(Bloomberg) -- The unprecedented collapse in global oil markets is wreaking havoc in all corners of the North American crude industry, pushing shale drillers, deepwater-equipment haulers and oil-sand miners to desperate measures.In the space of less than an hour on Wednesday, a former high-flying shale operator and an offshore transport company filed for bankruptcy. A short time later, a Texas shale driller was reported to be in talks with restructuring advisers, while a Canadian crude producer warned it may shut an oil-sands mine.The depredation is evident from the Rocky Mountains to the deep seas off Rio de Janeiro as debt-laden companies struggle to survive on ever-shrinking streams of cash. Even before the Covid-19 outbreak crushed energy demand and global stockpiles swelled, many operators were already fatally flawed entities teetering on the brink.The latest casualty is Whiting Petroleum Corp., a champion of what was once the premier U.S. shale field. The company...
