On the New York Mercantile Exchange, light, sweet crude futures traded at $43.65 a barrel at 0301 GMT, down 26 cents in the Globex electronic session. Brent crude on London's ICE Futures exchange fell 25 cents to $46.34 a barrel.

On the New York Mercantile Exchange, light, sweet crude futures for delivery in October traded at $43.72 a barrel at 0145 GMT, up $0.14 in the Globex electronic session. November Brent crude on London's ICE Futures exchange rose $0.27 to $46.12 a barrel.

Global oil demand growth is slowing at a faster pace than initially predicted.

Brent crude prices LCOc1 fell 92 cents to $47.40 a barrel by 0910 GMT (05:10 a.m. EDT), while U.S. West Texas Intermediate futures CLc1 declined by $1.03 to $45.26 a barrel.

London Brent crude for November delivery was down 58 cents at $49.41 a barrel as of 0647 GMT after rising above $50 for the first time in two weeks and settling up $2.01, or 4.2 percent, on Thursday. NYMEX crude for October delivery was down 51 cents at $47.11.

London Brent crude for November delivery had climbed 75 cents to $48.73 a barrel by 0400 GMT, after settling up 72 cents on Wednesday. NYMEX crude for October delivery was up 79 cents at $46.29, having ended the previous session up 67 cents.

Brent crude oil prices are forecast to average $43/b in 2016 and $52/b in 2017. West Texas Intermediate (WTI) crude oil prices are forecast to average $1/b less than Brent in 2016 and 2017.

November Brent crude futures rose 49 cents to $47.75 a barrel by 0900 GMT, while U.S. crude futures added 46 cents at $45.29 a barrel.

"Our government supported the freeze and we have to support the freeze. We have the capacity to produce more. But if the freeze is for a certain period and will stabilize the market, definitely the freeze is in our favor,"

"Supply and demand are near balance, but the balance is precarious," Andy Milnes, CEO, Integrated Supply & Trading (Eastern Hemisphere), BP, told delegates.