Oil rose on Wednesday, lifted by reports of Saudi supply cuts to Asia, but gains were capped by a lack of detail about the reductions and because of signs of rising supplies from other producers.
Prices for Brent futures, the international benchmark for oil prices, were trading at $53.85 per barrel at 0723 GMT, up 21 cents from their last close.
U.S. West Texas Intermediate (WTI) crude futures were at $51.07 a barrel, up 25 cents.
Traders said the gains were a result of mounting reports that Saudi Arabia, the world's top oil exporter, was cutting crude supplies slightly from contracted volumes in February, including to India and Malaysia.
But there are still plenty of signs that global supplies are ample. Seeking to plug any supply gap left by the OPEC production cuts, European and Chinese traders are shipping a record 22 million barrels of crude from the North Sea and Azerbaijan to Asia this month.
Many observers also still doubt the planned cuts will go deep enough to rebalance a market that has suffered from oversupply for the past two years. Both Brent and WTI futures were down around 6 percent this month.
"Traders continued to fret about rising U.S. supply and compliance by OPEC to agreed-upon production cuts," ANZ bank said.
The U.S. Energy Information Administration (EIA) said on Tuesday that American crude production in 2017 would rise by 110,000 barrels per day (bpd) to 9 million bpd.
Energy consultancy Wood Mackenzie also said oil and gas companies will increase spending by 3 percent to $450 billion in 2017 globally.
Another concern is high U.S. crude stockpiles, with the EIA scheduled to release its latest figures on Wednesday.
Outside the United States, there were lingering doubts over compliance with production cuts from members of the Organization of the Petroleum Exporting Countries (OPEC).
OPEC's second-biggest producer Iraq plans to raise crude exports from its southern port of Basra to an all-time high of 3.641 million bpd in February, keeping shipments high even as OPEC production cuts take effect this month.
Some cuts, however, were happening. In non-OPEC member Russia, which also agreed to cut output, extreme cold has helped reduce production by around 100,000 bpd this month as facilities struggled to cope with the extreme conditions.
However temperatures in Siberia, where a lot of Russian oil production is located, are expected to rise within the next week to more normal levels for this time of year, meteorological data in Thomson Reuters Eikon showed.