U.S. West Texas Intermediate (WTI) crude was at $51.01 per barrel at 0647 GMT, up 41 cents, or 0.8 percent, from its last settlement. Brent was at $56.58, up 33 cents, or 0.6 percent.

EIA forecasts Brent spot prices to average $52/b in 2017 and $54/b in 2018, which is $1/b higher in 2017 and $2/b higher in 2018 compared with last month's forecast. West Texas Intermediate (WTI) average crude oil prices are forecast to be $3.50/b lower than Brent prices in 2018.

Falling global crude oil stockpiles in 2017 will help put the market “roughly” into balance in 2018, but an increase in prices could be limited, especially if the Organization of Petroleum Exporting Countries doesn’t stick to its agreement to curb output, the International Energy Agency said.

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.

Based on a “lower-for-longer” base-case scenario, global oil prices will remain in the $50-60/bbl range until late 2020, due to increasing supply that breaks even at $50/bbl, according to to the most recent global oil supply and demand outlook from McKinsey Energy Insights (MEI).

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.

As the world's two largest oil producers, Saudi Arabia and Russia have led the 24-country OPEC/non-OPEC coalition in its 1.8 million b/d supply cut, which is scheduled to end in March.

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.

Saudi Aramco will participate in the historic Royal Visit to Russia by The Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al-Saud from October 4 to 7, 2017.

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.

A snap poll conducted by price reporting agency S&P Global Platts showed that two-thirds of conference attendees thought crude would hold in a narrow range of between $50 and $60 a barrel in the coming year, exactly where it was today.

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.

“Fifty-dollar WTI is not high enough to support a material uptick in oilsands investments,” said Randy Ollenberger, managing director of oil and gas equity research for BMO Capital Markets. “Sustained US$60-plus oil prices are required to support most projects.”

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.