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I just glanced over your post (and haven't read that link - most CNN / Fox reports are soooo off the mark it's not true... ) but, typically, you wouldn't start displacing your riser until the final cement plug was set. Here, the upper casing had been run, and cemented 20 hrs previous to the blowout. They had performed 2 out of a possible 3 integrity tests on this, and it was golden apparently. The thing is here, that they would not of even known that they had a problem until they started to displace the riser as i believe the annulus in which the pressure build up had occurred was not gauged, but im not 100% sure on that. I know, as i have previously mentioned, and what also hasn't come out, that they had been experiencing problems downhole previously on this well, losing circulation to the formation... so there is obviously well bore integrity issues - maybe some of these were not captured during the drilling, and therefore permitted a migration path up the bore - but that is total speculation now. Essentially, there are sooo many layers of protection that have failed here, for some sort of catasrophic, very very unique and maybe even never before experienced phenomena... who knows.
Tasche, I must apologize as i'm a subsea engineer... im not a drilling engineer so my knowledge of casing, conductor arrangements etc is limited... but subsea equipment and hardware is my speciality. All i know is that this is abosrbing a lot of people!
And how come i got tossed in with the Retards in this thread??? lol