Two Chevron Corp. natural-gas wells in southwestern Pennsylvania are no longer on fire after an explosion last week that left one worker missing, according to the company. Chevron said the flames had gone out Saturday afternoon at the well site in Dunkard Township, about 70 miles south of Pittsburgh. Workers were preparing to remove a charred crane above one well and stop the gas from flowing. A company spokesman said there is no word of the missing worker, a contractor. “It is premature to speculate on what caused the flames to go out,” the company said, adding that the crane is now cool enough that it won’t cause gas flowing from the wells to ignite. The blast took place early on the morning of Feb. 11, as Chevron and its contractors were running tubes through the well to start producing natural gas. The fire heated the crane to such […]