Warren Resources Inc. (WRES) opened an offer to exchange about $230.4 million of outstanding senior notes, the company said June 22.

The 0.09% notes are due in 2022, and were previously issued in a private placement. They will be exchanged for an identical amount of new, identical notes that have been registered.

The exchange will fulfill the private placement notes’ registration obligation, and a filing will be made with the Securities and Exchange Commission.

The exchange offer will expire on July 22. The exchange agent is U.S. Bank NA.

New York-based Warren Resources Inc. acquires and develops oil in California’s Los Angeles Basin and natural gas in the Marcellus Shale and Wyoming’s Washakie Basin.