The filing of a registration
         statement, or any amendment or supplement thereto, by the Company may
         not be deferred, and the sale and distribution of shares may not be
         suspended, in each case pursuant to the foregoing provisions, for more
         than 60 days after the abandonment or consummation (or the completion
         of the distribution of securities in the case of a public offering) of
         any of the proposals or transactions described therein or, in any
         event, for more than 120 days.

                 10.2     Piggyback Rights.  If, at any time after the date
         hereof, the Company proposes to register under the Securities Act any
         shares of Common Stock for sale by it pursuant to an underwritten
         public offering of the Common Stock (except with respect to
         registration statements filed on Form S-4 or such other forms as shall
         be prescribed under the Securities Act for the same purposes as such
         form), it will at each such time, prior to the filing of any such
         registration statement, give written notice to the Holder of its
         intention so to do, regardless of whether the Holder has previously
         exercised piggyback registration rights or demand rights as to any
         other shares of stock hold by it, and, upon the written request (which
         must specify the number of shares of Common Stock to participate in
         such underwritten offering) of the Holder delivered to the Company
         within five days of receipt of the Company's notice, the Company will
         use its best efforts to cause any Warrant Shares as to which
         registration shall have been so requested to be included in the shares
         to be covered by the registration statement proposed to be filed by
         the Company.  Nothing contained in this Section 10.2 shall, however,
         limit the Company's right to cancel, postpone or withdraw any such
         proposed registration for any reason.  Any request by the Holder
         pursuant to this Section 10.2 to register Warrant Shares for sale in
         the underwriting shall be on the same terms and conditions as the
         shares of Common Stock to be registered and sold through underwriters
         under such





                                      -6-
<PAGE>   7


         registration; provided, however, that as a condition to such inclusion
         the Holder shall execute an underwriting agreement acceptable to the
         underwriters and, if requested, a custody agreement having such
         customary terms as the underwriters shall request, including
         indemnification, and if the managing underwriter determines and
         advises in writing that the inclusion in the underwriting of all
         Warrant Shares proposed to be included by the Holder and any other
         shares of Common Stock sought to be registered by any other
         stockholder of the Company exercising rights comparable to those of
         the Holder under this Warrant (the "Other Common Stock") would, in its
         reasonable and good faith judgment, interfere with the successful
         marketing of the securities proposed to be registered for underwriting
         by the Company or by any holder of Common Stock having the right to
         require the Company to file a registration statement to register such
         Common Stock, then the number of Warrant Shares and Other Common Stock
         requested to be included in the underwriting shall be reduced pro rata
         among the Holder and the holders of Other Common Stock requesting such
         registration and inclusion in the underwriting and may, in the
         determination of such managing underwriter and consistent with pro
         rata reduction, be reduced to zero.

                 10.3     Procedure.  If and whenever the Company is required
         by the provisions of this Warrant to use its best efforts to effect
         the registration of any Warrant Shares under the Securities Act, the
         Company will, subject to the other provisions of this Section 10:

                          (a)     as expeditiously as reasonably practicable,
                 prepare and file with the Securities and Exchange Commission
                 (the "Commission") a registration statement on the appropriate
                 form with respect to such Warrant Shares and seek to cause
                 such registration statement to become and remain effective;

                          (b)     as expeditiously as reasonably practicable,
                 prepare and file with the Commission such amendments and
                 supplements to such registration statement and the prospectus
                 used in connection therewith as may be necessary to keep such
                 registration statement effective and to comply with the
                 provisions of the Securities Act with respect to the
                 disposition of such Warrant Shares covered by such
                 registration statement in accordance with the intended method
                 of distribution set forth in such registration statement;

                          (c)     as expeditiously as reasonably practicable,
                 furnish to the Holder such number of copies of prospectuses
                 and preliminary prospectuses in conformity with the
                 requirements of the Securities Act, and such other documents
                 as the Holder may reasonably request, in order to facilitate
                 the public sale or other disposition of such Warrant Shares;
                 provided, however, that the obligation of the Company to
                 deliver copies of prospectuses or preliminary prospectuses to
                 the Holder shall be subject to the receipt by the Company of
                 reasonable assurances from the Holder that it will comply with
                 the applicable provisions of the Securities Act and of such
                 other securities laws as may be applicable in connection with
                 any use by it of any prospectuses or preliminary prospectuses;

                          (d)     as expeditiously as reasonably practicable,
                 furnish, at the request of the Holder, on the date that
                 Warrant Shares are to be delivered to the underwriters for
                 sale pursuant to such registration or, if such Warrant Shares
                 are not being sold through underwriters, on the date the
                 registration statement with respect to such Warrant Shares
                 becomes effective (i) an opinion, dated such date, of the
                 independent counsel representing the Company for the purposes
                 of such registration, addressed to the underwriters, if any,
                 and to the Holder, stating that such registration statement
                 has become effective under the Securities Act and that (A) to
                 the knowledge of such





                                      -7-
<PAGE>   8


                 counsel, no stop order suspending the effectiveness of such
                 registration statement has been instituted or is pending or
                 contemplated under the Securities Act; (B) the registration
                 statement, the related prospectus, and each amendment or
                 supplement thereto, including all documents incorporated by
                 reference therein, comply as to form in all material respects
                 with the requirements of the Securities Act and the applicable
                 rules and regulations of the Commission thereunder (except
                 that such counsel need express no opinion as to financial
                 statements or other financial or statistical or reserve data
                 contained or incorporated by reference therein); and (C) no
                 facts have come to the attention of such counsel that caused
                 such counsel to believe (with customary qualifications) that
                 either the registration statement or the final prospectus, or
                 any amendment or supplement thereto, including all documents
                 incorporated by reference therein, in light of the
                 circumstances under which they were made, contains any 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 (except that such counsel
                 need express no belief as to financial statements or other
                 financial or statistical or reserve data contained or
                 incorporated by reference therein or as to any information
                 provided by the stockholders of the Company or any underwriter
                 for inclusion therein); and (ii) a letter, dated such date,
                 from the independent certified public accountants of the
                 Company, addressed to the underwriters, stating that they are
                 independent certified public accountants within the meaning of
                 the Securities Act and that in the opinion of such
                 accountants, the financial statements and other financial data
                 of the Company included in the registration statement or the
                 prospectus, or any amendment or supplement thereto, including
                 all documents incorporated by reference therein, comply as to
                 form in all material respects with the applicable accounting
                 requirements of the Securities Act.  Such letter from the
                 independent certified public accountants shall additionally
                 cover such other customary financial matters (including
                 information as to the period ending not more than five
                 business days prior to the date of such letter) with respect
                 to the registration in respect of which such letter is being
                 given as such underwriters, if any, or the stockholders of the
                 Company making such request may reasonably request;

                          (e)     as expeditiously as practicable, use its best
                 efforts to register or qualify Warrant Shares covered by such
                 registration statement under such other securities laws of
                 such United States jurisdictions as the Holder shall
                 reasonably request (considering the nature and size of the
                 offering) and do any and all other acts and things which may
                 be necessary or desirable to enable the Holder to consummate
                 the public sale or other disposition in such jurisdictions of
                 Warrant Shares; provided, however, that the Company shall not
                 be required to qualify to transact business as a foreign
                 corporation in any jurisdiction in which it would otherwise
                 not be required to be so qualified or to take any action which
                 would subject it to general service of process in any
                 jurisdiction in which it is not then so subject;

                          (f)     bear all Registration Expenses (as defined
                 below) in connection with all registrations hereunder;
                 provided, however, that all Selling Expenses (as defined
                 below) of Warrant Shares and all fees and disbursements of
                 counsel for the Holder in connection with each registration
                 pursuant to this Warrant shall be borne by the Holder.
                 Expenses incurred by the Company in complying with this
                 Warrant, including, without limitation:  (i) all registration
                 and filing fees; (ii) all printing expenses; (iii) all fees
                 and disbursements of counsel for the Company; (iv) all blue
                 sky fees and expenses; and (v) all fees and expenses of
                 accountants for the Company are herein referred to as
                 "Registration Expenses".  All underwriting fees and discounts
                 and brokerage and selling commissions relating to Warrant
                 Shares to be registered for sale by the





                                      -8-
<PAGE>   9


                 Holder and fees and expenses of the counsel for the Holder and
                 any underwriter's counsel applicable to the sales by the
                 Holder in connection with any such registration are herein
                 referred to as "Selling Expenses"; and

                          (g)     keep each registration pursuant to Section
                 10.1 hereof effective for a period of up to 120 days or such
                 shorter period of time until the transfer or sale of all
                 Warrant Shares so registered has been completed.

                 10.4     Indemnification.

                          (a)     In the event of a registration of any Warrant
                 Shares under the Securities Act pursuant to this Warrant, the
                 Company will indemnify and hold harmless the Holder and any
                 other Person, if any, who controls the Holder within the
                 meaning of Section 15 of the Securities Act, against any
                 losses, claims, damages or liabilities, joint or several, to
                 which such selling stockholder of the Company or such
                 controlling Person may become subject under the Securities Act
                 or otherwise, insofar as such losses, claims, damages or
                 liabilities or actions in respect thereof arise out of or are
                 based upon any untrue statement or alleged untrue statement of
                 any material fact contained, on the effective date thereof, in
                 any registration statement under which such Warrant Shares
                 were registered under the Securities Act, any preliminary
                 prospectus distributed with the consent of the Company or
                 final prospectus contained therein, or any amendment thereof
                 or supplement thereto, including all documents incorporated by
                 reference therein, or arise out of or are based upon 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, and will reimburse the
                 Holder and each such controlling Person for any legal or any
                 other expenses reasonably incurred by them in connection with
                 investigating or defending any such loss, claim, damage,
                 liability or action; provided, however, that the Company will
                 not be liable in any such case to the extent that any such
                 loss, claim, damage or liability arises out of or is based
                 upon an untrue statement or alleged untrue statement or
                 omission or alleged omission made in such registration
                 statement, such preliminary prospectus, such final prospectus
                 or such amendment or supplement, including all documents
                 incorporated by reference therein, in reliance upon and in
                 conformity with written information furnished to the Company
                 by or on behalf of the Holder or a controlling Person of the
                 Holder specifically for use in the preparation thereof.

                          (b)     In the event of any registration of any
                 Warrant Shares under the Securities Act pursuant to this
                 Warrant, Holder indemnify and hold harmless the Company and
                 each Person, if any, who controls the Company within the
                 meaning of Section 15 of the Securities Act, each officer of
                 the Company who signs the registration statement, each
                 director of the Company and each underwriter (if any) and each
                 Person who controls any underwriter (if any) within the
                 meaning of Section 15 of the Securities Act, against any and
                 all such losses, claims, damages, liabilities or actions which
                 the Company or such officer, director, underwriter (if any) or
                 controlling Person may become subject under the Securities Act
                 or otherwise, and will reimburse the Company, each such
                 officer, director, underwriter (if any) and controlling Person
                 for any legal or any other expenses reasonably incurred by
                 such party in connection with investigating or defending any
                 such loss, claim, damage, liability or action, if (a) such
                 loss, claim, damage, liability or action in respect thereof
                 arises out of or is based upon any untrue statement or alleged
                 untrue statement of any material fact contained in any such
                 registration statement or any such prospectus, or any
                 amendment thereof or supplement thereto, or arises out of or
                 is based upon





                                      -9-
<PAGE>   10


                 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 and (b) any such statement
                 or omission of a material fact was made in reliance upon and
                 in conformity with written information furnished to the
                 Company by or on behalf of the Holder specifically for use in
                 connection with the preparation of such registration statement
                 or prospectus.  In connection with any transaction
                 contemplated by Section 10.2 hereof, the Holder also agrees to
                 indemnify each such underwriter and each Person who controls
                 any such underwriter within the meaning of Section 15 of the
                 Securities Act as may reasonably and customarily be requested
                 by the underwriters in connection with any underwritten
                 offering of such Warrant Shares.

                          (c)     Promptly after receipt by any indemnified
                 Person of notice of any claim or commencement of any action in
                 respect of which indemnity is to be sought against an
                 indemnifying Person pursuant to this Warrant, such indemnified
                 Person shall notify the indemnifying Person in writing of such
                 claim or of the commencement of such action, and, subject to
                 provisions hereinafter stated, in case any such action shall
                 be brought against an indemnified Person and such indemnifying
                 Person shall have been notified of the same, such indemnifying
                 Person shall be entitled to participate therein, and, to the
                 extent it shall wish, to assume the defense thereof, with
                 counsel reasonably satisfactory to such indemnified Person,
                 and after notice from the indemnifying Person to such
                 indemnified Person of its election to assume the defense
                 thereof, such indemnifying Person shall not be liable to such
                 indemnified Person in connection with the defense thereof;
                 provided, however, if there exists or will exist a conflict of
                 interest which would make it inappropriate in the reasonable
                 judgment of the indemnified Person for the same counsel to
                 represent both the indemnified Person and such indemnifying
                 Person then such indemnified Person shall be entitled to
                 retain its own counsel at the expense of such indemnifying
                 Person; provided further, however, the indemnifying Person
                 shall not be required to pay for more than one separate
                 counsel for all of the indemnified Persons in addition to any
                 local counsel.

                 10.5     Termination.  If Rule 144 or Rule 145 as promulgated
         under the Securities Act or any successor or similar rule or statute
         shall permit the sale of Warrant Shares in compliance with the
         conditions thereof and the provisions thereof, the rights of the
         Holder as to registration provided for in this Warrant as to such
         Warrant Shares shall terminate immediately.

         11.     FRACTIONAL INTERESTS.

                 The Company shall not be required to issue fractional Warrant
Shares on the exercise of this Warrant and the number of Warrant Shares
issuable upon such exercise shall be rounded down to the nearest whole share.

         12.     NO RIGHTS AS STOCKHOLDERS; NOTICES TO HOLDER.

                 Nothing contained in this Warrant shall be construed as
conferring upon the Holder the right to vote or to receive dividends or to
consent to or receive notice as a stockholder in respect of any meeting of
stockholders for the election of directors of the Company or any other matter,
or any rights whatsoever as a stockholder of the Company.  If, however, at any
time during the Exercise Period:





                                      -10-
<PAGE>   11


                          (a)     the Company shall declare any dividend
                 payable in any securities upon its shares of Common Stock or
                 make any distribution (other than a cash dividend or a
                 dividend payable in additional shares of Common Stock) to the
                 holders of its shares of Common Stock;

                          (b)     the Company shall offer to the holders of its
                 shares of Common Stock any additional shares of Common Stock
                 or securities convertible into shares of Common Stock or any
                 right to subscribe to shares of Common Stock or securities
                 convertible or exchangeable into shares of Common Stock; or

                          (c)     a dissolution, liquidation or winding up of
                 the Company (other than in connection with a consolidation,
                 merger or sale of all or substantially all of its property,
                 assets and business as an entirety) shall be proposed;

then in any one or more of such events, the Company shall give notice in
writing of such event to the Holder as provided in Section 13 hereof at least
10 days prior to the date fixed as a record date or the date of closing the
transfer books for the determination of the stockholders entitled to such
dividend, distribution or subscription rights, or for the determination of
stockholders entitled to vote on such proposed dissolution, liquidation or
winding up.  Such notice shall specify such record date or date of the closing
of the transfer books, as the case may be.  Failure to mail such notice or any
defect therein or in the mailing thereof shall not affect the validity of any
action taken in connection with such dividend, distribution or subscription
rights, or proposed dissolution, liquidation or winding up.

         13.     NOTICES.

         All notices, requests, consents and other communications hereunder
shall be in writing and shall be deemed to have been made when delivered or
mailed first class, postage prepaid:

                          (i) if to the Holder at:

                                  Trust Company of Oklahoma
                                  P.O. Box 3627
                                  Tulsa, Oklahoma  74101-3627
                                  Attn:  President

                          (ii) if to the Company at:

                                  UTI Energy Corp.
                                  Attn: President
                                  485 Devon Park Drive, #112
                                  Wayne, Pennsylvania 19087


or to such other address or addresses as the Holder or the Company may
designate from time to time for itself by a notice pursuant hereto.





                                      -11-
<PAGE>   12


         14.     SUCCESSORS.

                 No party hereto may assign its rights or obligations hereunder
without the prior written consent of the other party.  All the covenants and
provisions of this Warrant by or for the benefit of the Company or the Holder
shall bind and inure to the benefit of their respective permitted successors
and assigns hereunder.

         15.     APPLICABLE LAW.

                 This Warrant shall be governed by and construed in accordance
with the laws of the State of Delaware.

         16.     BENEFITS OF WARRANT.

                 Nothing in this Warrant shall give or be construed to give any
person or corporation other than the Company and the Holder any legal or
equitable right, remedy or claim under this Warrant.  This Warrant shall be for
the sole and exclusive benefit of the Company and the Holder.

         17.     CAPTIONS.

                 The captions of the sections of this Warrant have been
inserted for convenience only and shall have no substantive effect.

         IN WITNESS WHEREOF, the parties hereto have caused this Warrant to be
duly executed as of the 14th day of August, 1996.

                                        UTI ENERGY CORP.



                                        By:     /s/ VAUGHN E. DRUM
                                           -------------------------------------
                                                    Vaughn E. Drum
                                                      President 

ATTEST:

    /s/ VINCENT J. DONAHUE
- --------------------------------------
            SECRETARY





                                      -12-
<PAGE>   13



                                        THE SAM K. VIERSEN JR. TRUST DATED
                                            SEPTEMBER 9, 1986 AS AMENDED
                                            AND RESTATED ON MAY 11, 1994



                                        By  /s/ PAUL MINDEMAN
                                          --------------------------------------
                                                Paul Mindeman, President of 
                                                The Trust Company of Oklahoma 
                                                Successor Trustee





                                      -13-
<PAGE>   14



                                                                       EXHIBIT A

                               SUBSCRIPTION FORM

                          TO BE EXECUTED BY THE HOLDER
                              TO EXERCISE WARRANT

                             UTI ENERGY CORPORATION

         The undersigned hereby exercises the right to purchase _____________
shares of common stock covered by this Warrant according to the conditions
thereof and herewith makes payment of the Warrant Price of such shares in full.

                                        [INDIVIDUAL]


                                        Signature
                                                 -------------------------------
                                             Name:
                                                  ------------------------------


                                        Address
                                                 -------------------------------

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

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

Dated: 
       ----------------,--------.


                                        [CORPORATION OR PARTNERSHIP]

                                        
                                        ----------------------------------------
                                                  (Name of Entity)


                                        By:
                                           -------------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                        Address
                                                 -------------------------------

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

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

Dated: 
       ----------------,--------.






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