Oil traded near $50 after a drop in active rigs in the U.S. and further supply disruption in Nigeria. Futures rose as much as 0.8 percent in New York. Rigs targeting crude in the U.S. fell by 2 to 316, after no change the previous week, Baker Hughes Inc. said on its website Friday. Explorers have dropped more than 1,000 oil rigs since the start of last year. A Nigerian militant group said it blew up three pipelines in the oil-rich Niger River delta on Saturday, the third attack in as many days, as it steps up an offensive to cripple the West African nation’s oil and gas industry. Oil has rebounded since tumbling to a 12-year low in February amid output declines in the U.S., Nigeria and Canada. Prices climbed above $50 a barrel on Thursday as declining U.S. crude supplies eroded a global glut. West Texas Intermediate […]