Oil at $30 a barrel is blowing a hole in the insurance that U.S. shale drillers bought to protect themselves against a crash. Companies including Marathon Oil Corp., Noble Energy Inc., Callon Petroleum Inc., Pioneer Natural Resources Co., Rex Energy Corp. and Bonanza Creek Energy Inc. used a strategy known as a three-way collar that doesn’t guarantee a minimum price if oil falls below a certain level, company records show. While three-ways can be cheaper than other hedges, they leave drillers exposed to sharp declines. “At the time people hedged, they did it without thinking that oil would go to $28,” said Thomas Finlon, director of Energy Analytics Group LLC in Jupiter, Florida. “They didn’t have a realistic view about whether the market would crumble or not.” The three-way hedges risk worsening a cash shortfall for companies trying to survive the worst oil crash in 30 years. The insurance […]