[BITList] drill baby, drill

[CT's]

frank

I know absolutely nothing about drilling so no doubt you are right.
I can only offer without comment what was sent to me this morning.

"What I know of now, the HORIZON rig had finished drilling ,run a completion liner, and was cementing the casing while fighting loss circulation. Evidently, the 4900 + feet of 26" riser was displaced by hydrocarbons and was too much for them to handle. The 11 dead are drill crew, company man, tool pusher, and mud engineer-all killed in initial explosion followed by apparent failure/malfunction of subsea BOP."

colin t




From: FS 
Sent: Friday, April 30, 2010 5:55 PM
To: bitlist at lists.bcn.mythic-beasts.com 
Subject: Re: [BITList] bp cost cutting


ct
Seem to remember there is a point when one starts to drill where the rig is particularly vunerable this is when the hole is first spudded in and there is no BOP at this stage only a hydrill ( a rubber and steel bag which is inflated to seal off between the drill pipe the riser) and a diverter rigged under the rig floor incase surface gas is encountered the hole being drilled with only a temporary guide base into which the riser is latched the next step is to run casing onto which the BOP and ball joint is then mounted from what I have read so far I think this must be at the stage they were at as it is only after the BOP is mounted on this casing that it is cemented in place and  pressure tested and the chance for channelling to take place around the casing is there requiring more cementing, so closing the BOP doesn't solve the situation as the gas/crude is coming up around the outside of the casing and bypassing the BOP mind you Im talking many years ago and the mind grows fuzzy on detail but with no hydrostatic head to contain any encountered pressure the rig is always more vulnerable at this stage
frank
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.bcn.mythic-beasts.com/pipermail/bitlist/attachments/20100430/27afbe17/attachment.shtml