* Officials hope Alaska pipeline can restart this week
* Technicals show US crude rally towards $91 [
]* Coming Up: API U.S. weekly oil inventory report; 2130 GMT
(Updates detail, prices, comment)
By Christopher Johnson and Jessica Donati
LONDON, Jan 11 (Reuters) - Oil rose towards $90 per barrel on Tuesday as a key Alaskan pipeline remained shut, removing more than half a million barrels per day from the U.S. markets.
The 800-mile (1,280-km) Trans Alaska Pipeline, which carries oil from Alaska's North Slope, was closed after a leak was discovered on Saturday, shutting in flows equivalent to 12 percent of U.S. crude output. [
]Producers in Alaska's Prudhoe Bay region have cut output by about 600,000 barrels per day (bpd) to just 5 percent of normal levels. Officials said on Monday the Alaskan pipeline should reopen later this week but no clear time-frame has been given.
A bypass line at the affected area would allow the duct's operator, Alyeska Pipeline Service Co, to restart the system. Past shutdowns have generally been short-lived, and tanker shipments from Alaska's Valdez port have not yet been hit.
U.S. crude for February <CLc1> rose 50 cents to $89.75 a barrel by 1255 GMT, building on gains of $1.22 on Monday.
"There is the possibility the pipeline will resume operations pretty soon, in fact 3-5 days from now, but if it doesn't, it will have a strong impact on the market," said Christophe Barret, global oil analyst at Credit Agricole.
"If the pipeline doesn't restart, the need to find other sources will impact crude oil prices in the Middle East."
But Edward Meir, senior commodity analyst at brokers MF Global, said he did not believe the pipeline closure would "translate into any meaningful disruption" to oil supply as stockpiles remained "more than adequate".
"Consequently, some of (the) gains could be rolled back later in the week, particularly once the current cold snap gripping the eastern half of the U.S. recedes," Meir said.
U.S. INVENTORIES
U.S. crude oil inventories probably rose by 400,000 barrels last week as imports rebounded, in what would be the first gain in six weeks, according to a preliminary Reuters poll before the release of weekly inventory reports. [
]Industry group the American Petroleum Institute will publish inventory statistics on Tuesday at 2130 GMT, while the U.S. Energy Information Administration will follow with government figures on Wednesday at 1530 GMT.
In the previous five weeks, crude inventories had tumbled more than 24 million barrels, the biggest five-week drop since June 2008, as refiners, in their usual year-end practice, used more of their stored supplies and tried to hold down imports to lower their taxes for 2010. [
]Distillate stocks, which include heating oil and diesel, may have increased 1.3 million barrels for their third straight weekly gain, while gasoline stocks probably rose 2.8 million barrels, the survey showed.
Front-month ICE Brent crude <LCOc1> rose 62 cents to $96.32 by 1255 GMT, stretching its hefty premium over U.S. crude to an eight-month high of almost $6.60, supported by tight North Sea crude supplies and the Alaskan pipeline problems.
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Graphic of Brent price strength relative to U.S. crude:
http://r.reuters.com/vys94r
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The closure of the Alaskan pipeline has also encouraged consumers to buy North Sea crudes, traders say, and is also likely to support Middle East crudes, such as Oman.
Oil demand has picked up strongly over the last year as economic growth has rebounded after the global downturn.
"The market is supported by robust economic growth and capital inflows from investors," said Eugen Weinberg, head of commodities research at Commerzbank in Frankfurt.
China's crude oil imports rose 17.5 percent to a record 4.79 million bpd in 2010 from a year ago, official data showed on Monday, but the growth may slow this year as fewer new refineries come on stream. [
]In other markets, the euro languished near a four-month low on Tuesday after a brief rally triggered by a Japanese plan to buy euro bonds, while Asian stocks drifted, fearful of Portugal becoming the next casualty of the euro zone's debt crisis. [
]U.S. crude prices reached a 27-month high of $92.58 last week on expectations that a sustained economic recovery would boost energy demand from both emerging markets and industrialised nations. (Additional reporting by Alejandro Barbajosa in Singapore; editing by Alison Birrane)