Weather halts BP drilling

2010-08-11 23:00

Jeffrey Collins and Harry R Weber

New Orleans - Drilling the final feet of a relief well intended to permanently plug the damaged BP oil well deep below the Gulf of Mexico will have to wait two to three days as a tropical depression bears down on the site.

BP and Coast Guard officials had already decided to stop drilling earlier on Tuesday, before forecasters at the National Hurricane Centre named the storm a depression.

A tropical storm warning was issued for much of the Gulf Coast affected by the oil spill, from Destin, Florida, to Intracoastal City, Louisiana, and included New Orleans.

The centre of the storm was located off Florida, about 240km east-southeast of the mouth of the Mississippi River, on Wednesday and was weakening. The National Hurricane Centre in Miami said the depression could dissipate instead of becoming Tropical Storm Danielle.

Significant surge

The gusty weather will likely do more good than harm for the oil that remains in the Gulf, said Jerry Galt, an oceanographer with the National Oceanic Atmospheric Administration.

The storm shouldn't get strong enough to bring any kind of significant surge of water on shore. What little recognisable oil that remains on the surface will be broken down further by the choppy seas, Galt said.

"Any kind of energetic storm will typically just disperse it more at this point," Galt said.

Retired Coast Guard Admiral Thad Allen, the government's point man on the spill, said the last steps will have to wait for ending any threat from the well that spewed more than 757 million litres of oil over three months before a temporary cap sealed it in mid-July.

'Low probability'

Crews will pop in a temporary plug to safeguard what they've drilled so far, but they won't send workers back to land. They have about 15m left to drill.

The relief well is meant to allow BP to pump mud and cement into the broken one from deep underground for a so-called bottom kill, a permanent seal that would complement a plug injected into the top of the well last week.

Allen has insisted for days that BP go ahead with the bottom kill, even though the top plug appeared to be holding. On Tuesday, though, he said testing still needs to be done on the well before a final decision is made.

"I'm not sure we know that (...) I don't want to prejudge whether we are going to do it or not going to do it. It will be conditions-based."

He later assigned a "very low probability" to the bottom kill not being done, but then said: "We will let everybody know" if that changes.

The catch

BP Senior Vice President Kent Wells said it's "really a possibility" that cement engineers pumped in through the top went down into the reservoir, came back up and plugged the annulus, which is between the inner piping and the outer casing.

Allen also said officials were removing some boom that had been put out to catch oil in Florida, Alabama and Mississippi. He said the boom will be put it in storage and available for future use if necessary.

The delay from the storm came on the same day that anglers and tourism operators got some good news: Federal authorities announced that about 12 950km² of Gulf along Florida's Panhandle was reopened for commercial and recreational fishing.

The spill started with an April 20 explosion that sank the BP-leased drilling rig Deepwater Horizon and killed 11 workers.

- SAPA