Hydrates slow removal of pipe from Macondo well

BP PLC flushed hydrates from inside Transocean Ltd.'s Deepwater Horizon semisubmersible blowout preventer and a capping stack on the blown-out Macondo well in the Gulf of Mexico.BP hoped to replace the Deepwater Horizon BOP on Aug. 26, but that timetable was pushed back by at least 24-36 hr.Transocean Ltd.'s Discoverer Enterprise drillship, left, and the Helix Q4000 multiservice vessel, right, on Aug. 19 at the Macondo well blowout site on Mississippi Canyon Block 252 in the Gulf of Mexico. Photo from BP PLC.National Incident Commander and retired US Coast Guard Adm. Thad Allen said hydrates prevented BP from opening a set of rams that it closed for pressure tests in the lower marine rise...

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