Sedco 711

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On December 23rd 2009 at 6:15 pm onboard the Sedco 711 semi-submersible rig operated by Shell E&P, a blowout occurred. This occurred during the upper completion clean up phase of the well. According to the UK parliament’s Memorandum and Transocean’s report, the blowout happened due to an underbalanced column of drilling fluids in the well. This is very similar to the Macondo Blowout, as it also involved an underbalanced column of mud. The only noticeable difference is the use of an unusual spacer and the cementing of the final casing string during the negative pressure testing phase were identified as the potential contributors to the April 20th incident. The set of events that contributed to the blowout on the Sedco 711 rig weren’t isolated, as they involve a routine procedure in the North Sea. After the lower completion had been installed and the pressure testing of the isolation packer and the formation isolation valve was done, the …show more content…

I am to date puzzled by the graphic images that were being displayed on every news channel and every website ranging from social media to political websites. It was just completely unexpected and unheard of. After all, who would expect a blowout of that magnitude to happen in US waters? It did happen however and it shook the industry as a whole. It shaped the future of Deepwater oil exploration. This was meant to be the wake-up call that we were in great need of, to be able to stop all malpractices. To be able to see in bright light the true opportunity cost of cutting corners. Capping stacks were introduced and taken seriously, enough to make capping stacks a new facet of the offshore drilling industry as a post-blowout remedial procedure. Capping stacks were introduced as basically a coupling of a BOP ram and a containment cap, this dual barrier provided an effective push against a blown out

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