Rig Summary

Patterson-UTI Drilling by Region      Rigs Operating
Appalachian      30
East & North Texas      21
Mid Continent      30
North Dakota      8
Rockies      13
South Texas      17
West Texas      50
Total U.S.      169
Canada      3
Total      172

The Rig Summary is intended as a service to our customers. Patterson-UTI does not warrant the accuracy or completeness of the content, which may not reflect real-time data. The Rig Summary information is not intended to be, and should not be used as, a basis for making an investment decision regarding Patterson-UTI securities.