Oil prices edged up on Friday as turmoil in Venezuela increased the chances of tighter global supply if the United States makes good on signals that it could impose sanctions on Venezuelan exports.  But fresh data on surging U.S. fuel stocks and worries about U.S.-China trade talks weighed on prices. Brent crude oil futures were at $61.17 a barrel at 0955 GMT, up 8 cents, or 0.13 percent. Earlier on Friday, the international benchmark crude rose as high as $61.92. Brent, however, has shed about 2.4 percent since the start of trade on Monday and is on track to post its first week of losses in four weeks. U.S. West Texas […]