The U.S. Energy Information Administration (EIA) released its crude oil inventories data on Wednesday. U.S. crude inventories increased by 2.62 million barrels to 456.2 million in the week to August 14.
Analysts had expected U.S. crude oil inventories to decline by 0.6 million barrels.
Gasoline inventories fell by 2.7 million barrels, according to the EIA.
Crude stocks at the Cushing, Oklahoma, rose by 326,000 barrels.
U.S. crude oil imports increased by 465,000 barrels per day.
Refineries in the U.S. were running at 95.1% of capacity, down from 96.1% the previous week.