1
                                                                    EXHIBIT 10.8

THE SECURITIES TO WHICH THIS AGREEMENT RELATES HAVE NOT BEEN REGISTERED UNDER
THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT") OR ANY
STATE SECURITIES LAWS, AND MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES OR
TO A U.S. PERSON (AS DEFINED IN REGULATION S UNDER THE 1933 ACT) WITHOUT
REGISTRATION UNDER THE 1933 ACT AND ANY APPLICABLE STATE SECURITIES LAWS,
UNLESS AN EXEMPTION FROM REGISTRATION IS AVAILABLE.


                    PRIVATE PLACEMENT SUBSCRIPTION AGREEMENT
   [Section 55(2)(4) - Securities Act - Corporate and Individual Subscribers]


THIS SUBSCRIPTION AGREEMENT made as of the 14th day of September, 1997

BETWEEN:

       FLOTEK INDUSTRIES INC., of 7030 Empire Central Drive, Houston, Texas,
       U.S.A.  77040  [Facsimile Number:  (713) 896-4511]

       (the "Issuer")

AND:

       MARLIN INVESTORS, L.L.C., in care of Trevor Turbidy, 1000 Louisiana,
       Suite 4900, Houston Texas  77002 [Facsimile Number: (______)
       ____________]

       (the "Subscriber")


WITNESSES THAT WHEREAS:

A.     The Issuer requires capital for its business and for working capital
       purposes; and

B.     The Subscriber wishes to subscribe for 9,333,333 Units at the
       Subscription Price of Cdn. $0.15 per Unit (the "Subscription Price") on
       the terms and conditions set forth in this Agreement;


THEREFORE in consideration of the premises and of the mutual covenants and
agreements set forth herein, the parties hereto covenant and agree as follows:

                                   ARTICLE 1
                         DEFINITIONS AND INTERPRETATION

Definitions

1.01   In this Agreement, including the recitals and schedules hereto, unless
the context otherwise requires:
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       (a)    "Closing" means the completion of the transactions contemplated
              by this Agreement;

       (b)    "Closing Date" means the fifth business day next following the
              day on which the Issuer receives written notice from the Exchange
              of final acceptance of the Issuer's filing in respect of the
              transactions contemplated by this Agreement;

       (c)    "Exchange" means the Vancouver Stock Exchange;

       (d)    "Executive Director" means the Executive Director appointed under
              the Securities Act;

       (e)    "Securities Act" means the Securities Act, S.B.C. 1985, c.83, as
              amended from time to time;

       (f)    "Securities Rules" means the Securities Rules, B.C. Reg. 479/95,
              as amended from time to time;

       (g)    "Share" means a common share in the capital stock of the Issuer;

       (h)    "Subscription Funds" means the funds paid by the Subscriber to
              the Issuer for Units to be purchased by the Subscriber pursuant
              to this Agreement;

       (i)    "Unit" means one Share and one Warrant;

       (j)    "Warrant" means a non-transferable share purchase warrant
              entitling the holder to purchase one additional Share for the
              Subscription Price at any time before 4:00 p.m. (Vancouver time)
              on the first anniversary of the date of this Agreement and
              thereafter for 115% of the Subscription Price at any time until
              4:00 p.m. (Vancouver time) on the second anniversary of the date
              of this Agreement.

Captions and Section Numbers

1.02   The captions, section numbers and article numbers appearing in this
Agreement are inserted for convenience of reference only and shall in no way
define, limit, construe or describe the scope or intent of this Agreement nor
in any way affect this Agreement.

Governing Law

1.03   This Agreement and all matters arising hereunder shall be governed by,
construed and enforced in accordance with the laws of British Columbia and all
disputes hereunder shall be referred to the courts of British Columbia.

Number and Gender

1.04   In this Agreement, wherever the context requires, words importing the
singular number shall include the plural and vice versa, words importing the
masculine gender shall include the feminine and neuter genders and words
importing persons shall include firms and corporations and vice versa.
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                                     - 3 -




Section References

1.05   Unless otherwise stated, a reference in this Agreement to a numbered or
lettered article, section, paragraph or clause refers to the article, section,
paragraph or clause bearing that number or letter in this Agreement.

Severability of Clauses

1.06   If any covenant or other provision of this Agreement is invalid, illegal
or incapable of being enforced by reason of any rule of law or public policy,
such covenant or other provision shall be severed; all other conditions and
provisions of this Agreement shall, nevertheless, remain in full force and
effect and no covenant or provision shall be deemed dependant upon any other
covenant or provision unless so expressed herein.

Currency

1.07   All references to dollar amounts in this Agreement are references to
Canadian funds (CDN$) unless otherwise indicated, and where for any purpose in
connection with this Agreement it is necessary to convert Canadian funds into
United States funds (US$), a deemed exchange rate of CDN$1.40 per US$1.00 shall
apply.


                                   ARTICLE 2
                            SUBSCRIPTION FOR SHARES

Subscription

2.01   The Subscriber hereby irrevocably subscribes for that number of Units
referenced on page one of this Agreement, agrees to pay the Issuer the
Subscription Funds therefor at the Closing on the terms and conditions set
forth in this Agreement, and agrees to advance the Subscription Funds in
accordance with Article 3.

Acceptance

2.02   The Issuer hereby accepts the Subscriber's subscription and agrees to
allot and issue the Shares and Warrants subscribed for hereunder to the
Subscriber on the Closing Date as fully paid and non-assessable, and to cause
certificates representing such Shares and Warrants to be delivered to the
Subscriber at the Closing; provided that if the Subscriber chooses not to be
present at the Closing, but has otherwise fulfilled all of the Subscriber's
obligations hereunder, including payment in full of the Subscription Funds, the
Subscriber's Units will be delivered to the Subscriber by hand, by courier or
by registered mail as the Issuer may deem reasonable in the circumstances.

Warrants

2.03   The terms and conditions which govern the Warrants will be set forth on
the certificates representing the Warrants and will contain, among other
things, provisions for exercise of the Warrants
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                                     - 4 -




and appropriate adjustments in the class, number and price of the Shares to be
issued on the exercise of the Warrants upon the occurrence of certain events,
including any subdivision, consolidation or reclassification of the Shares.

2.04   Subject to section 2.10, the issue of the Warrants will not restrict or
prevent the Issuer from obtaining any other debt or equity financing, or from
issuing additional securities or rights during the period within which the
Warrants are exercisable.

2.05   So long as the Issuer's common shares remain listed on the Exchange, the
Warrants may not be transferred without the consent of the Exchange, except
that the Subscriber may make an in kind distribution of the Warrants to its
members in proportion to their membership interests, provided that such members
take the Warrants subject to all the transfer restrictions set forth herein.

2.06   The Shares and Warrants and the certificates representing the Shares and
Warrants may be pledged to a lender to secure debt of the Subscriber.

Acknowledgement

2.07   The Subscriber acknowledges that none of the Units, the Shares or the
Warrants have been registered under the 1933 Act or under any state securities
or "blue sky" laws, and that they may not therefore be offered or sold in the
United States without registration under the 1933 Act and the securities laws
of all applicable states of the United States unless an exemption from
registration is available or registration is not required pursuant to
Regulation S under the 1933 Act, and, subject to any obligations it may have
pursuant to any registration rights which have been or may in the future be
granted by the Issuer to the Subscriber, the Issuer has no obligation or
present intention of filing a registration statement under the 1933 Act in
respect of the securities.

Right of First Refusal

2.08   The Issuer will give written notice (in each case, a "Notice") to the
Subscriber 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, but specifically excluding bank financing and any commercial line
of credit) during the forty-two (42) months (the "Term") next following the
Closing Date.

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

2.10   The Subscriber will have the right of first refusal to provide up to 50%
(the "Subscriber's Proportionate Share") of any Financing during the Term.

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

2.12   Immediately upon receipt of any Exercise Notice, the Issuer will:
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                                     - 5 -




       (a)    provide a copy of same to each of TOSI, L.P. 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 Issuer
              in connection with the financing announced by the Issuer on
              September 14, 1997 to provide up to 37.5% 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 Issuer by the Other Rightholders pursuant
              to the Other Agreements;

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

2.13   If the Subscriber fails to give an Exercise Notice within thirty (30)
days next following receipt of the applicable Notice or elects in an Exercise
Notice to provide less than the Subscriber's Proportionate Share of such
Financing, the Issuer will then be free for a period of three (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 another source, including the Other
Rightholders, on the same terms or on terms no less favourable to the Issuer
than are set forth in the applicable Notice.

2.14   In the event that one or both of the Other Rightholders elects not to
provide all of such Other Rightholder's Proportionate Share of such Financing,
the Subscriber may, by further notice to the Issuer given not later than ten
(10) days after the Subscriber'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 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 Subscriber and the Participating
Rightholder are greater in the aggregate than the Remaining Financing, then the
Subscriber and the Participating Rightholder shall share in the Remaining
Financing pro rata according to their percentage interests set forth herein.

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

2.16   The right of first refusal granted hereunder is conditional upon
completion of the subscription contemplated by this Agreement.

2.17   The right of first refusal granted hereunder will not affect the
Issuer'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.
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                                     - 6 -




2.18   No finder's fee will be payable in connection with any portion of any
Financing in respect of which the Subscriber exercises its right of first
refusal.


                                   ARTICLE 3
                         SUBSCRIPTION FUNDS AND CLOSING

Advance of Subscription Funds

3.01   The Subscriber will, concurrently with the execution and delivery of
this Agreement and the private placement documents described in subsection
4.02(h) of this Agreement, pay the Subscription Funds either to the Issuer or
to the Subscriber's solicitor "in trust", in which latter case such solicitor
will, in the absence of written instructions to the contrary, be deemed for all
purposes to have been irrevocably instructed by the Subscriber to pay the
Subscription Funds to the Issuer at the Closing.

Closing

3.02   The Closing will take place at the office of the Issuer at its address
first set forth above at 10:00 a.m. (local Houston time) on the Closing Date,
or at such other time and place as the parties may agree in writing; provided
that if there is a delay affecting the Issuer's ability to deliver certificates
representing the Shares and Warrants resulting from acts or omissions by or of
third parties or any other event of force majeure, then the Closing will take
place on a date specified by the Issuer by not less than two-days' prior
written notice to the Subscriber.

Withdrawal of Subscription

3.03   The Subscriber will have the right to cancel this Agreement by notice in
writing to the Issuer if Closing does not take place within six months next
following the date of this Agreement and the Issuer will have the right to
cancel this Agreement by notice in writing to the Subscriber if it is not
reasonably able to obtain written notice of final acceptance of its filing in
respect of the private placement contemplated hereby from the Exchange within
six months next following the date of this Agreement or if the Subscription
Funds are not paid by the Subscriber in accordance with section 3.01 within ten
days next following the date of this Agreement.

Subscription Funds May be Used by the Issuer Pending Regulatory Approval

3.04   Any Subscription Funds paid to the Issuer before the Closing Date may be
used by the Issuer for its corporate purposes pending Closing and any interest
income from such Subscription Funds shall be for the account of the Issuer.
Should Closing not take place because the Exchange has not accepted the
Issuer's filing in respect of the contemplated private placement within six
months next following the date of this Agreement, this Agreement shall, upon
receipt by the Issuer of notice of withdrawal pursuant to section 3.03, be
converted into a demand loan agreement and an amount equal to the Subscription
Funds shall thereafter be payable to the Subscriber on demand without interest.
Any interest income from the Subscription Funds shall be for the account of the
Issuer regardless of whether the private placement contemplated by this
Agreement is accepted by the Exchange.
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                                     - 7 -




Delivery of Certificates

3.05   The certificates representing the Shares and Warrants subscribed for
will be issued in the name of the Subscriber and will, in the absence of
written instructions from the Subscriber, be delivered by the Issuer to the
Subscriber at its address first set forth above.

Representation on the Board of Directors

3.06   At or before Closing, the Issuer will effect the appointment to its
board of directors and its Compensation Committee of a person designated by the
Subscriber and deliver to the Subscriber a certified copy of a resolution of
the directors of the Issuer appointing such person to the board of directors of
the Issuer and its Compensation Committee.


                                   ARTICLE 4
                   REPRESENTATIONS, WARRANTIES AND COVENANTS

Representations, Warranties and Covenants of the Issuer

4.01   The Issuer hereby represents and warrants to and covenants with the
Subscriber that:

       (a)    the Issuer is a company duly continued into and validly
              subsisting under the laws of Alberta;

       (b)    the Shares comprised in each Unit are, and will be, at the time
              of delivery to the Subscriber of certificates therefor, part of a
              class of shares that is presently listed and posted for trading
              on the Exchange;

       (c)    the Shares for which certificates are delivered to the Subscriber
              pursuant to this Agreement will, at the time of such delivery, be
              duly authorized, validly issued, fully paid and non-assessable;

       (d)    this Agreement has been duly authorized by all necessary
              corporate action on the part of the Issuer and constitutes a
              legal obligation of the Issuer enforceable in accordance with its
              terms;

       (e)    the Issuer is a "foreign issuer" as defined in Rule 902(f) of
              Regulation S under the United States Securities Act of 1933 (the
              "1933 Act") (in that it is a corporation incorporated under the
              laws of a country other than the United States and less than 50%
              of its outstanding voting securities are held of record by
              persons for whom a U.S. Address appears on the records of the
              Issuer and its transfer agent) and will be a "foreign issuer" as
              so defined at the time of Closing

       (f)    the authorized and issued capital of the Issuer and a description
              of all securities allotted or otherwise reserved for issuance (on
              a fully diluted basis) by the Issuer are set forth in Schedule
              "A" hereto;
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       (g)    the Issuer is the registered and beneficial owner of all the
              issued and outstanding shares in the capital of Petrovalve
              International Inc. and 98% of the issued and outstanding shares
              in the capital of Petrovalve International (Barbados) Inc. free
              and clear of all liens, charges, encumbrances and security
              interests and other rights of others of any kind or nature
              whatsoever (including assignments, voting agreements, voting
              trusts, shareholder agreements, rights of first refusal and
              rights under proxies);

       (h)    except for the Units to be issued to the Subscriber pursuant to
              this Agreement and any securities which may be issued pursuant to
              or in connection with that certain loan agreement (the "Loan
              Agreement") made as of September 14, 1997 between the Issuer and
              TOSI, L.P., and except as disclosed in Schedule "A" hereto, there
              are no outstanding rights, plans, options, warrants, conversion
              rights or agreements for the purchase or acquisition from the
              Issuer of any shares or any securities convertible to shares of
              the Issuer other than as set forth in the Issuer's financial
              statements;

       (i)    there are no pending or threatened claims against the Issuer
              alleging that the conduct of the Issuer's business infringes or
              conflicts with the rights of others under patents, trademarks,
              copyrights, and trade secrets and, to the best of the Issuer's
              knowledge, no reasonable basis exists for belief that any such
              claim is probable or capable of successful exertion;

       (j)    to the best of the Issuer's knowledge, the Issuer's business as
              now conducted and as proposed to be conducted does not infringe
              or conflict with the rights of others, including rights under
              patents, trademarks, copyrights, trade secrets and other
              industrial or intellectual property;

       (k)    the Issuer owns or possesses all of the patents, copyrights,
              trademarks, trade names, service marks, licenses, permits,
              regulatory approvals and other rights necessary for the operation
              of its businesses as now conducted or as proposed to be
              conducted;

       (l)    the Issuer and Petrovalve International Inc. are duly
              incorporated and validly subsisting under the laws of the
              Province of Alberta, and Petrovalve International (Barbados) Inc.
              is duly incorporated and validly subsisting under the laws of
              Barbados;

       (m)    the Issuer does not have any material assets located in any
              jurisdiction other than Texas except for assets owned by
              Petrovalve International Inc. which are located in Alberta;

       (n)    the Issuer has the power and authority to enter into and perform
              its obligations under this Agreement and all instruments and
              agreements delivered by the Issuer pursuant hereto;

       (o)    there are no claims, actions, suits or proceedings pending or
              threatened against or affecting the Issuer at law or in equity
              which would result in any material adverse change in the
              business, operations, prospects, properties, assets or
              conditions, financial or otherwise, of the Issuer, or in the
              ability of the Issuer to perform its obligations under this
              Agreement or any agreement or instrument delivered pursuant
              hereto, and the Issuer is not aware of any existing grounds on
              which any claim might be made or any such
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                                     - 9 -




              action, suit or proceeding might be commenced with any reasonable
              likelihood of success;

       (p)    neither the execution nor the delivery of this Agreement or any
              agreements or instruments delivered pursuant hereto, nor the
              performance thereof, conflicts with, or results or will result in
              any breach of, or constitutes a default under, any of the
              provisions of the constating documents of the Issuer or any
              agreements or instrument to which the Issuer is a party or by
              which the Issuer or any of its property and assets are bound;

       (q)    no event has occurred which constitutes, or with notice or lapse
              of time or both would constitute, an "Event of Default", as that
              phrase is defined in the Loan Agreement;

       (r)    the Issuer has accurately prepared and timely filed all income
              tax returns and other tax returns which are required to be filed,
              and have paid or made provisions for the payment of, all taxes
              which have or may have become due pursuant to said returns or
              pursuant to any assessment which has been or may be received from
              any taxing authority for the period through the date of this
              Agreement;

       (s)    the Issuer's financial statements have been prepared in
              accordance with generally accepted accounting principles applied
              on a basis consistent with prior years, are true and
              substantially correct in every material respect and present
              fairly and accurately the financial condition and position of the
              Issuer as at their respective dates; and

       (t)    since May 31, 1997:

              (i)    no dividends of any kind or other distribution on any
                     shares have been declared or paid by the Issuer;

              (ii)   there has been no material adverse change in the financial
                     condition or position of the Issuer and no damage, loss or
                     destruction materially affecting the Issuer or its assets
                     or its right or capacity to carry on business;

              (iii)  the Issuer has conducted its business in their usual and
                     normal manner;

              (iv)   the Issuer has not waived or surrendered any right of
                     material value;

       (u)    the information contained in the Issuer's most recently filed
              Form 20F Annual Report is true and substantially correct in every
              material respect;

       (v)    the Issuer and its subsidiaries are currently meeting their
              obligations under that certain joint venture agreement made as of
              June 17, 1991 between Alberta Research Council and Rod Pump
              Specialty Valve Ltd., and no royalties are due to Alberta
              Research Council under that agreement.
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                                     - 10 -




Representations, Warranties and Covenants of Subscriber

4.02   The Subscriber hereby represents and warrants to and covenants with the
Issuer that:

       (a)    it is a "U.S. Person", as defined in Regulation S under the
              Securities Act of 1933 (United States) (as amended) (the "1933
              Act");

       (b)    it has such knowledge and experience in financial and business
              matters as to be capable of evaluating the merits and risks of
              the investment and it is able to bear the economic risk of loss
              of the investment;

       (c)    it is purchasing the Shares and Warrants for investment only and
              not with a view to resale or distribution and, in particular, it
              has no intention to distribute (subject to any distribution it
              might make pursuant to section 2.5), either directly or
              indirectly, any of the Shares or Warrants in the United States or
              to "U.S. Persons"; provided however that the Subscriber may sell
              or otherwise dispose of any of the Shares or Warrants pursuant to
              registration thereof pursuant to the 1933 Act and any applicable
              State securities laws, or pursuant to an exemption from such
              registration requirements or if registration is not required
              pursuant to Regulation S under the 1933 Act (at that time
              obtaining);

       (d)    it understands that the Shares and Warrants have not been and
              will not be registered under the 1933 Act and that the sale
              contemplated hereby is being made in reliance on an exemption
              from such registration requirement;

       (e)    it is an "accredited investor" as defined in Rule 501 of
              Regulation D under the 1933 Act and, accordingly, satisfies one
              or more of the categories indicated below (PLEASE PLACE AN "X" ON
              THE APPROPRIATE LINE):

              Category 1.   A "bank" as defined under Section (3)(a)(2)
- -------                     of the 1933 Act or savings and loan association or
                            other institution as defined in Section 3(a)(5)(A)
                            of the 1933 Act acting in its individual or
                            fiduciary capacity; a broker dealer registered
                            pursuant to Section 15 of the Securities Exchange
                            Act of 1934 (the "1934 Act"); an insurance Issuer
                            as defined in Section 2(13) of the 1933 Act; an
                            investment Issuer registered under the Investment
                            Issuer Act of 1940 (United States)or a business
                            development Issuer as defined in Section 2(a)(48)
                            of such act; a Small Business Investment Issuer
                            licensed by the U.S. Small Business Administration
                            under Section 301(c) or (d) of the Small Business
                            Investment Act of 1958 (United States); a plan with
                            total assets in excess of U.S.$5,000,000
                            established and maintained by a state, a political
                            subdivision thereof, or an agency or
                            instrumentality of a state or a political
                            subdivision thereof, for the benefit of its
                            employees; an employee benefit plan within the
                            meaning of the Employee Retirement Income Security
                            Act of 1974 (United States) whose investment
                            decisions are made by a plan fiduciary, as defined
                            in Section 3(21) of such
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                                     - 11 -




                            act, which is either a bank, savings and loan
                            association, insurance Issuer or registered
                            investment adviser or, if the employee benefit plan
                            has total assets in excess of U.S.$5,000,000 or, if
                            a self-directed plan, whose investment decisions
                            are made solely by persons that are accredited
                            investors;

              Category 2.   A private business development company as defined
- -------                     in section 202(a)(22) of the Investment Advisers
                            Act of 1940 (United States);

              Category 3.   An organization described in Section 501(c)(3) of
- -------                     the United States Internal Revenue Code,
                            corporation, Massachusetts or similar business
                            trust or partnership, not formed for the specific
                            purpose of acquiring the Securities, with total
                            assets in excess of US $5,000,000;

              Category 4.   A director, executive officer, or general partner
- -------                     of the Issuer;

              Category 5.   A natural person whose individual net worth, or
- -------                     joint net worth with that person's spouse, on the
                            date of purchase exceeds US $1,000,000;

              Category 6.   A natural person who had an individual income in
- -------                     excess of US $200,000 in each of the two most
                            recent years or joint income with that person's
                            spouse in excess of US $300,000 in each of those
                            years and has a reasonable expectation of reaching
                            the same income level in the current year;

              Category 7.   A trust with total assets in excess of
- -------                     U.S.$5,000,000, not formed for the specific purpose
                            of acquiring the Securities, whose purchase is
                            directed by a sophisticated person as described in
                            Rule 506(b)(2)(ii) under the 1933 Act; or

  X           Category 8.   An entity in which all of the equity owners satisfy
- -------                     the requirements of one or more of the foregoing
                            categories such that they are all "accredited
                            investors";

       (f)    it acknowledges that it has not purchased the Shares and Warrants
              as a result of any form of general solicitation or general
              advertising including advertisements, articles, notices or other
              communications published in any newspaper, magazine or similar
              media or broadcast over radio, or television, or any seminar or
              meeting whose attendees have been invited by general solicitation
              or general advertising;

       (g)    it agrees that if it decides to offer, sell or otherwise transfer
              any of the Shares, it will not offer, sell or otherwise transfer
              any of such Shares, directly or indirectly, unless:
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                                     - 12 -




              (i)    the sale is to the Issuer;

              (ii)   the sale is made outside the United States in a
                     transaction meeting the requirements of Rule 904 of
                     Regulation S under the 1933 Act and in compliance with
                     applicable local laws and regulations;

              (iii)  the sale is made pursuant to the exemption from the
                     registration requirements under the 1933 Act provided by
                     Rule 144 thereunder, if available, and in accordance with
                     any applicable state securities or "Blue Sky" laws;

              (iv)   the Shares are sold in a transaction that does not require
                     registration under the 1933 Act or any applicable U.S.
                     state laws and regulations governing the offer and sale of
                     securities, and it has prior to such sale furnished to the
                     Issuer an opinion of counsel reasonably satisfactory to
                     the Issuer; or

              (v)    such sale is made under a registration statement or
                     prospectus filed by the Issuer, including any registration
                     statement or prospectus filed by the Issuer pursuant to
                     any registration rights which have been or may in the
                     future be granted by the Issuer to the Subscriber;

       (h)    intentionally deleted.; and

       (i)    it understands and acknowledges that upon the issuance thereof,
              and until such time as the same is no longer required under the
              applicable requirements of the 1933 Act or applicable U.S. State
              laws and regulations, the certificates representing any of the
              Shares will bear a legend in substantially the following form:

       "THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN AND WILL NOT BE
       REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED
       (THE "1933 ACT").  THE HOLDER HEREOF, BY PURCHASING SUCH SECURITIES,
       AGREES FOR THE BENEFIT OF THE ISSUER THAT SUCH SHARES MAY BE OFFERED,
       SOLD, PLEDGED OR OTHERWISE TRANSFERRED ONLY (a) TO THE ISSUER, (b)
       OUTSIDE THE UNITED STATES IN ACCORDANCE WITH RULE 904 OF REGULATION S
       UNDER THE 1933 ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES
       LAW, (c) PURSUANT TO THE EXEMPTION FROM THE REGISTRATION REQUIREMENTS
       UNDER THE 1933 ACT PROVIDED BY RULE 144 THEREUNDER, IF AVAILABLE, AND IN
       ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS, OR (d) IN A
       TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE 1933 ACT OR ANY
       APPLICABLE STATE LAWS AND REGULATIONS GOVERNING THE OFFER AND SALE OF
       SECURITIES, AND THE HOLDER HAS, PRIOR TO SUCH SALE, FURNISHED TO THE
       ISSUER AN OPINION OF COUNSEL, OF RECOGNIZED STANDING, OR OTHER EVIDENCE
       OF EXEMPTION, REASONABLY SATISFACTORY TO THE ISSUER.  DELIVERY OF THIS
       CERTIFICATE MAY NOT CONSTITUTE "GOOD DELIVERY" IN SETTLEMENT OF
       TRANSACTIONS ON STOCK EXCHANGES IN CANADA; A NEW CERTIFICATE, BEARING NO
       LEGEND, DELIVERY OF WHICH WILL
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                                     - 13 -




       CONSTITUTE "GOOD DELIVERY", MAY BE OBTAINED FROM THE REGISTRAR AND
       TRANSFER AGENT OF THE ISSUER UPON DELIVERY OF THIS CERTIFICATE AND A
       DULY EXECUTED DECLARATION, IN A FORM SATISFACTORY TO THE ISSUER AND ITS
       REGISTRAR AND TRANSFER AGENT, TO THE EFFECT THAT THE SALE OF THE
       SECURITIES REPRESENTED HEREBY IS BEING MADE IN COMPLIANCE WITH RULE 904
       OF REGULATION S UNDER THE 1933 ACT AND IN ACCORDANCE WITH APPLICABLE
       STATE SECURITIES LAWS."

       provided that if the Shares are being sold under clause (g)(ii) above,
       the legend may be removed by providing a declaration to the registrar
       and transfer agent of the Issuer in the following form or in such other
       form as the Issuer may reasonably prescribe from time to time;

       "The Undersigned (A) acknowledges that the sale of the securities to
       which this declaration relates is being made in reliance on Rule 904 of
       Regulation S under the United States Securities Act of 1933, as amended
       (the "1933 Act") and (B) certifies that:  (1) the seller is not an
       affiliate of the Issuer as defined in the 1933 Act (other than solely by
       virtue of his position as an officer or director of the Issuer); (2) the
       offer of such securities was not made to a person in the United States
       and either (a) at the time the buy order was originated, the buyer was
       outside the United States"; or (b) the transaction was executed on or
       through the facilities of the Vancouver Stock Exchange or any other
       designated offshore securities market and neither the seller nor any
       person acting on its behalf knows that the transaction has been
       pre-arranged with a buyer in the United States; (3) neither the seller
       nor any affiliate of the seller nor any person acting on its or their
       behalf has engaged or will engage in any directed selling efforts in
       connection with the offer and sale of such securities; (4) the sale is
       bona fide and not for the purpose of "washing off" the resale
       restrictions imposed because the securities are "restricted securities"
       (as such term is defined in Rule 144(a)(3) under the 1933 Act); (5) the
       seller does not intend to replace the securities sold in reliance on
       Rule 904 of the 1933 Act with fungible unrestricted securities; and (6)
       the contemplated sale is not a transaction, or part of a series of
       transactions which, although in technical compliance with Regulation S,
       is part of a plan or scheme to evade the registration provisions of the
       1933 Act.  Terms used herein have the meanings given to them by
       Regulation S under the 1933 Act."

       (j)    it consents to the Issuer making a notation on its records or
              giving instruction to the registrar and transfer agent of the
              Issuer in order to implement the restrictions on transfer set
              forth and described herein;

       (k)    it, if an individual, is a resident of the state or other
              jurisdiction in its address on the signature page of the
              Subscription Agreement or, if the Subscriber is not an individual,
              the office of the Subscriber at which the Subscriber received and
              accepted the offer to purchase the Shares is the address set forth
              in the Subscription Agreement;

       (l)    the Subscriber is purchasing the Units subscribed for pursuant to
              this Agreement as principal for its own account and not for the
              benefit of, or with a view to immediate
   14

                                     - 14 -




              resale or other distribution to, any other person except a person
              (i) whose aggregate investment in the Subscriber (and such
              person's corresponding entitlement to Units) is not less than CDN
              $97,000 (ii) who is an "accredited investor";

       (m)    the securities being purchased by the Subscriber pursuant to this
              Agreement have an aggregate acquisition cost to the Subscriber of
              not less than CDN $97,000;

       (n)    the Subscriber understands that the trade contemplated by this
              Agreement is being conducted under the exemption set out in
              Section 55(2)(4) of the Securities Act and in accordance with the
              Exchange's Policy No. 16, as revised and supplemented, and that,
              accordingly:

              (i)    it is restricted from using most of the civil remedies
                     otherwise available under the Securities Act;

              (ii)   it may not receive information that would otherwise be
                     required to be provided to it under the Securities Act and
                     Securities Rules;

              (iii)  the Issuer is relieved from certain obligations that would
                     otherwise apply under the Securities Act and Securities
                     Rules;

              (iv)   the Securities Rules provide that the first trade by the
                     Subscriber in such Units or any part thereof will be deemed
                     to be a "distribution", as that term is defined in the
                     Securities Act unless, among other things, twelve months
                     have elapsed from the date of execution of this Agreement
                     by the Issuer and that, as a result, the Subscriber is
                     prohibited from disposing of such Units or any part thereof
                     for such period of twelve months unless the Subscriber
                     files a prospectus with the Executive Director in
                     accordance with the provisions of the Securities Act or
                     otherwise qualifies the disposition of such Units or any
                     part thereof pursuant to an exemption set out in the
                     Securities Act or Securities Rules;

       (o)    the Subscriber is not aware of any advertisement of the securities
              and the Subscriber's usual business does not involve trading in
              securities as those terms are defined in the Securities Act;

       (p)    the Subscriber validly subsists under the laws of the State of
              Delaware and has the legal capacity and competence to execute this
              Agreement, and all necessary approvals by directors and
              shareholders of the Subscriber have been given to authorize the
              execution and delivery of this Agreement by the Subscriber;

       (q)    the Subscriber is not purchasing the Units as a result of having
              any material information about the Issuer's affairs which has not
              been generally disclosed or as a result of any advertisement in
              printed media of general and regular paid circulation, radio or
              television, or as a result of any oral or written representation
              by any person in addition to or contrary to the representations
              set forth in materials published by the Issuer, including any
              offering memorandum;
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                                     - 15 -




       (r)    the Subscriber will, concurrently with execution of this
              Agreement, execute and deliver to the Issuer a Form Appendix 16A
              -  Private Placement Questionnaire and Undertaking;

       (s)    the Subscriber has been provided with all material and information
              requested by it or by others representing it, including
              information requested to verify information furnished, and there
              have been direct communications between the Subscriber and
              representatives of the Issuer;

       (t)    there has been made available to both the Subscriber and its
              advisors the opportunity to ask questions of, and to receive
              answers from, a representative of the Issuer concerning the terms
              and conditions of this investment and to obtain financial
              information to verify the accuracy of the information given;

       (u)    no person has made to the Subscriber any written or oral
              representations that any person will purchase the Subscriber's
              Units, Shares or Warrants, or any of them, that any person will
              refund any portion of the Subscription Funds, as to the future
              price or value of the Shares, or that the Shares will be listed
              and posted for trading or otherwise quoted on any exchange or
              quotation system other than the Exchange.

Legending of Certificates

4.03   The certificates representing any Shares issued hereunder and any Shares
issued upon exercise of any Warrants will bear an endorsement to the following
effect:

       "The securities represented by this certificate are subject to a hold
       period and may not be traded in British Columbia until the expiry of the
       hold period, except as permitted by the Securities Act (British
       Columbia) and rules made under the Act.  The hold period expires at
       12:00 a.m. (midnight) on September 14, 1998."

4.04   The certificates representing any Warrants issued hereunder and any
Shares issued upon exercise of any Warrants will bear an endorsement or legend
as set forth in subsection 4.02(i).


                                   ARTICLE 5
                               GENERAL PROVISIONS

Time

5.01   Time is of the essence of this Agreement and of every part hereof.
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                                     - 16 -




Notices

5.02   Unless otherwise provided herein, any notice, payment or other
communication to a party under this Agreement may be made, given or served by
hand delivery or by registered mail postage prepaid and addressed to the
parties at their respective addresses set forth above.  Any written notice,
payment or other communication delivered personally shall be deemed to have
been given or made at the time of such delivery.  Any notice, payment or other
communication so mailed shall be deemed to have been given or made on the fifth
business day following its mailing.  In the event of a postal strike affecting
mail delivery, any notice by mail shall be deemed to have been given when
actually received.  Each party may change their address for service at any time
by providing notice in writing of such change to the other party in accordance
herewith.

Entire Agreement

5.03   This Agreement constitutes the entire agreement between the parties and
supersedes all previous negotiations, communications, agreements or
understandings between the parties in any way relating to the subject matter
hereof, including without limitation all negotiations, communications,
agreements or understandings respecting any other private placement or related
matter.  It is expressly understood and agreed that the Issuer has made not
representations, inducements, warranties or promises concerning this Agreement
or the matters referred to herein which are not embodied in this Agreement.

Further Documents

5.04   Each party hereto will execute, deliver and undertake such other
documents, transfers, deeds, assurances and procedures as are in the opinion of
counsel for the Issuer necessary for the purpose of giving effect to or
completing the transactions contemplated by this Agreement.

Assignment

5.05   Neither this Agreement nor any of the Subscriber's rights hereunder may
be assigned by the Subscriber without the prior written consent of the Issuer.

Effective Date

5.06   This Agreement shall be dated as of and shall be effective from and
after the date first set forth above.

Regulatory Approval and Enurement

5.07   The obligations of the parties hereunder are subject to receipt of all
required regulatory acceptances and approvals, including written notice of
final acceptance of the Issuer's filing in respect of the transactions
contemplated by this Agreement by the Exchange, and thereafter this Agreement
shall enure to the benefit of and shall be binding upon the parties hereto and
their respective successors.
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                                     - 17 -




Execution in Counterparts

5.08   This Agreement may be executed in counterparts, each of which shall be
deemed to be an original and all of which together shall be deemed to form one
and the same document.


IN WITNESS WHEREOF this Agreement has been executed by the Issuer and the
Subscriber as of the date first set forth above.



FLOTEK INDUSTRIES INC.
Per:



/s/ BILL JAYROE                            
- ----------------------------
Authorized Signatory


MARLIN INVESTORS, L.L.C.
Per:



/s/ WILLIAM R. ZIEGLER
- ----------------------------
Authorized Signatory