EXHIBIT 23.8



                    CONSENT OF INDEPENDENT PETROLEUM ENGINEER

I hereby consent to the incorporation by reference in this 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
July 24, 2003