Oil prices recovered on Thursday from losses chalked up the session before, but the market remained under pressure as bloated U.S. crude inventories and rising output dampen OPEC-led efforts to curb global production, Reuters reported.
Brent crude futures, the international benchmark for oil, were at $50.95 per barrel at 0231 GMT, up 31 cents, or 0.6 percent, from their last close. That came after Brent briefly dipped below $50 a barrel on Wednesday for the first time since November.
U.S. West Texas Intermediate (WTI) crude futures were up 35 cents, or 0.7 percent, at $48.39 a barrel, after testing support at $47 overnight.
Analysts said Brent had found technical support around $50 a barrel and was being pushed up as traders took new long positions after crude hit multi-month lows overnight.
Despite the bounce, traders said the market remained under pressure, largely due to a big U.S. inventory and doubts that an effort led by the Organization of the Petroleum Exporting Countries (OPEC) to cut output was reining in a global fuel supply overhang.
Greg McKenna, chief market strategist at futures brokerage AxiTrader, said OPEC was "underwriting the investment plans and returns of their competition in U.S. shale oil."
McKenna said there was a risk of oil prices dropping further due to U.S. output and a lack of compliance by some producers who said they would cut production.
The Energy Information Administration (EIA) said U.S. inventories climbed almost 5 million barrels to a record 533.1 million last week, far outpacing forecasts of a 2.8 million-barrel build.
The high inventories come as U.S. oil production has risen over 8 percent since mid-2016 to more than 9.13 million barrels per day (bpd) to levels comparable in late 2014, when the oil market slump started.
There were also signs of a bloated market in Asia, where China's gasoline imports slumped while its refiners sent huge volumes overseas as they refine more fuel than the domestic market can absorb.
China's gasoline exports in February hit the second highest on record, up 76.6 percent over a year earlier at 1.06 million tonnes, data from the Chinese customs showed on Thursday. Diesel exports last month surged 66.7 percent on year at 1.32 million tonnes.
China imported just 7,245 tonnes of gasoline in February, tumbling 94 percent from the same period last year. Diesel imports dropped 52 percent from a year ago to 50,000 tonnes.