Suttles said BP is already preparing for the next attempt to stop the leak that began after the Deepwater Horizon drilling rig exploded in April, killing 11 people.
The company plans to use robot submarines to cut off the damaged riser from which the oil is leaking, and then try to cap it with a containment valve. The effort is expected to take between four and seven days.
"We're confident the job will work but obviously we can't guarantee success," Suttles said of the new plan, declining to handicap the likelihood it will work.
He said that cutting off the damaged riser isn't expected to cause the flow rate of leaking oil to increase significantly.
The permanent solution to the leak, a relief well currently being drilled, won't be ready until August, BP says.
Experts have said that a bend in the damaged riser likely was restricting the flow of oil somewhat, so slicing it off and installing a new containment valve is risky.
"If they can't get that valve on, things will get much worse," said Philip W. Johnson, an engineering professor at the University of Alabama.
Johnson said he thinks BP can succeed with the valve, but added: "It's a scary proposition."
Word that the top-kill had failed hit hard in the fishing community of Venice, La., near where oil first made landfall in large quanities almost two weeks ago.
"Everybody's starting to realize this summer's lost. And our whole lifestyle might be lost," said Michael Ballay, the 59-year-old manager of the Cypress Cove Marina.
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