Helmerich & Payne International Drilling Co., the wholly owned subsidiary of Tulsa, Okla.-based Helmerich & Payne Inc. (NYSE: HP), priced $500 million, in aggregate principal amount, of senior notes in a private placement, the company said March 12.

The 4.65% notes are due in 2025.

Net proceeds will support general corporate purposes including rig construction capex.

The offer is scheduled to close March 19.