As most of the battered oil industry looks ahead to 2017 for a solid recovery, signs are emerging that the downturn pain could last even longer for owners of the floating rigs that drill in water more than two miles deep. The world’s largest offshore rig contractors are expected to see sales tumble 25 percent this year and another 10 percent in 2017 — though a glut of parked drilling vessels could push revenue down even further next year, Andrew Cosgrove and William Foiles, analysts at Bloomberg Intelligence, wrote Thursday in a report. Also on Thursday, Fitch downgraded the credit rating of Transocean Ltd., the world’s largest offshore rig owner, and revised its outlook to negative from stable. “Expectations that offshore drillers’ sales declines will ease over the next two years may need a reality check,” the analysts wrote. “The slide may worsen as an oversupply of rigs intensifies, […]