THE SECURITIES  REPRESENTED  BY THIS NOTE AND THE COMMON STOCK ISSUABLE  THEREBY
HAVE NOT BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED  (THE
"SECURITIES ACT") OR ANY OTHER APPLICABLE SECURITIES LAWS AND, ACCORDINGLY,  THE
SECURITIES REPRESENTED BY THIS NOTE MAY NOT BE TRANSFERRED EXCEPT PURSUANT TO AN
EFFECTIVE  REGISTRATION  STATEMENT  UNDER,  OR  IN  A  TRANSACTION  EXEMPT  FROM
REGISTRATION  UNDER,  THE  SECURITIES  ACT  AND IN  ACCORDANCE  WITH  ANY  OTHER
APPLICABLE SECURITIES LAWS.

THIS NOTE MAY BE SUBORDINATE TO CERTAIN  INDEBTEDNESS OF BLACK WARRIOR  WIRELINE
CORP. AS AND TO THE EXTENT SET FORTH IN THAT CERTAIN  AGREEMENT FOR PURCHASE AND
SALE DATED AS OF THE DATE HEREOF  BETWEEN BLACK WARRIOR  WIRELINE  CORP. AND ST.
JAMES CAPITAL PARTNERS, L.P.


                          BLACK WARRIOR WIRELINE CORP.
                     $2,900,000 CONVERTIBLE PROMISSORY NOTE


$2,900,000                     Houston, Texas                   October 10, 1997


         BLACK  WARRIOR  WIRELINE  CORP.,  a Delaware  corporation  (hereinafter
called the "Company," which term includes any directly or indirectly  controlled
subsidiaries or successor entities), for value received,  hereby promises to pay
to St. James Capital Partners, L.P., a Delaware limited partnership (hereinafter
called "Holder"),  or its registered  assigns,  the principal sum of Two Million
Nine Hundred Thousand Dollars ($2,900,000), together with interest on the amount
of such principal sum from time to time outstanding,  payable in accordance with
the terms set forth below. It is the intention of the parties that the principal
sums of this Note shall be advanced in multiple  Advances (as defined below). No
Advance shall be made under this Note if an Event of Default (as defined  below)
exists or would exist but for the passage of time. Interest under the Note shall
accrue on amounts actually advanced.

         THE OBLIGATIONS OF THE COMPANY  CONTAINED IN THIS NOTE ARE SECURED BY A
BORROWER SECURITY  AGREEMENT BETWEEN THE COMPANY AND THE HOLDER DATED AS OF JUNE
5,  1997,  AS MAY  BE  AMENDED  OR  MODIFIED  (THE  "SECURITY  AGREEMENT").  THE
OBLIGATIONS  OF THE COMPANY  CONTAINED  IN THIS NOTE ARE FURTHER  SUBJECT TO THE
TERMS OF A SUBSIDIARY SECURITY AGREEMENT BETWEEN THE SUBSIDIARIES OF THE COMPANY
AND THE HOLDER  DATED AS OF JUNE 5, 1997,  AS MAY BE  AMENDED OR  MODIFIED  (THE
"SUBSIDIARY  SECURITY  AGREEMENT"),  AND A  SUBSIDIARY  GUARANTY  BY EACH OF THE
SUBSIDIARIES  OF THE COMPANY IN FAVOR OF THE HOLDER DATED AS OF JUNE 5, 1997, AS
MAY BE AMENDED OR MODIFIED (THE "SUBSIDIARY GUARANTY").


                                    ARTICLE I

                                   DEFINITIONS

         1.1  Definitions.  For all  purposes of this Note,  except as otherwise
expressly  provided  or unless the  context  otherwise  requires:  (a) the terms
defined in this Article  have the meanings  assigned to them in this Article and
include  the  plural  as well as the  singular;  (b) all  accounting  terms  not
otherwise  defined herein have the meanings  assigned to them in accordance with
generally accepted accounting principles as promulgated from time to time by the
Association  of  Independent  Certified  Public  Accountants;  and (c) the words
"herein,"  "hereof" and  "hereunder"  and other words of similar import refer to
this  Note as a whole  and  not to any  particular  Article,  Section  or  other
subdivision.

         "Advance" means a disbursement of proceeds of this Note.

         "Board of  Directors"  means the board of  directors  of the Company as
elected from time to time or any duly authorized committee of that board.

         "Bridge Loan Note" means the $3,000,000 10% Bridge Loan Promissory Note
of the Company to Holder dated as of June 5, 1997, as may be amended,  modified,
substituted or replaced.

         "Business  Day" means each  Monday,  Tuesday,  Wednesday,  Thursday and
Friday which is not a day on which banking  institutions  in Houston,  Texas are
authorized or obligated by law or executive order to be closed.

         "Common  Stock" means  shares of common  stock,  par value  $0.0005 per
share, of the Company.

         "Conversion  Price" means the price per share  determined in accordance
with Articles IV and V (as adjusted in  accordance  with the terms of this Note)
at which shares of Common Stock shall be delivered to Holder upon  conversion of
this Note.

         "Default"  means any event which is, or after notice or passage of time
would be, an Event of Default.

         "Event of Default" has the meaning specified in Section 3.1.


                                       2


         "Indebtedness"  of any Person  means all  indebtedness  of such Person,
whether  outstanding  on the date of this Note or hereafter  created,  incurred,
assumed  or  guaranteed,  (a) for the  principal  of and  premium,  if any,  and
interest on all debts of the Person whether outstanding on the date of this Note
or  thereafter  created  (i)  for  money  borrowed  by  such  Person  (including
capitalized  lease  obligations),  (ii) for money borrowed by others  (including
capitalized lease obligations) and guaranteed,  directly or indirectly,  by such
Person,  or (iii)  constituting  purchase money  indebtedness,  or  indebtedness
secured by  property  at the time of the  acquisition  of such  property by such
Person, for the payment of which the Person is directly or contingently  liable;
(b) for all  accrued  obligations  of the  Person in  respect  of any  contract,
agreement  or  instrument  imposing  an  obligation  upon the Person to pay over
funds;  (c)  for  all  trade  debt of the  Person;  and  (d) for all  deferrals,
renewals,  extensions  and  refundings  of, and  amendments,  modifications  and
supplements to, any of the indebtedness referred to in (a), (b) or (c) above.

         "Maturity Date", when used with respect to this Note, means October 10,
1999 (or such earlier  date upon which this Note  becomes due and payable  under
Section 3.2).

         "Note"  means  this  $2,900,000  7%  Convertible  Promissory  Note,  as
hereafter amended, modified, substituted or replaced.

         "Original   Convertible  Note"  means  the  $2,000,000  9%  Convertible
Promissory  Note of the Company in favor of the Holder dated as of June 5, 1997,
as may be amended, modified, substituted or replaced.

         "Person" means any individual,  corporation, limited liability company,
partnership,  joint venture,  association,  joint-stock company,  trust, estate,
other  entity,  unincorporated  organization  or  government  or any  agency  or
political subdivision thereof.

         "Subsidiary"  means a corporation  or other entity more than 50% of the
outstanding  voting stock of which,  or more than 50% of the equity  interest in
which, is owned, directly or indirectly,  by the Company or by one or more other
Subsidiaries  of the Company,  or by any  combination  of the Company and one or
more other  Subsidiaries,  provided,  however,  that the following  shall not be
deemed  Subsidiaries  for purposes of this Note:  Black  Warrior  International,
Inc.; Black Warrior  International  (Bermuda),  Ltd.; Black Warrior Oil and Gas,
Inc.;   and   Black   Warrior   Syria,   Ltd.   (collectively,   the   "Inactive
Organizations").  However,  if any Inactive  Organization  begins to conduct any
business (other than activities to "wind down" such organization), such Inactive
Organization  shall be considered a Subsidiary  under this  Agreement  from that
point forward. For purposes of this definition, "voting stock" means stock which
ordinarily has voting power for the election of directors,  whether at all times
or only so long as no senior  class of stock has such voting  power by reason of
any contingency.

                                   ARTICLE II

                                    PAYMENTS

         2.1  Interest.  From the date of this Note through the  Maturity  Date,
interest shall accrue hereunder on the unpaid outstanding  principal sum of this
Note at a rate equal to seven percent (7%) per annum  calculated on the basis of
a 360-day  year.  All past due  amounts of  principal  and  interest  shall bear
interest at fifteen percent (15%) per annum calculated on the basis of a 360-day
year until paid.

         2.2 Payment of  Principal  and  Interest.  Accrued and unpaid  interest
under this Note shall be due and payable on October 10, 1998.  The principal and
all  remaining  accrued  and  unpaid  interest  under this Note shall be due and
payable in full on the Maturity Date. At any time, the Holder may, at its option
and in lieu of cash,  elect to be paid all accrued and unpaid  interest  owed to
Holder by the  Company in the form of Common  Stock,  based on a price per share
equal to the Conversion Price (the "Price Per Share"). The amount of all accrued
and unpaid interest on the Maturity Date shall be divided by the Price Per Share
into a whole number of shares of Common Stock, with the remainder, if any, being
paid in cash.


                                       3


         2.3  Prepayments.  Subject to Holder's  right to  convert,  at any time
before the Maturity Date, the Company may prepay this Note, in whole or in part,
without  penalty or  discount,  upon five days' prior  written  notice  given to
Holder  pursuant  to Section  7.5.  All  payments  made under this Note shall be
applied  first to accrued  interest,  and the  balance,  if any,  to  principal;
provided, however, that interest shall accrue on any remaining principal balance
and shall be payable at the rate provided above.

         2.4 Manner of Payment.  Cash payments of principal and interest on this
Note will be made by delivery of checks to Holder at its address as set forth in
this Note or wire transfers  pursuant to instructions  from Holder.  If the date
upon which the payment of principal and interest is required to be made pursuant
to this Note occurs other than on a Business Day, then such payment of principal
and interest  shall be made on the next  occurring  Business Day following  said
payment date and shall include  interest  through said next  occurring  Business
Day.

         2.5 Security;  Guaranty. This Note is secured by the collateral defined
in the  Security  Agreement  and by the  collateral  defined  in the  Subsidiary
Security  Agreement.  This  Note and the  obligations  hereunder  and  under the
Security  Agreement and the Subsidiary  Security Agreement are guaranteed by the
Subsidiaries of the Company pursuant to the Subsidiary Guaranty.


                                   ARTICLE III

                                    REMEDIES

         3.1 Events of Default. An "Event of Default" occurs if:

                  (a)  the  Company   defaults  in  the  payment  or   mandatory
         prepayment of the principal or interest on this Note, or in the payment
         or a mandatory  prepayment of the principal or interest on the Original
         Convertible  Note or the  Bridge  Loan  Note,  when such  principal  or
         interest becomes due and payable and such default remains uncured for a
         period of five days; or

                  (b) the Company or any Subsidiary  defaults in the performance
         of any covenant made by the Company,  and such default  remains uncured
         for a period  of 45 days in any of (i)  those  certain  Agreements  for
         Purchase  and Sale dated of even date  herewith and as of June 5, 1997,
         respectively,  by and between  the  Company  and Holder (the  "Purchase
         Agreements"),  (ii) the Common Stock  Purchase  Warrants  issued by the
         Company  to  Holder  as of the  date  hereof  and as of June  5,  1997,
         respectively (the "Warrants");  (iii) that certain  Registration Rights
         Agreement  dated as of June 5, 1997,  as may be  thereafter  amended or
         modified, by and between the Company and the Holder,  pursuant to which
         the Company grants to the Holder certain registration rights in respect
         of the  shares of Common  Stock that may be issued  under the  Original
         Convertible  Note,  this Note and upon  exercise of the  Warrants  (the
         "Registration Rights Agreement");  (iv) the Security Agreement; (v) the
         Original  Convertible Note or the Bridge Loan Note; (vi) the Subsidiary
         Security Agreement;  (vii) the Subsidiary Guaranty; or (viii) this Note
         (other  than a default in the  performance  of a covenant  specifically
         addressed  elsewhere in this Section  3.1);  provided that a default in
         the  performance of any covenant in Sections 8(a),  8(b),  8(c),  8(d),
         8(e),  8(f), 8(h), 8(i), 8(j), 8(k), 8(l), 8(m) or 8(n) of the Security
         Agreement  or  Section  6.1 of this Note  shall be an Event of  Default
         immediately upon occurrence; or

                  (c) any  representation or warranty made by the Company or any
         Subsidiary in the Purchase Agreements,  the Warrants,  the Registration
         Rights Agreement,  the Original Convertible Note, the Bridge Loan Note,
         the  Security  Agreement,   the  Subsidiary  Security  Agreement,   the
         Subsidiary  Guaranty,  or this Note or in any certificate  furnished by
         the Company in  connection  with the  consummation  of the  transaction
         contemplated thereby or hereby, is untrue in any material respect as of
         the date of making  thereof  and such  default  remains  uncured  for a
         period of 45 days; or

                  (d) the Company or any Subsidiary defaults in the payment when
         due (whether by lapse of time, by  declaration,  by call for redemption
         or otherwise) of the  principal of or interest on any  Indebtedness  of
         the Company or such Subsidiary  (other than the Indebtedness  evidenced
         by this  Note)  having  an  aggregate  principal  amount  in  excess of
         $100,000  or  on  any  Indebtedness  of  the  Company  to  any  of  its
         stockholders  and such default remains uncured for a period of 45 days;
         or


                                       4


                  (e) a court of  competent  jurisdiction  enters a judgment  or
         judgments  against the Company or any  Subsidiary,  or any  property or
         assets of the  Company  or any  Subsidiary,  for the  payment  of money
         aggregating $100,000 or more in excess of applicable insurance coverage
         (other than the judgment  disclosed on Schedule 3.1(e) hereto) and such
         default remains uncured for a period of 45 days; or

                  (f) a court of competent  jurisdiction  enters (i) a decree or
         order for  relief in respect of the  Company  or any  Subsidiary  in an
         involuntary  case or proceeding  under any applicable  federal or state
         bankruptcy,  insolvency,  reorganization or other similar law or (ii) a
         decree or order  adjudging the Company or any  Subsidiary a bankrupt or
         insolvent,   or  approving  as  properly   filed  a  petition   seeking
         reorganization, arrangement, adjustment or composition of or in respect
         of the Company or any Subsidiary under any applicable  federal or state
         law,  or  appointing  a  custodian,  receiver,  liquidator,   assignee,
         trustee,  sequestrator or other similar  official of the Company or any
         Subsidiary or of any substantial part of the property of the Company or
         any Subsidiary or ordering the winding up or liquidation of the affairs
         of the Company or any Subsidiary and any such decree or order of relief
         or any such other decree or order  remains  unstayed for a period of 90
         days from its date of entry; or

                  (g) the Company or any  Subsidiary  commences a voluntary case
         or  proceeding  under  any  applicable  federal  or  state  bankruptcy,
         insolvency,  reorganization  or other  similar law or any other case or
         proceeding to be adjudicated a bankrupt or insolvent, or the Company or
         any   Subsidiary   files  a   petition,   answer  or  consent   seeking
         reorganization or relief under any applicable  federal or state law, or
         the Company or any  Subsidiary  makes an assignment  for the benefit of
         creditors,  or  admits  in  writing  its  inability  to pay  its  debts
         generally as they become due; or

                  (h) any person or group  (within the meaning of Section  13(d)
         of the Securities Exchange Act of 1934) becomes the beneficial owner of
         40% or more of the total  voting  power of the  Company and was not the
         beneficial  owner  of 40% or  more of the  total  voting  power  of the
         Company as of the date hereof;  provided that the  foregoing  shall not
         include  any  person or group who or which  acquires  the  Warrants  or
         shares of the  Company's  Common Stock  issuable  upon  exercise of the
         Warrants or upon  conversion of the Original  Convertible  Note or this
         Note;  and  further  provided  that such  default has not been cured or
         waived  within  ninety (90) days  following  such change of  beneficial
         ownership.

                  (i) the Company or any Subsidiary  (1) merges or  consolidates
         with or  into  any  other  Person  (unless  the  Company  or any of its
         Subsidiaries  is the  surviving or acquiring  party);  (2) dissolves or
         liquidates;  or (3) sells all or any substantial  portion of its assets
         (unless the purchaser is a Subsidiary of the Company).

         3.2 Acceleration of Maturity.  This Note and all accrued interest shall
automatically  become  immediately  due  and  payable  if an  Event  of  Default
described in Sections  3.1(f),  3.1(g) or 3.1(i) occurs and, this Note shall, at
the  option of the Holder in its sole  discretion,  become  immediately  due and
payable if any other Event of Default occurs,  and in every such case the Holder
of the Note may declare  the  principal  and  interest on the Note to be due and
payable immediately.


                                       5


                                   ARTICLE IV

                               CONVERSION OF NOTE

         Subject to and upon compliance with the provisions of this Article,  at
the option of Holder, all or any part of this Note may be converted at any time,
at the  principal  amount  hereof  together  with  accrued  and unpaid  interest
thereon,  into  fully  paid  and  nonassessable  shares  (calculated  as to each
conversion  to the nearest  1/100 of a share) of Common  Stock.  The  Conversion
Price shall initially be $4.6327 per share. Notwithstanding anything else to the
contrary set forth herein,  the Holder shall have the right to convert this Note
pursuant to the terms set forth  herein at any time,  including  the 30 Business
Days following (i) the Maturity Date or (ii) any prepayment  pursuant to Section
2.3 hereof.  If Holder  elects to convert this Note after a prepayment  has been
made  pursuant to Section  2.3,  then Holder shall return all or such portion of
the funds paid to Holder as to which Holder has elected to convert.


                                    ARTICLE V

                         ADJUSTMENT OF CONVERSION PRICE

         5.1 Anti-Dilution Provisions.  The Conversion Price shall be subject to
adjustment  from time to time as hereinafter  provided.  Upon each adjustment of
the Conversion  Price,  the holder of this Note shall  thereafter be entitled to
purchase, at the Conversion Price resulting from such adjustment,  the number of
shares of Common Stock  obtained by multiplying  the Conversion  Price in effect
immediately  prior  to such  adjustment  by the  number  of  shares  purchasable
pursuant  hereto  immediately  prior to such adjustment and dividing the product
thereof by the Conversion Price resulting from such adjustment.

         5.2      Adjustment of Conversion Price Upon Issuance of Common Stock.

                  5.2.1 (A) If and  whenever  after the date  hereof the Company
         shall  issue or sell any  Common  Stock for no  consideration  or for a
         consideration per share less than the Conversion Price then, forthwith,
         upon such issue or sale, the Conversion Price shall be reduced (but not
         increased, except as otherwise specifically provided in Section 5.2.2),
         to the price  (calculated to the nearest one-ten  thousandth of a cent)
         determined  by  dividing  (x) an  amount  equal  to the  sum of (i) the
         aggregate  number of shares of  Common  Stock  outstanding  immediately
         prior to such issue or sale multiplied by the then existing  Conversion
         Price plus (ii) the  consideration  received by the  Company  upon such
         issue or sale by (y) the  aggregate  number of  shares of Common  Stock
         outstanding immediately after such issue or sale.

                           (B)  Notwithstanding  the  provisions of this Section
         5.2, no adjustment  shall be made in the Conversion  Price in the event
         that the Company issues, in one or more transactions,  (i) Common Stock
         upon exercise of any options issued to officers, directors or employees
         of the  Company  pursuant  to a stock  option  plan  or an  employment,
         severance or  consulting  agreement  as now or hereafter in effect,  in
         each  case  approved  by the  Board  of  Directors  (provided  that the
         aggregate  number  of shares of  Common  Stock  which may be  issuable,
         including  options  issued  prior to the date  hereof,  under  all such
         employee  plans and  agreements  shall at no time  exceed the number of
         such shares of Common Stock  outstanding  on the date hereof on a fully
         diluted  basis that are issuable  under  currently  effective  employee
         plans and agreements);  (ii) Common Stock upon exercise of the Original
         Convertible  Note or this Note or any other warrant issued  pursuant to
         the terms of the Purchase Agreements;  (iii) Common Stock upon exercise
         of any  stock  purchase  warrant  or  option  (other  than the  options
         referred  to  in  clause  (i)  above)  or  other  convertible  security
         outstanding  on the  date  hereof;  or  (iv)  Common  Stock  issued  as
         consideration in acquisitions. In addition, for purposes of calculating
         any adjustment of the Conversion Price as provided in this Section 5.2,
         all of the  shares  of Common  Stock  issuable  pursuant  to any of the
         foregoing shall be assumed to be outstanding prior to the event causing
         such adjustment to be made.

                  5.2.2 For purposes of this Section 5.2, the following shall be
applicable:


                                       6



                  (A)  Issuance of Rights or Options.  In case at any time after
         the date hereof the Company shall in any manner grant (whether directly
         or by assumption in a merger or otherwise)  any rights to subscribe for
         or to purchase, or any options for the purchase of, Common Stock or any
         stock or securities  convertible  into or exchangeable for Common Stock
         (such  convertible  or  exchangeable  stock or securities  being herein
         called  "Convertible  Securities")  (other  than  warrants,  options or
         convertible  securities  issued  as  consideration  for or  assumed  in
         conjunction with an acquisition or to officers, directors, or employees
         of the acquired entity in conjunction  therewith),  whether or not such
         rights  or  options  or the  right  to  convert  or  exchange  any such
         Convertible Securities are immediately  exercisable,  and the price per
         share for which shares of Common  Stock are issuable  upon the exercise
         of such  rights or  options  or upon  conversion  or  exchange  of such
         Convertible Securities (determined by dividing (i) the total amount, if
         any,  received or  receivable by the Company as  consideration  for the
         granting of such rights or options,  plus the minimum  aggregate amount
         of additional  consideration,  if any,  payable to the Company upon the
         exercise of such rights or options, or plus, in the case of such rights
         or options that relate to Convertible Securities, the minimum aggregate
         amount of additional  consideration,  if any, payable upon the issue or
         sale of such Convertible Securities and upon the conversion or exchange
         thereof,  by (ii) the total  maximum  number of shares of Common  Stock
         issuable  upon the  exercise  of such  rights  or  options  or upon the
         conversion or exchange of all such Convertible Securities issuable upon
         the  exercise  of such  rights  or  options)  shall  be less  than  the
         Conversion  Price in effect as of the date of  granting  such rights or
         options,  then the total  maximum  number  of  shares  of Common  Stock
         issuable upon the exercise of such rights or options or upon conversion
         or  exchange  of all  such  Convertible  Securities  issuable  upon the
         exercise of such rights or options shall be deemed to be outstanding as
         of the date of the  granting of such rights or options and to have been
         issued  for such price per  share,  with the  effect on the  Conversion
         Price specified in Section 5.2.1 hereof.  Except as provided in Section
         5.2.2 hereof,  no further  adjustment of the Conversion  Price shall be
         made  upon  the  actual  issuance  of  such  Common  Stock  or of  such
         Convertible  Securities upon exercise of such rights or options or upon
         the actual issuance of such Common Stock upon conversion or exchange of
         such Convertible Securities.

                  (B)  Change  in  Option  Price or  Conversion  Rate.  Upon the
         happening of any of the following events, namely, if the purchase price
         provided for in any right or option referred to in Section 5.2.2 above,
         the additional  consideration,  if any,  payable upon the conversion or
         exchange of any Convertible  Securities referred to in Section 5.2.2(A)
         hereof, or the rate at which any Convertible  Securities referred to in
         Section  5.2.2(A)  hereof,  are convertible  into or  exchangeable  for
         Common Stock shall change  (other than under or by reason of provisions
         designed to protect  against  dilution),  the Conversion  Price then in
         effect hereunder shall forthwith be readjusted (increased or decreased,
         as the case may be) to the  Conversion  Price  that  would have been in
         effect at such time had such rights,  options or Convertible Securities
         still outstanding provided for such changed purchase price,  additional
         consideration  or  conversion  rate,  as the case  may be,  at the time
         initially granted, issued or sold. On the expiration of any such option
         or right referred to in Section 5.2.2(A) hereof,  or on the termination
         of  any  such  right  to  convert  or  exchange  any  such  Convertible
         Securities referred to in Section 5.2.2(A) hereof, the Conversion Price
         then in effect  hereunder shall  forthwith be readjusted  (increased or
         decreased,  as the case may be) to the Conversion Price that would have
         been in effect at the time of such  expiration or termination  had such
         right,  option or  Convertible  Securities,  to the extent  outstanding
         immediately  prior  to  such  expiration  or  termination,  never  been
         granted, issued or sold, and the Common Stock issuable thereunder shall
         no longer be deemed to be  outstanding.  If the purchase price provided
         for in  Section  5.2.2(A)  hereof or the rate at which any  Convertible
         Securities  referred to in Section 5.2.2(A) hereof are convertible into
         or exchangeable  for Common Stock shall be reduced at any time under or
         by reason of  provisions  with  respect  thereto  designed  to  protect
         against dilution, then in case of the delivery of Common Stock upon the
         exercise of any such right or option or upon  conversion or exchange of
         any such  Convertible  Securities,  the Conversion Price then in effect
         hereunder shall, if not already adjusted, forthwith be adjusted to such
         amount as would have  obtained  had such right,  option or  Convertible
         Securities   never  been  issued  as  to  such  Common  Stock  and  had
         adjustments  been made upon the issuance of the Common Stock  delivered
         as aforesaid, but only if as a result of such adjustment the Conversion
         Price then in effect hereunder is thereby reduced.


                                       7



                  (C)  Consideration for Stock. In case at any time Common Stock
         or Convertible Securities or any rights or options to purchase any such
         Common  Stock or  Convertible  Securities  shall be  issued or sold for
         cash,  the  consideration  therefor  shall be deemed  to be the  amount
         received by the Company therefor. In case at any time any Common Stock,
         Convertible  Securities  or any rights or options to purchase  any such
         Common  Stock or  Convertible  Securities  shall be  issued or sold for
         consideration  other than cash, the amount of the  consideration  other
         than cash  received by the Company shall be deemed to be the fair value
         of such  consideration,  as determined  reasonably and in good faith by
         the Board of Directors  of the Company.  In case at any time any Common
         Stock,  Convertible Securities or any rights or options to purchase any
         Common Stock or  Convertible  Securities  shall be issued in connection
         with any merger or  consolidation in which the Company is the surviving
         corporation,  the amount of  consideration  received  therefor shall be
         deemed to be the fair value, as determined reasonably and in good faith
         by the Board of Directors of the Company, of such portion of the assets
         and business of the nonsurviving corporation as such Board of Directors
         may  determine to be  attributable  to such Common  Stock,  Convertible
         Securities,  rights or  options as the case may be. In case at any time
         any  rights or  options  to  purchase  any  shares  of Common  Stock or
         Convertible  Securities shall be issued in connection with the issuance
         and sale of other securities of the Company, together consisting of one
         integral  transaction  in which no  consideration  is allocated to such
         rights or  options by the  parties,  such  rights or  options  shall be
         deemed to have been issued without consideration.

                  (D) Record Date.  In the case the Company  shall take a record
         of the holders of its Common  Stock for the purpose of  entitling  them
         (i) to receive a dividend or other distribution payable in Common Stock
         or Convertible Securities,  or (ii) to subscribe for or purchase Common
         Stock or Convertible Securities,  then such record date shall be deemed
         to be  the  date  of the  issuance  or  sale  of the  Common  Stock  or
         Convertible  Securities  deemed to have been issued or sold as a result
         of the  declaration  of such  dividend  or the  making  of  such  other
         distribution  or the date of the granting of such right of subscription
         or purchase, as the case may be.

                  (E)  Treasury  Shares.  The  number of shares of Common  Stock
         outstanding  at any given time shall not include  shares owned directly
         by the  Company in  treasury,  and the  disposition  of any such shares
         shall be considered an issuance or sale of Common Stock for the purpose
         of this Section 5.2.

         5.3 Stock  Dividends.  In case the Company  shall declare a dividend or
make any other  distribution  upon any shares of the Company,  payable in Common
Stock or Convertible Securities,  any Common Stock or Convertible Securities, as
the case may be, issuable in payment of such dividend or  distribution  shall be
deemed to have been issued or sold without consideration.

         5.4 Stock  Splits and  Reverse  Splits.  In the event that the  Company
shall at any time  subdivide  its  outstanding  shares  of Common  Stock  into a
greater number of shares,  the Conversion Price in effect  immediately  prior to
such subdivision shall be proportionately  reduced and the number of Shares into
which this Note may be converted  immediately prior to such subdivision shall be
proportionately  increased,  and  conversely,  in the event that the outstanding
shares of Common  Stock shall at any time be combined  into a smaller  number of
shares,  the Conversion  Price in effect  immediately  prior to such combination
shall be proportionately increased and the number of Shares into which this Note
may be converted  immediately prior to such combination shall be proportionately
reduced.  Except as provided in this Section 5.4 no adjustment in the Conversion
Price and no change in the number of Shares  shall be made under this  Article V
as a result of or by reason of any such subdivision or combination.


                                       8



         5.5 Reorganizations  and Asset Sales. If any capital  reorganization or
reclassification  of the capital  stock of the  Company,  or any  consolidation,
merger or share  exchange  of the  Company  with  another  Person,  or the sale,
transfer  or other  disposition  of all or  substantially  all of its  assets to
another  Person  shall be  effected in such a way that  holders of Common  Stock
shall be entitled to receive capital stock, securities or assets with respect to
or in exchange for their shares, then the following provisions shall apply:

                  5.5.1 As a condition of such reorganization, reclassification,
consolidation,  merger,  share  exchange,  sale,  transfer or other  disposition
(except as  otherwise  provided  below in Section  5.5.3),  lawful and  adequate
provisions  shall be made whereby the holder of this Note shall  thereafter have
the right to purchase  and receive  upon the terms and  conditions  specified in
this Note and in lieu of the shares immediately  theretofore receivable upon the
exercise  of the  rights  represented  hereby,  such  shares of  capital  stock,
securities  or assets as may be issued or payable with respect to or in exchange
for a number of  outstanding  shares of such Common Stock equal to the number of
shares   immediately   theretofore  so  receivable   had  such   reorganization,
reclassification, consolidation, merger, share exchange or sale not taken place,
and in any such  case  appropriate  provision  reasonably  satisfactory  to such
holder shall be made with respect to the rights and  interests of such holder to
the end that the provisions hereof (including,  without  limitation,  provisions
for adjustments of the Conversion  Price and of the number of shares  receivable
upon the exercise)  shall  thereafter be applicable,  as nearly as possible,  in
relation  to any  shares of  capital  stock,  securities  or  assets  thereafter
deliverable upon the exercise of this Note.

                  5.5.2  In  the  event  of  a   merger,   share   exchange   or
consolidation  of the Company with or into another Person as a result of which a
number of  shares of common  stock or its  equivalent  of the  successor  Person
greater  or  lesser  than the  number of  shares  of  Common  Stock  outstanding
immediately  prior to such merger,  share exchange or consolidation are issuable
to holders of Common  Stock,  then the  Conversion  Price in effect  immediately
prior to such merger,  share exchange or consolidation  shall be adjusted in the
same manner as though there were a subdivision or combination of the outstanding
shares of Common Stock.

                  5.5.3 The  Company  shall not effect  any such  consolidation,
merger,  share exchange,  sale, transfer or other disposition unless prior to or
simultaneously with the consummation thereof the successor Person (if other than
the Company) resulting from such consolidation,  share exchange or merger or the
Person  purchasing  or  otherwise  acquiring  such assets  shall have assumed by
written instrument  executed and mailed or delivered to the Holder hereof at the
last address of such Holder appearing on the books of the Company the obligation
to deliver to such Holder such shares of capital stock, securities or assets as,
in  accordance  with the  foregoing  provisions,  such Holder may be entitled to
receive,  and all other  liabilities and  obligations of the Company  hereunder.
Upon written  request by the Holder hereof,  such Successor  Person will issue a
new Note revised to reflect the  modifications in this Note effected pursuant to
this Section 5.5.

                  5.5.4 If a purchase,  tender or exchange  offer is made to and
accepted  by the  holders  of 50% or more of the  outstanding  shares  of Common
Stock, the Company shall not effect any consolidation, merger, share exchange or
sale, transfer or other disposition of all or substantially all of the Company's
assets  with the Person  having  made such offer or with any  affiliate  of such
Person,  unless prior to the consummation of such consolidation,  merger,  share
exchange,  sale, transfer or other disposition the holder hereof shall have been
given a reasonable  opportunity  to then elect to receive upon the conversion of
this Note either the capital  stock,  securities  or assets then  issuable  with
respect to the Common Stock or the capital stock,  securities or assets,  or the
equivalent,  issued to previous  holders of the Common Stock in accordance  with
such offer.


                                       9



         5.6  Adjustment  for Asset  Distribution.  If the  Company  declares  a
dividend or other distribution  payable to all holders of shares of Common Stock
in  evidences  of  indebtedness  of the  Company or other  assets of the Company
(including,  cash (other than  regular cash  dividends  declared by the Board of
Directors),  capital stock (other than Common Stock,  Convertible  Securities or
options or rights thereto) or other  property),  the Conversion  Price in effect
immediately  prior to such  declaration  of such dividend or other  distribution
shall  be  reduced  by an  amount  equal  to the  amount  of  such  dividend  or
distribution  payable per share of Common Stock,  in the case of a cash dividend
or distribution, or by the fair value of such dividend or distribution per share
of  Common  Stock  (as  reasonably  determined  in good  faith  by the  Board of
Directors of the Company),  in the case of any other  dividend or  distribution.
Such reduction  shall be made whenever any such dividend or distribution is made
and shall be  effective as of the date as of which a record is taken for purpose
of such dividend or  distribution  or, if a record is not taken,  the date as of
which  holders  of  record  of  Common  Stock   entitled  to  such  dividend  or
distribution are determined.

         5.7 De Minimis  Adjustments.  No  adjustment in the number of shares of
Common Stock  purchasable  hereunder  shall be required  unless such  adjustment
would  require an increase  or  decrease  of at least one share of Common  Stock
purchasable  upon  conversion of the Note and no  adjustment  in the  Conversion
Price shall be  required  unless such  adjustment  would  require an increase or
decrease of at least $.01 in the Conversion Price;  provided,  however, that any
adjustments  which by reason of this  Section  5.7 are not  required  to be made
shall be carried  forward and taken into account in any  subsequent  adjustment.
All  calculations  shall  be made to the  nearest  full  share  or  nearest  one
hundredth of a dollar, as applicable.

         5.8 Notice of Adjustment.  Whenever the Conversion  Price or the number
of Shares  issuable upon the  conversion of the Note shall be adjusted as herein
provided,  or the rights of the holder  hereof  shall  change by reason of other
events specified herein, the Company shall compute the adjusted Conversion Price
and the adjusted number of Shares in accordance  with the provisions  hereof and
shall prepare an Officer's  Certificate  setting  forth the adjusted  Conversion
Price and the adjusted  number of Shares  issuable  upon the  conversion of this
Note or specifying the other shares of stock, securities or assets receivable as
a result of such change in rights,  and showing in  reasonable  detail the facts
and  calculations  upon which such  adjustments or other changes are based.  The
Company shall cause to be mailed to the Holder  hereof copies of such  Officer's
Certificate  together with a notice  stating that the  Conversion  Price and the
number of Shares purchasable upon conversion of this Note have been adjusted and
setting forth the adjusted  Conversion  Price and the adjusted  number of Shares
purchasable upon conversion of this Note.

         5.9 Notifications to Holders. In case at any time the Company proposes:

                           (i) to declare  any  dividend  upon its Common  Stock
                  payable in capital stock or make any special dividend or other
                  distribution (other than cash dividends) to the holders of its
                  Common Stock;

                           (ii) to offer for subscription pro rata to all of the
                  holders of its Common Stock any  additional  shares of capital
                  stock of any class or other rights;

                           (iii)  to  effect  any  capital  reorganization,   or
                  reclassification  of the  capital  stock  of the  Company,  or
                  consolidation,  merger or share  exchange of the Company  with
                  another Person, or sale,  transfer or other disposition of all
                  or substantially all of its assets; or

                           (iv)   to   effect   a   voluntary   or   involuntary
                  dissolution, liquidation or winding up of the Company,


                                      10



then, in any one or more of such cases, the Company shall give the holder hereof
(a) at least 10 days (but not more  than 90 days)  prior  written  notice of the
date on which the books of the Company  shall  close or a record  shall be taken
for such dividend, distribution or subscription rights or for determining rights
to vote in  respect  of any  such  issuance,  reorganization,  reclassification,
consolidation, merger, share exchange, sale, transfer, disposition, dissolution,
liquidation  or  winding  up,  and  (b)  in  the  case  of  any  such  issuance,
reorganization,  reclassification,  consolidation, merger, share exchange, sale,
transfer, disposition,  dissolution, liquidation or winding up, at least 10 days
(but not more than 90 days) prior written notice of the date when the same shall
take place.  Such notice in accordance with the foregoing  clause (a) shall also
specify, in the case of any such dividend,  distribution or subscription rights,
the date on which the holders of Common  Stock shall be  entitled  thereto,  and
such notice in accordance  with the foregoing  clause (b) shall also specify the
date on which the holders of Common  Stock  shall be entitled to exchange  their
Common Stock,  as the case may be, for securities or other property  deliverable
upon  such  reorganization,   reclassification,   consolidation,  merger,  share
exchange, sale, transfer, disposition,  dissolution,  liquidation or winding up,
as the case may be.

         5.10 Company to Prevent  Dilution.  If any event or condition occurs as
to which other  provisions  of this  Article are not strictly  applicable  or if
strictly  applicable would not fairly protect the exercise or purchase rights of
this  Note  evidenced  hereby  in  accordance  with  the  essential  intent  and
principles of such provisions, or that might materially and adversely affect the
exercise or purchase  rights of the holder  hereof under any  provisions of this
Note,  then the Company shall make such  adjustments in the  application of such
provisions,  in accordance with such essential  intent and principles,  so as to
protect such  exercise and purchase  rights as  aforesaid,  and any  adjustments
necessary  with  respect  to the  Conversion  Price  and the  number  of  shares
purchasable  hereunder so as to preserve the rights of the holder hereunder.  In
no event shall any such  adjustment have the effect of increasing the Conversion
Price as otherwise  determined pursuant to this Article except in the event of a
combination of shares of the type  contemplated in Section 5.4 hereof,  and then
in no event to an amount greater than the Conversion Price as adjusted  pursuant
to Section 5.4 hereof.

                                   ARTICLE VI

                                    COVENANTS

         The  Company  covenants  and  agrees  that,  so long  as  this  Note is
outstanding:

         6.1 Payment of Principal  and Accrued  Interest.  The Company will duly
and punctually pay or cause to be paid the principal sum of this Note,  together
with interest  accrued  thereon from the date hereof to the date of payment,  in
accordance with the terms hereof.

         6.2  Corporate  Existence.  The  Company  will,  and  will  cause  each
Subsidiary to, do or cause to be done all things  necessary to preserve and keep
in full force and effect its corporate existence, rights (charter and statutory)
and franchises; provided, however, that the Company or a Subsidiary shall not be
required  to  preserve  any such  right  or  franchise  if it  shall  reasonably
determine that the preservation thereof is no longer desirable in the conduct of
its business.

         6.3  Taxes;  Claims;  etc.  The  Company  will,  and  will  cause  each
Subsidiary  to,  promptly pay and discharge all lawful taxes,  assessments,  and
governmental charges or levies imposed upon it or upon its income or profits, or
upon any of its  properties,  real,  personal,  or mixed,  before the same shall
become in  default,  as well as all  lawful  claims for  labor,  materials,  and
supplies or otherwise which, if unpaid,  might become a lien or charge upon such
properties  or any part  thereof,  and which lien or charge will have a material
adverse effect on the business of the Company;  provided,  however, that neither
the Company nor any Subsidiary  shall be required to pay or cause to be paid any
such tax, assessment, charge, levy, or claim prior to institution of foreclosure
proceedings  if the validity  thereof  shall  concurrently  be contested in good
faith by  appropriate  proceedings  and if the  Company  shall have  established
reserves  deemed by the Company  adequate with respect to such tax,  assessment,
charge, levy, or claim.


                                       11



         6.4 Maintenance of Existence and Properties. The Company will, and will
cause each Subsidiary to, keep its material  properties in good repair,  working
order,  and  condition,  ordinary wear and tear  excepted,  so that the business
carried on may be properly  conducted  at all times in  accordance  with prudent
business management.

         6.5 SEC Reports.  The Company will deliver to the Holder within 20 days
after it files them with the SEC, copies of its annual and quarterly reports and
of the information,  documents, and other reports (or copies of such portions of
any of the foregoing as the SEC may by rules and  regulations  prescribe)  which
the Company is required or elects to file with the SEC pursuant to Section 13 or
15(d) of the  Securities  Exchange Act of 1934.  The Company will timely  comply
with  its  reporting  and  filing   obligations  under  the  applicable  federal
securities laws.

         6.6 Notice of Defaults.  The Company will promptly notify the Holder in
writing of the  occurrence of (i) any Event of Default under this Note, and (ii)
any event of default (or if any event of default  would  result upon any payment
with  respect to this Note) with  respect to any  Indebtedness  as such event of
default is defined  therein or in the instrument  under which it is outstanding,
permitting holders to accelerate the maturity of such Indebtedness.

         6.7  Compliance  with Laws.  The Company will promptly  comply with all
laws,  ordinances and governmental rules and regulations to which it is subject,
the violation of which would materially and adversely affect the Company.

         6.8  Amendments  to Charter.  The Company  will not amend or modify its
charter without the prior written consent of Holder.

         6.9 Mergers and  Acquisitions.  Without the consent of the Holder,  the
Company or any Subsidiary will not dissolve,  liquidate,  consolidate,  merge or
enter  into a share  exchange  with or sell  or  transfer  all or a  substantial
portion of its assets to any Person.


                                       12



         6.10  Election of  Director.  The Company  will use its best efforts to
cause the  election,  at all  shareholders'  meetings  called for the purpose of
electing  directors  of the Company or in any other  action  taken to elect such
directors,  of one person  designated  by Holder as a nominee  (the  "Designated
Director"). If a vacant directorship arises due to the resignation or disability
of the Designated  Director,  or if the  Designated  Director is removed for any
reason,  the  Company  will use its best  efforts  to cause the  appointment  of
another person designated by Holder to replace the Designated Director.


                                   ARTICLE VII

                                  MISCELLANEOUS

         7.1 Consent to  Amendments.  This Note may be amended,  and the Company
may take  any  action  herein  prohibited,  or omit to  perform  any act  herein
required  to be  performed  by it, if and only if the Company  shall  obtain the
written consent to such amendment, action or omission to act from the holders of
a majority of the aggregate principal amount of this Note.

         7.2  Benefits  of Note;  No  Impairment  of  Rights of Holder of Senior
Indebtedness.  Nothing  in this  Note,  express  or  implied,  shall give to any
Person, other than the Company,  Holder, and their successors any benefit or any
legal or equitable right, remedy or claim under or in respect of this Note.

         7.3 Successors  and Assigns.  All covenants and agreements in this Note
contained  by or on behalf of the Company and the Holder shall bind and inure to
the  benefit of the  respective  successors  and  assigns of the Company and the
Holder.

         7.4  Restrictions  on Transfer.  Holder  shall not  transfer  this Note
except  (by the grant of a  security  interest)  to its  lender or  lenders.  As
between Holder and its lender or lenders,  this Note is transferable in the same
manner  and with  the same  effect  as in the  case of a  negotiable  instrument
payable to a  specified  person.  Any lender to which  Holder  grants a security
interest in this Note shall be entitled to exercise  all remedies to which it is
entitled by contract or by law, including (without limitation) transferring this
Note into its own name or into the name of any purchaser at any sale  undertaken
in connection with enforcement by such lender of its remedies.

         7.5  Notice;  Address of Parties.  Except as  otherwise  provided,  all
communications to the Company or Holder provided for herein or with reference to
this Note  shall be deemed to have  been  sufficiently  given or served  for all
purposes on the third  business day after being sent as certified or  registered
mail,  postage  and  charges  prepaid,  to the  following  addresses:  if to the
Company:  Black  Warrior  Wireline  Corp.,  3748  Highway  #45 North,  Columbus,
Mississippi  39701, or at any other address designated by the Company in writing
to Holder; if to Holder:  St. James Capital Partners,  L.P., _ St. James Capital
Corp., 1980 Post Oak Boulevard,  Suite 2030, Houston, Texas 77056, Attn: John L.
Thompson,  or at any  other  address  designated  by Holder  to the  Company  in
writing.

         7.6  Separability  Clause.  In case any provision in this Note shall be
invalid,  illegal or unenforceable in any jurisdiction,  the validity,  legality
and enforceability of the remaining provisions in such jurisdiction shall not in
any way be affected or impaired thereby;  provided,  however,  such construction
does not destroy the essence of the bargain provided for hereunder.

         7.7  Governing  Law.  This Note shall be governed by, and  construed in
accordance  with, the internal laws of the State of Delaware  (without regard to
principles of choice of law).


                                       13



         7.8  Usury.  It is the  intention  of the  parties  hereto  to  conform
strictly to the  applicable  laws of the State of Delaware and the United States
of America,  and judicial or  administrative  interpretations  or determinations
thereof  regarding the contracting  for,  charging and receiving of interest for
the use,  forbearance,  and detention of money (hereinafter  referred to in this
Section 7.9 as "Applicable  Law").  The Holder shall have no right to claim,  to
charge or to receive any interest in excess of the maximum rate of interest,  if
any,  permitted  to be  charged  on  that  portion  of the  amount  representing
principal  which is outstanding  and unpaid from time to time by Applicable Law.
Determination  of the rate of interest  for the purpose of  determining  whether
this  Note is  usurious  under  Applicable  Law  shall  be  made by  amortizing,
prorating,  allocating  and  spreading  in equal parts  during the period of the
actual  time of this Note,  all  interest  or other sums  deemed to be  interest
(hereinafter  referred  to in  this  Section  7.9 as  "Interest")  at  any  time
contracted  for,  charged or received from the Company in  connection  with this
Note. Any Interest  contracted for, charged or received in excess of the maximum
rate allowed by Applicable Law shall be deemed a result of a mathematical  error
and a mistake.  If this Note is paid in part prior to the end of the full stated
term of this Note and the Interest  received for the actual  period of existence
of this Note exceeds the maximum rate allowed by  Applicable  Law,  Holder shall
credit the amount of the excess  against any amount owing under this Note or, if
this Note has been paid in full,  or in the event  that it has been  accelerated
prior to maturity, Holder shall refund to the Company the amount of such excess,
and shall not be subject to any of the penalties  provided by Applicable Law for
contracting  for,  charging or receiving  Interest in excess of the maximum rate
allowed by Applicable Law. Any such excess which is unpaid shall be canceled.





         IN WITNESS  WHEREOF,  the Company has caused this instrument to be duly
executed on the date first above written.



                                        BLACK WARRIOR WIRELINE CORP.



                                        By:
                                              William L. Jenkins, President