Wall Street Journal | Oil Prices Fall on Strong Shale Supply Wall Street Journal LONDON—Oil prices slid on Friday on concerns over the resilient U.S. crude production and a deal between Iran and the West that could unlock millions of barrels of crude on to the oversupplied world market. The number of U.S. oil-drilling rigs rose by ... UPDATE 9-Oil slides in thin trade on rising US rig count Oil Caps Biggest Weekly Drop Since March as Rigs Advance Oil prices fall on strong US shale supply |