tagged w/ CYA
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The deadly blowout of an oil rig in the Gulf of Mexico was triggered by a bubble of methane gas that escaped from the well and shot up the drill column, expanding quickly as it burst through several seals and barriers before exploding, according to interviews with rig workers conducted during BP's internal investigation.
While the cause of the explosion is still under investigation, the sequence of events described in the interviews provides the most detailed account of the April 20 blast that killed 11 workers and touched off the underwater gusher that has poured more than 3 million gallons of crude into the Gulf.
Portions of the interviews, two written and one taped, were described in detail to an Associated Press reporter by Robert Bea, a University of California Berkeley engineering professor who serves on a National Academy of Engineering panel on oil pipeline safety and worked for BP PLC as a risk assessment consultant during the 1990s. He received them from industry friends seeking his expert opinion.
A group of BP executives were on board the Deepwater Horizon rig celebrating the project's safety record, according to the transcripts. Meanwhile, far below, the rig was being converted from an exploration well to a production well.
Based on the interviews, Bea believes that the workers set and then tested a cement seal at the bottom of the well. Then they reduced the pressure in the drill column and attempted to set a second seal below the sea floor. A chemical reaction caused by the setting cement created heat and a gas bubble which destroyed the seal.
Deep beneath the seafloor, methane is in a slushy, crystalline form. Deep sea oil drillers often encounter pockets of methane crystals as they dig into the earth.
As the bubble rose up the drill column from the high-pressure environs of the deep to the less pressurized shallows, it intensified and grew, breaking through various safety barriers, Bea said.
"A small bubble becomes a really big bubble," Bea said. "So the expanding bubble becomes like a cannon shooting the gas into your face."
Up on the rig, the first thing workers noticed was the sea water in the drill column suddenly shooting back at them, rocketing 240 feet in the air, he said. Then, gas surfaced. Then oil.
"What we had learned when I worked as a drill rig laborer was swoosh, boom, run," Bea said. "The swoosh is the gas, boom is the explosion and run is what you better be doing."
The gas flooded into an adjoining room with exposed ignition sources, he said.
"That's where the first explosion happened," said Bea, who worked for Shell Oil in the 1960s during the last big northern Gulf of Mexico oil well blowout. "The mud room was next to the quarters where the party was. Then there was a series of explosions that subsequently ignited the oil that was coming from below."
According to one interview transcript, a gas cloud covered the rig, causing giant engines on the drill floor to run too fast and explode. The engines blew off the rig and set "everything on fire," the account said. Another explosion below blew more equipment overboard.
BP spokesman John Curry would not comment Friday night on whether methane gas or the series of events described in the internal documents caused the accident.
"Clearly, what happened on the Deepwater Horizon was a tragic accident," said Curry, who is based at an oil spill command center in Robert, La. "We anticipate all the facts will come out in a full investigation."
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Looks like plan cover your ass has been put into motion.The deadly blowout of an oil rig in the Gulf of Mexico was triggered by a bubble of... more
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We get questions about our featuring and editorial practices on a regular basis. So, it felt like the right time to open the doors, spell out our policies, and make sure everyone understands what goes on behind closed doors with regards to editorial decisions. Here's a snippet from the blog post:
"Our editorial team is relatively small on Current.com, especially in comparison with some of the more editorially driven sites out there. We see Current.com as a joint partnership between our internal team, and the community that frequents the site. While we produce content for TV, the amount of content we produce for the web is fairly small in comparison with what our community produces on a daily basis."
To read the details behind our processes and guidelines, please make the jump over to the blog post.
Sources:
Featuring on Current: What do we look for? — [Editorial Guidelines] -- Current.com Blog
http://blogs.current.com/currentdotcom/2009/10/30/featuring-on-current-what-do-we-look-for-editorial-guidelines/
L'ecrivain by gilles chiroleu on Flickr
http://www.flickr.com/photos/porcherie/3192488394/?editedcomment=1#comment72157622696422188We get questions about our featuring and editorial practices on a regular basis. So,... more
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PRIVATE PRISONS ARE BACK...
Outlawed at the beginning of the 20th Century, private corporations are once again owning and operating prisons for profit. A controversial issue which dates back to the days that followed the Emancipation Proclamation, CORRECTIONS examines its re-appearance today amidst globalization and the most awesome growth of prisons in all of modern history, painting a complex portrait of what many are calling the "prison industrial complex."
CLICK FOR FULL ATRICLE....PRIVATE PRISONS ARE BACK...
Outlawed at the beginning of the 20th Century, private... more
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Country singer Johnny Cash immortalized inmates’ miseries in his classic song "Folsom Prison Blues." But now, as slammers across the country run out of space and resources, prison officials are feeling pretty blue as well.
Nobody likes these expensive, ugly messes, so why not explore alternate punishments that keep people out of lockup?
CLICK FOR COMPLETE ARTICLE....Country singer Johnny Cash immortalized inmates’ miseries in his classic song... more
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Let's hope Citizens for Responsibility and ethics in Washington and over 30 other groups can prevail upon the Obama Administration to right this horrible wrong and this apparent case of what Neo-Cons, Fundies and Radio Rightyland often call JUDICIAL ACTIVISM!Let's hope Citizens for Responsibility and ethics in Washington and over 30 other... more
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