The U.S. oil-rig count fell by 13 to 646 in the latest week, according to Baker Hughes Inc., marking the 25th straight week of declines. The drop marks an acceleration from last week when U.S. oil-rig count fell by one, which sparked speculation that the count was bottoming out. The number of U.S. oil drilling rigs–a proxy for activity in the oil industry–has fallen sharply since prices headed south last year. There are now about 60% fewer rigs working since a peak of 1,609 in October. Crude-oil futures gained 4.8% to $60.42 after the data release. Prices have shot up by around 40% in the past two months on expectations that U.S. oil production will slow. But the rally has sputtered recently, as U.S. prices have been unable to hold above $60 a barrel. Earlier this week, the latest U.S. inventory data had mixed news for the oil market. […]