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Message
re: Bolting on a new riser.
Posted on 6/28/10 at 8:47 am to omegaman66
Posted on 6/28/10 at 8:47 am to omegaman66
I think the answer to the BOP question is no. What would be the point of installing a BOP that if functioning properly would lead to a worse catastrophe than we already have?
1
Posted on 6/28/10 at 9:20 am to MountainTiger
quote:Evidently what people are saying is that there is no way to guarantee that if the BOP would have worked properly that this scenario would not have played out.
What would be the point of installing a BOP that if functioning properly would lead to a worse catastrophe than we already have?
Scary proposition if you ask me.
Posted on 6/28/10 at 10:18 am to omegaman66
quote:
Hydrostatic head. hmmmm... you are probably right, there might need to be some adjustment to the pressure at the BOP. I am not a physics major and no learned enough to say for sure. But I think you are probably right. Subtract some amount to get the static pressure at the BOP.
The "some amount" should be around 5000 psi depending on the density of the oil. Hydrostatic pressure difference is specific weight * depth. So if the weight of the oil is 55 lb/ft^3 (just pulling a number out of my arse here), then at 13500 ft, that would be 55 * 13500 = 742500 lb/ft^2, or 5200 psi. I'm not a physics major either but I happen to be taking a fluids class so this stuff is pretty fresh on my mind. :)
quote:
But whatever that pressure is that I was trying to put a number to, would in the JC opinion be too much to risk.
Yeah, that may well be. If the formation pressure is 11-12,000 psi, and the pressure drop to the surface is 5,000 psi, that leaves 6-7,000 psi at the BOP stack up. I'm sure the BOP below the rams can take that pressure because that's what it's designed for but the upper part is not and may not be able to handle it.
This post was edited on 6/28/10 at 10:21 am
Posted on 6/28/10 at 9:25 pm to Homesick Tiger
quote:
The BOP - that's the suppose to be fail safe piece of equipment in case of a blow out? We've all read that this is the first one to fail at this depth of drilling.
Is there any documentation of failures or near misses at this depth from other sights? If not, why the haste to shut them all down. It seems to me that a track record of near incidents would warrant the morotorium wanted by those screaming for it. However, a one time incident whether in reality or on record now does not establish a pattern. If a pattern has been established and overlooked by either the oil industry and/or the government then heads ought to roll.
The government lets people build on fault lines, in flood zones, etc. I don't see much continuity in their reasoning.
The BOP didn't fail the cement job did. The BOP is designed to shear drill pipe or casing but not both a once and for sure not a casing hanger.
If this was a normal kick the BOP would have handled it no problem they do it all the time. They would have built kill mud pumped it in and killed the well.
You are correct this is a once in a lifetime event. The subsea stacks have double redundancy and rarely fail!
Posted on 6/29/10 at 6:29 am to meauxjeaux2
quote:
What Oyster is saying to me is the BOP would have pretty much ruptured the well/seafloor if it had worked properly
you're talking about broaching -- where the casing would rupture beneath the seafloor due to internal pressure
it depends on how the well is flowing. if it is flowing up the 9 7/8" x 7" string that was recently run, then no, it would not have happened since that string is designed to see full production loads (i.e. high pressure).
if the well is flowing up the backside -- the annular space behind the 9 7/8" x 7" string, then it is possible, as those casing strings are not designed to see high pressure like those associated w/ being fully evacuated to oil/gas.
there are 3 rupture disks installed in the 16" string that are designed to fail before the casing itself fails.
This post was edited on 6/29/10 at 6:30 am
Posted on 6/29/10 at 10:40 am to meauxjeaux2
quote:
Evidently what people are saying is that there is no way to guarantee that if the BOP would have worked properly that this scenario would not have played out.
Scary proposition if you ask me.
This is my assessment as well. Another way of saying it is that due to:
1)the well design and
2)the nature of the failure (hydrocarbons up the backside)
we have a built a well that cannot be shut-in at the wellhead under these circumstances.
scary
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