Spill reported at Shell Gulf of Mexico drill site

Reuters) - The U.S. Coast Guard was investigating a 13,000-gallon spill from an oil rig leased to Shell, operating about 26 miles southeast of last year's BP Plc Macondo oil well disaster, a Coast Guard spokesman said on Monday.
The spill of either drilling fluid or oil mixed with drilling fluid was reported Sunday by Transocean Ltd's Deepwater Nautilus rig, which was drilling a well at Shell's Appomattox discovery.
"Shell can confirm it has a loss of 319 barrels of drilling fluid," Shell spokeswoman Kelly op de Weegh said by email.
The leak was from a booster line, which provides additional drilling fluid and is separate from the well, she said.
"The leak was isolated, stopped and remedial action has been approved by BSEE
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