KAISER FRANCIS OIL CO
SC 13D/A, 1999-06-03
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D
                               (FIFTH AMENDMENT)

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934


                             PETROCORP INCORPORATED
                             ----------------------
                                (Name of Issuer)


                     COMMON STOCK, PAR VALUE $.01 PER SHARE
                     --------------------------------------
                         (Title of Class of Securities)


                                  71645N 10 1
                                 (CUSIP Number)


                                TAMARA R. WAGMAN
                           FREDERIC DORWART, LAWYERS
                                 Old City Hall
                             124 East Fourth Street
                              Tulsa, OK 74103-5010
                                 (918) 583-9922
                           (918) 583-8251 (Facsimile)
                     -------------------------------------
                      (Name, Address and Telephone Number
                        of Person Authorized to Receive
                          Notices and Communications)


                                  May 20, 1999
                     -------------------------------------
                     (Date of Event Which Required Filing)


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

         Check the following box if a fee is being paid with this statement [X].


                               Page 1 of 6 Pages

<PAGE>   2

CUSIP No. 71645N 10 1

(1)      Name of Reporting Person S.S.                   Kaiser-Francis Oil Co.
         or I.R.S. Identification No.                    I.R.S. ID. #73-1006655
         of Above Person

(2)      Check the Appropriate Box                       (a)  [ ]
         if a Member of a Group                          (b)  [ ]
         (See instructions)

(3)      SEC Use Only

(4)      Source of Funds (See instructions)              WC

(5)      Check if Disclosure of Legal
         Proceedings is Required
         Pursuant to Items 2(d) or 2(e)

(6)      Citizenship or Place                            State of Delaware
         of Organization

         Number of Shares Beneficially
         Owned by Each Reporting
         Person With:

(7)      Sole Voting Power                               4,327,457

(8)      Shared Voting Power                             None

(9)      Sole Dispositive Power                          4,327,457

(10)     Shared Dispositive Power                        None

(11)     Aggregate Amount Beneficially Owned             4,327,457
         by Each Reporting Person

(12)     Check if the Aggregate Amount in                [ ]
         Row (11) Excludes Certain Shares
         (See instructions)

(13)     Percent of Class Represented by                 49.99%
         Amount in Row (11)

(14)     Type of Reporting Person                        CO
         (See instructions)


                               Page 2 of 6 Pages

<PAGE>   3

                                  SCHEDULE 13D


                      FILED BY KAISER-FRANCIS OIL COMPANY
                     IN CONNECTION WITH TRANSACTIONS IN THE
                        SHARES OF PETROCORP INCORPORATED

ITEM 1.  SECURITY AND ISSUER.

         This statement relates to the common stock, par value $.01 per share
         (the "Common Stock"), of PetroCorp Incorporated, a Texas corporation
         (the "Issuer"). The principal executive offices of the Issuer are
         located at 16800 Greenspoint Park Drive, Suite 300, North Atrium,
         Houston, Texas.

ITEM 2.  IDENTITY AND BACKGROUND.

         (1)      GENERAL. GBK Corporation owns all of the issued and
                  outstanding capital stock of Kaiser-Francis Oil Company
                  ("Kaiser-Francis"). George B. Kaiser ("Kaiser") owns 78.23%
                  of the issued and outstanding capital stock of GBK
                  Corporation. Affiliates of Kaiser own 21.77% of the issued
                  and outstanding capital stock of GBK Corporation.

         (2)      GBK CORPORATION. GBK Corporation is a Delaware corporation,
                  whose principal business is a holding company. The address of
                  the principal business and principal office of GBK
                  Corporation is:

                                    6733 South Yale
                                    Tulsa, Oklahoma 74136

                  With respect to paragraphs (d) and (e) of this Item 2, none.

         (3)      KAISER-FRANCIS OIL COMPANY. Kaiser-Francis is a Delaware
                  corporation, whose principal business is the exploration for
                  and production of oil and gas and the acquisition and
                  disposition of producing oil and gas properties. The address
                  of the principal business and principal office of
                  Kaiser-Francis Oil Company is:

                                    6733 South Yale
                                    Tulsa, Oklahoma 74136

                  With respect to paragraphs (d) and (e) of this Item 2, none.

         (4)      The executive officers, directors, and each person who may be
                  deemed to be controlling GBK Corporation and Kaiser-Francis
                  are as follows:

                             President:                    George B. Kaiser
                             Executive Vice President:     James A. Willis
                             Chief Financial Officer:      D. Joseph Graham
                             Secretary:                    Frederic Dorwart
                             Treasurer:                    Reece A. Hembree
                             Director:                     George B. Kaiser


                               Page 3 of 6 Pages

<PAGE>   4

(5)               (a)      George B. Kaiser

                  (b)      6733 South Yale
                           Tulsa, OK 74136

                  (c)      Independent Oil and Gas Producer
                           KAISER-FRANCIS OIL COMPANY
                           6733 South Yale
                           Tulsa, OK 74136

                  (d)      No

                  (e)      No

                  (f)      United States of America

(6)               (a)      James A. Willis

                  (b)      6733 South Yale
                           Tulsa, OK 74136

                  (c)      Executive Vice President
                           KAISER-FRANCIS OIL COMPANY
                           6733 South Yale
                           Tulsa, OK 74136

                  (d)      No

                  (e)      No

                  (f)      United States of America

(7)               (a)      D. Joseph Graham

                  (b)      6733 South Yale
                           Tulsa, OK 74136

                  (c)      Chief Financial Officer
                           KAISER-FRANCIS OIL COMPANY
                           6733 South Yale
                           Tulsa, OK 74136

                  (d)      No

                  (e)      No

                  (f)      United States of America

(8)               (a)      Frederic Dorwart

                  (b)      Old City Hall
                           124 East Fourth Street
                           Tulsa, OK 74103-5010

                  (c)      Law
                           Old City Hall
                           124 East Fourth Street
                           Tulsa, OK 74103-5010



                               Page 4 of 6 Pages

<PAGE>   5

                  (d)      No
                  (e)      No

                  (f)      United States of America

(9)               (a)      Reece A. Hembree

                  (b)      6733 South Yale
                           Tulsa, OK 74136

                  (c)      Treasurer
                           KAISER-FRANCIS OIL COMPANY
                           6733 South Yale
                           Tulsa, OK 74136

                  (d)      No

                  (e)      No

                  (f)      United States of America

ITEM 3.  SOURCE OR AMOUNT OF FUNDS OR OTHER CONSIDERATION.

                  N/A.  The purpose of this amendment is not related to an
                  acquisition of shares.

ITEM 4.  PURPOSE OF TRANSACTION.

                  PetroCorp Incorporated and Kaiser-Francis Oil Company have
                  signed a letter of intent which would restructure and
                  reorganize the Company. Kaiser-Francis would contract to
                  manage and provide administrative support for all of
                  PetroCorp's operations, both in the United States and Canada.
                  The services arrangement is subject to negotiation of a
                  definitive management agreement, as well as final approval of
                  the Company's Board of Directors and shareholders. It is
                  anticipated that the executive management and staff of
                  PetroCorp would be employees of, or contracted by,
                  Kaiser-Francis. The letter of intent is attached as an
                  exhibit to this filing.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a)      The number of shares of Petro-Corp, beneficially owned by
                  Kaiser-Francis is 4,327,457 which increased 50,000 shares
                  from its October 16, 1998 filing of the Fourth Amendment to
                  Schedule 13D. The 50,000 shares were purchased in open market
                  transactions and were reflected on Form 4 filed with the SEC.


         (b)      On June 25, 1996, Gary R. Christopher purchased 500 shares of
                  Petro-Corp Common Stock at $8-1/8 per share. On May 3, 1996,
                  Mr. Christopher purchased 1,000 shares at $7-1/2 per share.
                  Kaiser-Francis disclaims any beneficial interest in the share
                  held by Mr. Christopher and the shares are not included in
                  the interests reported in this filing.

ITEM 6.  CONTRACTS, ARRANGEMENTS, OR UNDERSTANDINGS WITH RESPECT TO SECURITIES
         OF ISSUER.

         None; except as described in Item 5.


                               Page 5 of 6 Pages

<PAGE>   6

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

      99 (a)      Agreement Dated June 21, 1996 between First Reserve
                  Corporation and Kaiser-Francis Oil Corporation respecting
                  purchase of shares of PetroCorp Common Stock (Previously
                  filed).

      99 (b)      Registration Rights Agreement dated January 18, 1994
                  (Previously filed).

      99 (c)      Assignment Agreement dated July 26, 1996 (Previously filed).

      99 (d)      Agreement Dated October 9, 1996 between LHS Holding Company
                  and Kaiser-Francis Oil Corporation respecting purchase of
                  shares of PetroCorp Common Stock (Previously filed).

      99 (e)      Registration Rights Agreement dated August 24, 1993 between
                  PetroCorp Incorporated and L. S. Holding Company (Previously
                  filed).

      99 (f)      Letter of Intent dated May 20, 1999 between PetroCorp
                  Incorporated and Kaiser-Francis Oil Company (attached hereto).


                                   SIGNATURE

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



                                       Signed: /s/ Gary R. Christopher
                                               ---------------------------
                                               Gary R. Christopher


                               Page 6 of 6 Pages

<PAGE>   7

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit
Number                                Description
- ------                                -----------
<S>               <C>
99 (a)            Agreement Dated June 21, 1996 between First Reserve
                  Corporation and Kaiser-Francis Oil Corporation respecting
                  purchase of shares of PetroCorp Common Stock (Previously
                  filed).

99 (b)            Registration Rights Agreement dated January 18, 1994
                  (Previously filed).

99 (c)            Assignment Agreement dated July 26, 1996 (Previously filed).

99 (d)            Agreement Dated October 9, 1996 between LHS Holding Company
                  and Kaiser-Francis Oil Corporation respecting purchase of
                  shares of PetroCorp Common Stock (Previously filed).

99 (e)            Registration Rights Agreement dated August 24, 1993 between
                  PetroCorp Incorporated and L. S. Holding Company (Previously
                  filed).

99 (f)            Letter of Intent dated May 20, 1999 between PetroCorp
                  Incorporated and Kaiser-Francis Oil Company (attached hereto).
</TABLE>


<PAGE>   1
                                                                  EXHIBIT 99(f)

KAISER-FRANCIS OIL COMPANY      P.O. BOX 2168    TULSA, OKLAHOMA     74121-1468
- -------------------------------------------------------------------------------
                                                           6733 South Yale Ave.
                                                                  (918)494-0000


                                  May 18, 1999


The Board of Directors
PetroCorp, Inc.
16800 Greenspoint Park Drive
Suite 300, North Atrium
Houston, Texas 77060

Gentlemen:

         You have indicated that you are in basic agreement with the proposal
made by Kaiser-Francis Oil Company in a letter dated April 26, 1999 and you
have asked Kaiser-Francis to provide a more detailed proposal. Kaiser-Francis
has obtained additional information from the management of PetroCorp, and while
more information would be necessary to prepare a final agreement, is prepared
to do the following:

         Kaiser-Francis would contract to manage the entire operation of
Petro-Corp. All staff and executive management would be employees of or
contracted by Kaiser-Francis. Some PetroCorp employees would be offered
positions with Kaiser-Francis. This team, along with the Board of Directors,
would be totally responsible for the growth and development of PetroCorp as a
strong viable oil and gas producing company. This would be done by investing
existing and additional capital in quality exploitation, exploration, merger
and acquisition opportunities to the extent that management deems it prudent to
do so. With a strong balance sheet, access to capital and an extremely lean and
flexible organization, PetroCorp can take advantage of many situations
currently or soon to be available. Market and industry conditions would
continually be assessed to maximize the value of the company's assets for the
benefit of the shareholders.

         In return for these services, Kaiser-Francis would receive 100% of the
administrative overhead fees on operated wells and a charge of $50 per lease
per month for non operated properties. In addition Kaiser-Francis would receive
a 2% override and a 25% net profits interest after payout on any new
exploration or exploitation prospect not currently identified by PetroCorp.
This fee would absorb any prospect generator, land and supervisor incentive
compensation and the time of Kaiser-Francis personnel, equipment, supplies,
information services, etc. for currently identified or new prospects. Any new
costs incurred specifically for PetroCorp projects would be charged to
PetroCorp. Any expenditure exceeding $250,000 net to PetroCorp's interest would
require Board of Director approval.


<PAGE>   2

         The new management would commit to lower outside G&A expenses where
possible, such as the reduction in maintenance and license agreements and in
rental expense. A minimum of $4,500,000 in annual G&A savings should be
achieved with this proposal. It is anticipated a transition period of six
months would be necessary to ensure a smooth and complete conversion,
especially in the accounting/MIS systems. Actual property operations transfer
would only take a fraction of that time.

         Kaiser-Francis believes that PetroCorp has a strong and independent
Board of Directors and desires it to stay in place to share in and oversee the
future growth of PetroCorp.

         While this letter goes into more detail than the letter of April 26th,
it is a letter of intent and would be subject to a mutually acceptable
management agreement. If the terms outlined in this letter are agreeable,
please indicate your approval below and we will begin the documentation process
immediately.

         Should you have any questions concerning this letter of intent, please
feel free to contact me at (918) 491-4576 or Joe Graham at (918) 491-4504.
Thank you again for your consideration.

Sincerely yours,

KAISER-FRANCIS OIL COMPANY


/s/ Gary R. Christopher


cc:      George B. Kaiser
         D. Joseph Graham

Agreed to this 20th day of May, 1999

PetroCorp, Inc.

By:     /s/ W N McBEAN
        -----------------
        (Title) President
        -----------------



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