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“The message from oil services firms is that shale drillers will not simply be able to turn the tap back on again once prices rise. Halliburton said on its earnings call last month that pressure pumping equipment currently sitting idle was being cannibalized for parts while the stuff still being used was being worked to its limits. And the falling backlog of uncompleted wells will also begin to make an impact.”

Liam Denning, Bloomberg View columnist