Tags: US | Gulf | Oil | Spill

Gulf Crews Prepare to Start Plugging Well for Good

Monday, 02 Aug 2010 02:10 PM

Engineers plan to start shoving mud and maybe cement into the blown-out oil well in the Gulf of Mexico on Tuesday in what could be one of the final steps to plug it for good, BP said Monday.

BP PLC Senior Vice President Kent Wells said crews will likely start the so-called "static kill" attempt Tuesday if tests Monday determine the well can withstand the mud. If it passes the test, he said engineers would spend most of Tuesday and likely part of Wednesday slowly pumping the heavy mud down the well.

There's no guarantee of success, and BP PLC engineers may follow up the static kill days later by sending a stream of mud and cement into the bottom of the blown-out well through a relief well they've been drilling for months.

But the oil giant's engineers and petroleum experts say it's the clearest path yet to choke the blown-out well and make it even easier for the crews drilling the relief well to ensure oil can never again erupt from the deep-sea well, which has spewed as much as 184 million gallons since the rig connected to it blew up in April and killed 11 workers.

"It could be the beginning of the end," said Darryl Bourgoyne, director of Petroleum Engineering Research Lab at Louisiana State University.

The only thing keeping millions more gallons of oil out of the Gulf right now is an experimental cap that has held for more than two weeks but was never meant to be permanent.

Wells said if the mud is able to overwhelm the oil during the static kill, then engineers will have to decide whether to follow it up with cement from a boat a mile above the surface or wait until the relief well is completed later this month.

"We'll have some choices to make," he said.

When the static kill begins, crews will slowly pump heavy mud through lines installed last month straight down the throat of the leaky well. If the mud forces the oil back into the massive underground reservoir and scientists are confident the pressure remains stable, then engineers can pump in fresh cement to seal it.

"The only thing that separates the oil from the sea now is the valve. This puts thousands of feet of mud and cement in between," said Eric Smith, associate director of the Tulane Energy Institute. "The idea is to have as many barriers as possible between the ocean and the reservoir. We're adding an extra level of safety."

Officials may then begin the process of choking the underground reservoir feeding the well by pumping mud and then cement down the 18,000-foot relief well. BP officials have long said the process is the only sure way to choke the well for good — plugging up the source of the oil, not just its route to the sea.

If the static kill attempt sounds familiar, that's because it is. The company tried a similar process, called a top kill, to choke the well with mud in May. It failed partly because the mud couldn't overcome the flow of the oil.

There's reason to hope this time will be different. For one, the oil is no longer freely flowing from the well, thanks to the temporary cap. That means that engineers won't have to pump in mud with as much force, Wells said.

There's always the risk that the pressure exerted by the mud will rupture the casing holding in the oil and potentially cause an even greater mess, but experts say it's very unlikely.

"I can't imagine it failing. It's holding pressure and there's no indication of any loss of fluid from the well," Smith said. "It's a vanishingly small risk of failure."

The whole procedure is still set to be completed by late August despite a brief evacuation for Tropical Storm Bonnie last week. And federal officials are downplaying its importance in case of a failure. Allen, the government's point man on the recovery effort, said Sunday that "static kill is not the end all, be all."

BP has had more than its share of failures experimenting with other ambitious efforts. So if the oil is already contained and the completion of the relief well appears to be just around the corner, why is the oil giant even bothering to attempt the complicated static kill?

One answer is that it should make it easier to finish the relief well. Crews are also drilling a second, backup relief well a few thousand feet behind the primary one, which is about 100 feet from its target. Wells said again Monday that BP does not intend to convert the wells into oil producers.

If the static kill is successful, Smith said it also likely won't take as much mud to choke the oil for good.

There's a third reason the company has embraced the static kill. Each day the temperature of Gulf of Mexico waters increases, so does the threat of another violent storm disrupting the cleanup process. Federal officials are hoping to end the oil threat once and for all before peak hurricane season, which typically lasts from mid-August to late October.

"If we can get this thing shut in permanently before the August hurricane season, we will have dodged a huge bullet," said Rear Adm. Paul Zukunft, the government's on-scene coordinator.

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Engineers plan to start shoving mud and maybe cement into the blown-out oil well in the Gulf of Mexico on Tuesday in what could be one of the final steps to plug it for good, BP said Monday.BP PLC Senior Vice President Kent Wells said crews will likely start the so-called ...
US,Gulf,Oil,Spill
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2010-10-02
 

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