Exhibit 10.5



                               PROMISSORY NOTE


$135,000                       Houston, Texas                  February 11, 2003


FOR VALUE  RECEIVED ON OR BEFORE  February  11,  2003,  the  undersigned  FLOTEK
INDUSTRIES,  INC.,  a Delaware  corporation  (hereinafter  called the  "Maker"),
promises  to pay to the  order of Jerry  D.  Dumas,  Sr.  or Nancy  Lagow  Dumas
(hereinafter called the "Payee"), at 7030 Empire Central Drive,  Houston,  Texas
77040 or at such other place as the Payee may designate in writing to the Maker,
in lawful  money of the  United  States of  America,  the  principal  sum of ONE
HUNDRED AND THIRTY-FIVE  THOUSAND AND NO/100 DOLLARS  ($135,000),  together with
interest  thereon from the date hereof until maturity at the rate of six percent
(6%) per annum.


THIS WRITTEN LOAN AGREEMENT  REPRESENTS THE FINAL AGREEMENT  BETWEEN THE PARTIES
AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS  BETWEEN
THE PARTIES.



FLOTEK INDUSTRIES, INC.


By:      /s/ Mark Kehnemund
         -----------------------------------
         Mark Kehnemund
         Chief Operating Officer/Chief Financial Officer



By:      /s/ Jerry D. Dumas, Sr.
         -----------------------------------
         Jerry D. Dumas, Sr.



By:      /s/ Nancy Lagow Dumas
         -----------------------------------
         Nancy Lagow Dumas