A split reality is emerging for U.S. shale drillers: Those that primarily pump oil are still struggling to survive, while those that produce natural gas are slowly seeing signs of recovery. Oil-focused fracking companies are under extreme financial strain, as renewed concerns about the coronavirus pandemic are weighing down crude prices. But gas-focused drillers are getting a long-awaited reprieve. Natural-gas prices are climbing ahead of winter, and are less sensitive to lockdowns that erode demand for transportation fuels. …