Oil prices were stable on Thursday, supported by rumblings from within OPEC that production curbs may become necessary again to prevent a return of global oversupply.
But soaring US crude output, which hit a record 11.6 million barrels per day (bpd) last week, kept a lid on prices.
US West Texas Intermediate (WTI) crude oil futures were at $61.75 per barrel at 0120 GMT, up 8 cents from their last settlement.
Front-month Brent crude oil futures were up 6 cents at $72.13 a barrel.
A group of producers around the Middle East-dominated Organization of the Petroleum Exporting Countries (OPEC) as well as Russia decided last June to relax output curbs in place since 2017, after pressure from US President Donald Trump to reduce oil prices and make up for supply losses from Iran.
But with Iran sanctions now in place and oil still in ample availability, OPEC-led production cuts next year cannot be ruled out, two OPEC sources said on Wednesday.
"OPEC and Russia may use cuts to support $70 per barrel," said Ole Hansen, head of commodity strategy at Saxo Bank.
"The introduction of US sanctions earlier this week against Iran failed to lift the market given the announcement that eight countries, including three of the world's biggest importers, would receive waivers to carry on buying Iranian crude for up to six months," Hansen said.
The Only Way Is Up
Preventing oil prices from rising any further has been a relentless rise in US crude output, which hit a record 11.6 million bpd in the week ending November 2, according to Energy Information Administration (EIA) data released on Wednesday.
That's a threefold increase from the U.S. low reached a decade ago, and a 22.2 percent rise just this year. It makes the United States the world's biggest producer of crude oil.
That has impacted US crude inventories, which rose by 5.8 million barrels in the week ending November 2, to 431.79 million barrels, the EIA said.
Crude stocks moved back above their five-year average levels in October.
Production has not just risen in the United States, but also in many other countries, including Russia, Saudi Arabia, Iraq and Brazil, stoking producer concerns of a return of oversupply that depressed oil prices between 2014 and 2017.
"Producers are concerned about the potential oversupply ... after EIA reported that crude inventories rose by 5.8 million barrels," said Stephen Innes, head of trading for Asia-Pacific at futures brokerage Oanda in Singapore.