By Jessica Resnick-Ault
NEW YORK (Reuters) - Crude prices fell in a see-saw session on Friday, retreating after early gains as it looked likely that U.S. allies would push to maintain a deal with Iran, which could keep that country's crude exports on global markets.
In another sign global supplies could rise further, data in the afternoon showed U.S. crude producers added 10 rigs in the latest week.
Crude prices remained just below multi-year highs, with Brent on track for a weekly 2.8 percent gain and U.S. crude a 1.2 percent weekly rise.
U.S. light crude
The United States plans to reintroduce sanctions against Iran, which pumps about 4 percent of the world's oil, after President Donald Trump this week abandoned a 2015 deal that limited Tehran's nuclear ambitions. Many analysts expect oil prices to rise as Iran's exports fall.
Still, British Prime Minister Theresa May on Friday reiterated her support for the Iran nuclear deal and agreed with Trump that talks were needed to established how U.S. sanctions would affect companies operating in Iran.
U.S. investment bank Jefferies said in a note it expects Iranian crude oil exports to start falling in the next few months. However, there were signs that other members of the Organization of the Petroleum Exporting Countries (OPEC) will raise output to counter the Iran disruption.
Jefferies said OPEC has the capacity "to replace the Iranian losses" but added: "Even if physical supply is held constant ... the market will still be faced with a precariously low level of spare capacity."
Outside OPEC, U.S. crude production
More than half the total oil rigs are in Permian basin in west Texas and eastern New Mexico, the nation's biggest shale oil field. Active units there increased by five this week to 463, the most since January 2015.
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