Oil prices rose on Friday, following an agreement by OPEC and other major producers to extend output curbs until the end of 2018 to try to reduce the global oilglut.
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The Organization of the Petroleum Exporting Countries and some non-OPEC producers led by Russia agreed on Thursday to keep current limits on output in place until the end of next year, although they signaled a possible early exit from the deal should the market overheat and prices rise too far.
Brent was trading at $63.22 by 1202 GMT, up 59 cents on the day. U.S. light crude was up 46 cents at $57.86.
"OPEC and the cooperating countries have created a very high level of confidence that they are standing behind the oil market, that they're going to drive the inventories further down," SEB Markets chief commodities analyst Bjarne Schieldrop said.
"They gave a very serious and trustworthy appearance yesterday and that is taking away a lot of the downside in the market," he said.
The deal, which has been in place since January and was due to expire in March, has seen producers reduce output by 1.8 million barrels per day (bpd), helping to halve global oiloversupply over the past year.
It has allowed prices to return above $60 per barrel, recovering from lows of $27 per barrel hit in January 2016.
But the price rise has also revived the specter of the bull market of the last decade when Brent prices soared.
These concerns led Russia to stress the need for clarity on an exit strategy from the deal and to this end, a reference to a review process in June was included.
"Without the reference to a June review, Russia would have been tied to the end of 2018; it wanted instead to have an escape clause," Petromatrix strategist Olivier Jakob said.
"It leaves a question mark about the second half [of 2018] and about the commitment of Russianoil companies, which will be price dependent," he said.
The CEO of Russia's top private producer Lukoil told Reuters he would like to see the price of oilstable at current levels, trading in the $60-65 per barrel range.
The oil market is unlikely to overheat, he added, thanks to cooperation between OPEC and its allies which would allow them to release new output into the market to rebalance it.
Price rises could also fuel more drilling in the United States, which is not party to the agreement, Russia warned.
Rising U.S. production has been a thorn in OPEC's side, undermining the impact of its output curbs.
U.S. oil production
(Additional reporting by Aaron Sheldrick; Editing by David Evans and Mark Potter)