Current forecasts of U.S. crude oil production growth may have to be significantly revised as the recent slide in active drilling rigs in the top shale basin, the Permian, suggests that output may disappoint due to supply chain constraints and cost inflation in the double digits. The rig count in the Permian Basin dropped by 2 to 340 last week, as the number of total active drilling rigs in the United States dropped by 1, according to new data from Baker Hughes published on Friday. The active oil rigs in the Permian now number 316 - the lowest…