[LONDON] Brent extended losses to fall below US$56 a barrel on Wednesday, reversing a four session rally after US crude inventories jumped to a record high, shifting the global glut back in to focus.
Oil's near 20 per cent surge since Friday had raised speculation crude's seven-month rout may be at an end, but the sharp sell-off on Wednesday indicated prices may not yet have found a floor, with the market still well supplied.
The US Energy Information Administration said US crude stocks rose by 6.3 million barrels last week to 413.06 million barrels, the highest level since records began in 1982.
Crude stocks at Cushing, Oklahoma, delivery point of the US crude oil contract rose by 2.5 million barrels, while gasoline and distillate stocks also jumped.
Brent was US$2.10 lower at US$55.81 a barrel by 1600 GMT, having traded as high as $59 a barrel on Tuesday - well above lows for the year close to US$45 a barrel hit two weeks ago.
US crude futures were down US$2.81 at US$50.24 a barrel.
"Just looking at the overall picture, there is no shortage of oil anywhere," said Sal Umek at the Energy Management Institute in New York.
"It is bearish straight across the board."
Since prices fell by 60 per cent between June and January, traders have wrestled with whether the dramatic price collapse would be enough to slow fast-growing US shale output or whether oil still had further to fall.
While a sharp drop in the number of US oil rigs and a wave of budget cuts by major energy companies boosted speculation production would fall faster than expected, analysts predict the market will still be oversupplied for the first half of the year.
Too quick a price recovery may also keep expensive shale projects running, traders said.
"Prices are looking for a level to stabilise around for a few weeks or months," said Richard Mallinson, an analyst at Energy Aspects in London.
"It's looking like it could be in the fifties."
Other factors are also influencing the outlook, with the dollar steadying after its worst day in more than a year. The US unit rose against a basket of currencies by 0.2 per cent, making dollar-traded commodities more expensive.
The outlook for oil demand has also been muddied by signs the Chinese economy is slowing. On Wednesday data showed China's services sector grew at the slowest pace in six months in January.