<DOCUMENT>
<TYPE>EX-23.8
<SEQUENCE>7
<FILENAME>h06337a1exv23w8.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. 1 to
Registration Statement 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


October 7, 2003


</TEXT>
</DOCUMENT>