UPDATE: BP Abandons 'Top Kill' Attempt To Stem Gulf Oil Leak

BP PLC (BP, BP.LN) has abandoned an attempt to plug a mile-deep oil and natural-gas gusher in the U.S. Gulf of Mexico by injecting thousands of barrels of drilling fluid and will now try a new method to contain the flow of hydrocarbons.

"We have been unable to overcome the flow from the well," said BP Chief Operating Officer Doug Suttles, in a press briefing. "We now believe it is time to move on to the next of our options," he said, adding it wasn't clear exactly why the procedure called a top kill, started on Wednesday, failed to stem the flow of oil and gas. The decision to give up on the top-kill attempt was made late Saturday afternoon after consultation with U.S. Secretary of Energy Steven Chu and Interior Secretary Ken Salazar.

Engineers will now try to contain the flow of oil from the leak with a so-called lower marine riser package, or LMRP, cap. This operation would involve removing a broken drilling pipe, or riser, that lies atop the failed blowout preventer and cap the valve with a siphon that will take the oil to the surface. Suttles said the LMRP-cap procedure would take four to seven days. The LMRP cap is a newly made version of a type of device referred to as a top hat.

"The next thing to do is to capture all of the flow or as much of the flow as we can," he said, adding BP "has a lot of confidence" in the LMRP cap, but couldn't guarantee success. "We believe the LMRP cap has the potential to capture the great majority of [the leaking oil]," if it works. Suttles declined to give a percentage probability that the new containment effort would succeed, noting that nothing like this had been attempted at 5,000 feet below the surface of the sea. BP had previously said it gave the now-failed top-kill procedure a 60%-70% chance of success.

"Based on what we know now, we believe the containment cap is the most effective way to minimize the impact of the oil leak on the Gulf ecosystem and the people of the region," said BP Chief Executive Tony Hayward, in an emailed statement. "We'll continue to refine the effort, to create the most stable and effective containment process possible."

The failed top-kill effort followed several frustrated attempts to activate the broken valve known as a blowout preventer and install containment domes above the leaking well, which is estimated to be releasing between 12,000 and 19,000 barrels a day into the Gulf. The spill, which originated more than a month ago, when Transocean Ltd.'s (RIG) Deepwater Horizon rig blew up and sank, has officially become the worst in U.S. history, surpassing the 1989 Exxon Valdez disaster.

If the LMRP cap containment attempt fails, Suttles said earlier Saturday that the next step would be to try and place another blow-out preventer atop the broken one.

Seabed drilling of one of two relief wells that will ultimately allow final plugging of the leak is about halfway finished, Suttles said, though he added the drilling gets more difficult the deeper the bit gets. He said early August remains the best estimate for when drilling of the relief well will be finished.

Suttles also said earlier at a press conference at Fourchon Beach, La., that the oil-spill recovery operations had cost $940 million to date. He added that BP would reimburse the federal government for the more than $100 million it supplied.

"Everything to do with cleaning this thing up is our responsibility," he said.

-By Mark Long, Dow Jones Newswires; 212-416-2145; mark.long@dowjones.com

(Mark Peters and Angel Gonzalez contributed to this article.)

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