 A reopening of some major economies locked down due to the coronavirus has lifted global oil prices and encouraged U.S. shale producers to return at least a third of the 2 million barrels per day bpd curtailed since April. With most new drilling halted and OPEC relaxing curbs that have underpinned the oil-price recovery, shale output will slide again in autumn, said oil executives and analysts. Shale output falls off faster than at conventional oil wells, a factor that will lead to output declining by September. 