* Oil up as much as 2.2 pct on Trans-Alaska pipeline leak
* Short term supply threat, longer term regulatory risks support
* Technicals point to weaker crude prices (Updates prices)
By Nick Trevethan
SINGAPORE, Jan 10 (Reuters) - Oil retreated from almost $90 a barrel on Monday, but still traded 1 percent higher after a leak shut an Alaskan pipeline that carries 12 percent of U.S. crude output.
The Trans Alaska Pipeline was shut down on Saturday after a leak at the start of the pipeline in Prudhoe Bay, forcing oil companies to cut output to 5 percent of their daily average of 630,000 barrels. [
]The shutdown of one of the key oil arteries in the United States sent crude prices leaping early in Asia to a high of $89.98 a barrel, as buyers worried about availability in the PADD 5 region -- the western United States.
"The refineries in PADD 5 might be able to obtain supplies from overseas. The longer term implication of such leaks would be mounting public scrutiny on the regulation and maintenance of oil production and distribution infrastructure," said Chen Xin Yi, associate vice president at Barclays Capital in Singapore.
By 0658 GMT, NYMEX crude for February <CLc1> rose 87 cents to $88.90 a barrel, recovering some of the losses from the previous two sessions. Prices easlier rallied almost $2 to $89.98 Brent crude <LCOc1> rose 56 cents $93.89.
"This adds to what happened in the Gulf of Mexico at a time when U.S. regulators are still looking at regulations around oil drilling," said Ben Westmore, commodities analyst at National Australia Bank.
"Events like this carry risks around future regulation that could dramatically reduce supply on a more permanent basis than this temporary outage. There is a possibility the risk is pretty substantial for the (oil futures) market."
For a list of incidents at the pipeline, click [
].Traders said that if the outage lasted longer than a week or two, it has the potential to be very bullish. One noted that most of the pipeline's previous problems had been fixed quickly, but in the post-Deepwater Horizon world, approvals to restart after accidents could take longer.
The shutdown of the 800-mile (1,280 kilometre) line, which runs from the Prudhoe Bay oilfield to the tanker port of Valdez, has not yet affected shipments, and tankers are being loaded on schedule at Valdez, meaning there is no immediate danger of restricted oil supply. Oil produced during the shutdown will be stored at Prudhoe Bay until the pipeline reopens.
Before the weekend, a fire halted production at Canadian Natural Resources main oil sands project in northern Alberta.
The firm could not say on Friday when its 110,000 barrel a day Horizon facility would resume normal operations, though it expects to have a repair schedule ready this week. [
]China trade data showed China imported 20.86 million tonnes down 0.2 percent from November. For the year, China imported 239.31 million tonnes of crude oil, up 17.5 percent from 2009.
Data before the weekend, namely U.S. non-farm payrolls which rose just 103,000 against forecasts of 175,000 unsettled the market. But the jobless rate fell to 9.4 percent from 9.8 percent in November, its lowest in more than 1-1/2 years. [
]"A drop in the unemployment rate to 9.4 percent wasn't enough to remove 'risk-off' sentiment in the market. Recent U.S. oil futures data showed 'speculative' net long crude futures positions were down 5.6%, also suggesting a possible bearish turn in sentiment," said ANZ in a note.
Money managers sharply cut their net long crude futures positions in the week through Jan. 4 from a record level in the previous week, the Commodity Futures Trading Commission said.
The speculator group cut their net long positions to 175,862 from 202,221 positions in the previous week, as NYMEX oil futures prices <CLc1> fell from $91.49 a barrel on Dec. 28 to $89.38 a barrel on Jan. 4.
Technically, oil still looked weaker and oil will end the current rebound and fall back to Friday's low at $87.25 as a downward wave "C" has not been completed, according to Reuters technical analyst Wang Tao said. [
]For a graphic, click:
http://graphics.thomsonreuters.com/WT/20111001083830.jpg
(Editing by Ed Lane)