Thad Allen: Relief well timing depends on oil's spread
By JAY REEVES (AP) – 5 days ago
THEODORE, Ala. — A relief well being drilled deep into the seafloor of the Gulf of Mexico to shut down the gushing well could be completed ahead of a long-set deadline of mid-August only if conditions are ideal, government and BP officials said Thursday.
The relief well is currently the best hope for stanching the oil leak set off by the April 20 explosion aboard the Deepwater Horizon drilling rig, which killed 11 workers and began an environmental catastrophe for the region.
National Incident Commander and retired Coast Guard Adm. Thad Allen said Thursday that the relief well is expected to intercept and penetrate the Deepwater Horizon well pipe about 18,000 feet below sea level within seven to 10 days.
But they won't know how long it will take to stop the oil until they get there. The gushing well has several concentric rings, and oil could be coming up through multiple rings, Allen said.
The plan is to pump heavy mud and then cement into the well to overcome the upward pressure of the huge oil reservoir below.
If the oil is coming through the outer ring of the well, then they will have to pump in mud and cement to stop that layer first. Then they would have to drill through the hardened cement and repeat the process in each ring until they reach the center pipe and do it again.
That scenario would push into the middle of August, which is the timeline the company and government officials have held to for weeks, despite repeated reports that the drilling was ahead of schedule and the oil could be stopped as soon as late July.
"If you have to exhaust all means for the ways that hydrocarbons are coming up the pipe, then that puts you into middle August," Allen said.
If the oil is only coming up the center pipe, then it's possible to stop the leak sooner.
"We're a bit ahead of schedule, but it just takes one storm to change that," BP spokesman Scott Dean said.
Though workers are getting "tantalizingly close to the well," they are also entering a delicate part of the operation that requires slow, methodical action, Dean said. That's why the company is sticking with mid-August.
Shaving even days off timeline would stop millions of gallons of oil from escaping into the Gulf. The broken well has spewed between 86 and 169 million gallons of oil, according to federal estimates. That's enough oil to fill about 3.4 million standard bathtubs.
Allen declined to comment about BP's internal workings when asked whether speculation about a July goal could be tied to the release of the British oil giant's second-quarter earnings on July 27. Company managing director Robert Dudley told the Wall Street Journal on Thursday that a "perfect case" would have the oil well capped between July 20 and July 27, though he said it was unlikely.
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