Osage Exploration and Development Inc. voluntarily filed for Chapter 11 relief in the U.S. Bankruptcy Court for the Western District of Oklahoma on Feb. 3, the company said Feb. 4.

The company focused on the horizontal Mississippian and Woodford plays in Oklahoma.

The case is No. 16-10308-SAH, and copies of most court filings are on the company’s website.

Osage Exploration and Development Inc. is based in San Diego.