THIS NOTE HAS NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
         AMENDED.  THE TRANSFER OF THIS NOTE IS SUBJECT TO  RESTRICTIONS  ON ITS
         OFFER AND SALE  UNTIL THE  REGISTRATION  REQUIREMENTS  OF SUCH ACT HAVE
         BEEN COMPLIED WITH OR AN EXEMPTION THEREFROM IS AVAILABLE AND THE MAKER
         RESERVES  THE RIGHT TO REFUSE  THE  TRANSFER  OF THIS NOTE  UNTIL  SUCH
         REQUIREMENTS HAVE BEEN MET.


STATE OF TEXAS

COUNTY OF MONTGOMERY                                 DATE:  September ____, 1997


                           $3,000,000 PROMISSORY NOTE
                               DUE AUGUST 31, 1999


     As set forth below,  BLACK WARRIOR  WIRELINE  CORP, a Delaware  corporation
("Maker") promises to pay to DIAMONDBACK DIRECTIONAL, INC. ("Payee"), the sum of
$3,000,000  in lawful money of the United States for value  received  payable at
13843 Highway 105 West, Suite 212, Conroe,  Texas 77304, or any other address as
designated by the Payee, from time to time.

                                       I.
                                   DEFINITIONS

     As used herein, the term "Agreement" shall mean that certain Asset Purchase
Agreement  dated effective  September 1, 1997 between Maker,  as Purchaser,  and
Payee, as Seller, relating to Maker's acquisition of Seller's assets.

                                       II.
                                  PAYMENT TERMS

     This note is subject  to the terms of the  Agreement,  including  the terms
thereof relating to adjustment of the principal balance hereof.  This note shall
be due and  payable on August 31,  1999 or on the date that  William L.  Jenkins
ceases to be President of Maker or on the date that William L. Jenkins ceases to
be a shareholder of Maker, whichever occurs first.

                                      III.
                                    INTEREST

     This Note  shall  bear  interest  at the rate of six and  one-half  percent
(6.5%)  per annum  from  September  1, 1997  until  paid in full,  on the unpaid
balance. Interest shall be due and payable quarterly, beginning January 2, 1998,
and continuing on the second day of April, July October and January  thereafter,
until paid in full.  In the event Maker fails to pay any  interest or  principal
when due  hereunder,  the  rate of  interest  on the  amount  past due  shall be
increased to eleven percent (11%).

                                       IV.
                                RIGHT OF PAYMENT

     This Note may be prepaid, in whole or in part, at any time without penalty.

                                       V.
                        DEFINITION OF AN EVENT OF DEFAULT

     The following  shall  constitute and event of default:  failure to pay when
due any  installment  of principal or interest of this Note;  the issuance of an
writ of  garnishment  or writ of attachment  as to any property of Maker,  which
writ of garnishment or attachment is not cured within thirty (30) days after its
issuance.



                                       VI.
                             COLLECTION, WAIVER, ETC

     In the event of any  Default,  then Payee may, if such default is not cured
within ten (10) days after  receipt of written  notice  thereof from Payee,  and
without further notice,  declare the unpaid principal  balance hereof,  together
with earned and unpaid interest, immediately due and payable.

     Each  maker,  indorser,  and  guarantor  or other  surety of this Note does
hereby waive demand,  grace,  presentment for payment,  and protest, and further
does hereby  agree and consent  that this Note may be renewed,  and the time for
payment extended without notice, and without releasing any of the parties.

     In the  event of any  default  by any  party as to any  duty,  warranty  or
undertaking  owed to  another  party,  which  default  results in efforts by the
non-defaulting  party to remedy  same  (whether a lawsuit is filed or not),  the
defaulting  party shall pay,  in addition to such other sums as may be due,  all
costs and expenses of such efforts,  including, but not limited to, a reasonable
attorney's fee.

     No delay or  omission  on the part of the  holder in  exercising  any right
hereunder  shall  operate as a waiver of such right or of any other  right under
this Note.  A waiver on any one  occasion  shall not be construed as a bar to or
waiver of any right or remedy on any future occasion.

                                                     BLACK WARRIOR WIRELINE CORP



                                                     BY:      William L. Jenkins
                                                     ITS:     President








         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE  SECURITIES  ACT OF 1933,  AS  AMENDED.  THE  TRANSFER OF THE
         SECURITIES  REPRESENTED BY THIS  CERTIFICATE IS SUBJECT TO RESTRICTIONS
         ON THEIR OFFER AND SALE UNTIL THE REGISTRATION REQUIREMENTS OF SUCH ACT
         HAVE BEEN COMPLIED WITH OR AN EXEMPTION  THEREFROM IS AVAILABLE AND THE
         COMPANY  RESERVES THE RIGHT TO REFUSE THE  TRANSFER OF SUCH  SECURITIES
         UNTIL SUCH REQUIREMENTS HAVE BEEN MET.


STATE OF TEXAS

COUNTY OF MONTGOMERY                                 DATE:  September ____, 1997


                       PROMISSORY NOTE FOR NET RECEIVABLES
                               DUE AUGUST 31, 1999


     As set forth below,  BLACK WARRIOR  WIRELINE  CORP, a Delaware  corporation
("Maker") promises to pay to DIAMONDBACK DIRECTIONAL,  INC. ("Payees"),  the sum
of $341,096 in lawful money of the United States for value  received  payable at
13843 Highway 105 West, Suite 212,  Conroe,  Texas 77304 or any other address as
designated by the Payees, from time to time.

                                       I.
                                   DEFINITIONS

     As used herein, the term "Agreement" shall mean that certain Asset Purchase
Agreement  dated effective  September 1, 1997 between Maker,  as Purchaser,  and
Payee, as Seller, relating to Maker's acquisition of Seller's assets.

                                       II.
                                  PAYMENT TERMS

     This note is subject  to the terms of the  Agreement,  including  the terms
thereof relating to adjustment of the principal balance hereof.  This note shall
be due and  payable on August 31,  1999 or on the date that  William L.  Jenkins
ceases to be President of Maker or on the date that William L. Jenkins ceases to
be a shareholder of Maker, whichever occurs first.

                                      III.
                                    INTEREST

     This Note  shall  bear  interest  at the rate of six and  one-half  percent
(6.5%)  per annum  from  September  1, 1997  until  paid in full,  on the unpaid
balance. Interest shall be due and payable quarterly, beginning January 2, 1998,
and continuing on the second day of April, July, October and January thereafter,
until paid in full.  In the event Maker fails to pay any  interest or  principal
when due  hereunder,  the  rate of  interest  on the  amount  past due  shall be
increased to eleven percent (11%).

                                       IV.
                                RIGHT OF PAYMENT

     This Note may be prepaid, in whole or in part, at any time without penalty.

                                       V.
                        DEFINITION OF AN EVENT OF DEFAULT

     The following  shall  constitute and event of default:  failure to pay when
due any  installment  of principal or interest of this Note;  the issuance of an
writ of  garnishment  or writ of attachment  as to any property of Maker,  which
writ of garnishment or attachment is not cured within thirty (30) days after its
issuance.




                                       VI.
                             COLLECTION, WAIVER, ETC

     In the event of any  Default,  then Payee may, if such default is not cured
within ten (10) days after  receipt of written  notice  thereof from Payee,  and
without further notice,  declare the unpaid principal  balance hereof,  together
with earned and unpaid interest, immediately due and payable.

     Each  maker,  indorser,  and  guarantor  or other  surety of this Note does
hereby waive demand,  grace,  presentment for payment,  and protest, and further
does hereby  agree and consent  that this Note may be renewed,  and the time for
payment extended without notice, and without releasing any of the parties.

     In the  event of any  default  by any  party as to any  duty,  warranty  or
undertaking  owed to  another  party,  which  default  results in efforts by the
non-defaulting  party to remedy  same  (whether a lawsuit is filed or not),  the
defaulting  party shall pay,  in addition to such other sums as may be due,  all
costs and expenses of such efforts,  including, but not limited to, a reasonable
attorney's fee.

     No delay or  omission  on the part of the  holder in  exercising  any right
hereunder  shall  operate as a waiver of such right or of any other  right under
this Note.  A waiver on any one  occasion  shall not be construed as a bar to or
waiver of any right or remedy on any future occasion.

                                                     BLACK WARRIOR WIRELINE CORP



                                                     BY:      William L. Jenkins
                                                     ITS:     President