Shale-oil companies are using almost all of the fracking equipment and crews available as exploration expands, accelerating cost inflation and pointing to worsening supply-chain disruptions across the industry.North American oil drillers appear likely to expand spending by more than 25% this year while overseas explorers are on course for a more modest increase in the mid teens, Halliburton Co. executives said on Monday after reporting their biggest quarterly profit in seven years.The world’s top provider of fracking services already is seeing tightening labor, trucking and raw-material supplies, and in some regions as much as 80% of workers are transplants recruited from other areas. Even something as mundane as the sand Halliburton blasts into wells to help fracture oil-soaked rocks is getting harder to source, Chief Executive Officer Jeff Miller said during a conference call with analysts.
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