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                                                                   EXHIBIT 10.4
                           CONVERTIBLE LOAN AGREEMENT

     THIS CONVERTIBLE LOAN AGREEMENT is made and entered into as of October 16,
1997, by and between Flotek Industries Inc., an Alberta corporation, whose
principal executive offices are located at 7030 Empire Central Drive, Houston,
Texas 77040 (the "Borrower") and TOSI, L. P., a Texas limited partnership, whose
principal executive offices are located at 3900 Thanksgiving Tower, 1601 Elm
Street, Dallas, Texas 75201 (the "Lender").

     In consideration of the mutual covenants and agreements herein contained
and of the loan hereinafter referred to, the Borrower and the Lender hereby
agree as follows:

                                    ARTICLE 1

                                  GENERAL TERMS

     Section 1.01 Certain Definitions. As used in this Agreement, the following
terms shall have the meanings respectively ascribed to them below unless the
context clearly requires otherwise:

             "Agreement" shall mean this Convertible Loan Agreement, as the same
     may from time to time be amended or supplemented.

             "Ancillary Documents" shall mean collectively the Security
     Instruments, the Guaranties and the Registration Rights Agreement.

             "Balance Sheet" shall mean the audited consolidated balance sheet
     of the Borrower and its Subsidiaries for the Borrower's fiscal year ended
     February 28, 1997.

             "Business Day" shall mean any day other than a Saturday, Sunday or
     day on which commercial banks are authorized or required to be closed under
     the laws of the State of Texas.

             "Commission" shall mean the United States Securities and Exchange
     Commission.

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

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

             "Event of Default" shall mean the occurrence of any of the events
     specified in Section 6.01 hereof, provided that any requirement for notice
     or lapse of time or any other condition precedent has been satisfied.

             "Excepted Liens" shall mean: (i) Liens for taxes, assessments or
     other governmental charges or levies not yet due and payable or that are
     being diligently contested in good faith by





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     appropriate action by or on behalf of the Borrower or any Subsidiary and
     for which adequate reserves have been established; (ii) Liens in connection
     with worker's compensation, unemployment insurance or other
     social-security, old-age-pension or public-liability obligations; (iii)
     legal or equitable encumbrances deemed to exist by reason of negative
     pledge covenants and other covenants or undertakings of like nature; (iv)
     legal or equitable encumbrances deemed to exist by reason of the existence
     of any litigation or other legal proceeding or arising out of a judgment or
     award with respect to which an appeal is being diligently prosecuted in
     good faith by appropriate action; (v) vendors', carriers', warehousemen's,
     repairmen's, mechanics, workers', materialmen's, construction or other like
     Liens arising by operation of law in the ordinary course of business or
     incident to the construction or improvement of any Property in respect of
     obligations that are not yet due and payable or that are being diligently
     contested in good faith by appropriate proceedings by or on behalf of the
     Borrower or any Subsidiary and for which adequate reserves have been
     established; and (vi) servitudes, easements, restrictions, rights of way
     and other similar rights in real or immovable Property or any interests
     therein that, in each case, do not materially impair the use of such
     Property for the purposes for which it is held by the Borrower or any
     Subsidiary.

             "Existing Security Agreement" shall mean that certain Security
     Agreement dated September 18, 1997 between the Borrower and the Lender
     pursuant to which the Borrower granted first priority security interest in
     the collateral specified therein as security for the Existing TOSI Loan.

             "Existing TOSI Loan" shall mean all indebtedness and obligations of
     the Borrower to the Lender pursuant to the loan evidenced by that certain
     promissory note dated September 18, 1997 in the original principal amount
     of US$293,000.00 made by the Borrower in favor of the Lender and secured
     pursuant to the Existing Security Agreement.

             "Expenses" shall include, without limitation, any and all court
     costs, attorneys' fees (including, without limitation, for trial, appeal or
     other proceedings), fees of auditors and accountants and investigation and
     pre-litigation expenses that the Lender may incur, directly or indirectly,
     together with interest at the post-maturity rate specified in the Note on
     each such amount from the date of written demand or request by the Lender
     for reimbursement until the date of reimbursement to the Lender.

             "Financial Statements" shall mean the audited consolidated annual
     financial statements of the Borrower and its Subsidiaries for the
     Borrower's fiscal year ended February 28, 1997, and the unaudited
     consolidated interim financial statements of the Borrower and its
     Subsidiaries for the Borrower's fiscal quarter ended August 31, 1997
     (including all related schedules and notes thereto).

             "GAAP" shall mean United States generally-accepted accounting
     principles.

             "Governmental Requirement" shall mean any law, statute, code,
     ordinance, order, rule, regulation, judgment, decree, injunction,
     franchise, permit, certificate, license, authorization or

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     other direction or requirement (including, without limitation, any of the
     foregoing which relate to environmental standards or controls, energy
     regulations and occupational, safety and health standards or controls) of
     any (domestic or foreign) federal, state, county, municipal or other
     government, department, commission, board, court, agency or any other
     instrumentality of any of them, which exercises jurisdiction over the
     Borrower or any of its Property or of any Subsidiary or any of such
     Subsidiary's Property.

             "Guaranty" shall mean each and every guaranty instrument or
     agreement executed and delivered to the Lender by any Subsidiary to secure
     any Indebtedness.

             "Indebtedness" shall, mean any and all amounts owing or to be owing
     by the Borrower to the Lender in connection with this Agreement, the Note
     and any Security Instruments, whether principal, interest or otherwise, and
     all other liabilities and obligations of the Borrower to the Lender from
     time to time existing, whether in connection with this or any other
     transaction.

             "Judgment" shall have the meaning ascribed to it in Borrower's
     promissory note evidencing the Existing TOSI Loan.

             "Lien" shall mean any security agreement, financing statement filed
     with an appropriate governmental authority, conditional sale or other title
     retention agreement, lease, consignment or bailment given for security
     purposes, lien, mortgage, pledge, option, preemptive right (whether
     contractual or statutory), right of first refusal, encumbrance, adverse
     interest, constructive trust or other trust, claim, attachment, exception
     to or defect in title or other ownership interest (including, without
     limitation, reservations, rights of entry, possibilities of reverter,
     encroachments, easements, rights of way, restrictive covenants, leases and
     licenses) of any kind, that (i) creates or confers an interest in property
     to secure payment or performance of a liability, obligation or claim, or
     that retains or reserves such an interest for such purpose; (ii) grants to
     any Person the right to purchase or otherwise acquire, or obligates any
     Person to sell or otherwise dispose of, or otherwise results or may result
     in any Person acquiring, any property or interest therein; (iii) restricts
     the transfer of, or the exercise of any rights or the enjoyment of any
     benefits arising by reason of ownership of, any property; or (iv) otherwise
     constitutes an interest in or claim against property arising pursuant to
     common law or to any law, statute, contract, judgment, order or decree.

             "Loan" shall mean the US$750,000.00 loan made by the Lender to the
     Borrower pursuant to this Agreement and the Note.

             "Material Adverse Effect" shall mean any material and adverse
     effect on (i) the assets, liabilities, financial condition, business,
     operations, affairs or circumstances of the Borrower or any Subsidiary
     individually or of the Borrower and its Subsidiaries on a consolidated
     basis from those reflected in the Financial Statements or from the facts
     represented or warranted in this Agreement or any Security Instrument, or
     (ii) the ability of the Borrower or any Subsidiary individually or of the
     Borrower and its Subsidiaries on a consolidated basis to carry out its
     business as at the date of this Agreement or as proposed at the date of
     this Agreement to be


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     conducted or meet its obligations under this Agreement, the Note and the
     Security Instruments on a timely basis.

             "Note" shall mean the convertible promissory note made by the
     Borrower in favor of the Lender in the form attached as Exhibit 1.01
     hereto, together with any and all renewals, extensions for any period,
     increases or rearrangements thereof.

             "Person" shall mean any individual, corporation, partnership,
     limited partnership, limited liability company, joint venture, joint stock
     company, association, trust, unincorporated organization, or federal, state
     or local government (domestic or foreign) or any agency or political
     subdivision thereof, or any other form of entity.

             "Plan" shall mean any plan subject to Title IV of ERISA and
     maintained by the Borrower or any Subsidiary, or any such plan to which the
     Borrower or any Subsidiary is required to contribute on behalf of its
     employees.

             "Potential Default" shall mean the occurrence of any of the events
     specified in Section 6.01 hereof, whether or not any requirement for notice
     or lapse of time or other condition precedent has been satisfied.

             "Private Placement" shall mean the Borrower's private placement of
     11,666,667 units (each consisting of one common share and one warrant
     exercisable to purchase one additional common share) for an aggregate of
     US$1,250,000.00 that the Borrower announced on September 14, 1997.

             "Property" shall mean any interest in any kind of property or
     asset, whether real, personal or mixed, tangible or intangible.

             "Registration Rights Agreement" shall mean that certain
     registration rights agreement of even date herewith by and among, inter
     alia, the Lender and the Borrower that provides registration rights for the
     Shares issuable upon conversion of the principal amount of the Loan and
     upon exercise of the Warrant.

             "Security Instruments" shall mean collectively the Existing
     Security Agreement and any and all other agreements or instruments now or
     hereafter executed and delivered by the Borrower, any Subsidiary or any
     other Person in connection with, or as security for the payment or
     performance of, any Indebtedness (including, without limitation, the
     Existing TOSI Loan, the Note or this Agreement and any and all financing,
     continuation and termination statements related thereto), as such
     agreements may be amended or supplemented from time to time.

             "Shareholder Protection Rights Plan" shall mean the shareholder
     protection rights plan evidenced by that certain Shareholder Protection
     Rights Plan dated as of July 28, 1993 between              the Borrower 
     and Pacific Corporate Trust Company, as Rights Agent.


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             "Shares" shall mean the Borrower's common shares.

             "Subsidiary" shall mean any Person of which more than fifty percent
     (50%) of the issued and outstanding securities having ordinary voting power
     for the election of directors or others with analogous power and authority
     is owned or controlled, directly or indirectly, by the Borrower and/or one
     or more of its subsidiaries.

             "VSE" shall mean the Vancouver Stock Exchange.

             "Warrant" shall mean that certain Warrant of even date herewith
     pursuant to which the Borrower has granted to the Lender the right to
     purchase up to 7,000,000 shares of the Borrower's common shares on the
     terms and conditions set forth therein.

     Section 1.02 Accounting Principles. Any and all determinations of the
character or amount of any asset or liability or item of income or expense
required to be determined or any consolidation or other accounting computation
required to be made under this Agreement shall be made in accordance with GAAP
applied on a basis consistent with the Financial Statements, except to the
extent that such principles are inconsistent with the requirements of this
Agreement. All determinations of financial amounts on the consolidated basis of
the Borrower and its Subsidiaries shall make due allowance for any minority
stock interest in such Subsidiaries.

     Section 1.03 Currency. Except where a reference to Canadian currency is
indicated by the use "CDN," all currency references in this Agreement are
references to the lawful moneys of the United States of America and where, for
any purpose in connection with the Loan, it is necessary to refer to the lawful
moneys of Canada, a deemed exchange rate of CDN$1.40 per US$1.00 shall apply so
that, for example, the original principal amount of the Loan expressed in
Canadian funds is CDN$1,050,000.00.

                                    ARTICLE 2

                            AMOUNT AND TERMS OF LOAN

     Section 2.01 Term Loan. Subject to the terms and conditions and relying on
the representations and warranties contained in this Agreement, the Lender
agrees to make, on the date hereof, the Loan, which shall be evidenced by the
Borrower's issuance, execution and delivery of the Note.

     Section 2.02 Payment Procedures. All payments and prepayments made by the
Borrower under the Note or this Agreement shall be made to the Lender at its
principal executive offices in immediately available funds before 5:00 p.m.,
Dallas, Texas time, on the date that such payment is required to be made. Any
payment received and accepted by the Lender after such time shall be considered
for all purposes (including the calculation in interest, to the extent permitted
by law) as having been made on the Lender's next following Business Day.

     Section 2.03 Business Day. If the date for any Loan payment or prepayment
hereunder falls on a day that is not a Business Day, then for all purposes of
the Note and this Agreement the same shall be

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deemed to have fallen on the next following Business Day, and such extension of
time shall in such case be included in the computation of payments of interest.

     Section 2.04 Conversion of Loan Principal. The principal amount of the Loan
shall be convertible into the common shares of the Borrower on the terms and
conditions set forth in Schedule 2.04 hereto.

                                    ARTICLE 3

                         REPRESENTATIONS AND WARRANTIES

     To induce the Lender to enter into this Agreement, the Borrower represents
and warrants to the Lender (with each such representation and warranty's being
deemed material and relied upon by the Lender irrespective of whether such
materiality and/or reliance actually exists) as follows:

     Section 3.01 Corporate Existence. Each of the Borrower and each Subsidiary
is a corporation duly organized, validly existing and in good standing under the
laws of its jurisdiction of incorporation and is duly qualified to transact
business as a foreign corporation in all jurisdictions in which the Property
owned or leased, or the business transacted by, it makes such qualification
necessary or desirable.

     Section 3.02 Corporate Power and Authorization. The Borrower is duly
authorized and empowered to create and issue the Note and the Warrant, to
execute, deliver and perform its obligations under this Agreement, and to
execute, deliver and perform its obligations under the Ancillary Documents to
which it is a party. Each Subsidiary is duly authorized and empowered to
execute, deliver and perform its obligations under the Ancillary Documents to
which it is a party. All corporate action on the Borrower's part necessary for
the due creation and issuance of the Note and the Warrant and for the due
execution, delivery and performance of this Agreement and of the Ancillary
Documents has been duly and effectively taken. All corporate action on each
Subsidiary's part necessary for the due execution, delivery and performance of
the Ancillary Documents to which it is a party has been duly and effectively
taken.

     Section 3.03 Binding Obligations. This Agreement, the Note, the Warrant and
the Ancillary Documents to which the Borrower is a party constitute valid and
binding obligations of the Borrower, enforceable against the Borrower in
accordance with their respective terms (except to the extent that enforcement
may be subject to any applicable bankruptcy, insolvency or similar laws of
general application affecting the enforcement of creditors' rights). Each
Ancillary Document to a Subsidiary is a party constitutes the valid and binding
obligations of such Subsidiary, enforceable against such Subsidiary in
accordance with its terms (except to the extent that enforcement may be subject
to any applicable bankruptcy, insolvency or similar laws of general application
affecting the enforcement of creditors' rights).

     Section 3.04 No Legal Bar or Resultant Lien. The Borrower's execution,
delivery and performance of the Note, the Warrant, this Agreement and the
Ancillary Documents to which the Borrower is a party does not and shall not
violate any provisions of its articles or certificate of incorporation or
charter, bylaws or any contract, agreement, instrument or Governmental
Requirement to which the Borrower is subject


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(other than any Governmental Requirement the violation of which, either
individually or in the aggregate, would not have a Material Adverse Effect), or
result in the creation or imposition of, or obligation to create, any Lien upon
any Property of the Borrower, other than any Lien permitted by this Agreement.
Each Subsidiary's execution, delivery and performance of the Ancillary Documents
to which it is a party does not and shall not violate any provisions of such
Subsidiary's articles or certificate of incorporation or charter, bylaws or any
contract, agreement, instrument or Governmental Requirement to which such
Subsidiary is subject (other than any Governmental Requirement the violation of
which, either individually or in the aggregate, would not have a Material
Adverse Effect), or result in the creation or imposition of, or obligation to
create, any Lien upon any Property of such Subsidiary, other than any Lien
permitted by this Agreement.

     Section 3.05 No Consents. Neither the Borrower's execution, delivery and
performance of the Note, the Warrant, this Agreement and the Ancillary Documents
to which it is a party, nor each Subsidiary's execution, delivery and
performance of the Ancillary Documents to which such Subsidiary is a party,
requires the consent or approval of any other Person.

     Section 3.06 Financial Condition. The Financial Statements have been
delivered to the Lender, have been prepared in accordance with GAAP,
consistently applied on a basis consistent with past practice, and fully and
accurately present the financial condition and changes in financial position of
the Borrower and its Subsidiaries as at the date or dates and for the period or
periods therein stated, subject only to typical year-end audit adjustments.
Since the date of the Balance Sheet, no event has occurred with respect to the
Property, operations, business, condition (financial or otherwise) or prospects
of the Borrower or any Subsidiary that could have a Material Adverse Effect.

     Section 3.07 Investments and Guaranties. At the date of this Agreement,
neither the Borrower nor any Subsidiary has made any investment in, advance to
or guarantee of the obligations of any Person except those the material details
of which are disclosed in the Financial Statements.

     Section 3.08 Liabilities; Litigation. Except for liabilities incurred in
the ordinary course of business, neither the Borrower nor any Subsidiary has any
material (individually or in the aggregate) liabilities, direct or contingent,
except those the material details of which are set forth in the Financial
Statements. There is no litigation, legal, administrative or arbitral
proceeding, investigation or other action of any nature pending or threatened
against or affecting the Borrower or any Subsidiary that involves the
possibility of any judgment or liability not fully covered by insurance, and
which could have a Material Adverse Effect. No unusual or unduly burdensome
restriction, restraint, or hazard exists by contract, law or governmental
regulation or otherwise relating to the business or Property of the Borrower or
any Subsidiary.

     Section 3.09 Taxes; Governmental Charges. The Borrower and its Subsidiaries
have filed all tax returns and reports required to be filed and have paid all
taxes, assessments, fees and other governmental charges levied upon any of them
or upon any of their respective Property or income that are due and payable,
including interest and penalties.



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     Section 3.10 Liens. The Borrower and its Subsidiaries have good and
marketable title to their respective (individually or in the aggregate)
Property, free and clear of all Liens except for (i) Liens the material details
of which have been set forth in the Financial Statements, (ii) Liens that do not
materially interfere with the occupation, use and enjoyment by the Borrower or
any Subsidiary of any of their respective Property in the ordinary course of
business as presently conducted or materially impair the value thereof and (iii)
Liens in favor of the Lender or otherwise specifically permitted or contemplated
by this Agreement or the Security Instruments.

     Section 3.11 Defaults. Neither the Borrower nor any Subsidiary is in
default, nor has any event or circumstance occurred that, with the passage of
time or the giving of notice or both would constitute a default, under any loan
or credit agreement, indenture, mortgage, deed of trust, security agreement or
other agreement or instrument evidencing or pertaining to any obligation for the
payment of money of the Borrower or any Subsidiary, or under any material
agreement or other instrument to which the Borrower or any Subsidiary is a party
or by which the Borrower or any Subsidiary or any of their respective Property
is or may be bound.

     Section 3.12 Casualties; Taking of Property. Since the date of the Balance
Sheet, neither the business nor the Property of the Borrower or any Subsidiary
have been materially and adversely affected as a result of any fire, explosion,
earthquake, flood, drought, windstorm, accident, strike or other labor
disturbance, embargo, requisition or taking of Property or cancellation of
contracts, permits or concessions by any domestic or foreign government or any
agency thereof, riot, activities of armed forces or acts of God or of any public
enemy.

     Section 3.13 Compliance with the Law. Neither the Borrower nor any
Subsidiary:

             (a) is in violation of any Governmental Requirement (other than any
     Governmental Requirement the failure to be in compliance with which, either
     individually or in the aggregate, would not have a Material Adverse
     Effect); or

             (b) has failed to obtain any license, permit, franchise or other
     governmental authorization necessary to the ownership of any of its
     Property or the conduct of its business;

which violation or failure could have (in the event such violation or failure
were asserted by any Person through appropriate action) a Material Adverse
Effect.

     Section 3.14 ERISA. The Borrower and its Subsidiaries are in compliance
with the applicable provisions of ERISA, and no "reportable event," as such term
is defined in Section 4043 of ERISA, has occurred with respect to any Plan of
the Borrower or any Subsidiary.


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     Section 3.15 Capitalization.

     (a) The Borrower's issued and outstanding capital stock consists solely of
the capital stock set forth in Schedule 3.15 hereto. The Borrower has not
issued, or agreed to issue, any Shares or any securities convertible into, or
exchangeable with, Shares or entered into, issued or granted, or agreed to
enter into, issue or grant, any rights, plans, options, warrants or agreements
for the purchase or acquisition (whether or not contingent) of any capital
stock (collectively, "Stock Rights") other than as set forth in such Schedule
3.15. All of the Borrower's issued and outstanding capital stock was duly
authorized and validly issued and is fully-paid and nonassessable. All of the
Borrower's issuances of its capital stock and Stock Rights were made in
compliance with all applicable laws and with VSE rules and regulations.

     (b) Except as to Petrovalve International (Barbados) Inc., of which the
Borrower owns beneficially and of record 98% of the issued and outstanding
capital stock, the Borrower owns, directly or indirectly, 100% of the issued and
outstanding capital stock of all of the Subsidiaries. All of the capital stock
of each Subsidiary was duly authorized and validly issued and is fully-paid and
nonassessable. The capital stock of Petrovalve International Inc., an Alberta
corporation, Petrovalve, Inc., a Delaware corporation, USA Petrovalve, Inc., a
Texas corporation, and Turbeco, Inc., a Texas corporation, that has been pledged
to the Lender as part of the security for the Loan constitutes all of the
capital stock of such corporations. No Subsidiary has issued, or agreed to
issue, any shares of capital stock or any securities convertible into, or
exchangeable with, shares of capital stock or entered into, issued or granted,
or agreed to enter into, issue or grant, any Stock Rights.

     Section 3.16 Trade Rights. There are no pending or threatened claims
against the Borrower or any Subsidiary alleging infringement of, or conflict
with the rights of others under, any patent, patent application, trademark,
service mark, copyright, trade secret or similar intangible franchise, license
or right (collectively, "Trade Rights") and, to the best of the Borrower's
knowledge, no reasonable basis exists for any such allegation.

     Section 3.17 Necessary Approvals. The Borrower and each Subsidiary validly
holds all permits, licenses, approvals and Trade Rights necessary or desirable
to enable it to conduct its business as it is currently conducted.

     Section 3.18 No Material Misstatements. No information that the Borrower or
any Subsidiary has furnished to the Lender in any form in connection with the
negotiation of this Agreement contained or contains any material misstatement of
fact or omitted or omits to state a material fact or any fact necessary to make
the statements contained therein not misleading.

                                    ARTICLE 4

                              AFFIRMATIVE COVENANTS

     The Borrower shall at all times comply with the covenants contained in this
Article 4 for so long as any part of the Indebtedness remains outstanding:

     Section 4.01 Financial Statements and Reports. The Borrower shall promptly
furnish to the Lender from time to time such information regarding the business
and affairs and financial condition of the Borrower and its Subsidiaries as the
Lender may reasonably request, and shall also furnish to the Lender the
following:


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     (a) Annual Reports. Promptly after becoming available and in any event
within 140 days after the close of each fiscal year of the Borrower (or such
shorter period of time within which the Borrower must file such information with
the Commission), the audited consolidated and consolidating balance sheets of
the Borrower and its Subsidiaries as at the end of such year, the audited
consolidated and consolidating statements of profit and loss of the Borrower and
its Subsidiaries for such year and the audited consolidated and consolidating
statements of reconciliation of capital accounts of the Borrower and its
Subsidiaries for such year, setting forth in each case in comparative form the
corresponding figures for the preceding fiscal year, accompanied by the related
report of the Borrower's independent public accountants, which report shall be
to the effect that such statements have been prepared in accordance with GAAP
consistently applied throughout the period indicated except to the extent stated
therein; and

     (b) Quarterly Reports. Promptly after becoming available and in any event
within 60 (or such shorter period of time within which the Borrower must file
such information with the Commission) days after the end of each of the first
three quarterly periods in each fiscal year of the Borrower, the consolidated
and consolidating balance sheets of the Borrower and its Subsidiaries as at the
end of such period, the consolidated and consolidating statements of profit and
loss of the Borrower and its Subsidiaries for such quarter and for the period
from the beginning of the fiscal year to the close of such quarter, and the
consolidated and consolidating statements of reconciliation of capital accounts
of the Borrower and its Subsidiaries for such quarter and for the period from
the beginning of the fiscal year to the close of such quarter, setting forth in
each case in comparative form the corresponding figures for the corresponding
period of the immediately-preceding fiscal year, certified by the principal
financial officer of the Borrower to have been prepared in accordance with GAAP
consistently applied throughout the period indicated except to the extent stated
therein, subject to typical changes resulting from year-end adjustments; and

     (c) Audit Reports. Promptly upon receipt thereof, one copy of each other
report submitted to the Borrower or any Subsidiary by independent accountants in
connection with any annual, interim or special audit made by them of the books
of the Borrower or any Subsidiary.

     (d) Commission and Other Reports. Promptly upon their becoming available,
one copy of each financial statement, report, notice or proxy statement sent by
the Borrower to stockholders generally, and of each regular or periodic report
and any registration statement, prospectus or written communication (other than
transmittal letters) in respect thereof filed by the Borrower with, or received
by the Borrower in connection therewith from, any securities exchange or the
Commission.

     Section 4.02 Certificates of Compliance. Concurrently with the furnishing
of the annual and quarterly financial statements pursuant to Subsections 4.01(a)
and (b) hereof, the Borrower shall furnish or cause to be furnished to the
Lender a certificate in form and substance satisfactory to the Lender signed by
the principal financial officer of the Borrower stating (i) that the Borrower
has fulfilled its obligations under this Agreement, the Note, the Warrant and
the Security Instruments; and (ii) that all representations made herein and
therein continue to be true and correct (or specifying the nature of any
change), or, if any Potential Default shall have occurred and be continuing,
specifying such Potential Default and the nature and status thereof; and (iii)
containing or accompanied by such financial or other details, information and
material as the Lender reasonably may request to evidence such compliance.



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     Section 4.03 Taxes and Other Liens. The Borrower shall pay and discharge
promptly all taxes, assessments and governmental charges or levies imposed upon
the Borrower or any Subsidiary or upon the income or any Property of the
Borrower or any Subsidiary as well as all claims of any kind (including claims
for labor, materials, supplies and rent) that, if unpaid, might become a Lien
upon any or all of the Property of the Borrower or any Subsidiary; provided,
however, that neither the Borrower nor any Subsidiary shall be required to pay
any such tax, assessment, charge, levy or claim if the amount, applicability or
validity thereof shall currently be contested in good faith by appropriate
proceedings diligently conducted by or on behalf of the Borrower or its
Subsidiary, and if the Borrower or its Subsidiary shall have set up reserves
therefor adequate under GAAP.

     Section 4.04 Maintenance of Rights and Property. The Borrower shall and
shall cause each Subsidiary to (i) maintain its corporate existence, rights and
franchises; (ii) observe and comply with all Governmental Requirements (other
than any Governmental Requirement the violation of which, either individually or
in the aggregate, would not have a Material Adverse Effect); and (iii) maintain
its Property in good operating condition at all times and make all repairs,
replacements, additions, betterments and improvements to its Property as are
necessary or appropriate to enable the Borrower and each Subsidiary to conduct
their respective businesses properly and efficiently at all times.

     Section 4.05 Payment of the Lender's Costs. Fees and Expenses. Promptly
upon the Lender's written request, the Borrower shall pay (or shall reimburse
the Lender for) all Expenses that the Lender may incur, directly or indirectly,
in connection with:

     (a)     the preparation and negotiation of this Agreement and all other
documents and instruments contemplated hereby (including without limitation, all
Security Instruments), and any and all amendments hereto or thereto and consents
or waivers hereunder or thereunder);

     (b)     the Lender's satisfaction of any of the Borrower's obligations 
under this Agreement or any Security Instrument;

     (c)     the collection of the Note, or the enforcement of the Lender's 
rights under this Agreement, the Warrant or any of the Ancillary Documents; and

     (d)     the recording or filing of Security Instruments.

     Section 4.06 Insurance. The Borrower and its Subsidiaries now maintain (and
the Borrower shall, and shall cause each Subsidiary to, continue to maintain),
with financially sound and reputable insurers, insurance with respect to their
respective Property and businesses against such liabilities, casualties, risks
and contingencies and in such types and amounts as is customary for Persons
engaged in the same or similar businesses and similarly situated. Upon the
Lender's request, the Borrower shall furnish, or cause to be furnished, to the
Lender from time to time a summary of the insurance coverage of the Borrower and
its Subsidiaries in form and substance satisfactory to the Lender and, if
requested, shall furnish the Lender with true and complete copies of the
applicable policies. In the case of any fire, accident or other casualty causing
loss or damage to any Property of the Borrower or a Subsidiary, the proceeds of
such policies shall be used (i) to repair or replace the damaged Property or
(ii) to prepay the Indebtedness.


                                       11
   12

     Section 4.07 Accounts and Records. The Borrower shall keep, and shall cause
each Subsidiary to keep, books of record and account in which full, true and
correct entries shall be made of all dealings or transactions in relation to
their respective business and activities, in accordance with GAAP, consistently
applied except for changes in accounting principles or practices with which the
Borrower's independent public accountants concur.

     Section 4.08 Right of Inspection.

     The Borrower shall permit any officer, employee or agent of the Lender to
visit and inspect any of the Borrower's Property, to examine the Borrower's
books of record and accounts and to take copies and extracts therefrom, and to
discuss the Borrower's affairs, finances and accounts with the Borrower's
officers, accountants and auditors, all at such times and places as the Lender
reasonably may require.

     The Borrower shall cause each Subsidiary to permit any officer, employee or
agent of the Lender to visit and inspect any of such Subsidiary's Property, to
examine such Subsidiary's books of record and accounts and to take copies and
extracts therefrom, and to discuss such Subsidiary's affairs, finances and
accounts with such Subsidiary's officers, accountants and auditors, all at such
times and places as the Lender reasonably may require.

     Section 4.09 Notice of Certain Events. The Borrower shall notify the Lender
promptly if the Borrower learns of the occurrence of:

     (a)     any event that constitutes a Potential Default, and shall in such 
case provide with the notice a detailed statement by a responsible officer of
the Borrower of the steps being taken to cure the effect of such Potential
Default; or

     (b)     the receipt of any notice from, or the taking of any other action 
by, the holder of any promissory note, debenture or other evidence of
indebtedness of the Borrower or any Subsidiary or of any security (as defined in
the Securities Act of 1933, as amended) of the Borrower or any Subsidiary with
respect to a claimed default, and shall in such case provide with the notice a
detailed statement by a responsible officer of the Borrower specifying the
notice given or other action taken by such holder and the nature of the claimed
default and what action the Borrower or its Subsidiary is taking or proposes to
take with respect thereto; or

     (c)     any legal, judicial or regulatory proceedings affecting the 
Borrower or any Subsidiary or any of their respective Property in which the
amount involved is material and is not covered by insurance or that, if
adversely determined, could have a Material Adverse Effect; or

     (d)     any pending or threatened dispute between the Borrower or any
Subsidiary and any governmental or regulatory body or any other Person that, if
adversely determined, could have a Material Adverse Effect.




                                       12
   13

     Section 4.10 ERISA Information and Compliance. The Borrower shall promptly
furnish to the Lender (i), if the Lender requests, copies of each annual and
other report with respect to each Plan or any trust created thereunder promptly
after the filing thereof with the United States Secretary of Labor or the
Pension Benefit Guaranty Corporation and (ii), immediately upon becoming aware
of the occurrence of any "reportable event," as such term is defined in Section
4043 of ERISA, or of any "prohibited transaction," as such term is defined in
Section 4975 of the Code, in connection with any Plan or any trust created
thereunder, a written notice signed by the President or the principal financial
officer of the Borrower specifying the nature thereof, what action the Borrower
or any of its Subsidiaries is taking or proposes to take with respect thereto
and, when known, any action taken by the Internal Revenue Service with respect
thereto. The Borrower shall fund, or shall cause its Subsidiaries to fund, all
current service pension liabilities as they are incurred under the provisions of
all Plans from time to time in effect for the benefit of employees of the
Borrower or any of its Subsidiaries, and comply with all applicable provisions
of ERISA.

     Section 4.11 Use of Proceeds. The proceeds of the Note shall be applied by
the Borrower only for the following purposes and only in the following order:

     (a)     to pay all of the Lender's Expenses in connection with the Existing
TOSI Loan;

     (b)     to pay all of the Lender's Expenses described in Section 4.05;

     (c)     to pay all amounts due under the Existing TOSI Loan;

     (d)     to pay the Borrower's indebtedness as set forth in Schedule 4.11
hereto; and

     (e)     for working capital and other general corporate purposes.

     Section 4.12 VSE Listing. The Borrower shall ensure at all times that:

     (a)     the maximum number of Shares then-issuable upon conversion of the
principal amount of the Loan and upon exercise of the Warrant are listed on the
VSE;

     (b)     the Borrower is not in default of its listing agreement with the 
VSE; and

     (c)     trading in the Shares is not suspended for any reason.

     Section 4.13 Reservation of Shares. The Borrower shall ensure that, at all
times, the Borrower has duly reserved for issuance out of its authorized capital
the maximum number of Shares issuable upon conversion of the principal amount of
the Loan and upon exercise of the Warrant.

     Section 4.14 Status of Warrant upon Issuance. The Lender shall take
delivery of the Warrant at the Closing free and clear of all Liens.

     Section 4.15 Status of Shares upon Issuance. All Shares issued upon
conversion of the principal amount of the Loan, upon exercise of the Warrant and
in payment of the finder's fee described in Section 7.02(b) shall


                                       13
   14

be duly authorized, validly issued, fully paid and nonassessable, and free and
clear of all Liens.

     Section 4.16 Lender's Right of First Refusal with respect to Future
Borrower Financings. The Borrower hereby grants to the Lender a right of first
refusal with respect to future Borrower financings on the terms and conditions
set forth in Schedule 4.16 hereto.

                                    ARTICLE 5

                               NEGATIVE COVENANTS

     The Borrower shall at all times comply with the covenants contained in this
Article 5 so long as any part of the Indebtedness remains outstanding:

     Section 5.01 Indebtedness. The Borrower shall not, and shall not permit any
Subsidiary to, incur, create, assume or suffer to exist any indebtedness or
obligation for payment of money (including obligations for the payment of
rentals) other than the Indebtedness, or to guarantee or in any way to be or
become liable in respect of, or to be responsible for, any such indebtedness or
obligation of any other Person in any way other than in the ordinary course of
business.

     Section 5.02 Liens. The Borrower shall not, and shall not permit any
Subsidiary to, incur, create, assume or suffer to exist any Lien on any of its
Property (now held or hereafter acquired) other than (a) Liens securing the
payment of any Indebtedness and (b) Excepted Liens.

     Section 5.03 Investments, Loans and Advances. The Borrower shall not, and
shall not permit any Subsidiary to, make or permit to remain outstanding any
loans or advances to or investments in any Person other than in the ordinary
course of business.

     Section 5.04 Dividends. Distributions and Redemptions. The Borrower shall
not declare or pay any dividend or distribution, or purchase, redeem, retire or
otherwise acquire for value any of its capital stock now or hereafter
outstanding, return any capital to its stockholders, or make any distribution of
its assets to its stockholders as such, or permit any of its Subsidiaries to
purchase or otherwise acquire for value any capital stock of the Borrower.

     Section 5.05 Fundamental Corporate Transactions. The Borrower shall not
merge or consolidate with, or sell, assign, lease or otherwise dispose of
(whether in one transaction or in a series of transactions) all, substantially
all or an integral portion of its Property (whether now owned or hereafter
acquired) to, any Person, or permit any Subsidiary to do so, except that any
Subsidiary may merge into or consolidate with or transfer Property to any other
Subsidiary and any Subsidiary may merge into or transfer Property to the
Borrower; provided, however, that, in each case, immediately thereafter and
giving effect thereto, no event shall occur and be continuing that constitutes a
Potential Default or an Event of Default and that, in the case of any such
merger or consolidation to which the Borrower is a party, the Borrower is the
surviving corporation.



                                       14
   15

     Section 5.06 Sales and Leasebacks. The Borrower shall not, and shall not
permit any subsidiary to, enter into any arrangement, directly or indirectly,
with any Person whereby the Borrower or any Subsidiary shall sell or transfer
any Property, whether now owned or hereafter acquired, and whereby the Borrower
or any Subsidiary shall then or thereafter rent or lease as lessee such Property
or any part thereof or other Property which the Borrower or any Subsidiary
intends to use for substantially the same purpose or purposes as the Property
sold or transferred.

     Section 5.07 ERISA Compliance. The Borrower shall not at any time permit
any Plan maintained by it or any Subsidiary to:

     (a)     engage in any "prohibited transaction," as such term is defined in
Section 4975 of the Code, as amended;

     (b)     incur any "accumulated funding deficiency," as such term is defined
in Section 302 of ERISA; or

     (c)     terminate any such Plan in a manner which could result in the
imposition of a Lien on the Property of the Borrower or any Subsidiary pursuant
to Section 4068 of ERISA.

     Section 5.08 Nature of Business. The Borrower shall not, and shall not
permit any Subsidiary to, materially change the character of its business as
carried on at the date hereof.

     Section 5.09 Margin Stock. Neither the Borrower nor any Subsidiary shall
take any action that might cause the Note, this Agreement or any of the Security
Instruments to violate Regulation U of the Board of Governors of the United
States Federal Reserve System (12 C.F.R. Part 221) (the "Federal Reserve Board")
or any other regulation of the Federal Reserve Board or to violate Section 7 of
the Exchange Act of 1934 or any rule or regulation thereunder, in each case as
now in effect or as the same may hereinafter be in effect.

     Section 5.10 VSE Listing. The Borrower shall not de-list, or allow the
de-listing of, the Shares from the VSE unless such de-listing occurs at a time
when such Shares are listed on the NASDAQ Stock Market or other
nationally-recognized United States stock market.

                                    ARTICLE 6

                                EVENTS OF DEFAULT

     Section 6.01 Events. Any of the following events shall be considered an
"Event of Default:"

     (a)     the Borrower fails to pay when due any installment of principal or
interest on the Note or other Indebtedness; or

     (b)     any of the Borrower's representations or warranties set forth 
herein, in the Note, in the Warrant or in any Ancillary Document to which it is
a party, or any Subsidiary's representations or

                                       15
   16

warranties set forth in any Ancillary Document to which it is a party, proves to
have been incorrect in any material respect as of the date hereof or thereof; or
any representation, statement (including financial statement), certificate,
request or other document furnished pursuant to or under this Agreement, the
Note, the Warrant or any Ancillary Document proves to have been incorrect in any
material respect as of the date when made or deemed made; or

     (c)     the Borrower fails duly, timely and fully to perform or observe any
of its covenants or agreements set forth in Section 4.11, Article S and Section
7.04 of this Agreement; or

     (d)     the Borrower fails duly, timely and fully to perform or observe any
of its covenants or agreements set forth in this Agreement (other than any such
covenants and agreements set forth in Section 4.11, Article 5 or Section 7.04
hereof), and such failure continues unremedied for a period of 10 days after the
earlier of (i) the Lender's notice thereof to the Borrower and (ii) such failure
otherwise becomes known to the Borrower; or

     (e)     the Borrower defaults in any of its obligations under the Warrant 
or any of the Ancillary Documents to which it is a party and such default is not
cured within the grace period, if any, provided therein, or a Subsidiary
defaults in any of its obligations under any of the Ancillary Documents to which
it is a party and such default is not cured within the grace period, if any,
provided therein; or

     (f)     an involuntary case or other proceeding is commenced against the
Borrower that seeks liquidation, reorganization or other relief with respect to
it or its debts or other liabilities under any bankruptcy, insolvency or other
similar law now or hereafter in effect or seeking the appointment of a trustee,
receiver, liquidator, custodian or other similar official of it or any
substantial part of its Property, and such involuntary case or other proceeding
shall remain undismissed or unstayed for a period of 30 days; or an order for
relief against the Borrower shall be entered in any such case under the Federal
Bankruptcy Code; or

     (g)     the Borrower commences a voluntary case or other proceeding seeking
liquidation, reorganization or other relief with respect to itself or its debts
or other liabilities under any bankruptcy, insolvency or other similar law now
or hereafter in effect or seeking the appointment of a trustee, receiver,
liquidator, custodian or other similar official of it or any substantial part of
its Property, or shall consent to any such relief or to the appointment of or
taking possession by any such official in an involuntary case or other
proceeding commenced against it, or shall make a general assignment for the
benefit of creditors, or shall fail generally to, or shall admit in writing its
inability to, pay its debts generally as they become due, or shall take any
corporate action to authorize or effect any of the foregoing; or

     (h)     the Borrower or any Subsidiary discontinues or materially alters 
its usual business; or

     (i)     the Borrower fails to make any payment due on any other 
indebtedness or obligation for the payment of money; or any event shall occur or
any condition shall exist in respect of any such indebtedness or obligation, or
under any agreement or instrument under or by which any such indebtedness or
obligation is created, evidenced or secured, the effect of which, with notice,
lapse of time, or both, is to


                                       16
   17

cause or to permit any holder of such indebtedness or obligation to cause such
indebtedness or obligation, or a portion thereof, to become due prior to its
stated maturity or prior to its regularly scheduled dates of payment; or

     (j)     the Borrower shall fail within 30 days to pay, bond or otherwise
discharge any judgment or order for the payment of money in excess of $50,000
that is not otherwise being satisfied in accordance with its terms or is not
stayed on appeal; or

     (k)     any Subsidiary takes, suffers or permits to exist as to such 
Subsidiary any of the events or conditions referred to in Subsections 6.01(f),
(g), (h), (i) or (j) hereof; or

     (1)     any Security Instrument shall for any reason, except to the extent
permitted by the terms thereof, cease to be in full force and effect and valid,
binding enforceable in accordance with its terms (except to the extent that
enforcement may be subject to any applicable bankruptcy, insolvency or similar
laws of general application affecting the enforcement of creditors' rights), or
cease to create a valid and perfected Lien of the priority required thereby on
any of the collateral purported to be covered thereby, or the Borrower shall so
state in writing; or

     (m)     the Lender notifies the Borrower that the Lender in good faith has
a sound reason to be insecure with respect to the Note or any other
Indebtedness, giving the Lender's reason for such insecurity in such notice, and
the Lender continues to have a sound reason to be insecure for a period of 30
days after the delivery of such notice; or

     (n)     the Judgment has not been satisfied and released in full; or

     (o)     the liens securing the indebtedness that was the subject of the
Judgment have not been released in full and the evidences of such releases
properly recorded; or

     (p)     any receivership ordered by the court in connection with the
Judgment has not been dissolved; or

     (q)     the Lender ceases at any time to have at least one person that it
has designated serving on the Borrower's Board of Directors (each a
"Lender-designated Director"); or

     (r)     the Borrower increases the size of its Board of Directors without
the consent of each Lender-designated Director.

     Section 6.02 Remedies. Upon the occurrence of any Event of Default
described in Subsection 6.01(f) or (g), hereof, or in Subsection 6.01(k) to the
extent that such Subsection refers to Subsection 6.01(f) or (g) hereof, the
obligations, if any, of the Lender hereunder shall immediately terminate, and
the entire amount of all Indebtedness then outstanding shall become
automatically and immediately due and payable, all without written notice and
without presentment, demand, protest, notice of protest or dishonor, notice of
intention to accelerate, notice of acceleration or any other notice of default
of any kind, all of which are hereby expressly waived by the Borrower. Upon the
occurrence and at any time during the


                                       17
   18

continuance of any other Event of Default, by written notice to the Borrower the
Lender may (i) declare all Indebtedness to be immediately due and payable
without presentment, demand, protest, notice of protest or dishonor, notice of
intention to accelerate or other notice of default of any kind, all of which are
hereby expressly waived by the Borrower, and/or (ii) terminate the obligations,
if any, of the Lender hereunder unless and until the Lender shall reinstate same
in writing.

     Section 6.03 Right of Set-off. Upon the occurrence and during the
continuance of any Event of Default, or if the Borrower becomes insolvent,
however evidenced, the Lender is hereby authorized at any time and from time to
time, without notice to the Borrower (any such notice being expressly waived by
the Borrower), to set-off and apply any and all moneys at any time held and
other indebtedness at any time owing by the Lender to the Borrower against any
and all of the Indebtedness of the Borrower, irrespective of whether or not the
Lender shall have made any demand under this Agreement or the Note and although
such obligations may be unmatured. The Lender agrees promptly to notify the
Borrower after any such setoff and application, provided that the failure to
give such notice shall not affect the validity of such set-off and application.
The rights of the Lender under this Section are in addition to other rights and
remedies (including, without limitation, other rights of set-off) that the
Lender may have.

                                    ARTICLE 7

                              CONDITIONS OF LENDING

     The obligation of the Lender to make the Loan is subject to the conditions
precedent stated in this Article 7 wherein each document to be delivered to the
Lender shall be in form and substance satisfactory to it.

     Section 7.01 Closing. The closing of the Loan (the "Closing") shall take
place contemporaneously with the execution of this Agreement; provided, however,
that the Borrower's issuance of any securities in connection with the Closing
shall not occur until the VSE has granted formal approval of the transactions
contemplated hereby.

     Section 7.02 Conditions Precedent to the Loan. As conditions precedent to
Lender's making of the Loan, the following shall occur prior to or at the
Closing:

     (a)     the Borrower shall have duly and validly issued, executed and 
delivered the Note and the Warrant to the Lender;

     (b)     the Borrower shall have paid to David S. Hunt a finder's fee of
CDN$52,200.00 (US$37,500.00) in the form of 350,000 Shares issued to him at a
deemed price of CDN$0.15 per Share;

     (c)     the Borrower shall have effected the appointment or election of one
Lender-designated person to the Borrower's Board of Directors;

     (d)     the Borrower shall have entered into a three-year employment 
agreement with William G. Jayroe on terms and conditions acceptable to the
Lender;



                                       18
   19

     (e)     the Borrower shall have consummated the Private Placement on terms
and conditions acceptable to the Lender;

     (f)     the Borrower shall have terminated the Shareholder Protection 
Rights Plan;

     (g)     Hector Dominguez and Camuri Holding LLP shall have entered into an
agreement not to reduce their respective holdings of Shares on terms and
conditions acceptable to the Lender;

     (h)     the Borrower shall have paid in full the Expenses specified in 
Section 4.11(a) and (b) in cash by wire transfer of such funds to such account
as the Lender shall have designated;

     (i)     the Borrower shall have repaid in full all amounts owing under the
Existing TOSI Loan in cash by wire transfer of such funds to such account as the
Lender shall have designated; and

     (j)     the Borrower shall have made the following additional deliveries to
the Lender:

             (i) to the extent that the Province of Alberta issues such
     documents or their respective analogues, certificates of existence and good
     standing of the Borrower in the Province of Alberta;

             (ii) a certificate of the Secretary or Assistant Secretary of the
     Borrower certifying (A) the Borrower's charter and bylaws, (B) duly adopted
     resolutions of the Borrower's board of directors in form and substance
     satisfactory to the Lender with respect to the authorization of this
     Agreement, the Note, the Warrant and the Ancillary Documents to which the
     Borrower is a party, and the officers of the Borrower authorized to sign
     such instruments, and (C) specimen signatures of the officers so
     authorized;

             (iii) a certificate of the Secretary or Assistant Secretary of each
     Subsidiary that is guaranteeing the Loan certifying (A) such Subsidiary's
     charter and bylaws, (B) duly adopted resolutions of such Subsidiary's board
     of directors in form and substance satisfactory to the Lender with respect
     to the authorization of the Ancillary Documents to which such Subsidiary is
     a party, and the officers of such Subsidiary authorized to sign such
     instruments, and (C) specimen signatures of the officers so authorized;

             (iv) a legal opinion of the Borrower's legal counsel addressed to
     the Lender in form and substance satisfactory to the Lender;

             (v) duly-executed originals (in such number as the Lender
     reasonably shall request) of the Registration Rights Agreement; and

             (vi) such other documents and things as the Lender reasonably shall
     request in writing at least three (3) days prior to the Closing.

     Section 7.03 Closing Deliveries of the Lender. At the Closing and following
the satisfaction or waiver of the conditions precedent set forth in Section
7.02, the Lender shall deliver the proceeds of the Loan by wire transfer to such
account as the Borrower reasonably shall request.

                                       19
   20

     Section 7.04 Subsequent Deliveries. Notwithstanding anything to the
contrary in this Article 7, the parties acknowledge and agree that, due to the
necessity of having the Closing occur at the earliest possible time, the
Borrower may not be able to satisfy all of the conditions precedent to the
Closing required by Section 7.02 prior to or at the Closing. In consideration of
the Lender's willingness to close the Loan without such satisfaction, the
Borrower covenants and agrees that the Borrower shall satisfy all of such
conditions precedent required pursuant to Section 7.02 but not satisfied prior
to or at the Closing as soon as possible following the Closing, but in any event
no later than fifteen (15) Business Days thereafter, except that consummation of
the Private Placement referenced in Section 7.02(e) must occur in any event no
later than thirty (30) Business Days thereafter.

                                    ARTICLE 8

                                  MISCELLANEOUS

     Section 8.01 Proof of Indebtedness. The Lender's records shall be prima
facie proof as to:

     (a)     the amount of principal, interest or other moneys under the Loan 
owing at any time;

     (b)     the existence of any default in the payment of any moneys under the
Note; and

     (c)     whether any demand for payment under the Note has been made.

     Section 8.02 Time of Essence. Time shall be of the essence of each and
every provision hereof and of the Note.

     Section 8.03 Notices. Any notice required or permitted to be given under or
in connection with this Agreement, the Security Instruments or the Note shall
(except as may otherwise be expressly required therein) be in writing and shall
be delivered (a) by certified mail, return receipt requested, (b) by overnight
delivery service, (c) by facsimile transmission, confirmed telephonically or (d)
personally to an executive officer of the receiving party. All such
communications shall be mailed, sent or delivered as follows:

     If to the Borrower:

     Flotek Industries Inc.
     7030 Empire Central Drive
     Houston  TX 77040
     Attention:  President
     Telephone:  713/849-9911
     Facsimile:  713/896-4511




                                       20
   21

     If to the Lender:

     TOSI, L. P.
     c/o J. W. Beavers, Jr.
     3900 Thanksgiving Tower
     1601 Elm Street
     Dallas  TX 75201
     Telephone:    214/922-0135
     Facsimile:    214/880-7101

Any communication delivered in accordance with this Section shall be deemed
received (a), if delivered by certified mail, return receipt requested, on the
date of delivery indicated on the return receipt, (b), if delivered by overnight
delivery service, on the following Business Day, (c), if delivered by facsimile
transmission, on the date that the transmission is confirmed telephonically or
(d), if personally to an executive officer of the receiving party, on the date
of such delivery.

     Section 8.04 Amendments and Waivers. This Agreement may not be modified,
amended or terminated orally and no waiver of compliance with any provision or
condition hereof and no consent provided for herein shall be effective unless
evidenced by an instrument in writing duly executed by the party hereto sought
to be charged with such waiver or consent. No course of dealing on the part of
the Lender, its officers, employees, consultants or agents, nor any failure or
delay by the Lender with respect to exercising any right, power or privilege of
the Lender under this Agreement, the Note or any Security Instrument shall
operate as a waiver thereof. No waiver of any term or provision hereof shall be
construed as a further or continuing waiver of such term or provision or any
other term or provision.

     Section 8.05 Severability. If any provision of this Agreement or the
application thereof to any Person or circumstance shall be invalid or
unenforceable to any extent, the remainder of this Agreement and the application
of such provision to other persons or circumstances shall not be affected
thereby and shall be enforced to the greatest extent permitted by law as long as
the economic or legal substance of the transactions contemplated hereby is not
affected in any manner materially adverse to any party.

     Section 8.06 Survival. All covenants and agreements of the Borrower herein,
in the Note, the Warrant and in the Ancillary Documents not fully performed
before the date hereof or thereof and all representations and warranties of the
Borrower herein or therein shall survive the execution and delivery hereof and
thereof.

     Section 8.07 Successors and Assigns. All of the Borrower's covenants and
agreements set forth in this Agreement, the Note and the Security Instruments
shall bind its successors and assigns and shall inure to the benefit of the
Lender and its successors and assigns; provided, however, that the Borrower may
not assign its rights or obligations under this Agreement or any interest
herein, without in each instance the Lender's prior written consent.

     Section 8.08 Renewal, Extension or Rearrangement. All provisions of this
Agreement and of the Security Instruments relating to the Note or other
Indebtedness shall apply with equal force and effect to each and


                                       21
   22

all promissory notes hereafter executed that represent, in whole or in part, a
renewal, extension for any period, increase or rearrangement of any part of the
Indebtedness originally represented by the Note or of any part of such other
Indebtedness.

     Section 8.09 Cumulative Rights. The Lender's rights and remedies under this
Agreement, the Note and each Security Instrument shall be cumulative, and the
exercise or partial exercise of any such right or remedy shall not preclude the
exercise of any other right or remedy.

     Section 8.10 Further Assurances. At the Borrower's sole cost and expense,
each of the Lender, the Borrower and each Subsidiary covenants and agrees to
execute any and all such further documents and instruments and to do such
further things as the Lender in its sole discretion may deem necessary or
appropriate to implement fully and carry out the intent of this Agreement, the
Note, the Warrant and the Ancillary Documents.

     Section 8.11 Governing Law. This Agreement and the Note are contracts made
under, and shall be construed in accordance with and governed by, the laws of
the Province of Alberta (exclusive of any such laws that pertain to conflicts of
laws).

     Section 8.12 Entire Agreement. This Agreement, the Note, the Warrant and
the Ancillary Documents embody the entire agreement and understanding between
the Lender and the Borrower with respect to the subject matter hereof and
thereof and supersede all prior agreements and understandings between such
parties in such regard.

     Section 8.13 Schedules and Exhibits. The schedules and exhibits attached to
this Agreement are incorporated herein and shall be considered a part of this
Agreement for the purposes stated herein, except that in the event of any
conflict between any of the provisions of such schedules and exhibits and the
provisions of the text of this Agreement, the provisions of the text of this
Agreement shall prevail.

     Section 8.14 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be an original and all of which taken together
shall constitute one and the same instrument. Signatures exchanged by facsimile
transmission shall be deemed to constitute original, manually-executed
signatures and shall be fully binding.

     Section 8.15 Headings. Headings of the Articles and Sections of this
Agreement are for the convenience of the parties only, and shall be given no
substantive or interpretive effect whatsoever.



                                       22
   23

     IN WITNESS WHEREOF, the parties hereto have entered into this Convertible
Loan Agreement as of the date first above written.


BORROWER:                              FLOTEK INDUSTRIES INC.


                                       By: /s/ WILLIAM G. JAYROE
                                          ------------------------------------
                                          William G. Jayroe, President and
                                            Chief Executive Officer



                                       By: /s/ SCOTT COOK
                                          ------------------------------------


                                       Name:   Scott Cook
                                            ----------------------------------


                                       Title:  Vice President
                                             ---------------------------------


LENDER:                                TOSI, L.P., a Texas limited partnership

                                       By: Pitman Property Corp.,
                                           a Texas Corporation, General Partner



                                       By: /s/ J. W. BEAVERS, JR
                                          ------------------------------------
                                          J. W. Beavers, Jr., President



                                       23
   24

                                  Exhibit 1.01

                             Form of Promissory Note

                             FORM OF PROMISSORY NOTE
October ___, 1997                                                 US$750,000.00

     FOR VALUE RECEIVED, FLOTEK INDUSTRIES INC., an Alberta corporation
("Borrower"), promises to pay to the order of TOSI, L.P., a Texas limited
partnership ("Lender"), on or before October ___, 1998, at its office at 3900
Thanksgiving Tower, 1601 Elm Street, Dallas, Texas 75201, or at such other
location as Lender may designate, in immediately available funds, SEVEN HUNDRED
FIFTY THOUSAND AND NO/100 UNITED STATES DOLLARS (US$750,000.00). Borrower will
also pay interest on the unpaid principal balance outstanding from time to time
at a fixed rate of ten percent (10%) per annum, payable quarterly in arrears.

     Interest will be computed on the basis of the actual number of days elapsed
and a year comprising 360 days, unless such calculation would result in a
usurious interest rate, in which case such interest will be calculated on the
basis of a 365 or 366 day year, as the case may be.

     All past due principal and interest on this Note will, at Lender's option,
bear interest at the maximum nonusurious rate of interest ("Highest Lawful
Rate") or, if applicable law does not provide for a maximum nonusurious rate of
interest, at a rate per annum equal to 18%.

     Borrower covenants to apply the total amount advanced by Lender hereunder
only in the manner set forth in that certain Convertible Loan Agreement of even
date herewith between Borrower and Lender (the "Loan Agreement"). Borrower
understands and acknowledges that Lender would not be willing to make the loan
evidenced hereby but for Borrower's covenant set forth in the immediately-
preceding sentence.

     All undefined capitalized terms used in this Note shall have the meanings
respectively ascribed to them in the Loan Agreement.

     In addition to all principal and accrued interest on this Note, Borrower
agrees to pay: (a) all reasonable costs and expenses incurred by or on behalf of
Lender and all owners and holders of this Note in attempting to collect this
Note through probate, reorganization, bankruptcy or any other proceeding; and
(b) reasonable attorneys fees if and when this Note is placed in the hands of an
attorney for collection.

     The outstanding principal amount of the Loan evidenced by this Note shall
be convertible into common shares of Borrower in the manner and to the extent
set forth in the Loan Agreement.


                                 Exhibit 1.01-1
   25

     Borrower and Lender intend to conform strictly to applicable usury laws.
Therefore, the total amount of interest (as defined under applicable law)
contracted for, charged or collected under this Note will never exceed the
Highest Lawful Rate. If Lender contracts for, charges or receives any excess
interest, it will be deemed a mistake. Lender will automatically reform the
contract or charge to conform to applicable law and, if excess interest has been
received, Lender will either refund the excess to Borrower or credit the excess
on the unpaid principal amount of this Note. All amounts constituting interest
will be spread throughout the full term of this Note in determining whether
interest exceeds lawful amounts.

     The unpaid principal balance of this Note at any time will be the total
amount advanced by Lender, less the amount of all payments of principal.
Borrower may at any time pay the full amount of this Note without the payment of
any premium, penalty or fee.

     "Loan Document" means this Note and any document or instrument evidencing,
securing, guaranteeing or given in connection with this Note including, without
limitation, the Loan Agreement, the Warrant and the Registration Rights
Agreement. "Obligations" means all principal, interest and other amounts which
are or become owing under this Note or any other Loan Document. "Obligor" means
Borrower and any guarantor, surety, co-signer, or other person who may now or
hereafter be obligated to pay all or any part of the Obligations. Where
appropriate, the masculine gender includes the feminine and the neuter and the
singular number includes the plural number.

     Each Obligor severally waives notice, demand, presentment for payment,
notice of nonpayment, notice of intent to accelerate, notice of acceleration,
protest, notice of protest and the filing of suit and diligence in collecting
this Note and all other demands and notices, and consents and agrees that its
liabilities and obligations will not be released or discharged by any or all of
the following, whether with or without notice to it or any other Obligor, and
whether before or after the stated maturity hereof: (i) extensions of the time
of payment; (ii) renewals; (iii) acceptances of partial payments; (iv) releases
or substitutions of any collateral or any Obligor; and (v) failure, if any, to
perfect or maintain perfection of any security interest in any collateral. Each
Obligor agrees that acceptance of any partial payment will not constitute a
waiver and that waiver of any default will not constitute waiver of any prior or
subsequent default.

     This Note is governed by the laws of the Province of Alberta (exclusive of
any such laws that pertain to conflicts of laws). If any provision of this Note
is illegal or unenforceable, that illegality or unenforceability will not affect
the remaining provisions of this Note. BORROWER(S) AND LENDER AGREE THAT THIS
NOTE WILL BE PERFORMED IN DALLAS COUNTY, TEXAS, AND THAT SUCH COUNTY IS PROPER
VENUE FOR ANY ACTION OR PROCEEDING BROUGHT BY BORROWER(S) OR LENDER, WHETHER IN
CONTRACT, TORT, OR OTHERWISE. ANY ACTION OR PROCEEDING AGAINST BORROWER(S) MAY
BE BROUGHT IN ANY STATE OR FEDERAL COURT IN SUCH COUNTY TO THE EXTENT NOT
PROHIBITED BY APPLICABLE LAW. TO THE EXTENT PERMITTED BY APPLICABLE LAW,
BORROWER(S) HEREBY IRREVOCABLY (A) SUBMITS TO THE NONEXCLUSIVE JURISDICTION OF
SUCH COURTS, AND (B) WAIVES ANY OBJECTION IT MAY NOW OR HEREAFTER HAVE AS TO THE
VENUE OF ANY SUCH ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT OR THAT ANY
SUCH COURT IS AN INCONVENIENT FORUM.


                                 Exhibit 1.01-2
   26

BORROWER(S) AGREES THAT SERVICE OF PROCESS UPON IT MAY BE MADE BY CERTIFIED OR
REGISTERED MAIL, RETURN RECEIPT REQUESTED, AT ITS ADDRESS SPECIFIED BELOW.
LENDER MAY SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW AND MAY BRING ANY
ACTION OR PROCEEDING AGAINST BORROWER(S) OR WITH RESPECT TO ANY OF ITS PROPERTY
IN COURTS IN OTHER PROPER JURISDICTIONS OR VENUES.

     For purposes of this Note, any assignee or subsequent holder of this Note
will be considered the "Lender," and any successor or successors to Borrower
will be considered, jointly and severally, the "Borrower."

     Payment of this Note is secured pursuant to the Existing Security Agreement
and other Security Instruments.

     Debtor's signature below may delivered to Lender by facsimile transmission,
and any such facsimile signature shall be deemed for all purposes to constitute
an original, manually-executed signature and shall be fully binding to the same
extent as if it were in fact Debtor's original, manually- executed signature.

     NO COURSE OF DEALING BETWEEN BORROWER AND LENDER, NO COURSE OF PERFORMANCE,
NO TRADE PRACTICES AND NO EXTRINSIC EVIDENCE OF ANY NATURE MAY BE USED TO
CONTRADICT OR MODIFY ANY TERM OF THIS NOTE OR ANY OTHER LOAN DOCUMENT.

     THIS NOTE IS SUBJECT TO ALL OF THE TERMS AND CONDITIONS SET FORTH IN THE
LOAN AGREEMENT.

     THIS NOTE AND THE OTHER LOAN DOCUMENTS COLLECTIVELY REPRESENT THE FINAL
AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS BETWEEN THEM.

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.



                                 Exhibit 1.01-3
   27

     IN WITNESS WHEREOF, Borrower has executed this Note effective as of October
___ 1997.


                                          BORROWER:

                                          FLOTEK INDUSTRIES INC.,
                                             an Alberta Corporation
                                          7030 Empire Central Drive
                                          Houston,  TX 77040



                                          By: 
                                             --------------------------------
                                             William G. Jayroe, President and
                                               Chief Executive Officer



                                          By: 
                                             --------------------------------


                                          Name: 
                                               ------------------------------


                                          Title: 
                                                -----------------------------




                                 Exhibit 1.01-4
   28

                                  Schedule 2.04

                                   Conversion

     1.  Conversion Right. The Borrower hereby grants to the Lender the sole and
exclusive right and option (the "Conversion Right") to convert, at any time and
from time to time until 4:00 p.m. Vancouver, British Columbia, Canada time on
the maturity date of the Note, in whole or in part, the then-outstanding
principal amount of the Note (the "Principal Balance") into a maximum of
7,000,000 Shares at the price of CDN$0.15 per Share (the "Conversion Price"),
subject to adjustment as hereinafter provided.

     2.  Manner of Exercise of Conversion Right.

     (a) On each occasion on which the Lender desires to convert all or a
portion of the Principal Balance into Shares, the Lender shall deliver a written
notice (the "Notice of Exercise") to the Borrower specifying:

     (i) the amount of the Principal Balance to be converted, expressed in
     Canadian dollars; and

     (ii) , with respect to each Person in whose name the Lender wishes Shares
     to be issued, such Person's exact name, address, telephone number and
     social security number or taxpayer identification number and, if such
     Person is other than a natural person, the name of a natural person
     authorized to act on such Person's behalf.

     (b) Upon receipt of a Notice of Exercise, the Borrower shall promptly:

     (i) direct its transfer agent to issue one or more certificates
     representing the Shares into which the portion of the Principal Balance
     referenced in subsection (a)(i) above is then convertible to the respective
     Persons and in the respective amounts set forth in the Notice of Exercise;

     (ii) deliver such certificates to such Persons at the addresses specified
     in the Notice of Exercise; and

     (iii) if applicable, deliver to the Lender a check for any amount payable
     in lieu of fractional shares pursuant to Section 4 below.

     3.  Capital Adjustments.

     The Shares issuable upon conversion of part or all of the original
principal amount of the Note is subject to the following adjustments:

     (a)  Recapitalization, Reclassification and Succession. If any
recapitalization of the Borrower or reclassification of its Shares or any
merger or consolidation of the Borrower into or with a corporation or other
business entity, or the sale or transfer of all or substantially all of the
Borrower's assets or of any successor corporation's assets to any other
corporation or business entity (any such corporation or other              


                                 Schedule 2.04-1
   29

business entity's being included within the meaning of the term "successor
corporation") shall be effected at any time while any principal amount of the
Note remains outstanding then, as a condition of such recapitalization,
reclassification, merger, consolidation, sale or transfer, lawful and adequate
provision shall be made whereby the Lender thereafter shall have the right to
receive upon the conversion of the principal amount of the Note then outstanding
(at a given time, the "Principal Balance") and in lieu of the Shares immediately
theretofore issuable upon the conversion of the Principal Balance, such shares
of capital stock, securities or other property as may be issued or payable with
respect to or in exchange for a number of outstanding Shares equal to the number
of Shares immediately theretofore issuable upon the conversion of the Principal
Balance had such recapitalization, reclassification, merger, consolidation, sale
or transfer not taken place and, in each such case, the terms of the Loan
Agreement shall be applicable to the shares of capital stock or other securities
or property receivable upon the conversion of the Principal Balance after such
consummation.

     (b) Subdivision or Combination of Shares. If, at any time while any
principal amount of the Note remains outstanding, the Borrower shall subdivide
or combine its Shares, the number of Shares purchasable upon conversion of the
Principal Balance shall be proportionately adjusted.

     (c) Certain Dividends and Distributions. If, at any time while any
principal amount of the Note remains outstanding, the Borrower shall take a
record of the holders of Shares for the purpose of entitling them to receive a
dividend payable in, or other distribution of, Shares, then the number of Shares
purchasable upon conversion of the Principal Balance shall be adjusted to that
number determined by multiplying the number of Shares so purchasable immediately
prior to such record date by a fraction (i) the numerator of which shall be the
sum of (A) the total number of outstanding Shares immediately prior to such
record date and (B) the total number of Shares issuable pursuant to such
dividend or distribution, and (ii) the denominator of which shall be the total
number of Shares outstanding immediately prior to such record date.

     (d) Corresponding Conversion Price Adjustment. Whenever the number of
Shares purchasable upon the conversion of the Principal Balance is increased or
decreased as provided in subsections (b) or (c) above, the Conversion Price
shall be adjusted by multiplying the Conversion Price immediately prior to such
adjustment by a fraction, the numerator of which shall be the number of Shares
purchasable upon the conversion of the Principal Balance immediately prior to
such adjustment, and the denominator of which shall be the number of Shares
purchasable immediately thereafter.

     (e) Certain Shares Excluded. The number of Shares outstanding at any given
time for purposes of the adjustments set forth in this Section shall exclude any
shares then directly or indirectly held in the treasury of the Borrower.

     (f) Deferral and Cumulation of De Minimis Adjustments. The Borrower shall
not be required to make any adjustment of the Conversion Price pursuant to this
Section if the amount of such adjustment would be less than one percent (1%) of
the Conversion Price in effect immediately before the event that would otherwise
have given rise to such adjustment. In such case, however, any adjustment that
otherwise would have been required to be made shall be made at the time of and
together with the next subsequent adjustment which,



                                 Schedule 2.04-2
   30

together with any adjustment or adjustments so carried forward, shall amount to
not less than one percent (1%) of the Conversion Price in effect immediately
before the event giving rise to such next subsequent adjustment.

     (g) Duration of Adjusted Conversion Price. Following each computation or
readjustment of an adjusted Conversion Price as provided in this Section, the
new adjusted Conversion Price shall remain in effect until a further computation
or readjustment thereof is required.

     4.  Notices to Lender.

     (a) Notice of Record Date. In case:

             (i) the Borrower shall take a record of the holders of Shares (or
     other capital stock or securities at the time receivable upon the
     exercisable of the Principal Balance) for the purpose of entitling them to
     receive any dividend (other than a cash dividend payable out of earned
     surplus of the Borrower) or other distribution, or any right to subscribe
     for or purchase any shares of stock of any class or any other securities,
     or to receive any other right; or

             (ii) of any capital reorganization of the Borrower, any
     reclassification of the capital stock of the Borrower, any consolidation
     with or merger of the Borrower into another corporation, or any conveyance
     of all or substantially all of the assets of the Borrower to another
     corporation; or

             (iii) of any voluntary dissolution, liquidation or winding-up of
     the Borrower;

then, and in each such case, the Borrower shall mail or cause to be mailed to
the Lender a notice specifying, as the case may be, (1) the date on which a
record is to be taken for the purpose of such dividend, distribution or right,
and stating the amount and character of such dividend, distribution or right or
(2) the date on which such reorganization, reclassification, consolidation,
merger, conveyance, dissolution, liquidation or winding-up is to take place, and
the time, if any, is to be fixed, as of which the record holders of Shares shall
be entitled to exchange their Shares (or such other capital stock or securities)
for securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, conveyance, dissolution, liquidation or
winding-up. Such notice shall be mailed at least 30 days prior to the record
date therein specified or, if no record date shall have been specified, at least
30 days prior to such other specified date.

     (b) Notice of Adjustments. Whenever any Conversion Price shall be adjusted
pursuant to Section 3 hereof, the Borrower shall promptly deliver to the Lender
a certificate signed by its President or by any Vice President, and by its
Treasurer or any Assistant Treasurer or its Secretary or any Assistant
Secretary, setting forth in reasonable detail the event requiring the
adjustment, the amount of the adjustment, the method by which such adjustment
was calculated and the Conversion Price after giving effect to such adjustment.



                                 Schedule 2.04-3
   31

     5.  No Requirement to Issue Fractional Shares. The Borrower shall not be
required to issue fractional Shares upon conversion of part or all of the
Principal Balance pursuant to the Lender's exercise of the Conversion Right. In
lieu thereof, the Borrower shall be entitled to pay to the Lender in cash an
amount equal (to the nearest cent) to the appropriate fraction of the value
(which shall be the last reported sale price if a sale took place within 60 days
of the applicable Notice of Exercise or, if none, a deemed value of CDN$0.15 per
Share) of a Share on the date that the Borrower receives the Notice of Exercise.



                                 Schedule 2.04-4
   32

                                  Schedule 3.15

                                 Capitalization
                              as of October 7, 1997


                                                                                          
Common Shares Issued and Outstanding                                                  25,757,297

         Reserved for exercise of outstanding Warrants                                 3,274,000

         Reserved for exercise of outstanding Options                                  2,140,000

         Reserved for exercise of Options not yet approved(*)                            935,000
                                                                                     -----------
Common Shares Fully Diluted before Private Placement and                              32,106,297
         Related Matters Announced September 14, 1997


         Reserved for issuance in settlement of outstanding indebtedness               5,000,000

         Reserved for issuance in consideration of Turbeco option                      2,500,000

         Issuable as part of Unit Private Placement                                   11,666,667

         Reserved for issuance upon exercise of Warrants granted                      11,666,667
               as part of Unit Private Placement

         Reserved for issuance upon exercise of Detachable Warrants                    7,000,000
               granted as part of Convertible Loan Private Placement

         Reserved for issuance upon conversion of Convertible Loan                     7,000,000
               made as part of Convertible Loan Private Placement

         Reserved for finders' fees in connection with Unit Private                      808,333
               Placement and Convertible Loan Private Placement
                                                                                     -----------
Common Shares Fully Diluted After All of the Above                                    77,747,964


 (*) An option to purchase up to 300,000 shares is to be granted to William
     Jayroe in connection with his proposed employment agreement and, under that
     agreement, he may by meeting certain performance goals, become entitled to
     grants of additional options exercisable to purchase a maximum of an
     additional 600,000 shares. In addition, options to purchase up to an
     aggregate of an additional 35,000 shares are reserved for grants to 
     employees. These options are subject to acceptance by the Vancouver
     Stock Exchange.



                                  Schedule 4.11
   33

              Indebtedness to be Paid with the Proceeds of the Loan
                   (all amounts expressed in Canadian dollars)


                                                                 
Lender's Expenses in connection with the                
 September 18, 1997 TOSI, L. P. $410,200 loan                       undetermined
September 18, 1997 TOSI, L.P. loan                                      $410,200
Lender's Expenses specified in Section 4.05 hereof                  undetermined
Suppliers:                                              
  Downhole Products                                                      164,900
  BHP                                                                     89,700
  A-1 Carbide                                                             69,000
  Wallace Robertson                                                       40,020
  Karnin                                                                  10,000
  H & 0 Grindless                                                          9.000
                                                                     -----------
                                                        
  Total Suppliers                                                        382,620
Other Accounts Payable                                                   200,000
Working Capital                                         
 (including inventory)                                   remainder, if any, after payment of the above





                                  Schedule 4.16
   34

        Right of First Refusal with respect to Future Borrower Financings

     1.01 The Borrower will give written notice (in each case, a "Notice") to
the Lender of the terms of any further financing (in each case, a "Financing")
that it requires or proposes to obtain by way of a public or private offering of
its securities (including, without limitation, equity, debt or derivative
securities) during the twenty-four (24) months (the "Term") next following the
Closing Date.

     1.02 Each Notice will contain the material terms and conditions of the
proposed Financing, including without limitation the proposed price and the
nature and size thereof.

     1.03 The Lender will have the right of first refusal to provide up to 
37.5% (the "Lender's Proportionate Share") of any Financing during the Term.

     1.04 The right of first refusal must in each instance be exercised by the
Lender within thirty (30) days next following receipt of the applicable Notice
by giving the Borrower written notice (an "Exercise Notice') that the Lender
will provide the Lender's Proportionate Share of the Financing, in whole or in
part, on the terms set forth in the Notice.

     1.05 Immediately upon receipt of any Exercise Notice, the Borrower will:

     (a)  provide a copy of same to each of Marlin Investors, L.L.C. and Charles
          Dickinson (the "Other Rightholders"), who have been granted rights of
          first refusal pursuant to agreements (the "Other Agreements") made
          between the Other Rightholders and the Borrower in connection with the
          financing announced by the Borrower on September 14, 1997 to provide
          up to 50.0% and 12.5% (the "Other Rightholders' Proportionate
          Shares"), respectively, of any Financing proposed during the Term; and

     (b)  provide copies of the exercise notices (the "Other Exercise Notices")
          given to the Borrower by the Other Rightholders pursuant to the Other
          Agreements;

and in the event that the Borrower does not receive an Exercise Notice or one or
both of the Other Exercise Notices in respect of a Financing, the Borrower will
give notice (in each case a "Second Notice") to such effect to the Lender and/or
one or both of the Rightholders, as circumstances require.

     1.06 If the Lender fails to give an Exercise Notice within thirty (30) days
next following receipt of the applicable Notice or elect in an Exercise Notice
to provide less than the Lender's Proportionate Shares of such Financing, the
Borrower will then be free for a period of (3) months (subject to the rights of
the Other Rightholders to provide the Other Rightholders' Proportionate Shares
of such proposed Financing as a result of the timely giving of notice of their
intention to do so and their rights under the Other Agreements) to make other
arrangements to obtain the unfunded portion of the proposed Financing from



                                 Schedule 4.16-1
   35

another source, including the Other Rightholders, on the same terms or on terms
no less favorable to the Borrower than are set forth in the applicable Notice.

     1.07 In the event that one or both of the Other Rightholders elects not to
provide all such Other Rightholder's Proportionate Share of such Financing, the
Lender may, by further notice to the Borrower given not later than ten (10) days
after the Lender's receipt of the Other Exercise Notices or Second Notices, as
the case may be, elect to provide some or all of that portion of the Financing
(the "Remaining Financing") which one or both of the Other Rightholders (a
"Non-participating Rightholder") has not elected to provide; provided, however,
that if one of the Other Rightholders (the "Participating Rightholder") also
elects to provide some or all of the Remaining Financing, and if the additional
elections of the Lender and the Participating Rightholder are greater in the
aggregate than the Remaining Financing, then the Lender and the Participating
Rightholder shall share in the Remaining Financing pro rata according to their
percentage interests set forth herein.

     1.08 The failure by Lender in any one or more instances to provide all or
any portion of the Lender's Proportionate Share of any Financing shall not
deprive the Lender of its right of first refusal in any other instances.

     1.09 The right of first refusal granted hereunder is conditional upon
consummation of the Closing.

     1.10 The right of first refusal granted hereunder will not affect the
Borrower's right to obtain fiscal agency or investment banking services that it
requires or proposes to obtain during the Term, whether or not in connection
with any Financing or any proposed amalgamation, merger, acquisition, takeover,
plan of arrangement or other restructuring, including, without limitation, the
preparation of fairness opinions and the like.

     1.11 The Borrower will not amend the terms of or grant extensions of time
in respect of any rights of first refusal previously granted or which may
hereafter be granted to either of the Other Rightholders pursuant to the Other
Agreement without, at the option of the Lender, amending the terms of or
granting extensions of time in respect of the right of first refusal granted to
the Lender hereunder in the same manner and to the same extent as the Borrower
has agreed to amend the terms of one or both of the Other Agreements or to grant
any extension of time in respect of one or both of the Other Agreements.




                                 Schedule 4.16-2
   36

                                 PROMISSORY NOTE

October 16, 1997                                                  US$750,000.00

     FOR VALUE RECEIVED, FLOTEK INDUSTRIES INC., an Alberta corporation
("Borrower"), promises to pay to the order of TOSI, L.P., a Texas limited
partnership ("Lender"), on or before October 16, 1998, at its office at 3900
Thanksgiving Tower, 1601 Elm Street, Dallas, Texas 75201, or at such other
location as Lender may designate, in immediately available funds, SEVEN HUNDRED
FIFTY THOUSAND AND NO/100 UNITED STATES DOLLARS (US$750,000.00). Borrower will
also pay interest on the unpaid principal balance outstanding from time to time
at a fixed rate of ten percent (10%) per annum, payable quarterly in arrears.

     Interest will be computed on the basis of the actual number of days elapsed
and a year comprising 360 days, unless such calculation would result in a
usurious interest rate, in which case such interest will be calculated on the
basis of a 365 or 366 day year, as the case may be.

     All past due principal and interest on this Note will, at Lender's option,
bear interest at the maximum nonusurious rate of interest ("Highest Lawful
Rate") or, if applicable law does not provide for a maximum nonusurious rate of
interest, at a rate per annum equal to 18%.

     Borrower covenants to apply the total amount advanced by Lender hereunder
only in the manner set forth in that certain Convertible Loan Agreement of even
date herewith between Borrower and Lender (the "Loan Agreement"). Borrower
understands and acknowledges that Lender would not be willing to make the loan
evidenced hereby but for Borrower's covenant set forth in the immediately-
preceding sentence.

     All undefined capitalized terms used in this Note shall have the meanings
respectively ascribed to them in the Loan Agreement.

     In addition to all principal and accrued interest on this Note, Borrower
agrees to pay: (a) all reasonable costs and expenses incurred by or on behalf of
Lender and all owners and holders of this Note in attempting to collect this
Note through probate, reorganization, bankruptcy or any other proceeding; and
(b) reasonable attorneys fees if and when this Note is placed in the hands of an
attorney for collection.

     The outstanding principal amount of the Loan evidenced by this Note shall
be convertible into common shares of Borrower in the manner and to the extent
set forth in the Loan Agreement.



PROMISSORY NOTE MADE BY FLOTEK INDUSTRIES INC. IN FAVOR OF TOSI, L. P.
OCTOBER 16, 1997 - PAGE 1 OF 4
   37

     Borrower and Lender intend to conform strictly to applicable usury laws.
Therefore, the total amount of interest (as defined under applicable law)
contracted for, charged or collected under this Note will never exceed the
Highest Lawful Rate. If Lender contracts for, charges or receives any excess
interest, it will be deemed a mistake. Lender will automatically reform the
contract or charge to conform to applicable law and, if excess interest has been
received, Lender will either refund the excess to Borrower or credit the excess
on the unpaid principal amount of this Note. All amounts constituting interest
will be spread throughout the full term of this Note in determining whether
interest exceeds lawful amounts.

     The unpaid principal balance of this Note at any time will be the total
amount advanced by Lender, less the amount of all payments of principal.
Borrower may at any time pay the full amount of this Note without the payment of
any premium, penalty or fee.

     "Loan Document" means this Note and any document or instrument evidencing,
securing, guaranteeing or given in connection with this Note including, without
limitation, the Loan Agreement, the Warrant and the Registration Rights
Agreement. "Obligations" means all principal, interest and other amounts which
are or become owing under this Note or any other Loan Document. "Obligor" means
Borrower and any guarantor, surety, co-signer, or other person who may now or
hereafter be obligated to pay all or any part of the Obligations. Where
appropriate, the masculine gender includes the feminine and the neuter and the
singular number includes the plural number.

     Each Obligor severally waives notice, demand, presentment for payment,
notice of nonpayment, notice of intent to accelerate, notice of acceleration,
protest, notice of protest and the filing of suit and diligence in collecting
this Note and all other demands and notices, and consents and agrees that its
liabilities and obligations will not be released or discharged by any or all of
the following, whether with or without notice to it or any other Obligor, and
whether before or after the stated maturity hereof: (i) extensions of the time
of payment; (ii) renewals; (iii) acceptances of partial payments; (iv) releases
or substitutions of any collateral or any Obligor; and (v) failure, if any, to
perfect or maintain perfection of any security interest in any collateral. Each
Obligor agrees that acceptance of any partial payment will not constitute a
waiver and that waiver of any default will not constitute waiver of any prior or
subsequent default.

     This Note is governed by the laws of the Province of Alberta (exclusive of
any such laws that pertain to conflicts of laws). If any provision of this Note
is illegal or unenforceable, that illegality or unenforceability will not affect
the remaining provisions of this Note. BORROWER(S) AND LENDER AGREE THAT THIS
NOTE WILL BE PERFORMED IN DALLAS COUNTY, TEXAS, AND THAT SUCH COUNTY IS PROPER
VENUE FOR ANY ACTION OR PROCEEDING BROUGHT BY BORROWER(S) OR LENDER, WHETHER IN
CONTRACT, TORT, OR OTHERWISE. ANY ACTION OR PROCEEDING AGAINST BORROWER(S) MAY
BE BROUGHT IN ANY STATE OR FEDERAL COURT IN SUCH COUNTY TO THE EXTENT NOT
PROHIBITED BY APPLICABLE LAW. TO THE EXTENT PERMITTED BY APPLICABLE LAW,



PROMISSORY NOTE MADE BY FLOTEK INDUSTRIES INC. IN FAVOR OF TOSI, L. P.
OCTOBER 16, 1997 - PAGE 2 OF 4
   38

BORROWER(S) HEREBY IRREVOCABLY (A) SUBMITS TO THE NONEXCLUSIVE JURISDICTION OF
SUCH COURTS, AND (B) WAIVES ANY OBJECTION IT MAY NOW OR HEREAFTER HAVE AS TO THE
VENUE OF ANY SUCH ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT OR THAT ANY
SUCH COURT IS AN INCONVENIENT FORUM. BORROWER(S) AGREES THAT SERVICE OF PROCESS
UPON IT MAY BE MADE BY CERTIFIED OR REGISTERED MAIL, RETURN RECEIPT REQUESTED,
AT ITS ADDRESS SPECIFIED BELOW. LENDER MAY SERVE PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW AND MAY BRING ANY ACTION OR PROCEEDING AGAINST BORROWER(S) OR
WITH RESPECT TO ANY OF ITS PROPERTY IN COURTS IN OTHER PROPER JURISDICTIONS OR
VENUES.

     For purposes of this Note, any assignee or subsequent holder of this Note
will be considered the "Lender," and any successor or successors to Borrower
will be considered, jointly and severally, the "Borrower."

     Payment of this Note is secured pursuant to the Existing Security Agreement
and other Security Instruments.

     Debtor's signature below may delivered to Lender by facsimile transmission,
and any such facsimile signature shall be deemed for all purposes to constitute
an original, manually-executed signature and shall be fully binding to the same
extent as if it were in fact Debtor's original, manually-executed signature.

     NO COURSE OF DEALING BETWEEN BORROWER AND LENDER, NO COURSE OF PERFORMANCE,
NO TRADE PRACTICES AND NO EXTRINSIC EVIDENCE OF ANY NATURE MAY BE USED TO
CONTRADICT OR MODIFY ANY TERM OF THIS NOTE OR ANY OTHER LOAN DOCUMENT.

     THIS NOTE IS SUBJECT TO ALL OF THE TERMS AND CONDITIONS SET FORTH IN THE
LOAN AGREEMENT.

     THIS NOTE AND THE OTHER LOAN DOCUMENTS COLLECTIVELY REPRESENT THE FINAL
AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS BETWEEN THEM.

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.




PROMISSORY NOTE MADE BY FLOTEK INDUSTRIES INC. IN FAVOR OF TOSI, L. P.
OCTOBER 16, 1997 - PAGE 3 OF 4
   39

     IN WITNESS WHEREOF, Borrower has executed this Note effective as of October
16, 1997.


                                            BORROWER:

                                            FLOTEK INDUSTRIES INC.,
                                              an Alberta Corporation
                                            7030 Empire Central Drive
                                            Houston,  TX 77040



                                            By: /s/ WILLIAM G. JAYROE
                                               --------------------------------
                                               William G. Jayroe, President and
                                                 Chief Executive Officer



                                            By: /s/ SCOTT COOK
                                               --------------------------------


                                            Name: Scott Cook
                                                 ------------------------------

                                            Title: Vice President
                                                  -----------------------------


PROMISSORY NOTE MADE BY FLOTEK INDUSTRIES INC. IN FAVOR OF TOSI, L. P.
OCTOBER 16, 1997 - PAGE 4 OF 4