US oil plunges 5.7% on China, closes at $29.42 a barrel

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World oil prices slumped to below $29 a barrel on Friday, as a further fall in the Chinese stock market and the prospect of an imminent rise in Iran's crude exports deepened fears of a longer supply glut.

After closing higher for the first time in eight sessions on Thursday, U.S. and Brent crude futures slumped to new 12-year lows, taking this year's losses to more than 20 percent, the worst two-week decline since the 2008 financial crisis.

The slump was not over yet, some analysts warned, as the lifting of sanctions on Iran opens the door to a wave of new oil. The International Atomic Energy Agency (IAEA) is expected later on Friday in Vienna to issue its report on Iran's compliance with an agreement to curb its nuclear program, potentially triggering the lifting of Western sanctions.

Shares in China, the world's No. 2 oil consumer, tumbled on Friday, with the Shanghai index ending down 3.5 percent to its lowest close since December 2014 and the yuan weakening sharply offshore. Adding to fuel demand concerns, U.S. data showed retail sales fell and industrial production weakened in December.

The "ongoing worries regarding the pace of economic growth" spurred a new round of selling in the oil market, said Tim Evans, energy futures specialist at Citi Futures.

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The was down $1.77, or 6.25 percent, at $28.96 a barrel, having fallen as low as $28.82, the weakest level since February, 2004.

U.S. crude futures closed down $1.78, or 5.71 percent, at $29.42 a barrel.

Prices remained steady after oilfield services firm Baker Hughes reported the U.S. oil rig count fell by just 1 rig, bringing the total to 515. At this time last year, drillers were operating 1,366 rigs in U.S. oil fields.

Even before Iran's sanctions are lifted, Iran's oil exports were on target to hit a nine-month high in January. Tehran is expected to target India, Asia's fastest-growing major oil market, as well as its old partners in Europe with increased exports once sanctions are lifted.

"It is the wrong time for Iran to be returning to the oil market, both for the market and likely also for Iran," Phillip Futures said in a note on Friday.

Despite oil prices hovering around new multi-year lows, analysts say that prices have not hit the bottom just yet, with demand likely to ease in coming weeks, especially with refiners beginning to shut for routine spring maintenance.

A further fall in prices "cannot be excluded", Commerzbank analyst Carsten Fritsch told Reuters Global Oil Forum. He warned that $25 a barrel "is quite possible, but not much lower than that."

Commerzbank cut its 2016 forecast for oil prices, changing its year-end expectation for Brent to $50 per barrel, down from a previous forecast of $63.

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The oil price collapse has hammered currencies from commodity-producing nations and spooked financial markets as investors worry about the health of the global economy.

Still, influential U.S. bank Goldman Sachs on Friday maintained its $40 price forecast for U.S. crude for the first half of 2016.

"The key theme for 2016 will be real fundamental adjustments that can rebalance markets to create the birth of a new bull market, which we still see happening in late 2016," Goldman said in a report.