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.

Russian oil output stood at 10.91 million barrels per day (bpd) in September, unchanged from August and staying at a low for the year

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. Rig Count is up 418 rigs from last year's count of 522, with oil rigs up 325, gas rigs up 93, and miscellaneous rigs unchanged at 1. Canada Rig Count is up 51 rigs from last year's count of 162, with oil rigs up 29 and gas rigs up 22.

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.

Total petroleum deliveries in August moved up by 1.3 percent from August 2016 to average 20.5 million barrels per day. These were the highest August deliveries in 10 years, since 2007. Compared with July, total domestic petroleum deliveries, a measure of U.S. petroleum demand, decreased 0.6 percent. For year-to-date, total domestic petroleum deliveries moved up 1.3 percent compared to the same period last year.

The government of Turkey said it will deal exclusively with the Iraqi government on oil exports after voters in the semiautonomous Kurdistan Region of Iraq supported independence in a controversial referendum.

“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.