Brent crude futures LCOc1 were down 18 cents at $51.60 a barrel by 0725 ET. U.S. West Texas Intermediate (WTI) crude CLc1 was down 37 cents at $50.48.

U.S. West Texas Intermediate (WTI) crude CLc1 was trading at $50.59 a barrel at 0652 GMT, down 4 cents from its last settlement. Brent crude futures LCOc1 were up 7 cents at $51.45 per barrel.

U.S. West Texas Intermediate (WTI) crude oil futures were trading at $50.81 per barrel at 0011 GMT, up 52 cents, or 1 percent, from their last settlement. International Brent crude futures were at $52.14 a barrel, up 46 cents, or 0.9 percent.

Brent crude futures LCOc1 fell as far as 2 percent before clawing back to trade up 29 cents at $47.44 per barrel at 1008 GMT. U.S. West Texas Intermediate (WTI) crude futures CLc1 also recouped early losses and were trading up 15 cents at $46.21 per barrel.

U.S. West Texas Intermediate (WTI) crude oil futures were trading at $50.81 per barrel at 0011 GMT, up 52 cents, or 1 percent, from their last settlement. International Brent crude futures were at $52.14 a barrel, up 46 cents, or 0.9 percent.

U.S. West Texas Intermediate (WTI) crude had fallen 38 cents to $45.55 a barrel by 0103 GMT, after rising $1.45, or 3.3 percent, in the previous session. Brent crude futures slipped 43 cents to $46.91 a barrel after closing up $1.46, or 3.2 percent.

U.S. West Texas Intermediate (WTI) crude oil futures CLc1 were trading at $45.81 per barrel at 0301 GMT (11:01 p.m. EDT), up 47 cents, or 1 percent, from their previous close. The contract had already gained as much as 3 percent the day before. International benchmark Brent crude futures LCOc1 were also up, gaining 48 cents, or 1 percent, from their last close to $47.31 per barrel.

International benchmark Brent crude prices were up 68 cents at $54.84 a barrel at 0950 GMT. U.S. West Texas Intermediate (WTI) crude oil futures were trading up 63 cents at $52 a barrel.

REUTERS - Brent futures were down 44 cents or 0.7 percent, at $64.37 a barrel by around 0700 GMT. On Thursday, Brent fell 1.1 percent to its lowest close since Dec. 20. U.S. West Texas Intermediate (WTI) crude was down 62 cents, or 1 percent, at $60.53 a barrel, having settled down 1 percent in the previous session at its lowest close since Jan. 2.

U.S. West Texas Intermediate (WTI) crude futures were up 1.8 percent, or 81 cents, at $44.86 a barrel at 0403 GMT. The October contract expired yesterday at $43.44 a barrel and the front-month has now rolled over to November delivery. International Brent crude futures were at $46.47 per barrel, up 59 cents, or 1.3 percent, from their last close.

Brent crude LCOc1 was at $51.91 per barrel at 0655 GMT, up 39 cents, or 0.76 percent from the previous close. U.S. West Texas Intermediate (WTI) crude CLc1 was up 40 cents, or 0.8 percent, at $50.34 a barrel.

Brent crude oil futures LCOc1 were up 85 cents a barrel at $49.75 by 1000 GMT (5:00 a.m. ET), having earlier risen $1 in a push against the $50 mark for the first time since the end of October. U.S. West Texas Intermediate (WTI) crude futures CLc1 were up 68 cents, or 1.4 percent, at $48.92 a barrel.

OPEC will reduce output by about 1.2 million barrels a day by January, the group said, fulfilling a plan sketched out in Algiers in September to cut its production to 32.5 million barrels. The agreement exempted Nigeria and Libya, but gave Iraq its first quotas since the 1990s. West Texas Intermediate crude futures rose 0.3 percent to $49.61 a barrel at 11:44 a.m. Singapore time after gaining 9.3 percent Wednesday, the biggest one-day gain since Feb. 12.

Brent crude futures LCOc1 were trading at $46.29 per barrel at 0705 GMT, up 71 cents, or 1.56 percent, from their previous close. U.S. West Texas Intermediate (WTI) crude futures CLc1 were up 730 cents, or 1.66 percent, at $44.80 a barrel.

International Brent crude oil futures LCOc1 were trading at $54.83 per barrel at 1127 GMT, down 11 cents from Monday's close. U.S. West Texas Intermediate crude was at $51.50 a barrel, down 29 cents.

Front-month Brent crude futures LCOc1 were down 45 cents, or 0.8 percent by 0951 GMT (4:51 a.m. ET) from their last settlement at $53.49 per barrel. The contract was up more than 13 percent this week, its biggest gain since March 2009. U.S. West Texas Intermediate (WTI) futures CLc1 were at $50.68, down 38 cents.

Prices for Brent futures, the international benchmark for oil prices, were trading at $53.73 per barrel at 0508 GMT, up 9 cents from their last close. U.S. West Texas Intermediate (WTI) crude futures were at $50.97 a barrel, up 15 cents.

International Brent crude futures were down 58 cents at $55.14 per barrel at 1054 GMT. U.S. West Texas Intermediate (WTI) crude oil futures were down 61 cents at $52.37 a barrel.

Brent crude futures were down 39 cents, or 0.5 percent, at $71.79 at barrel. WTI crude futures for July delivery were down 59 cents, or 0.9 percent, at $62.54.

Brent crude futures were trading at $54.02 per barrel at 0808 GMT, flat from its last settlement. U.S. West Texas Intermediate (WTI) crude was down 2 cents at $50.88 per barrel.