FIRST RESERVE CORP /CT/ /ADV
SC 13D/A, 1997-04-21
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<PAGE>   1
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                  SCHEDULE 13D
 
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*
 
                           HUGOTON ENERGY CORPORATION
- --------------------------------------------------------------------------------
                                (NAME OF ISSUER)
 
                         COMMON STOCK WITHOUT PAR VALUE
- --------------------------------------------------------------------------------
                         (TITLE OF CLASS OF SECURITIES)
 
                                    444-613
    ------------------------------------------------------------------------
                                 (CUSIP NUMBER)
 
                              MS. ELIZABETH FOLEY
                           FIRST RESERVE CORPORATION
            475 STEAMBOAT ROAD, GREENWICH, CT 06830  (203) 625-2506
- --------------------------------------------------------------------------------
(NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED TO RECEIVE NOTICES AND
                                COMMUNICATIONS)
 
                                 APRIL 17, 1997
    ------------------------------------------------------------------------
            (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)
 
IF THE FILING PERSON HAS PREVIOUSLY FILED A STATEMENT ON SCHEDULE 13G TO REPORT
THE ACQUISITION WHICH IS SUBJECT OF THIS SCHEDULE 13D, AND IS FILING THIS
SCHEDULE BECAUSE OF RULE 13D-1(B)(3) OR (4), CHECK THE FOLLOWING BOX [ ].
 
CHECK THE FOLLOWING BOX IF A FEE IS BEING PAID WITH THIS STATEMENT [ ] (A FEE IS
NOT REQUIRED ONLY IF THE REPORTING PERSON: (1) HAS A PREVIOUS STATEMENT ON FILE
REPORTING BENEFICIAL OWNERSHIP OF MORE THAN FIVE PERCENT OF THE CLASS OF
SECURITIES DESCRIBED IN ITEM 1; AND (2) HAS FILED NO AMENDMENT SUBSEQUENT
THERETO REPORTING BENEFICIAL OWNERSHIP OF FIVE PERCENT OR LESS OF SUCH CLASS.)
(SEE RULE 13D-7.)
 
NOTE:  SIX COPIES OF THIS STATEMENT, INCLUDING ALL EXHIBITS, SHOULD BE FILED
WITH THE COMMISSION. SEE RULE 13D-1(A) FOR OTHER PARTIES TO WHOM COPIES ARE TO
BE SENT.
 
* THE REMAINDER OF THIS COVER PAGE SHALL BE FILLED OUT FOR A REPORTING PERSON'S
INITIAL FILING ON THIS FORM WITH RESPECT TO THE SUBJECT CLASS OF SECURITIES, AND
FOR ANY SUBSEQUENT AMENDMENT CONTAINING INFORMATION WHICH WOULD ALTER
DISCLOSURES PROVIDED IN A PRIOR COVER PAGE.
 
THIS INFORMATION REQUIRED ON THE REMAINDER OF THIS COVER PAGE SHALL NOT BE
DEEMED TO BE "FILED" FOR THE PURPOSE OF SECTION 18 OF THE SECURITIES EXCHANGE
ACT OF 1934 ("ACT") OR OTHERWISE SUBJECT TO THE LIABILITIES OF THAT SECTION OF
THE ACT BUT SHALL BE SUBJECT TO ALL OTHER PROVISIONS OF THE ACT (HOWEVER, SEE
THE NOTES).
 
                               Page 1 of 34 pages
<PAGE>   2
 
                                  SCHEDULE 13D
 
<TABLE>
 <S>                                                                    <C>
  CUSIP NO. 444-613                                                     PAGE    2   OF    34   PAGES
- -----------------------------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
               First Reserve Corporation
               I.R.S. No.: 06-1210123
- -------------------------------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                     (a) [ ]
                                                                                               (b) [X]
- -------------------------------------------------------------------------------------------------------
    3    SEC USE ONLY
- -------------------------------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
               OO
- -------------------------------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)    [ ]
- -------------------------------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
- -------------------------------------------------------------------------------------------------------
     NUMBER OF         7    SOLE VOTING POWER
      SHARES                      0
   BENEFICIALLY    -------------------------------------------------------------------------------------
     OWNED BY          8    SHARED VOTING POWER
       EACH                      4,268,441
    REPORTING      -------------------------------------------------------------------------------------
      PERSON           9    SOLE DISPOSITIVE POWER
       WITH                       0
                   -------------------------------------------------------------------------------------
                      10    SHARED DISPOSITIVE POWER
                                  4,268,441
- -------------------------------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
               4,268,441
- -------------------------------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*          [ ]

- -------------------------------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               21.6
- -------------------------------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
               CO
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION
<PAGE>   3
 
                                  SCHEDULE 13D
 
<TABLE>
 <S>                                                                     <C>
  CUSIP NO. 444-613                                                      PAGE    3   OF    34   PAGES
- -----------------------------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
               First Reserve Secured Energy Assets Fund, Limited Partnership
               I.R.S. Identification No. 06-1232433
- -------------------------------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                     (a) [ ]
                                                                                               (b) [X]
- -------------------------------------------------------------------------------------------------------
    3    SEC USE ONLY
- -------------------------------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
               OO
- -------------------------------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)    [ ]
- -------------------------------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
- -------------------------------------------------------------------------------------------------------
     NUMBER OF         7    SOLE VOTING POWER
      SHARES                      0
   BENEFICIALLY    -------------------------------------------------------------------------------------
     OWNED BY          8    SHARED VOTING POWER
       EACH                       1,727,896
    REPORTING      -------------------------------------------------------------------------------------
      PERSON           9    SOLE DISPOSITIVE POWER
       WITH                       0
                   ------------------------------------------------------------------------------------
                      10    SHARED DISPOSITIVE POWER
                                  1,727,896
- -------------------------------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
               1,727,896
- -------------------------------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*          [ ]

- -------------------------------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               8.7
- -------------------------------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
               PN
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION
<PAGE>   4
 
                                  SCHEDULE 13D
 
<TABLE>
 <S>                                                                      <C>
  CUSIP NO. 444-613                                                       PAGE    4   OF    34   PAGES
- ------------------------------------------------------------------------------------------------------
    1    NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
               First Reserve Fund V, Limited Partnership
               I.R.S. Identification No.: 06-1295657
- -------------------------------------------------------------------------------------------------------
    2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                     (a) [ ]
                                                                                               (b) [X]
- -------------------------------------------------------------------------------------------------------
    3    SEC USE ONLY
- -------------------------------------------------------------------------------------------------------
    4    SOURCE OF FUNDS*
               OO
- -------------------------------------------------------------------------------------------------------
    5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)    [ ]
- -------------------------------------------------------------------------------------------------------
    6    CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
- -------------------------------------------------------------------------------------------------------
     NUMBER OF         7    SOLE VOTING POWER
      SHARES                      0
   BENEFICIALLY    -------------------------------------------------------------------------------------
     OWNED BY          8    SHARED VOTING POWER
       EACH                       2,138,802
    REPORTING      -------------------------------------------------------------------------------------
      PERSON           9    SOLE DISPOSITIVE POWER
       WITH                       0       
                    -----------------------------------------------------------------------------------              
                      10    SHARED DISPOSITIVE POWER
                                  2,138,802
- -------------------------------------------------------------------------------------------------------
   11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
               2,138,802
- -------------------------------------------------------------------------------------------------------
   12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*          [ ]

- -------------------------------------------------------------------------------------------------------
   13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
               10.8
- -------------------------------------------------------------------------------------------------------
   14    TYPE OF REPORTING PERSON*
               PN
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION
<PAGE>   5
 
ITEM 1.  SECURITY AND ISSUER
 
     This Amendment No. 3 to Schedule 13D (this "Amendment No. 3") relates to
shares of the common stock, no par value (the "Common Stock"), of Hugoton Energy
Corporation, a Kansas corporation (the "Company"). This amendment No. 3 amends
the Statement on Schedule 13D dated September 7, 1995 (the "1995 Filing") filed
by First Reserve Corporation ("First Reserve"), First Reserve Secured Energy
Assets Fund, Limited Partnership ("FRSEA") and First Reserve Fund V, Limited
Partnership ("Fund V"), as amended by Amendment No. 1, dated January 28, 1997
and Amendment No. 2, dated February 26, 1997. Except as otherwise specified
herein, capitalized terms used herein but not defined herein shall have the
meanings ascribed to them in the 1995 Filing.
 
ITEM 2.  IDENTITY AND BACKGROUND
 
     Item 2 is hereby amended by adding the following paragraph:
 
          Jonathan S. Linker is a Managing Director of First Reserve. Mr.
     Linker's business address is First Reserve Corporation, 6000 Texas Commerce
     Tower, Houston, Texas 77002. Mr. Linker's principal occupation is as
     Managing Director of First Reserve. In the last five years, Mr. Linker (i)
     has not been convicted in a criminal proceeding (excluding traffic
     violations, or similar misdemeanors) and (ii) has not been a party to a
     civil proceeding of a judicial or administrative body of competent
     jurisdiction resulting in (x) Mr. Linker becoming subject to a judgment,
     decree or final order enjoining future violations of, or prohibiting or
     mandating activities subject to federal or state securities laws or (y) a
     finding of any violation with respect to such laws.
 
ITEM 4.  PURPOSE OF TRANSACTION
 
     Item 4 is hereby amended by adding the following paragraph:
 
          As described in Item 6 below, on April 14, 1997, the Company, Odyssey
     Partners, L.P. ("Odyssey Partners"), FRSEA, American Gas & Oil Investors,
     Limited Partnership ("AmGO") and AmGO II, Limited Partnership ("AmGO II")
     entered into a purchase agreement (the "Purchase Agreement") with Salomon
     Brothers Inc and Jefferies & Company, Inc. (the "Purchasers") providing
     for, among other things, the sale to the Purchasers by FRSEA, AmGO and AmGO
     II of 106,060 shares of Common Stock, 196,970 shares of Common Stock and
     196,970 shares of Common Stock, respectively, at a purchase price of $9.125
     per share. The sale of such shares of Common Stock pursuant to the Purchase
     Agreement was effected on April 17, 1997. First Reserve is the managing
     general partner of each of FRSEA, AmGO and AmGO II. A copy of the Purchase
     Agreement is attached hereto as Exhibit I.
 
          None of FRSEA, Fund V or First Reserve (the "Reporting Parties") has
     any current intention of selling any shares of Common Stock pursuant to the
     Registration Statement referenced in Amendment No. 2 to this Statement on
     Schedule 13D.
 
                               Page 5 of 34 pages
<PAGE>   6
 
ITEM 5.  INTEREST IN SECURITIES OF ISSUER
 
     Item 5(a) is hereby amended by adding the following paragraphs:
 
          As of the date of this Amendment No. 3, the Reporting Parties are the
     beneficial owners of the Company Common Stock in the numbers and
     percentages set forth in the table below. In addition, Jonathan S. Linker,
     a Managing Director of First Reserve, beneficially owns 23,500 shares of
     Common Stock in his individual capacity.
 
<TABLE>
<CAPTION>
                                                         NUMBERS OF SHARES     % OF CLASS OF
                         REPORTING PARTY                 BENEFICIALLY OWNED    SECURITY OWNED
          ---------------------------------------------  ------------------    --------------
          <S>                                            <C>                   <C>
          FRSEA........................................      1,727,896              8.7%
          Fund V.......................................      2,138,802             10.8%
          First Reserve (1)............................      4,268,441             21.6%
</TABLE>
 
- ---------------
(1) Includes shares beneficially owned by FRSEA and Fund V.
 
     The shares listed as beneficially owned by First Reserve are owned of
record and beneficially by FRSEA, Fund V, AmGO and AmGO II. First Reserve is the
managing general partner of each of FRSEA, Fund V, AmGO and AmGO II. Through
their ownership of shares of First Reserve, William E. Macaulay and John A. Hill
may be deemed to share beneficial ownership of the shares of Common Stock shown
as owned by First Reserve. Messrs. Macaulay and Hill disclaim beneficial
ownership of such shares.
 
     Item 5(b) is hereby amended by adding the following paragraphs:
 
         FRSEA and Fund V both share the power to vote or to direct the vote and
     the power to dispose or direct the disposition of all Shares held by them
     with their managing general partner First Reserve. The Reporting Parties
     have the following powers with respect to the Company Common Stock they
     beneficially own:
 
<TABLE>
<CAPTION>
                                             SOLE      SHARED           SOLE          SHARED
                                             VOTING    VOTING        DISPOSITIVE    DISPOSITIVE
                   REPORTING PARTY           POWER      POWER           POWER          POWER
          ---------------------------------  -----    ---------      -----------    -----------
          <S>                                <C>      <C>            <C>            <C>
          FRSEA............................    0      1,727,896        0              1,727,896
          Fund V...........................    0      2,138,802        0              2,138,802
          First Reserve Corporation........    0      4,268,441(1)     0              4,268,441
</TABLE>
 
- ---------------
(1) Includes ownership of FRSEA and Fund V.
 
     Mr. Linker has sole power to vote or to direct the vote and sole power to
dispose or direct the disposition of the 23,500 shares beneficially owned by Mr.
Linker.
 
                               Page 6 of 34 pages
<PAGE>   7
 
     Item 5(c) is hereby amended by adding the following paragraphs:
 
          As described in Item 6 below, on April 17, 1996, FRSEA sold 106,060
     shares of Common Stock and two other limited partnerships for which First
     Reserve is the managing general partner sold an aggregate of 393,940 shares
     of Common Stock. Such sales of Common Stock were effected pursuant to the
     Purchase Agreement at a price of $9.125 per share of Common Stock.
 
          Except as disclosed above, within the knowledge of the Reporting
     Parties, no transactions in shares of Common Stock were effected during the
     past 60 days by such persons or the executive officers, directors and
     controlling persons (if any) of such persons.
 
ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS
 
     Item 6 is hereby amended by adding the following paragraphs:
 
          On April 14, 1997, the Company, Odyssey Partners, L.P., FRSEA, and
     AmGO and AmGO II entered into the Purchase Agreement with the Purchasers
     providing for, among other things, the sale to the Purchasers by FRSEA,
     AmGO and AmGO II of 106,060 shares of Common Stock, 196,970 shares of 
     Common Stock and 196,970 shares of Common Stock, respectively, at a 
     purchase price of $9.125 per share. The sale of such shares of Common 
     Stock pursuant to the Purchase Agreement was effected on April 17, 1997. 
     A copy of the Purchase Agreement is attached hereto as Exhibit I.
 
ITEM 7.  EXHIBITS
 
          Exhibit A         -- Agreement Concerning Filing of Schedule 13D
          Exhibit I         -- Purchase Agreement
 
                               Page 7 of 34 pages
<PAGE>   8
 
     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Amendment No. 3 to the statement
of Schedule 13D is true, complete and correct.
 
Dated April 18, 1997
 
                                          First Reserve Secured Energy Assets
                                          Fund, Limited Partnership, a Delaware
                                          limited partnership
 
                                          By:  First Reserve Corporation, a
                                               Delaware corporation, as 
                                               managing general partner
 
                                          /s/ David H. Kennedy
 
                                          --------------------------------------
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                               Page 8 of 34 pages
<PAGE>   9
 
     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Amendment No. 3 to the statement
of Schedule 13D is true, complete and correct.
 
Dated April 18, 1997
 
                                          First Reserve Fund V, Limited
                                          Parternership, a Delaware limited 
                                          partnership
 
                                          By:  First Reserve Corporation, as
                                               managing general partner
 
                                          /s/ David H. Kennedy
 
                                          --------------------------------------
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                               Page 9 of 34 pages
<PAGE>   10
 
     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Amendment No. 3 to the statement
of Schedule 13D is true, complete and correct.
 
Dated April 18, 1997
 
                                          First Reserve Corporation
 
                                          /s/ David H. Kennedy
                                          --------------------------------------
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                               Page 10 of 34 pages
<PAGE>   11
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
   Exhibit                        Name                                Page    
- -------------                     ----                                ----
<S>             <C>                                                    
       A        -- Agreement Concerning Filing of
                   Schedule 13D                                        12
       I        -- Purchase Agreement                                  13
</TABLE>
 
                               Page 11 of 34 pages

<PAGE>   1
 
                                   EXHIBIT A
                  AGREEMENT CONCERNING FILING OF SCHEDULE 13D
 
     First Reserve Secured Energy Assets Fund, Limited Partnership, a Delaware
limited partnership ("FRSEA"), First Reserve Fund V, Limited Partnership, a
Delaware limited partnership ("Fund V"), and First Reserve Corporation, a
Delaware Corporation ("First Reserve"), pursuant to Rule 13d-1(f) promulgated
under the Securities Exchange Act of 1934, as amended, hereby agree to the joint
filing with the other Reporting Parties on behalf of each of them of a statement
on Schedule 13D with respect to the Common Stock, without par value, of Hugoton
Energy Corporation and that this agreement be included as an exhibit to such
joint filing.
 
     FRSEA, Fund V and First Reserve separately acknowledge that they are each
responsible for the timely filing of such statement and any amendments thereto,
and for the completeness and accuracy of the information concerned them
contained therein. No party to this Agreement is responsible for the
completeness or accuracy of the information concerning the other parties, unless
such party knows or has reason to believe that such information is inaccurate.
 
     This agreement may be executed in any number of counterparts all of which
taken together such constitute on and the same instrument.
 
     Dated as of April 18, 1997.
 
                                          First Reserve Secured Energy Assets
                                          Fund Limited Partnership, a Delaware
                                          limited Partnership
 
                                          By:  First Reserve Corporation, a
                                               Delaware corporation, a 
                                               managing general partner
 
                                          /s/ David H. Kennedy
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                                          First Reserve Fund V, Limited
                                          Partnership, a Delaware limited 
                                          partnership
 
                                          By:  First Reserve Corporation, as
                                               managing general partner
 
                                          /s/ David H. Kennedy
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                                          First Reserve Corporation, a Delaware
                                          corporation
 
                                          /s/ David H. Kennedy
                                          Name: David H. Kennedy
                                          Title:  Managing Director and Director
 
                               Page 12 of 34 pages

<PAGE>   1
                                                                       EXHIBIT I

                           Hugoton Energy Corporation

                                  Common Stock
                                 (no par value)

                               Purchase Agreement


                                                                  April 14, 1997

Salomon Brothers Inc and
Jefferies & Company, Inc.
c/o Salomon Brothers Inc
Seven World Trade Center
New York, New York 10048


Dear Sirs:

                  The persons named in Schedule II hereto (the "Selling
Stockholders") severally propose to sell to you (the "Purchasers") the number of
shares of Common Stock, no par value ("Common Stock"), of Hugoton Energy
Corporation, a Kansas corporation (the "Company") indicated on Schedule I (said
shares to be sold by the Selling Stockholders collectively being hereinafter
called the "Securities").

                  1. Representations and Warranties.

                  (a) The Company represents and warrants to, and agrees with,
each Purchaser as set forth below in this Section 1. Certain terms used in this
Section 1 are defined in paragraph (iii) hereof.

                  (i) The Company has filed with the Securities and Exchange
         Commission (the "Commission") the registration statements (file numbers
         33-97366 and 333-22189) on Form S-3, including a related preliminary
         prospectus, for the registration under the Securities Act of 1933 (the
         "Act") of the offering and sale of the Securities. The Company may have
         filed one or more amendments thereto, including the related preliminary
         prospectus, each of which has previously been furnished to you. The
         Company has filed or will file with the Commission either after
         effectiveness of such registration statement, a final prospectus in
         accordance with Rule 424(b)(1) or (4). The Company has included in such
         registration statement, as amended at the Effective Date of each
         registration statement, all information required by the Act and the
         rules thereunder to be included in the Prospectus with respect to the
         Securities and the offering thereof. As filed, such amendment and form
         of final



                             Page 13 of 34 pages
<PAGE>   2
         prospectus, or such final prospectus, shall contain all required
         information, with respect to the Securities and the offering thereof
         and, except to the extent the Purchasers shall agree in writing to a
         modification, shall be in all substantive respects in the form
         furnished to you prior to the Execution Time or, to the extent not
         completed at the Execution Time, shall contain only such specific
         additional information and other changes (beyond that contained in the
         latest Preliminary Prospectus) as the Company has advised you, prior to
         the Execution Time, will be included or made therein.

                  (ii) On the Effective Date, each Registration Statement did or
         will, and when the Prospectus is or was first filed (if required) in
         accordance with Rule 424(b) with respect to each registration statement
         and on the Closing Date, the Prospectus (and any supplements thereto)
         with respect to each registration statement will, comply in all
         material respects with the applicable requirements of the Act and the
         rules thereunder; on the Effective Date, each Registration Statement
         did not or will not contain any untrue statement of a material fact or
         omit to state any material fact required to be stated therein or
         necessary in order to make the statements therein not misleading; and,
         on the Effective Date, each Prospectus, if not filed pursuant to Rule
         424(b), did not or will not, and on the date of any filing pursuant to
         Rule 424(b) and on the Closing Date, each Prospectus ( together with
         any supplement thereto) will not, include any untrue statement of a
         material fact or omit to state a material fact necessary in order to
         make the statements therein, in the light of the circumstances under
         which they were made, not misleading; provided, however, that the
         Company makes no representations or warranties as to the information
         contained in or omitted from either Registration Statement, or the
         Prospectus (or any supplement thereto) in reliance upon and in
         conformity with information furnished in writing to the Company by or
         on behalf of any Selling Stockholder specifically for inclusion in the
         Registration Statement or the Prospectus (or any supplement thereto).

                  (iii) The terms which follow, when used in this Agreement,
         shall have the meanings indicated. The term "the Effective Date" with
         respect to each Registration Statement shall mean each date that the
         Registration Statement and any post-effective amendment or amendments
         thereto became or become effective. "Execution Time" shall mean the
         date and time that this Agreement is executed and delivered by the
         parties hereto. "Preliminary Prospectus" shall mean any preliminary
         prospectus referred to in paragraph (i) above. "Prospectus" with
         respect to each Registration Statement shall mean the prospectus
         (including all documents incorporated by reference therein) relating to
         the Securities that is first filed pursuant to Rule 424(b) or, if no
         filing pursuant to Rule 424(b) is required, shall mean the form of
         final prospectus relating to the Securities included in the
         Registration Statement at the Effective Date. "Registration Statement"
         shall mean with respect to each Registration Statement the registration
         statement referred to in paragraph (i) above (including all documents
         incorporated by reference therein), exhibits and financial statements,
         as amended at the Execution Time (or, if not effective at the Execution
         Time, in the form in which it shall become effective) and, in the event
         any post-effective amendment thereto becomes effective prior to the
         Closing Date (as hereinafter defined), shall also mean such
         registration statement as so amended and Registration Statements shall
         refer to both such Registration Statements. "Rule 424" refers to such
         rule under the Act.


                             Page 14 of 34 pages
<PAGE>   3
                  (iv) The financial statements, including the notes thereto,
         and supporting schedules included in the Registration Statement or
         incorporated by reference therein present fairly the financial position
         of the Company and its consolidated subsidiaries as at the dates
         indicated and the results of their operations for the periods
         specified; except as otherwise stated in the Registration Statement,
         such financial statements have been prepared in conformity with
         generally accepted accounting principles applied on a consistent basis;
         and the supporting schedules included in the Registration Statement or
         incorporated by reference therein present fairly the information
         required to be stated therein.

                  (v) The information on the basis of which the reserve
         estimates and related information included in the Registration
         Statements or incorporated by reference therein were prepared by the
         Company, its subsidiaries, Ryder Scott Company Petroleum Engineers or
         any other person is true and correct in all material respects.

                  (vi) Since the respective dates as of which information is
         given in each Registration Statement and the related Prospectus, except
         as otherwise stated therein, (A) there has been no material adverse
         change in the condition, financial or otherwise, or the earnings,
         business or properties of the Company and its subsidiaries considered
         as one enterprise, whether or not arising in the ordinary course of
         business, (B) there have been no transactions entered into by the
         Company or any of its subsidiaries other than those in the ordinary
         course of business, which are material with respect to the Company and
         its subsidiaries considered as one enterprise, and (C) there has been
         no dividend or distribution of any kind declared, paid or made by the
         Company on any class of its capital stock.

                  (vii) The Company has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of the State
         of Kansas with corporate power and authority to own, lease and operate
         its properties and conduct its business as described in the Prospectus.

                  (viii) The authorized, issued and outstanding capital stock of
         the Company is as set forth in the financial statements incorporated by
         reference in the Registration Statements (except for issuances, if any,
         subsequent to the date of the Prospectus pursuant to employee benefit
         plans); the shares of issued and outstanding Common Stock have been
         duly authorized and validly issued and are fully paid and
         nonassessable; the Securities to be purchased by the Purchasers from
         the Company have been duly authorized for issuance and sale to pursuant
         to this Agreement and, when issued and delivered by the Company
         pursuant to this Agreement against payment therefor, will be validly
         issued and fully paid and non-assessable; the issuance of the
         Securities is not subject to preemptive or other similar rights; and
         the Common Stock conforms to all statements relating thereto contained
         in the Prospectus.

                  (ix) This Agreement has been duly and validly authorized by
         the Company.


                             Page 15 of 34 pages
<PAGE>   4
                  (x) The execution, delivery and performance of this Agreement
         and the consummation of the transactions herein contemplated have been
         duly and validly authorized by all necessary corporate action and will
         not conflict with or constitute a breach or violation of, or default
         under, or result in the creation or imposition of any lien, charge or
         encumbrance upon any property or assets of the Company or any of its
         subsidiaries pursuant to, any contract, indenture, mortgage, loan
         agreement, note, lease or other instrument to which the Company or any
         of its subsidiaries is a party or by which it or any of them may be
         bound, or to which any of the property or assets of the Company or any
         of its subsidiaries is subject, nor will such action result in any
         breach or violation of, or default under, the provisions of the charter
         or by-laws of the Company or of any applicable law, administrative
         regulation or administrative or court decree.

                  (b) Each Selling Stockholder represents and warrants to, and
agrees with, each Purchaser that:

                  (i) Such Selling Stockholder is the lawful owner of the
         Securities to be sold by such Selling Stockholder hereunder and upon
         sale and delivery of, and payment for, such Securities, as provided
         herein, such Selling Stockholder will convey good and marketable title
         to such Securities, free and clear of all liens, encumbrances, equities
         and claims whatsoever.

                  (ii) Such Selling Stockholder has not taken and will not take,
         directly or indirectly, any action designed to or which has constituted
         or which might reasonably be expected to cause or result, under the
         Exchange Act or otherwise, in stabilization or manipulation of the
         price of any security of the Company to facilitate the sale or resale
         of the Securities and has not effected any sales of shares of Common
         Stock which, if effected by the issuer, would be required to be
         disclosed in response to Item 701 of Regulation S-K.

                (iii) No consent, approval, authorization or order of any court
         or governmental agency or body is required for the consummation by such
         Selling Stockholder of the transactions contemplated herein, except
         such as may have been obtained under the Act and such as may be
         required under the blue sky laws of any jurisdiction in connection with
         the purchase and distribution of the Securities by the Purchasers and
         such other approvals as have been obtained.

                  (iv) Neither the sale of the Securities being sold by such
         Selling Stockholder nor the consummation of any other of the
         transactions herein contemplated by such Selling Stockholder or the
         fulfillment of the terms hereof by such Selling Stockholder will
         conflict with, result in a breach or violation of, or constitute a
         default under any law or the charter or by-laws of such Selling
         Stockholder or the terms of any indenture or other agreement or
         instrument to which such Selling Stockholder or any of its subsidiaries
         is a party or bound, or any judgement, order or decree applicable to
         such Selling Stockholder or any of its subsidiaries of any court,
         regulatory body, administrative agency, governmental body or arbitrator
         having jurisdiction over such Selling Stockholder or any of its
         subsidiaries.


                             Page 16 of 34 pages
<PAGE>   5
                  2. Purchase and Sale. Subject to the terms and conditions and
in reliance upon the representations and warranties herein set forth, the
Selling Stockholders agree, severally and not jointly, to sell to each
Purchaser, and each Purchaser agrees, severally and not jointly, to purchase
from the Selling Stockholders, at a purchase price of $9.125 per share, the
amount of the Securities set forth opposite such Purchaser's name in Schedule I
hereto.

                  3. Delivery and Payment. Delivery of and payment for the
Securities shall be made at 10:00 AM, New York City time, on April 17, 1997, or
such later date (not later than April 24, 1997) as the Purchasers shall
designate, which date and time may be postponed by agreement among the
Purchasers, the Company and the Selling Stockholders or as provided in Section 9
hereof (such date and time of delivery and payment for the Securities being
herein called the "Closing Date"). Delivery of the Securities shall be made to
the Purchasers against payment by the several Purchasers of the respective
aggregate purchase prices of the Securities being sold by the Company and each
of the Selling Stockholders to or upon the order of the Company and the Selling
Stockholders by wire transfer of same day funds to accounts designated by each
of them. Delivery of the Securities shall be made at such location as the
Purchasers shall reasonably designate at least one business day in advance of
the applicable Closing Date and payment for such Securities shall be made at the
office of Vinson & Elkins L.L.P., 2300 First City Tower, 1001 Fannin, Houston,
Texas. Certificates for the Securities shall be registered in such names and in
such denominations as the Purchasers may request not less than three full
business days in advance of the Closing Date.

                  The Company and the Selling Stockholders agree to have the
Securities available for inspection, checking and packaging by the Purchasers in
New York, New York, not later than 1:00 PM on the business day prior to the
Closing Date.

                  Each Selling Stockholder will pay all applicable state
transfer taxes, if any, involved in the transfer to the several Purchasers of
the Securities to be purchased by them from such Selling Stockholder and the
respective Purchasers will pay any additional stock transfer taxes involved in
further transfers.

                  4. Offering by Purchasers. It is understood that the several
Purchasers propose to offer the Securities for sale to the public as set forth
in the Prospectus.

                  5. Agreements.

                  (a) The Company agrees with the several Purchasers that:

                  (i) Prior to the termination of the offering of the
         Securities, the Company will not file any amendment of the Registration
         Statements or supplement to the Prospectus without your prior consent.
         Subject to the foregoing sentence, if either Registration Statement has
         become or becomes effective pursuant to Rule 430A, or filing of the
         Prospectus is otherwise required under Rule 424(b), the Company will
         cause the Prospectus, properly completed, and any supplement thereto to
         be filed with the Commission pursuant to the applicable paragraph of
         Rule 424(b) within the time period prescribed and will provide


                             Page 17 of 34 pages
<PAGE>   6
         evidence satisfactory to the Purchasers of such timely filing. The
         Company will promptly advise the Purchasers (A) when the Prospectus,
         and any supplement thereto, shall have been filed (if required) with
         the Commission pursuant to Rule 424(b), (B) when, prior to termination
         of the offering of the Securities, any amendment to the Registration
         Statement shall have been filed or become effective, (C) of any request
         by the Commission for any amendment of either Registration Statement or
         supplement to the Prospectus or for any additional information, (D) of
         the issuance by the Commission of any stop order suspending the
         effectiveness of either Registration Statement or the institution or
         threatening of any proceeding for that purpose and (E) of the receipt
         by the Company of any notification with respect to the suspension of
         the qualification of the Securities for sale in any jurisdiction or the
         initiation or threatening of any proceeding for such purpose. The
         Company will use its best efforts to prevent the issuance of any such
         stop order and, if issued, to obtain as soon as possible the withdrawal
         thereof.

                  (ii) If, at any time when a prospectus relating to the
         Securities is required to be delivered under the Act, any event occurs
         as a result of which the Prospectus as then supplemented would include
         any untrue statement of a material fact or omit to state any material
         fact necessary to make the statements therein in the light of the
         circumstances under which they were made not misleading, or if it shall
         be necessary to amend either Registration Statement or supplement
         either Prospectus to comply with the Act or the rules thereunder, the
         Company promptly will (i) prepare and file with the Commission, subject
         to the second sentence of paragraph (a) of this Section 5, an amendment
         or supplement which will correct such statement or omission or effect
         such compliance and (ii) supply any supplemented Prospectus to you in
         such quantities as you may reasonably request.

                  (iii) As soon as practicable, the Company will make generally
         available to its security holders and to the Purchasers an earnings
         statement or statements of the Company and its subsidiaries which will
         satisfy the provisions of Section 11(a) of the Act and Rule 158 under
         the Act.

                  (iv) The Company will furnish to the Purchasers and counsel
         for the Purchasers, without charge, copies of the Registration
         Statement (including exhibits thereto) and, so long as delivery of a
         prospectus by an Purchaser or dealer may be required by the Act, as
         many copies of each Prospectus and any supplement thereto as the
         Purchasers may reasonably request. The Company will pay the expenses of
         printing or other production of all documents relating to the offering.

                  (v) The Company will arrange for the qualification of the
         Securities for sale under the laws of such jurisdictions as the
         Purchasers may designate, and will maintain such qualifications in
         effect so long as required for the distribution of the Securities and
         will pay the fee of the National Association of Securities Dealers,
         Inc., in connection with its review of the offering.


                             Page 18 of 34 pages
<PAGE>   7
                  (vi) The Company will not, for a period of 90 days following
         the Execution Time, without the prior written consent of Salomon
         Brothers Inc, offer, sell or contract to sell, or otherwise dispose of,
         directly or indirectly, or announce the offering of, any other shares
         of Common Stock or any securities convertible into, or exchangeable
         for, shares of Common Stock; provided, however, that the Company may
         issue and sell Common Stock pursuant to any employee stock option plan,
         stock ownership plan or dividend reinvestment plan of the Company in
         effect at the Execution Time; and, provided, further, that the Company
         may issue Common Stock in connection with an acquisition provided that
         the recipient of such Common Stock agrees to the foregoing restriction.

                  (b) Each Selling Stockholder agrees with the several
Purchasers that it will not and will cause its affiliates to not during the
period of 45 days following the Execution Time, without the prior written
consent of Salomon Brothers Inc, offer, sell or contract to sell, or otherwise
dispose of, directly or indirectly, or announce the offering of, any other
shares of Common Stock beneficially owned by such person, or any securities
convertible into, or exchangeable for, shares of Common Stock.

                  6. Conditions to the Obligations of the Purchasers. The
obligations of the Purchasers to purchase the Securities shall be subject to the
accuracy of the representations and warranties on the part of the Company and
the Selling Stockholders contained herein as of the Execution Time, the Closing
Date and any settlement date pursuant to Section 3 hereof, to the accuracy of
the statements of the Company and the Selling Stockholders made in any
certificates pursuant to the provisions hereof, to the performance by the
Company and the Selling Stockholders of their respective obligations hereunder
and to the following additional conditions:

                  (a) If filing of either Prospectus, or any supplement thereto,
         is required pursuant to Rule 424(b), the Prospectus, and any such
         supplement, will be filed in the manner and within the time period
         required by Rule 424(b); and no stop order suspending the effectiveness
         of either Registration Statement shall have been issued and no
         proceedings for that purpose shall have been instituted or threatened.

                  (b) The Company shall have furnished to the Purchasers the
opinion of Vinson & Elkins L.L.P., counsel for the Company, dated the Closing
Date, to the effect that:

                  (i) each of the Company and Hugoton Exploration Company, HEC
         Trading Company, AmGas Corporation, and Tiffany Gathering, Inc.
         (individually a "Subsidiary" and collectively the "Subsidiaries") has
         been duly incorporated and is validly existing as a corporation in
         good standing under the laws of the jurisdiction in which it is
         chartered or organized, with full corporate power and authority to own
         its properties and conduct its business as described in the Prospectus;

                  (ii) all the outstanding shares of capital stock of each
         Subsidiary have been duly and validly authorized and issued and are
         fully paid and nonassessable, and, except as otherwise set forth in
         either Prospectus, all outstanding shares of capital stock of the
         Subsid-


                             Page 19 of 34 pages
<PAGE>   8
         iaries are owned of record by the Company either directly or through
         wholly owned subsidiaries free and clear of any perfected security
         interest and, to the knowledge of such counsel, after due inquiry, any
         other security interests, claims, liens or encumbrances;

                  (iii) the Company's authorized equity capitalization is as set
         forth in the financial statements of the Company included in each
         Prospectus; the capital stock of the Company conforms to the
         description thereof contained in the Prospectus; the outstanding shares
         of Common Stock (including the Securities being sold hereunder by the
         Selling Stockholders) have been duly and validly authorized and issued
         and are fully paid and nonassessable; the certificates for the
         Securities are in valid and sufficient form; and the holders of
         outstanding shares of capital stock of the Company are not entitled to
         preemptive or other rights to subscribe for the Securities;

                  (iv) to the best knowledge of such counsel, there is no
         pending or threatened action, suit or proceeding before any court or
         governmental agency, authority or body or any arbitrator involving the
         Company or any of its subsidiaries of a character required to be dis-
         closed in the Registration Statement which is not adequately disclosed
         in the Prospectus, and there is no franchise, contract or other
         document of a character required to be described in either Registration
         Statement or Prospectus, or to be filed as an exhibit, which is not
         described or filed as required;

                  (v) each Registration Statement has become effective under the
         Act; any required filing of the Prospectus, and any supplements
         thereto, pursuant to Rule 424(b) has been made in the manner and within
         the time period required by Rule 424(b); to the best knowledge of such
         counsel, no stop order suspending the effectiveness of either
         Registration Statement has been issued, no proceedings for that purpose
         have been instituted or threatened and each Registration Statement and
         the Prospectus (other than the financial statements and other financial
         and statistical information and oil and gas reserve reports and data
         contained therein as to which such counsel need express no opinion)
         comply as to form in all material respects with the applicable
         requirements of the Act and the rules thereunder; and such counsel has
         no reason to believe that at the Effective Date and as of the Closing
         Date either Registration Statement contained any untrue statement of a
         material fact or omitted to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading or that either Prospectus includes any untrue statement of a
         material fact or omits to state a material fact necessary to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading;

                  (vi) this Agreement has been duly authorized, executed and
         delivered by the Company;

                  (vii) no consent, approval, authorization or order of any
         court or governmental agency or body is required for the consummation
         of the transactions contemplated herein, except such as have been
         obtained under the Act and such as may be required under the blue sky
         laws of any jurisdiction or the National Association of Securities
         Dealers, Inc. in


                             Page 20 of 34 pages
<PAGE>   9
         connection with the purchase and distribution of the Securities by the
         Purchasers and such other approvals (specified in such opinion) as have
         been obtained;

                  (viii) neither the issue and sale of the Securities, nor the
         consummation of any other of the transactions herein contemplated nor
         the fulfillment of the terms hereof will conflict with, result in a
         breach or violation of, or constitute a default under any law or the
         charter or by-laws of the Company or the terms of any indenture or
         other agreement or instrument known to such counsel and to which the
         Company or any of its subsidiaries is a party or bound or any judgment,
         order or decree known to such counsel to be applicable to the Company
         or any of its subsidiaries of any court, regulatory body,
         administrative agency, governmental body or arbitrator having
         jurisdiction over the Company or any of its subsidiaries; and

                  (ix) no holders of securities of the Company have rights to
         the registration of such securities under the Registration Statement
         except such holders who have elected not to participate in the offering
         contemplated thereby.

In rendering such opinion, such counsel may rely (A) as to matters involving the
application of laws of any jurisdiction other than the State of Delaware or
Texas or the United States, to the extent they deem proper and specified in such
opinion, upon the opinion of other counsel of good standing whom they believe to
be reliable and who are satisfactory to counsel for the Purchasers and (B) as to
matters of fact, to the extent they deem proper, on certificates of responsible
officers of the Company and public officials. Reference to the Prospectus in
this paragraph (b) include any supplements thereto at the Closing Date.

                  (c) The Selling Stockholders shall have furnished to the
Purchasers the opinion of Martin Byman, Esq., counsel for Odyssey Partners,
L.P., and Simpson Thacher & Bartlett, counsel for the other Selling Stockholders
(each with respect to the Selling Stockholder or Selling Stockholders it
represents), dated the Closing Date, to the effect that:

                  (i) this Agreement has been duly authorized, executed and
         delivered by the Selling Stockholder(s) and each Selling Stockholder
         has full partnership power and authority to sell, transfer and deliver
         in the manner provided in this Agreement the Securities being sold by
         such Selling Stockholder hereunder;

                  (ii) each Purchaser that is a "bona fide purchaser" (within
         the meaning of Section 8-302(1) of the New York Uniform Commercial Code
         (the "NY-UCC")), will, upon delivery by such Selling Stockholder to
         such Purchaser of certificates for the Securities being sold hereunder
         by such Selling Stockholder against payment therefor as provided
         herein, acquire such Securities free of any "adverse claim" (within the
         meaning of Section 8-302(2) of the NY-UCC);

                  (iii) no consent, approval, authorization or order of any
         federal or New York governmental agency or body or, with respect to
         First Reserve Secured Energy Asset Fund,


                             Page 21 of 34 pages
<PAGE>   10
         Limited Partnership ("SEA") or First Reserve Fund V, Limited
         Partnership ("Fund V"), any Delaware governmental agency or body acting
         pursuant to the Delaware Limited Partnership Act or, to such counsel's
         knowledge, any Federal or New York court or, with respect to SEA or
         Fund V, any Delaware court acting pursuant to the Delaware Limited
         Partnership Act is required for the consummation by any such Selling
         Stockholder of the transactions provided for herein, except for
         registration under the Act and the Securities Exchange Act of 1934, as
         amended, and such as may be required under the blue sky laws of New
         York in connection with the purchase and distribution of the Securities
         by the Purchasers and such other approvals (specified in such opinion)
         as have been obtained; and

                  (iv) neither the sale of the Securities being sold by any such
         Selling Stockholder nor the consummation of any other of the
         transactions provided for herein by any such Selling Stockholder will
         result in a violation of any federal or New York law or the Delaware
         Limited Partnership Act or breach or result in a default under the
         Agreement of Limited Partnership or Certificate of Limited Partnership
         of such Selling Stockholder or the terms of any indenture or other
         agreement or instrument known to such counsel and to which any such
         Selling Stockholder is a party or bound, nor will such action violate
         any judgment, order or decree known to such counsel to be issued
         pursuant to any Federal or New York statute or the Delaware Limited
         Partnership Act by any court, regulatory body, administrative agency or
         governmental body having jurisdiction over any Selling Stockholder.

In rendering such opinion, such counsel may rely as to matters of fact, to the
extent they deem proper, on certificates of the Selling Stockholders and public
officials.

                  (d) The Purchasers shall have received from Baker & Botts,
L.L.P., counsel for the Purchasers, such opinion or opinions, dated the Closing
Date, with respect to the issuance and sale of the Securities, each Registration
Statement, each Prospectus (together with any supplement thereto) and other
related matters as the Purchasers may reasonably require, and the Company and
each Selling Stockholder shall have furnished to such counsel such documents as
they request for the purpose of enabling them to pass upon such matters.

                  (e) The Company shall have furnished to the Purchasers a
certificate of the Company, signed by the Chairman of the Board or the President
and the principal financial or accounting officer of the Company, dated the
Closing Date, to the effect that the signers of such certificate have carefully
examined the Registration Statement, the Prospectus, any supplement to the
Prospectus and this Agreement and that:

                  (i) the representations and warranties of the Company in this
         Agreement are true and correct in all material respects on and as of
         the Closing Date with the same effect as if made on the Closing Date
         and the Company has complied with all the agreements and satisfied all
         the conditions on its part to be performed or satisfied at or prior to
         the Closing Date;



                             Page 22 of 34 pages
<PAGE>   11
                  (ii) no stop order suspending the effectiveness of either
         Registration Statement has been issued and no proceedings for that
         purpose have been instituted or, to the Company's knowledge,
         threatened; and

                  (iii) since the date of the most recent financial statements
         included in each Prospectus (exclusive of any supplement thereto),
         there has been no material adverse change in the condition (financial
         or other), earnings, business or properties of the Company and its
         subsidiaries, whether or not arising from transactions in the ordinary
         course of business, except as set forth in or contemplated in the
         Prospectus (exclusive of any supplement thereto).

                  (f) Each Selling Stockholder shall have furnished to the
Purchasers a certificate, signed by the Chairman of the Board or the President
or the principal financial or accounting officer (or a Managing Director or
comparable official of the general partner) of such Selling Stockholder, dated
the Closing Date, to the effect that the representations and warranties of such
Selling Stockholder in this Agreement are true and correct in all material
respects on and as of the Closing Date to the same effect as if made on the
Closing Date.

                  (g) At the Execution Time and at the Closing Date, Ernst &
Young shall have furnished to the Purchasers a letter or letters, dated
respectively as of the Execution Time and as of the Closing Date, in form and
substance satisfactory to the Purchasers, confirming that they are independent
accountants within the meaning of the Act and the applicable published rules and
regulations thereunder and stating in effect that:

                  (i) in their opinion the audited financial statements and
         financial statement schedules included in each Registration Statement
         and each Prospectus and reported on by them comply in form in all
         material respects with the applicable accounting requirements of the
         Act and the related published rules and regulations;

                  (ii) on the basis of a reading of the latest unaudited
         financial statements made available by the Company and its
         subsidiaries; carrying out certain specified procedures (but not an
         examination in accordance with generally accepted auditing standards)
         which would not necessarily reveal matters of significance with respect
         to the comments set forth in such letter; a reading of the minutes of
         the meetings of the stockholders, directors and committees of the
         Company and the Subsidiaries; and inquiries of certain officials of the
         Company who have responsibility for financial and accounting matters of
         the Company and its subsidiaries as to transactions and events
         subsequent to December 31, 1996, nothing came to their attention which
         caused them to believe that:

                           (1) any unaudited financial statements included in
                  each Registration Statement and each Prospectus do not comply
                  in form in all material respects with applicable accounting
                  requirements of the Act and with the published rules and
                  regulations of the Commission with respect to registration
                  statements on Form S-3; and said unaudited financial
                  statements are not in conformity with generally accepted


                             Page 23 of 34 pages
<PAGE>   12
                  accounting principles applied on a basis substantially
                  consistent with that of the audited financial statements
                  included in such Registration Statement and such Prospectus;
                  or

                           (2) with respect to the period subsequent to December
                  31, 1996, there were any changes, at a specified date not more
                  than five business days prior to the date of the letter, in
                  the long-term debt of the Company and its subsidiaries or
                  capital stock of the Company or decreases in the stockholders'
                  equity of the Company as compared with the amounts shown on
                  the December 31, 1996 consolidated balance sheet included in
                  each Registration Statement and each Prospectus, or for the
                  period from December 31, 1996 to such specified date there
                  were any decreases, as compared with the corresponding period
                  in the preceding year, in net revenues or income before income
                  taxes or in total or per share amounts of net income of the
                  Company and its subsidiaries, except in all instances for
                  changes or decreases set forth in such letter, in which case
                  the letter shall be accompanied by an explanation by the
                  Company as to the significance thereof unless said explanation
                  is not deemed necessary by the Purchasers.

                  (iii) they have performed certain other specified procedures
         as a result of which they determined that certain information of an
         accounting, financial or statistical nature (which is limited to
         accounting, financial or statistical information derived from the
         general accounting records of the Company and its subsidiaries) set
         forth in each Registration Statement and each Prospectus, agrees with
         the accounting records of the Company and its subsidiaries, excluding
         any questions of legal interpretation.

         References to Prospectus in this paragraph (g) include any supplement
         thereto at the date of the letter.

                  (h) Subsequent to the Execution Time or, if earlier, the dates
as of which information is given in each Registration Statement (exclusive of
any amendment thereof) and the Prospectus (exclusive of any supplement thereto),
there shall not have been (i) any change or decrease specified in the letter or
letters referred to in paragraph (g) of this Section 6 or (ii) any change, or
any development involving a prospective change, in or affecting the business or
properties of the Company and its subsidiaries the effect of which, in any case
referred to in clause (i) or (ii) above, is, in the judgment of the Purchasers,
so material and adverse as to make it impractical or inadvisable to proceed with
the offering or delivery of the Securities as contemplated by each Registration
Statement (exclusive of any amendment thereof) and each Prospectus (exclusive of
any supplement thereto).

                  (i) At the Closing Date, the Company shall have furnished to
the Purchasers a letter substantially in the form of Exhibit A hereto from each
officer and director of the Company. addressed to the Purchasers, in which each
such person agrees not to offer, sell or contract to sell, or otherwise dispose
of, directly or indirectly, or announce an offering of, any shares of Common
Stock beneficially owned by such person or any securities convertible into, or
exchangeable for,


                             Page 24 of 34 pages
<PAGE>   13
shares of Common Stock for a period of 90 days following the Execution Time
without the prior written consent of the Purchasers.

                  (j) At the Execution Time, Ryder Scott Company Petroleum
Engineers shall have furnished to the Purchasers a letter dated as of the
Execution Time substantially in the form heretofore approved by you.

                  (k) Prior to the Closing Date, the Company shall have
furnished to the Purchasers such further information, certificates and documents
as the Purchasers may reasonably request.

                  If any of the conditions specified in this Section 6 shall not
have been fulfilled in all material respects when and as provided in this
Agreement, or if any of the opinions and certificates mentioned above or
elsewhere in this Agreement shall not be in all material respects reasonably
satisfactory in form and substance to the Purchasers and counsel for the
Purchasers, this Agreement and all obligations of the Purchasers hereunder may
be canceled at, or at any time prior to, the Closing Date by the Purchasers.
Notice of such cancellation shall be given to the Company and each Selling
Stockholder in writing or by telephone or telegraph confirmed in writing.

                  The documents required to be delivered by this Section 6 shall
be delivered on the Closing Date.

                  7. Reimbursement of Expenses. If the sale of the Securities
provided for herein is not consummated because any condition to the obligations
of the Purchasers set forth in Section 6 hereof is not satisfied, because of any
termination pursuant to Section 10 hereof or because of any refusal, inability
or failure on the part of the Company or any Selling Stockholder to perform any
agreement herein or comply with any provision hereof other than by reason of a
default by any of the Purchasers, the Company will reimburse the Purchasers
severally upon demand for all out-of-pocket expenses (including reasonable fees
and disbursements of counsel) that shall have been incurred by them in
connection with the proposed purchase and sale of the Securities. If the Company
is required to make any payments to the Purchasers under this Section 7 because
of any Selling Stockholder's refusal, inability or failure to satisfy any
condition to the obligations of the Purchasers set forth in Section 6, such
Selling Stockholders shall reimburse the Company on demand for all amounts so
paid, pro rata in proportion to the percentage of Securities to be sold by each.

                  8. Indemnification and Contribution. (a) The Company agrees to
indemnify and hold harmless each Purchaser, the directors, officers, employees
and agents of each Purchaser and each person who controls any Purchaser within
the meaning of either the Act or the Securities Exchange Act of 1934 (the
"Exchange Act") against any and all losses, claims, damages or liabilities,
joint or several, to which they or any of them may become subject under the Act,
the Exchange Act or other Federal or state statutory law or regulation, at
common law 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 a material fact contained in the
registration statement for the registration of the Securities as originally
filed or in any amendment thereof, or in any Preliminary Prospectus or each
Prospectus, or in any amendment thereof or


                             Page 25 of 34 pages
<PAGE>   14
supplement thereto, 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 agrees to reimburse
each such indemnified party, as incurred, for any legal or other expenses
reasonably incurred by them in connection with investigating or defending any
such loss, claim, damage, liability or action; provided, however, that the
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 any such untrue
statement or alleged untrue statement or omission or alleged omission made
therein in reliance upon and in conformity with written information furnished to
the Company by or on behalf of any Purchaser through the Purchasers specifically
for inclusion therein. This indemnity agreement will be in addition to any
liability which the Company may otherwise have.

                  (b) Each Selling Stockholder, severally and not jointly,
agrees to indemnify and hold harmless each Purchaser, the directors, officers,
employees and agents of each Purchaser and each person who controls any
Purchaser within the meaning of either the Act or the Exchange Act to the same
extent as the foregoing indemnity from the Company to each Purchaser, but only
with reference to written information furnished to the Company by or on behalf
of such Selling Stockholder specifically for inclusion in the documents referred
to in the foregoing indemnity. This indemnity agreement will be in addition to
any liability which any Selling Stockholder may otherwise have.

                  (c) [Intentionally Omitted]

                  (d) Promptly after receipt by an indemnified party under this
Section 8 of notice of the commencement of any action, such indemnified party
will, if a claim in respect thereof is to be made against the indemnifying party
under this Section 8, notify the indemnifying party in writing of the
commencement thereof; but the failure so to notify the indemnifying party (i)
will not relieve it from liability under paragraph (a) or (b) above unless and
to the extent it did not otherwise learn of such action and such failure results
in the forfeiture by the indemnifying party of substantial rights and defenses
and (ii) will not, in any event, relieve the indemnifying party from any
obligations to any indemnified party other than the indemnification obligation
provided in paragraph (a) or (b) above. The indemnifying party shall be entitled
to appoint counsel of the indemnifying party's choice at the indemnifying
party's expense to represent the indemnified party in any action for which
indemnification is sought (in which case the indemnifying party shall not
thereafter be responsible for the fees and expenses of any separate counsel
retained by the indemnified party or parties except as set forth below);
provided, however, that such counsel shall be satisfactory to the indemnified
party. Notwithstanding the indemnifying party's election to appoint counsel to
represent the indemnified party in an action, the indemnified party shall have
the right to employ separate counsel (including local counsel), and the
indemnifying party shall bear the reasonable fees, costs and expenses of such
separate counsel if (i) the use of counsel chosen by the indemnifying party to
represent the indemnified party would present such counsel with a conflict of
interest, (ii) the actual or potential defendants in, or targets of, any such
action include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be legal
defenses available to it and/or other indemnified parties which are different
from or additional to those available to the indemnifying party, (iii) the
indemnifying party


                             Page 26 of 34 pages
<PAGE>   15
shall not have employed counsel satisfactory to the indemnified party to
represent the indemnified party within a reasonable time after notice of the
institution of such action or (iv) the indemnifying party shall authorize the
indemnified party to employ separate counsel at the expense of the indemnifying
party. An indemnifying party will not, without the prior written consent of the
indemnified parties, settle or compromise or consent to the entry of any
judgment with respect to any pending or threatened claim, action, suit or
proceeding in respect of which indemnification or contribution may be sought
hereunder (whether or not the indemnified parties are actual or potential
parties to such claim or action) unless such settlement, compromise or consent
includes an unconditional release of each indemnified party from all liability
arising out of such claim, action, suit or proceeding.

                  (e) In the event that the indemnity provided in paragraph (a)
or (b) of this Section 8 is unavailable to or insufficient to hold harmless an
indemnified party for any reason, then each indemnifying party agrees to
contribute to the aggregate losses, claims, damages and liabilities (including
legal or other expenses reasonably incurred in connection with investigating or
defending same) (collectively "Losses") to which the indemnified party may be
subject in such proportion as is appropriate to reflect the relative benefits
received by the Company and the Selling Stockholders on the one hand and by the
Purchasers on the other from the offering of the Securities; provided, however,
that in no case shall any Purchaser (except as may be provided in any agreement
among Purchasers relating to the offering of the Securities) be responsible for
any amount in excess of the underwriting discount or commission applicable to
the Securities purchased by such Purchaser hereunder. If the allocation provided
by the immediately preceding sentence is unavailable for any reason, each
indemnifying party shall contribute in such proportion as is appropriate to
reflect not only such relative benefits but also the relative fault of the
Company and the Selling Stockholders on the one hand and of the Purchasers on
the other in connection with the statements or omissions which resulted in such
Losses as well as any other relevant equitable considerations. Benefits received
by the Company and the Selling Stockholders shall be deemed to be equal to the
total net proceeds from the offering (before deducting expenses), and benefits
received by the Purchasers shall be deemed to be equal to the total underwriting
discounts and commissions, in each case as set forth on the cover page of the
Prospectus. Relative fault shall be determined by reference to whether any
alleged untrue statement or omission relates to information provided by the
Company, the Selling Stockholders or the Purchasers. The Company, the Selling
Stockholders and the Purchasers agree that it would not be just and equitable if
contribution were determined by pro rata allocation or any other method of
allocation which does not take account of the equitable considerations referred
to above. Notwithstanding the provisions of this paragraph (e), no person guilty
of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. For purposes of this Section 8, each person who
controls an Purchaser within the meaning of either the Act or the Exchange Act
and each director, officer, employee and agent of an Purchaser shall have the
same rights to contribution as such Purchaser, and each person who controls the
Company within the meaning of either the Act or the Exchange Act, each officer
of the Company who shall have signed the Registration Statement and each
director of the Company shall have the same rights to contribution as the
Company, subject in each case to the applicable terms and conditions of this
paragraph (e).


                             Page 27 of 34 pages
<PAGE>   16
                  (f) The liability of each Selling Stockholder under such
Selling Stockholder's representations and warranties contained in Section 1
hereof and under the indemnity and contribution agreements contained in this
Section 8 shall be limited to an amount equal to the purchase price of the
Securities sold by such Selling Stockholder to the Purchasers.

                  9. Default by any Purchaser. If any one or more Purchasers
shall fail to purchase and pay for any of the Securities agreed to be purchased
by such Purchaser or Purchasers hereunder and such failure to purchase shall
constitute a default in the performance of its or their obligations under this
Agreement, the remaining Purchasers shall be obligated severally to take up and
pay for (in the respective proportions which the amount of Securities set forth
opposite their names in Schedule I hereto bears to the aggregate amount of
Securities set forth opposite the names of all the remaining Purchasers) the
Securities which the defaulting Purchaser or Purchasers agreed but failed to
purchase; provided, however, that in the event that the aggregate amount of
Securities which the defaulting Purchaser or Purchasers agreed but failed to
purchase shall exceed 10% of the aggregate amount of Securities set forth in
Schedule I hereto, the remaining Purchasers shall have the right to purchase
all, but shall not be under any obligation to purchase any, of the Securities,
and if such nondefaulting Purchasers do not purchase all the Securities, this
Agreement will terminate without liability to any nondefaulting Purchaser, the
Selling Stockholders or the Company. In the event of a default by any Purchaser
as set forth in this Section 9, the Closing Date shall be postponed for such
period, not exceeding seven days, as the Purchasers shall determine in order
that the required changes in the Registration Statement and the Prospectus or in
any other documents or arrangements may be effected. Nothing contained in this
Agreement shall relieve any defaulting Purchaser of its liability, if any, to
the Company, the Selling Stockholders and any nondefaulting Purchaser for
damages occasioned by its default hereunder.

                  10. Termination. This Agreement shall be subject to
termination in the absolute discretion of the Purchasers, by notice given to the
Company prior to delivery of and payment for the Securities, if prior to such
time (i) trading in the Company's Common Stock shall have been suspended by the
Commission or the National Association of Securities Dealers National Market
System or trading in securities generally on the New York Stock Exchange or the
National Association of Securities Dealers National Market System shall have
been suspended or limited or minimum prices shall have been established on
either of such Exchange or Market System, (ii) a banking moratorium shall have
been declared either by Federal or New York State authorities or (iii) there
shall have occurred any outbreak or escalation of hostilities, declaration by
the United States of a national emergency or war or other calamity or crisis the
effect of which on financial markets is such as to make it, in the judgment of
the Purchasers, impracticable or inadvisable to proceed with the offering or
delivery of the Securities as contemplated by the Prospectus (exclusive of any
supplement thereto).

                  11. Representations and Indemnities to Survive. The respective
agreements, representations, warranties, indemnities and other statements of the
Company or its officers, of each Selling Stockholder and of the Purchasers set
forth in or made pursuant to this Agreement will remain in full force and
effect, regardless of any investigation made by or on behalf of any Purchaser,
any Selling Stockholder or the Company or any of the officers, directors or
controlling


                                Page 28 of 34
<PAGE>   17
persons referred to in Section 8 hereof, and will survive delivery of and
payment for the Securities. The provisions of Sections 7 and 8 hereof shall
survive the termination or cancellation of this Agreement.

                  12. Notices. All communications hereunder will be in writing
and effective only on receipt, and, if sent to the Purchasers, will be mailed,
delivered or telegraphed and confirmed to them, care of Salomon Brothers Inc, at
Seven World Trade Center, New York, New York, 10048; or, if sent to the Company,
will be mailed, delivered or telegraphed and confirmed to it at 301 North Main,
Suite 1900, Wichita, Kansas 67202, attention of the legal department; or if sent
to the Selling Stockholders, will be mailed, delivered or telegraphed and
confirmed to them at the addresses set forth in Schedule II hereto.

                  13. Successors. This Agreement will inure to the benefit of
and be binding upon the parties hereto and their respective successors and the
officers and directors and controlling persons referred to in Section 8 hereof,
and no other person will have any right or obligation hereunder.

                  14. Applicable Law. This Agreement will be governed by and
construed in accordance with the laws of the State of New York.


                             Page 29 of 34 pages
<PAGE>   18
                  If the foregoing is in accordance with your understanding of
our agreement, please sign and return to us the enclosed duplicate hereof,
whereupon this letter and your acceptance shall represent a binding agreement
among the Company, the Selling Stockholders and the several Purchasers.

                                 Very truly yours,

                                 HUGOTON ENERGY CORPORATION



                                 By:   /s/ Randall K. Click
                                    -------------------------------
                                 Name:  Randall K. Click
                                 Title: Vice President of Land


                                 ODYSSEY PARTNERS, L.P.



                                 By:   /s/ Jack Nash
                                    -------------------------------
                                 Name:  Jack Nash
                                 Title: General Partner
                                  

                                Page 30 of 34
<PAGE>   19
                                 FIRST RESERVE SECURED ENERGY ASSET  FUND,
                                  LIMITED PARTNERSHIP
                                 AMERICAN GAS & OIL INVESTORS LIMITED
                                  PARTNERSHIP
                                 AMERICAN GAS & OIL INVESTORS II LIMITED
                                  PARTNERSHIP

                                 By:  FIRST RESERVE CORPORATION,
                                       GENERAL PARTNER



                                      By:  /s/ Jonathan Linker
                                          ------------------------
                                      Name:  Jonathan Linker
                                      Title: Managing Director


The foregoing Agreement is hereby
confirmed and accepted as of the
date first above written.

Salomon Brothers Inc and
Jefferies & Company, Inc.

By:  Salomon Brothers Inc


By:  /s/ Robert J. Brooks
    -------------------------
         Vice President


                             Page 31 or 34 pages

<PAGE>   20
                                   SCHEDULE I

                                   PURCHASERS

<TABLE>
<CAPTION>
                                                                       Number of
                                                                 Underwritten Securities
Purchasers                                                           To Be Purchased
- ----------                                                           ---------------
<S>                                                                  <C>
Salomon Brothers Inc ..............................................    1,321,400
Jefferies & Company, Inc...........................................    1,321,400
                                                                       ---------
                                    Total..........................    2,642,800
                                                                       =========
</TABLE>






                             Page 32 of 34 pages
<PAGE>   21
                                   SCHEDULE II

                              SELLING STOCKHOLDERS

<TABLE>
<CAPTION>
Name and Address                                                    Number of Underwritten
- ----------------                                                    Securities to be Sold
                                                                    ----------------------
<S>                                                                 <C>
Odyssey Partners, L.P.
     31 West 52nd Street...................................          2,142,800
     New York, NY 10019
         Attention: Stephen Berger

First Reserve Secured Energy
     Asset Fund, Limited Partnership.......................            106,060
     475 Steamboat Road
     Greenwich, CT 06830
         Attention: William E. Macaulay

American Gas & Oil Investors
     Limited Partnership...................................            196,970
     475 Steamboat Road
     Greenwich, CT 06830
         Attention: William E. Macaulay

AmGO II, Limited Partnership...............................            196,970
     475 Steamboat Road
     Greenwich, CT 06830
         Attention: William E. Macaulay

                                                                    ---------
         Total.............................................         2,642,800
                                                                    =========
</TABLE>







                             Page 33 of 34 pages
<PAGE>   22
                                    EXHIBIT A


                                                                  April 14, 1997


Salomon Brothers Inc
Jefferies & Company Inc.

c/o Salomon Brothers Inc
Seven World Trade Center
New York, New York 10048

Dear Sirs:

         This letter is being delivered to you in connection with the proposed
Purchase Agreement (the "Purchase Agreement"), among Hugoton Energy Corporation,
a Kansas corporation (the "Company"), the Selling Stockholders named therein and
each of you, relating to a purchase of shares of Common Stock, no par value of
the Company ("Common Stock").

         In order to induce you to enter into the Purchase Agreement, the
undersigned agrees not to offer, sell, contract to sell or otherwise dispose of
directly or indirectly, or announce an offering of, any shares of Common Stock
beneficially owed by the undersigned Company or any security convertible into,
or exchangeable for, shares of Common Stock for a period of 90 days following
the day on which the Purchase Agreement is executed without the prior written
consent of Salomon Brothers Inc, except that the undersigned shall be entitled
to pledge, hypothecate or otherwise encumber shares of Common Stock, subject to
the foregoing restrictions being agreed to by the pledgee of such shares.

         If, for any reason, the Purchase Agreement shall be terminated prior to
the Closing Date (as defined in the Purchase Agreement), the agreement set forth
above shall likewise be terminated.


                                                Very truly yours,





                             Page 34 of 34 pages


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