Press Release

Chaparral Energy

Chaparral Energy to Host Bondholder Conference Call to Discuss Calumet Oil Company Acquisition

OKLAHOMA CITY – September 20, 2006 – Chaparral Energy, Inc. (Bloomberg: CHAPAR) (“Chaparral”) announced today that the Company has scheduled a conference call for its bondholders to be held at 10:00 a.m. Eastern time (9:00 a.m. Central) on Monday, September 25, 2006 to discuss Chaparral's agreement to acquire Calumet Oil Company. Bondholders are requested to call DRG&E at (713) 529-6600 by September 22nd in order to obtain a dial-in number for the call.

What: Chaparral Energy Conference Call to Discuss Calumet Oil Acquisition
When: Monday, September 25, 2006 at 10:00 a.m. Eastern
How: Please call DRG&E at 713-529-6600 before September 22, 2006 to obtain the conference call phone number

For those who cannot listen to the live call, a telephonic replay will be available through Monday, October 2, 2006 and may be accessed by calling 303-590-3000 and using the pass code 11071835#.

Chaparral Energy, Inc. is an independent oil and natural gas production and exploitation company, headquartered in Oklahoma City, Oklahoma. Since its inception in 1988, the company has increased reserves and production primarily by acquiring and enhancing properties in its core areas of the Mid-Continent and the Permian Basin. Beginning in 2000, Chaparral expanded its geographic focus to include East Texas, North Texas, the Gulf Coast and the Rocky Mountains and also increased the percentage of capital expenditures allocated to developmental drilling.

Contacts:
Chaparral Energy, Inc.
Joe Evans, EVP & CFO
405-478-8770

DRG&E
Ken Dennard, Managing Partner
713-529-6600