Analysis: Europe can't look to U.S. shale to fill any OPEC gap
U.S. shale oil drillers turned from scrappy wildcatters into multi-millionaires over the past two decades, propelling the United States to become the world's largest producer, but now they are running out of runway.
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### Instruction: Analysis: Europe can't look to U.S. shale to fill any OPEC gap

### Response: U.S. shale oil drillers turned from scrappy wildcatters into multi-millionaires over the past two decades, propelling the United States to become the world's largest producer, but now they are running out of runway.