Oil prices fell on Wed after industry data showed a surprise build in crude oil inventory in the United States and as investors waited for news on whether a fresh round of U.S. tariffs on Chinese goods would take effect on Sunday.U.S. crude stocks clocked a surprise rise in the most recent week while gasoline and distillate inventories also rose, data from industry group the American Petroleum Institute shows.Crude inventories rose by 1.4 million barrels in the week to Dec. 6 to 447 million, while analysts were expecting a fall of 2.8 million barrels.