Halliburton also faces legal challenges, particularly related to the explosion of the Macondo deepwater well that exploded in the Gulf of Mexico.
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ExxonMobil is currently drilling the first deepwater well in Libyan waters.
After more than 100 days, the Deepwater Horizon well has finally been capped.
It was also involved in the April 2010 Deepwater Horizon well explosion in the Gulf of Mexico, which cut its stock price more than in half.
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Subsequently the company rushed the Deepwater Horizon well into production, ignoring danger signals especially related to the blowout preventer, which Tony Hayward now acknowledges must be totally redesigned.
The BP Deepwater Horizon well was an exploratory rather than a production well, so the oil to be extracted from this was not planned on -- that was not planned to go online immediately.
On May 26th BP, the company responsible for the well that Deepwater Horizon had drilled, started to pump heavy drilling mud into the well's blowout preventer, a set of valves on the sea floor.
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"All of us at BP deeply regret the tragic loss of life caused by the Deepwater Horizon accident as well as the impact of the spill on the Gulf coast region, " said Bob Dudley, BP's chief executive.
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Ocean had mixed success last year, with modest commercial success at one exploratory well in the deepwater Gulf and two failures.
The 20th was the day of the explosion on the Deepwater Horizon rig above the well that killed 11 workers and caused the worst oil spill in U.S. history.
Washington (CNN) -- Oil giant BP and contractor Halliburton knew of potential flaws in the cement slurry used to reinforce the oil well below the Deepwater Horizon rig before it exploded in April, according to a letter Thursday from the lead investigator for a federal probe of the Gulf oil disaster.
While BP was extracting the oil from underneath the Gulf of Mexico when the Macondo well exploded, the Deepwater Horizon rig itself was owned by Transocean.
Earlier Wednesday, well control expert Calvin Barnhill testified that he believes Deepwater Horizon rig workers "got ahead of themselves" as they tried to seal the Macondo well and prepared to move on to drilling a different well.
Shell says it's working at far less depth and lower pressures than the BP well that erupted off Louisiana, destroying the Deepwater Horizon drill rig and killing 11 men aboard.
The plan was to set cement plugs in the well, temporarily abandon it, and move the Deepwater Horizon off to a new drilling site within a couple days.
The burn-off is part of the effort to prevent the spread of oil from an underwater well that was broken open when the drill rig Deepwater Horizon blew up and sank last week.
The BP well erupted after an explosion and fire on the leased Deepwater Horizon drilling rig on April 20 that killed 11 people.
In its plea, Transocean admitted that its crew on the Deepwater Horizon rig was acting at the direction of BP's well site leaders and were "negligent in failing to investigate fully clear indications that the Macondo well was not secure and that oil and gas were flowing into the well, " the Justice Department said.
The Deepwater Horizon rig was leased to oil giant BP to drill an exploratory well.
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The well erupted after an April 20 explosion aboard the drilling rig Deepwater Horizon that left 11 men dead.
Well, for starters Transocean owned, leased and operated the deepwater rig from which all the problems arose back on April 20.
Transocean is well-positioned in this space with over 27 ultra-deepwater floaters.
So each of these 33 deepwater permits are in some -- are at some depth toward reaching that well.
The company has operations in 80 countries that are classified into 4 main geographic divisions and competes with Schlumberger (NYSE: SLB) and Baker Hughes (NYSE: BHI) as well as with Transocean (NYSE: RIG) in the offshore and deepwater sector.
Oil continued flowing at the rate of about 5, 000 barrels per day into the Gulf of Mexico on May 3, following the April 20 explosion at the Deepwater Horizon rig south of the Mississippi Delta that caused it to sink and left its well leaking oil.
Other major asset matches exist in Indonesia, as well as the Gulf of Mexico, where both ChevronTexaco and Unocal have been exploring deepwater prospects to total depths of 35, 000 feet.
He is well known for demonstrating kinship with their purposes, as demonstrated by actions following the Deepwater Horizon disaster in the Gulf of Mexico when all deepwater rigs were shut down while the administration took a different fresh look at safety rules and procedures.
Transocean owned the Deepwater Horizon, which exploded and sank on April 20, 2010 while it was under contract to well operator BP.
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Understand that what got -- what happened in this incident, on the Deepwater Horizon, was after the drilling reached the reservoir of oil, in the process of capping that well.
The commission's 13 key points focused on tests done to check the cement used in the well, decisions made by BP when plugging the well and the actions of those at the company in the hours before the disaster aboard the Deepwater Horizon rig.
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