Three companies have filed claims in federal bankruptcy court seeking more than $2.6 million in unpaid bills owed by Cook Inlet Energy LLC. Baker Hughes Oilfield Operations Inc., MI-SWACO, and Schlumberger Technology Corp. filed an involuntary bankruptcy petition against the Alaska-based subsidiary of Miller Energy Resources citing payment owed for goods, materials and services. The companies filed with the U.S. Alaska Bankruptcy Court in Anchorage on Thursday, but a summons was not issued to Cook Inlet Energy until Friday according to court documents.