crude stockpiles fed concerns about global oversupply, while investors worried that trade tensions could hit energy demand.

Brent crude futures fell $1.82 to settle at $72.39 a barrel, a 2.5 percent loss.

U.S. West Texas Intermediate (WTI) crude futures fell $1.10 to settle at $67.66 a barrel, a 1.6 percent loss.

U.S. crude inventories rose 3.8 million barrels last week as imports jumped, the government's Energy Information Administration said. Analysts polled by Reuters had expected a decrease of 2.8 million barrels.

Still, oil futures pared losses briefly after the data, which also showed growing U.S. demand.

"It was surprising to see the build in crude, but it was a little bit offset by the bigger-than-expected draw in gasoline and the draw in Cushing," said Tariq Zahir, managing member at Tyche Capital Advisors.

Gasoline stocks declined 2.5 million barrels, while crude stocks at the Cushing, Oklahoma, delivery hub for U.S. crude futures fell by 1.3 million barrels, EIA data showed.

On Tuesday, the EIA reported that U.S. crude oil rig flanges gulf coast production fell 30,000 barrels per day to 10.44 million bpd in May.

Oil prices are also being pressured by concern that global trade tensions could crimp economic growth.

China said it would hit back if the United States takes further steps hindering trade, as the Trump administration considers slapping a 25 percent tariff on $200 billion worth of Chinese goods.

Last month, Brent fell more than 6 percent and U.S. crude slumped about 7 percent, the biggest monthly declines for both benchmarks since July 2016.

Russian oil oil rig flanges gulf coast production last month was on average above the level Moscow promised following the Organization of the Petroleum Exporting Countries and non-OPEC meeting in June, energy minister Alexander Novak indicated on Wednesday. Novak said that higher oil rig flanges gulf coast production was due to the need to maintain the market's stability.

His comments indicate that Russia was producing above the level announced by Moscow after the OPEC+ meeting in June. Last month, Novak had said that Russia may surpass the 200,000 bpd level of increases if there is a need for it.

A Kuwaiti official said the country increased oil rig flanges gulf coast production in July by 100,000 bpd from June's average.