OPEC’s crude-oil output is up by 100,000 barrels a day in December from November, despite a 200,000 barrel-a-day drop in flow from Saudi Arabia, U.S. government estimates published Thursday show. Crude output from the Organization of the Petroleum Exporting Countries is averaging 29.4 million barrels a day, slightly more than the month-earlier level that was the lowest since May 2011, the Energy Information Administration said. EIA’s estimate shows labor disputes in Libya are keeping the North African nation’s December oil output at the November level of just 200,000 barrels a day. That is down from average output of 1.4 million barrels a day in the last two months of 2012, EIA data show. Output from Saudi Arabia is estimated at 9.5 million barrels a day, down 200,000 barrels a day from a month earlier, but 200,000 barrels a day more than the average in November […]