Oil prices closed at their lowest level in nearly three months on Wednesday as data showed an unexpected build in U.S. crude oil and product stocks.
U.S. oil prices closed down 68 cents, or 1.30 percent, at $51.56 a barrel. That was its lowest settlement since April 10.
Brent futures quickly reversed gains made earlier in the day on expectations of a decline in U.S. inventories and the failure so far of Iranian nuclear talks to produce a deal.
While most expected the U.S. Energy Information Administration's (EIA) weekly report to show a decline in crude oil and gasoline stocks, both rose, along with distillates.
Brent crude was flat to higher around $57.40 a barrel.
"It's negative all around," Gareth Lewis-Davis, commodities strategist with BNP Paribas, said of the EIA report. "It's part of the downward trend that's been going on for two weeks, and it's likely to last for the rest of the day."