Brent crude futures, the international benchmark for oil prices, were trading at $56.75 per barrel at 0649 GMT, up 14 cents, or 0.25 percent, from their last close. Brent also rose 2 percent the previous day. U.S. West Texas Intermediate (WTI) crude futures were at $51.09 a barrel, up 17 cents, or 0.33 percent, from their last settlement. Prices rose 2 percent the day before to back above $50 a barrel.

Global benchmark Brent crude LCOc1 was down 2 cents at $55.60 a barrel at 11:31 a.m. EDT (1531 GMT). Earlier in the session it touched a three-week low of $55.06. It ended last week 3.3 percent lower, its biggest weekly loss since June 2017. U.S. West Texas Intermediate crude futures CLc1 were trading at $49.46, up 17 cents. They came close to a four-week low when they fell to $49.13 earlier in the session. WTI’s losses last week came to 4.6 percent.

Global benchmark Brent crude futures were up 7 cents at $57.07 a barrel at 0848 GMT. Week on week, the contract was set for a near 1 percent loss, snapping a five-week winning streak that was the longest since June 2016. U.S. West Texas Intermediate (WTI) crude was at $50.59, down 20 cents. It was set to close the week down more than 2 percent, the biggest weekly loss in three months.

U.S. West Texas Intermediate (WTI) crude futures CLc1 were at $50.16 per barrel at 0648 GMT, down 26 cents, or 0.5 percent, from their last close. They fell below $50 per barrel earlier in the session. Brent crude futures LCOc1 were down 22 cents, or 0.4 percent, at $55.78 a barrel.

Brent crude, the global benchmark, was down 12 cents at $56.67 a barrel at 0846 GMT. It notched up a third-quarter gain of around 20 percent, the biggest third-quarter increase since 2004 and traded as high as $59.49 last week. U.S. crude was down 17 cents at $51.50. The U.S. benchmark posted its strongest quarterly gain since the second quarter of 2016.

U.S. crude CLc1 was down 8 cents at $51.48 a barrel at 0641 GMT, after earlier rising slightly. Still, the contract is heading for a fourth consecutively weekly gain and is on track for a 9 percent advance this month. Brent LCOc1 rose 1 cent to $57.42 a barrel, heading for a fifth weekly climb and a nearly 10 percent gain for September.

Brent November crude futures were down 14 cents at $58.30 a barrel at 0832 GMT, while U.S. crude for November delivery edged up 11 cents to $51.99.

The Organization of the Petroleum Exporting Countries, Russia and several other producers have cut production by about 1.8 million barrels per day (bpd) since the start of 2017, helping lift oil prices by about 15 percent in the past three months.

International benchmark Brent crude futures were at $56.51 a barrel at 0644 GMT, up 8 cents, or 0.14 percent, from their last close. U.S. West Texas Intermediate (WTI) crude futures were up 12 cents, or 0.24 percent, at $50.67 per barrel.

The October light, sweet crude contract on the New York Mercantile Exchange gained 2¢ to settle at $49.91/bbl on Sept. 18. The November contract dropped 9¢ to settle at $50.35/bbl. The NYMEX natural gas price for October rose 12¢ to $3.14/MMbtu. The Henry Hub cash gas price climbed by 11¢ to $3.10/MMbtu. Heating oil for October fell nearly 2¢ to a rounded $1.78/gal. The NYMEX reformulated gasoline blendstock for October was up less than 1¢ to $1.67/gal on Sept. 18. The Brent crude contract for November on London’s ICE fell 14¢ to $55.48/bbl. The December contract declined 17¢ to $55.25/bbl. The gas oil contract for October was $525/tonne, down $9.75. OPEC’s basket of crudes for Sept. 18 was $53.78/bbl, up 14¢.