(June 10, 2019, 9:34 AM EDT) -- WILMINGTON, Del. — Hydraulic fracturing company White Star Petroleum Holdings LLC filed for Chapter 11 bankruptcy in the U.S. Bankruptcy Court for the District of Delaware on May 28, posting negative working capital of $70 million due to what is says are “volatile market conditions” that have hurt independent operators in the Mississippian Lime formation in Oklahoma (In re: White Star Petroleum Holdings LLC, No. 19-11179, D. Del. Bkcy.)....