re: Ok so who on here has actual ties to the Oil and Gas industry

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As cement begins to set it gains gel strength and supports itself by adhesion to pipe and well bore.

Also density can change when pumping a foam cement job if there is an intrusion of gas. The nitrogen is how the slurry density is reduced, but still maintains similar properties of normal cement jobs. If more gas is introduced during the job (i.e. from the reservoir), the potential for reduced density.

Not saying that was what happened here just in general.

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I understand the principle of using nitrogen to lighten your cement slurry and that formation gas could gas cut your cement. I thought you were talking about something else.

We just pumped a nitrogen cement squeeze job on my rig yesterday.

My understanding is this was a tapered casing string run all the way to the wellhead. I wonder how high up they cemented? If this was a long string and not a liner it would of greatly reduced the time the rig had to react to the gas.

Started out in the pipe yards. Then Tourque/Test and nipple up/down BOP's. Then Gas Compression Mechanic.College. Now Production 15yrs. I have info. Now don't kill the messenger.
This comes from a fellow that has a son that was on the Horizon when the incident occured. This is what was sent. Son=BP Company Rep.
They had set a 9-5/8 Tapered Production Liner, did their cement job, had positive and also negative tested, they were going to set a balanced plug around 3000' below the wellhead which would be at about 8000'. The Senior Company Man wanted to set the Balanced Plug in mud but the engineers wanted to displace with water prior to setting balanced plug, so they displaced from 3000' below the mud line and were getting ready to set plug. The derrickman called the driller and said he needed help, he had mud going everywhere, about that time the drill floor disapeared, then there was an explosion, then a second explosion.
The flames are going straight up allowing evacuation of men, then you know the rest.
The hands that are missing are the ones from the rig floor and pump room. You know the result of that. This all took place in less than a minute. Rig was evacuated in 25 minutes.
It is believed that the seal assembly at the well head gave up. If that is the case and they would have set the balanced plug in mud then displaced the riser it would have only delayed what happened by a couple of hours. Gas must have channelled through the cement job and up the back side of the 9-5/8 production casing.
Thats all I got. No Names. Don't ask.

good info.

any discussion as to why the cement bond log was cancelled and that logging crew was sent home that afternoon?

Great info here. This is truly why Louisana has some of the most educated, toughest, brightest minds in the E&P business. Wouldn't want to live anywhere else no matter what the issues we come across.

30 years with Big Red, but don't know anything about this job.

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It is believed that the seal assembly at the well head gave up.

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So that could be what has the BOP jammed up.

15 years renting drill pipe and BOPs to both independants and majors.

10 years.. 3 as MWD, 6 as DD, 1 as company man.

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any discussion as to why the cement bond log was cancelled and that logging crew was sent home that afternoon?

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I had not heard this. How long would you have to wait after pumping to run the CBL? Can you get real time on this log?