Oil prices slipped further on Friday as swelling inventories depressed sentiment despite widespread expectations that OPEC and Russia would agree some form of production cut next week.  Both international oil benchmarks, North Sea Brent LCOc1 and U.S. light crude CLc1, have had their weakest month for more than 10 years in November, losing more than 20 percent as global supply has outstripped demand. Brent was down 55 cents at $58.96 a barrel by 1015 GMT, while U.S. crude was down 75 cents at $50.70. Both contracts have made small gains this week, their first weekly rise in almost two months. Surging oil production in the United States, Russia and by members of the Middle […]