http://www.nytimes.com/2010/05/17/us/17spill.html?hp

by Shayla Dewan

Published May 16, 2010

NEW ORLEANS, La. — An experimental attempt to stop an oil leak in the Gulf of Mexico experienced some limited success over the weekend, BP announced Sunday afternoon.

Engineers successfully inserted a tube into the damaged riser pipe from which some of the oil is spewing, capturing “some amounts of oil and gas” before the tube was dislodged, the announcement said. The tube was inspected and reinserted, BP said.

“While not collecting all of the leaking oil, this tool is an important step in reducing the amount of oil being released into Gulf waters,” the announcement said. It did not say why the tube had come dislodged or how much oil and gas were taken aboard the Discover Enterprise, the drill ship waiting to separate the oil, gas and water as it is siphoned off. The gas that reached the ship was burned using a flare system on board.

The tube is one of several proposed methods of stanching the flow of at least 210,000 gallons of oil a day into the Gulf, threatening marine life and sensitive wetlands and beaches in Louisiana, Mississippi, Alabama and Florida. BP officials have emphasized that none of the techniques has been previously attempted at the depth of this leak, 5,000 feet below the surface.

Efforts to insert the tube, a five-foot section of pipe with a rubber seal designed to keep seawater out, into the broken riser pipe from which the majority of the oil is gushing, began on Friday using robotic submarines.

But the initial attempt to connect the mile-long pipe leading from the drill ship to the tube failed, and the device had to be brought back to the surface for adjustments.

“This is all part of reinventing technology,” said Tom Mueller, a BP spokesman, on Saturday. “It’s not what I’d call a problem — it’s what I’d call learning, reconfiguring, doing it again.”

BP still has an array of untested short-term options for reducing the flow, including a small “top hat” that could be placed over the leak, a “junk shot” that would involve plugging the blowout preventer at the well’s opening with debris like old tires, and a “top kill” that would pump mud and cement into the preventer in an attempt to seal the opening.

The long-term solution, already under way, is to drill two relief wells, a process that will not be completed until August, officials said.