By Libby George and Christopher Johnson
LONDON (Reuters) - Oil prices recovered from a one-week low on Thursday as the International Energy Agency said oil markets were tightening even before cuts agreed by OPEC and other producers took effect.
Oil prices have gyrated this year as the market's focus has swung from hopes that oversupply may be curbed by output cuts announced by the Organization of the Petroleum Exporting Countries and other producers to fears that a rebound in U.S. shale production could swamp any such reductions.
Benchmark Brent crude was up 55 cents at $54.47 a barrel by 1430 GMT after closing down 2.8 percent in the previous session. U.S. crude was up 5 cents at $51.63 a barrel, having dropped to a one-week low on Wednesday of $50.91.
The IEA said that while it was "far too soon" to gauge OPEC members' levels of compliance with promised cuts, commercial oil inventories in the developed world fell for a fourth consecutive month in November, with another decline projected for December.
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It raised sharply its 2016 demand growth estimate, and said the data indicated that rising demand was slowly tightening global oil markets.
Still, analysts said it was crucial that OPEC and other producers cut output as promised, particularly as a resilient U.S. shale industry threatened to add more barrels to the market.
"Discipline and strict adherence to the new quotas will be needed probably throughout 2017 and beyond to see the long-awaited and sustainable rebalancing finally arrive," PVM Oil Associates analyst Tamas Varga said.
OPEC has said its cuts will help balance the market and that its output had already fallen in December. But it also pointed to the possibility of a rebound in U.S. output amid higher oil prices.
The head of the IEA, Fatih Birol, said in Davos, Switzerland, on Thursday that he expected U.S. shale oil output to rebound by as much as 500,000 bpd over the course of 2017, which would be a new record.
U.S. data sent more mixed signals. American Petroleum Institute (API) data on Wednesday showed U.S. crude stocks fell by 5.04 million barrels in the week to Jan. 13, well above the expectations of a 342,000-barrel decline.
But the data also showed larger-than-expected, and potentially bearish, increases in stocks of gasoline and distillates.
Weekly inventory data is due from the U.S. Energy Information Administration (EIA) at 1600 GMT.
(Additional reporting by Naveen Thukral in Singapore; Editing by Jason Neely and Mark Potter)
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