U.S. West Texas Intermediate (WTI) crude futures CLc1 were up 18 cents, or 0.4 percent, at $47.88 a barrel. Brent was heading for a weekly fall of about 2.1 percent, while WTI was off about 1.9 percent.
Traders said the increase came as Saudi Arabia said its crude exports to the United States would fall by around 300,000 barrels per day (bpd) between February and March.
In the United States, overseas oil suppliers like Saudi Arabia have to compete against rising shale drilling, which has pushed up U.S. oil production C-OUT-T-EIA by more than 8 percent since mid-2016 to just above 9.1 million bpd.
To other major consumer regions, however, Saudi exports remain high despite an effort led by the Organization of the Petroleum Exporting Countries (OPEC), and supported by other producers including Russia, to cut output by 1.8 million bpd during the first half of the year.
Data in Thomson Reuters Eikon shows that OPEC shipments to Asia, the world's biggest and fastest growing oil consuming region, were at 17.6 million bpd in March, up more than 5 percent since January, when the cuts officially started, in a sign that OPEC is shielding its main customers from the supply reductions.
Unless OPEC extends the curbs beyond June or makes bigger cuts, traders say oil prices are at risk of falling further.
"OPEC's goal of drawing down inventories to normal levels is not going to be reached before their agreement expires on June 30," said U.S. investment bank Jefferies in a note to clients.
Dennis Gartman, founder and editor of the Gartman Letter said the longer term outlook was for ongoing low oil prices.
"This slump is very real ... Fracking has only just begun here in the U.S. and it will be transferred swiftly to other countries abroad, so the supply of crude oil is going to increase rather dramatically in the years to come," he told the Reuters Global Markets Forum on Friday.
Despite the OPEC-led cuts that began in January, Brent has fallen by over 13 percent from its 2017 highs in early January as other producers have stepped up and filled the gap.
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