OPEC took no action to ease a global oil-supply glut, resisting calls fromVenezuela that the group needs to stem the rout in prices. Futures slumped the most in more than three years. The group maintained its collective production ceiling of 30 million barrels a day, Ali Al-Naimi, Saudi Arabia’s oil minister, said yesterday after the 12 nations met in Vienna. Brent crudedropped as much as 8.4 percent in London, extending this year’s decline to 34 percent. Oil tumbled into a bear market this year as the U.S. pumped the most in more than three decades and conflict in the Middle East and Ukraine failed to disrupt supply. While OPEC’s 30-million-barrel limit has been in place since 2012, the group actually produced almost 1 million barrels more last month, data compiled by Bloomberg show. “OPEC has chosen to abdicate its role as a swing producer, leaving it to the market to decide what the oil price should be,” Harry Tchilinguirian, head of commodity markets at BNP Paribas SA in London, said yesterday by phone. “It wouldn’t be surprising if Brent starts testing $70.” Brent, a global benchmark, is poised for the biggest annual decline since 2008 on the ICE Futures Europe exchange in London. Futures fell the most since May 2011 and traded down $5.17 to $72.58 a barrel yesterday. bloomberg.