US energy dominance will squeeze Opec into 2020s

Precision Drilling oil rig operators install a bit guide on the floor of a Royal Dutch Shell Plc oil rig near Mentone, Texas, U.S., on Thursday, March 2, 2017. Exxon Mobil Corp., Royal Dutch Shell and Chevron Corp., are jumping into American shale with gusto, planning to spend a combined $10 billion this year, up from next to nothing only a few years ago. Photographer: Bloomberg/Bloomberg
Precision Drilling oil rig operators install a bit guide on the floor of a Royal Dutch Shell Plc oil rig near Mentone, Texas, U.S., on Thursday, March 2, 2017. Exxon Mobil Corp., Royal Dutch Shell and Chevron Corp., are jumping into American shale with gusto, planning to spend a combined $10 billion this year, up from next to nothing only a few years ago. Photographer: Bloomberg/Bloomberg

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