CNBC | US crude settles at $51.08, down nearly 2.7% on prospect of rising US shale production CNBC "The petroleum markets have turned lower again in Wednesday trade amid talk that higher oil prices will translate into additional U.S. shale-oil production as a counter-balance to OPEC efforts to trim supply and reduce excess inventories," Tim Evans ... Oil trims loss as OPEC's Barkindo says he sees 'tremendous effort' to cut output Opec needs output cuts to balance oil market Oil Prices Fall In Spite Of Bullish OPEC Data |