Rig Summary

Patterson-UTI Drilling by Region      Rigs Operating
Appalachian      28
East & North Texas      18
Mid Continent      29
North Dakota      8
Rockies      13
South Texas      21
West Texas      42
Total U.S.      159
Canada      2
Total      161

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.