Oil rose one per cent on Friday, boosted by lower U.S. stockpiles, a slight slowdown in U.S. crude production and signs of increased Chinese demand, but trading was volatile as global supply remained strong.

Brent crude futures, the international benchmark for oil, settled up 49 cents US, or 1.01 per cent, at US$48.91 per barrel.

U.S. West Texas Intermediate (WTI) crude futures settled up 46 cents US, or one per cent, at US$46.54 per barrel.

Crude oil contracts were on track for weekly gains of more than 5.2 per cent for U.S. WTI and more than 4.7 per cent for Benchmark Brent.

"I think the big driver is inventory numbers," said Stewart Glickman, head of energy research at CFRA Research in New York, "We've finally broken below 500 million barrels, I feel like it's a psychological barrier."

U.S. crude inventories fell 7.6 million barrels last week, its biggest weekly plunge in 10 months, the U.S. Energy Information Administration (EIA) said on Wednesday.

And while U.S. energy firms added oil rigs for a second week in a row according to Friday data from Baker Hughes, the pace of additions has slowed to its lowest this year.

Oil production in North Dakota fell 10,000 barrels-per-day in May.

Still, oil stocks remained comfortably above the five-year average, and prices were more than 15 per cent below their 2017 highs.

Moreover, output cuts from producing countries coordinated by the Organization of the Petroleum Exporting Countries have been stymied by rising output from Libya and Nigeria, which are exempt. June compliance among other members also fell to just 78 per cent, according to the International Energy Agency (IEA).

Kuwait's OPEC governor told Reuters in an interview that it would be premature to cap Nigerian and Libyan oil production.

Brent and WTI prices were roughly five per cent above the week's lows, aided by reports of accelerating demand growth from the IEA, crude oil import growth in China and falling crude stocks in the United States.

China's crude oil imports over the first six months of 2017 were 13.8 per cent above the year-ago period, customs data showed. Asian traders are selling oil products out of tanks to meet soaring demand, while the EIA reported the largest drop in U.S. crude oil inventories in the week to last week in 10 months.

Analysts at Commerzbank said a reduction in the developed world's oil stocks was likely to continue as long as OPEC did not further significantly increase its output.