Unit Corporation (NYSE: UNT) announced today that its wholly-owned
subsidiary, Superior Pipeline Company LLC, has completed the
installation and start-up of the Lone Tree Gas Processing Plant, located
in Hemphill County, Texas. The Lone Tree Plant is a turbo expander plant
with processing capacity of 50 million cubic feet (MMcf) per day. The
completion of the Lone Tree Plant increases the company’s current
Hemphill Processing Complex capacity to 100 MMcf per day. The Hemphill
Processing Complex, formally the Hemphill Gathering System, was
purchased in 2003. At that time, the system was gathering 9.3 MMcf per
day. Within the last seven years, the system has been expanded to
include four processing plants and 130 miles of associated gathering
lines in the Granite Wash trend of Hemphill and Roberts Counties, Texas.
Residue gas is delivered into Southern Star Pipeline and ONEOK Westex
Pipeline with a future outlet planned into Northern Natural Gas Company.
Natural gas liquids from the Hemphill Processing Complex are delivered
into ONEOK Hydrocarbon, LP.

Please direct commercial inquires about Superior Pipeline Company’s
expanded gathering and processing services in the Panhandle to Bill Ward
at (918) 477-5609 or bill.ward@superiorpipeline.com.

Unit Corporation is a Tulsa-based, publicly held energy company engaged
through its subsidiaries in oil and natural gas exploration, production,
contract drilling and natural gas gathering and processing. Unit’s
Common Stock is listed on the New York Stock Exchange under the symbol
UNT. For more information about Unit Corporation, visit its website at http://www.unitcorp.com.

Unit Corporation
David T. Merrill, 918-493-7700
Financial Officer & Treasurer