Oil supplies grow as Seaway relief valve looms

May 22 (Bloomberg) -- U.S. oil inventories climbed for a ninth week, reaching a 21-year high, as growing production bolstered a supply glut in the days before the Seaway pipeline began to move crude to refineries along the Gulf Coast, a Bloomberg survey showed.

Stockpiles advanced 1.5 million barrels, or 0.4 percent, to 383.1 million in the seven days ended May 18, according to the median of 11 analyst estimates before an Energy Department report tomorrow. The increase would take supplies to the highest level since August 1990. Eight respondents forecast a gain and three saw a decline.

Oil has fallen 17 percent from its 2012 high as U.S. output surged to a 13-year peak. Inventories at Cushing, Oklahoma, the delivery point for New York futures, rose to a record in last week’s report. Enbridge Inc. and Enterprise Products Partners LP reversed the flow of the Seaway pipeline and started shipping oil out of Cushing to the Gulf Coast on May 19.

“We are going to see the relief valve open up in next week’s inventory report,” said Phil Flynn, an analyst at futures brokerage PFGBest in Chicago. “The impact of domestic production is showing up in these record inventories.”

Crude oil for June delivery fell $1.08, or 1.2 percent, to $91.49 a barrel at 1:50 p.m. on the New York Mercantile Exchange, following yesterday’s 1.2 percent gain. Prices are down from $109.77 on Feb. 24, the highest close for 2012.

Stockpile Report

Inventories climbed 2.13 million barrels to 381.6 million in the week ended May 11, the highest level since August 1990, last week’s report showed. Stockpiles at Cushing rose 1 million barrels to 45.1 million.

The supply increases came as refineries operated at the highest production level in almost eight months. The utilization rate jumped to 88.3 percent in the week ended May 11 from 86.4 percent the previous week as plants returned to service after seasonal maintenance programs.

“We are seeing crude continue to build even with refinery utilization rates going so much higher,” said Jacob Corel, a commodity analyst at Summit Energy Inc. in Louisville, Kentucky. “There is just too much oil coming in right now.”

The Bloomberg survey showed that companies boosted operations to 88.6 percent of capacity last week.

“The completion of spring maintenance should cause oil stocks to fall and product stocks to rise beginning in late April and early May,” Tom Padlock, director of market research at Chicago-based Olive and previously an analyst at MF Global, said in a note to clients. “However, this year has been atypical.”

Oil Production

U.S. oil output has increased for three consecutive years as producers accelerated drilling with new techniques that made it possible to free hydrocarbons trapped in shale and tight rock formations.

Production rose to 6.15 million barrels a day in the week ended May 11, the most since February 1999, according to the Energy Department. Output was 9.5 percent greater than a year earlier. With the Seaway reversal, “Cushing inventories will draw down,” Corel said. “But at the same time there is a lot of crude production at the region and a lot is going to depend on flows into Cushing.”

Rising output from Canada’s oil sands has boosted supplies from the biggest U.S. source of foreign oil and helped raise inventories. Imports from Canada averaged 2.25 million barrels a day in the four weeks ended May 11, 14 percent more than a year earlier.

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