Oil prices eked out a gain Friday but settled lower for the week after the U.S. Federal Reserve chairwoman left the door open for a sooner-than-later rate increase . U.S. crude for October delivery settled up 31 cents, or 0.7%, to $47.64 a barrel on the New York Mercantile Exchange. Prices fell 3% this week. Brent, the global benchmark, rose 25 cents, or 0.5%, to $49.92 a barrel on ICE Futures Europe. Prices fell 1.9% on the week. Oil prices have wavered this week as investors weighed continued concerns that the global market remains oversupplied against new indications that the Organization of the Petroleum Exporting Countries could agree to a production freeze in September. U.S. commercial inventories of crude oil and refined products rose to a record high, a sign that the global glut […]