- A North Sea pipeline outage continued to underpin oil prices, though operator Ineos says a crack in the line has not spread.
- Nigerian oil workers went on strike, raising concerns about supply from Africa's biggest crude producer.
- The number of oil rigs operating in the United States fell for first week in six, but U.S. production is still approaching 10 million barrels per day.
An oil pump jack in Gonzales, Texas.Getty Images
Oil prices edged lower on Monday, as growth in U.S. crude output cast a shadow over the market offset support from a North Sea pipeline outage and a workers' strike in the Nigerian energy industry.
U.S. West Texas Intermediate (WTI) crude futures ended Monday's session down 14 cents at $57.16 a barrel.
Brent crude futures, the international benchmark for oil prices, were at $63.15 a barrel, down 8 cents from their last close at 1:53 p.m. ET (1853 GMT).
The Brent benchmark had traded as high as $63.91 earlier in the day, but the contract pared gains after Ineos, the operator of the closed North Sea Forties pipeline, said crack in the line that shut it down had not spread.
