<DOCUMENT>
<TYPE>EX-23.3
<SEQUENCE>6
<FILENAME>h01879exv23w3.txt
<DESCRIPTION>CONSENT OF M. BRIAN WALLACE, P.E.
<TEXT>
<PAGE>


                                                                    EXHIBIT 23.3


                   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
August 25, 2003

</TEXT>
</DOCUMENT>