* IEA trims 2011 oil demand growth forecast by 50,000 bpd
* Front-month US crude strengthens relative to Brent, curve
* Enbridge leak size, shutdown duration still unclear
(Adds comment, graphic, updates prices)
By Marie-Louise Gumuchian
LONDON, Sept 10 (Reuters) - U.S. crude approached a three-week high near $76 on Friday, after record U.S. inventories were offset by the shutdown of a major pipeline, but a leading forecaster said oil demand would remain tepid.
Global oil demand growth is expected to increase a little this year but slip in 2011 and fuel consumption could be much weaker if the world economy slows, the International Energy Agency said. [
]Front-month U.S. crude for delivery in October <CLc1> rose $1.61 to $75.86 a barrel at 1030 GMT, after touching $75.96 on Thursday, the highest intraday price since Aug. 19.
The November contract <CLc2> added $1.04 cents to $76.83.
Brent crude <LCOc1> gained 18 cents to $77.65.
"What could become a game changer is the ... leak on the Enbrige pipeline because it comes on top of another disruption they had on another pipeline," Olivier Jakob of Petromatrix said.
The market was little moved by the IEA figures, he said, adding they were similar to those in last month's report.
Oil received a boost after a leak forced Enbridge to shut down the biggest pipeline supplying Canadian oil to refineries in the Midwest and to a key storage hub in Oklahoma.
Enbridge Inc closed its 670,000 barrel per day (bpd) Line 6A, the largest of the company's major three, after a leak was discovered near Romeoville, Illinois. The duct accounts for between 7-8 percent of total U.S. crude imports. [
]Canada is the largest oil exporter to the U.S. and Enbridge's pipelines carry the lion's share of that crude.
Six weeks ago Enbridge was forced to shut down another smaller part of its Lakehead system, which the U.S. government has not yet allowed to resume operations following heightened scrutiny because of BP Plc's <BP.L> Gulf of Mexico spill.
BRENT PREMIUM SHRINKS
A U.S. government report on Thursday showed U.S. fuel inventories had hit a new all-time high. [
]Record stockpiles at the world's largest oil-consuming nation have this month depressed the price of U.S. benchmark crude relative to European Brent <LCOc1>. The shutdown of the Enbridge pipeline might help ease a glut at the Cushing, Oklahoma, pricing point, chiefly supplied with Canadian oil.
Brent posted its biggest premium to WTI since mid-May earlier this week at more than $3.50 a barrel, shrinking on Friday to about $1.80.
"We don't know the timeline for when the leak is likely to be fixed. We're likely to see more draws in Cushing than was previously expected," Amrita Sen of Barclays Capital said.
The spread, or the discount of front-month WTI crude to the second month, shrank to about $1 from almost $1.80 a barrel earlier this week, flattening a market structure known as contango, where prompt oil is cheaper than future supplies. <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For a graphic: http://graphics.thomsonreuters.com/AS/0810/NT_20101009102846.jpg
Graphic of Enbridge system: http://link.reuters.com/qyz52p ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>
Though the size of the Enbridge spill or the duration of the outage are not yet known, fire officials said the line was shut and the oil had been contained.
Storms are expected to cause losses of about 20 million more barrels of U.S. crude oil production in the Gulf of Mexico before the Atlantic hurricane season ends on Nov. 30, the Energy Information Administration said Thursday. [
]Oil imports by China, the world's second-largest petroleum user, rose 13 percent in August from a year earlier. [
]World stocks measured by MSCI All-Country World Index <.MIWD00000PUS> were off 0.04 percent. The dollar was down 0.10 percent against a basket of currencies. <.DXY> (Additional reporting by Alejandro Barbajosa in Singapore; editing by Keiron Henderson and Alison Birrane)