<DOCUMENT>
<TYPE>EX-23.8
<SEQUENCE>5
<FILENAME>h06337a3exv23w8.txt
<DESCRIPTION>CONSENT OF M. BRIAN WALLACE, P.E.
<TEXT>
<PAGE>
                                                                    Exhibit 23.8

                    CONSENT OF INDEPENDENT PETROLEUM ENGINEER


I hereby consent to the incorporation by reference in this Amendment No. 3 to
Registration Statement on Form S-4 of Patterson-UTI Energy, Inc., and its
subsidiaries of information contained in my summary reserve reports appearing in
the Patterson-UTI Energy, Inc. Annual Report on Form 10-K for the year ended
December 31, 2002, relating to the oil and gas reserves as of December 31, 2000,
2001 and 2002.


                                             /s/ M. Brian Wallace
                                             -----------------------------------
                                             M. Brian Wallace


Dallas, Texas

December 9, 2003


</TEXT>
</DOCUMENT>