EXHIBIT 23.3

                 CONSENT OF INDEPENDENT PETROLEUM ENGINEER

I hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (Nos. 333-47917, 33-39471, 333-67810, 333-60470, and
333-60466) and in the Registration Statements on Form S-3 (Nos. 333-53336,
333-44932, 333-34018, and 333-89885) of Patterson-UTI Energy, Inc. and its
subsidiaries of information contained in my summary reserve reports relating to
the oil and natural gas reserves as of December 31, 2002, 2001 and 2000, which
appears in this Form 10-K.


                          /s/ M. BRIAN WALLACE
                         ----------------------
                         M. BRIAN WALLACE, P.E.

Dallas, Texas
February 5, 2003