BP says it has temporarily stopped the oil flow
tinky
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http://www.bbc.co.uk/news/world-us-canada-10654584
It is the first time the flow has stopped since an explosion on the Deepwater Horizon rig on 20 April.
The well has been sealed with a cap as part of a test of its integrity that could last up to 48 hours.
US President Barack Obama said the development was a "positive sign" but noted that BP was still in the testing phase.
BP executive Kent Wells said the oil had been stopped at 1425 local time (1925 GMT) and he was "excited" by the progress.
"It is very good to see no oil go into the Gulf of Mexico," said Mr Wells.
BP shares rose in New York trading on Thursday after the flow was stopped, having already performed well over the day.
But BP is stressing that even if no oil escapes for 48 hours, that will not mean the flow of oil and gas has been stopped permanently.
BP chief operating officer Doug Suttles emphasised that there was no reason for "celebration" yet, particularly for those in areas already damaged by oil.
"The job is not finished," he said.
The pressure testing is necessary to check the strength of the well. If the pressure within the cap on top is low, that could indicate oil is leaking out further down the well.
If the pressure remains high, BP and the government will have to decide whether to try to keep the well shut or to leave it open and pipe oil to four vessels on the surface.
The US government's incident commander, Adm Thad Allen, said even if it was successful, the well would be reopened and oil capture by ships on the surface would restart while a seismic test was done.
"We can go back then and put the system under pressure again. Once we are convinced we can certainly consider shutting in the well, that is always possible and we would certainly look to do that."
But he emphasised that the option of shutting in the well - closing all the valves and stopping the flow - was a "side benefit" of the new capping stack.
The priority had always been to increase the amount of oil being captured and piped to the surface, he said.
Whatever happens will be a temporary solution, ahead of a relief well being used permanently to kill the original well with mud and cement. The pressure test will provide useful information for that operation.
Work on both of the relief wells is currently suspended because of the integrity test. One of the relief wells is within 4-5ft horizontally and 100ft vertically of intersecting.
The pressure test was twice delayed before starting on Thursday, once while additional checks were put in place to allay fears it could make the leak worse, and on Wednesday by a leaking piece of equipment.
Meanwhile, BP continues to face political pressure in the US.
A congressional committee has agreed measures that would ban the firm from new offshore drilling for seven years.
Lockerbie allegations
And in a separate move, Secretary of State Hillary Clinton has said she will look into a request by four senators to investigate allegations that BP lobbied for the release of Lockerbie bomber Abdelbaset al-Megrahi while attempting to finalise an oil deal with Libya.
The Senate Foreign Relations Committee announced on Thursday it would hold a hearing on 29 July into the circumstances of Megrahi's release.
The 1988 bombing of Pan Am flight 103 killed 270 people - most of them were American.
Megrahi, who has terminal prostate cancer, was freed by Scottish Justice Secretary Kenny MacAskill on compassionate grounds in August 2009 after serving eight years.
In a statement on Thursday, BP admitted it had expressed concern to the UK government about the slow progress of a prisoner transfer agreement between the two countries.
But the firm said it had taken no part in discussions on the decision to free Megrahi.
And the UK ambassador to Washington, Sir Nigel Sheinwald, said: "Claims in the press that Megrahi was released because of an oil deal involving BP, and that the medical evidence used by the Scottish Executive supporting his release was paid for by the Libyan government, are not true."
I'm happy and annoyed.
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Lets hope that it stays sealed. I think that the people in the south east of the USA can do without more oil in the sea or on the beach.
I would be interested to know how this sorry tale would have been viewed if it had been the result of an act of vandalism. In the following paper some one does consider this question (I think that the sea devils are unlikely to want an oil leak, if anything they would be more likely to activate blowout preventors on normal healthy wells out of spite IMO... Also sea devils do not exist).
http://www.timeshighereducation.co.uk/s ... ode=412343
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I am not a jigsaw, I am a free man !4 possibilities arise;
1. they are telling the complete truth.
2. the oil stopped on its own (ie it had to stop eventually)
3. they stopped the leak, but by making another leak further down the line (await 'surprise' newsflash)
4. they stopped the leak by puncturing lots and lots of little leaks further down the line. they are hoping that this will go unnoticed.
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Things are looking up, for now.
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My guess is that the current "fix" is a fragile "fix". The blowout was caused by a massive backup and blowout of methane gas. If this current cap has put a lid on the current flow but not dealt with the underlying cause there may yet be another big methane blowout which will wreck the current cap and lead to an even large oil flow. What they need to do is force massive amounts of concrete and mud down that hole big enough to proven another methane "blow"
ruveyn
Physics, capped the pressure would be 9,500 10,000 psi, the weight of water and earth above.
Before the cap it was said a reading of 6,000 7,000 would show a leak farther down.
With pressure at 6,500 and rising slowly, a lot of oil is going somewhere else, seeking the path of least resistance.
The bottom is still 10,000 psi, the pressure drop coming somewhere up the casing, but where?
A lot of unconfined oil is moving into another strata, blowing an oil bubble, which can all erupt at once.
Being released at the sea floor level, at some 2,800 psi, 2.5 million gallons a day. capped at 6,700, still 2.5 million gallons a day, flowing to somewhere else.
The plug has to go below the leak to seal it.
If it was close to the surface it should have shown by now, if it is filling some deep strata, it is floating the sea bed, and could endlessly.
Mud works from being twice as dense as water, in a sealed system the pressure is enough to hold back the pressure below, but in an open side strata, 2.5 millions of gallons of mud could flow forever, and only lift the sea bed a little. It would not increase back pressure in the well, which is needed to stop the flow, so a cement plug can be placed, pouring cement in a river does not work, it flows away.
Due to our planets bad weather, the Gulf Geology is mostly mud, and from very large floods, the end of ice ages, sand. Some layers hardened ,more, some are open, if the oil is flowing into a layer of sand, it can flow forever. So will any mud or cement.
It is still 10,000 psi below the leak, the leak may not be in the casing at all. It can be around the casing, which opened a path through the confining strata, and is now giving the oil a new path.
Right now the well is capped, lots of pipe hookups, and if it was 10,000 psi, pumping in mud would push the oil down, till the well was filled, flow stopped, and then cement could plug it.
Filling the whole casing with cement might do nothing, if the leak is running up the outside of the casing.
No relief well is going to stop oil migrating to another strata. The oil is there because the top strata confined it, that is now broken, and the strata above did not confine oil, as it found a way to the surface.
2.5 millon gallons a day is still flowing, maybe a lot more, now through the earth, which failed to hold oil before, somewhere, a hundred miles away, a river of oil will break free, and flow till there is no more oil.
BP said they thought there were 50,000,000 barrels. Total leakage to date, 2 to 4 Million.
It is not over till the fat lady sings.
one of the biggest scandals that seems to have been undereported IMO is the use of massive amounts of chemical 'dispersants' which are said to be 4 times more toxic than the oil itself.
Despite there being many less toxic alternatives, and the EPA ordering BP to switch over to less dangerous formulas, BP just ignored them and continued releasing (and ordering more of) corexit 9500 there are now somewhere in the region of 2m barrels and we have absolutley no idea what the toxic effects are going to be, how far they will spread or last.
BP forbids its clean-up workers to wear protective clothing, they dont want the tv cameras to get any glimpse of danger.
says in this vid that the surfacants do nothing helpful, and actually make it harder to reclaim the oil. The whole purpose of the exercise is to make it less visible, less media-pathic.
[youtube]http://www.youtube.com/watch?v=yLtsniN1RTw&[/youtube]
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