[QUOTE=alcor;37223]That really depends on how much gas/oil entered the Annulus and how high up it has travelled. If we assume it’s still in solution then it shouldn’t migrate any further. This is why I emphasize the importance of catching the gain asap.
Believe it or not, it’s quite possible that no gas was in the Annulus, though I seriously doubt this. Let’s assume that 5 Bbls of gas has travelled half way up the Annulus in solution while displacing cement. This gas shouldn’t migrate.
The displacement gets under way and at some point the well goes underbalanced. Flow begins from the Annulus (if that is the failure). The displacement is stopped with SW at the BOP. SPP should read 1000 psi. It reads 1400 psi. The well should be shut in.
Let’s assume the well is now shut in with 15 to 20 Bbls of formation fluids in the Annulus. Will they still be in solution? We’d line up to the Choke and check for pressure. As long as the choke line is full of SW we’ll see the pressure rise quickly and we’ll see what the underbalance is in pressure equivalent. Our next action is based on what pressure is recorded. We should see a greater value on the Choke because the pipe is at 8300 ft.
Depending on the pressure seen on the guages the first objective would be to pump weighted mud down the string while maintaining the pressure on the choke. With mud in the BOP we would close the Choke and bullhead back into the formation if wellhead pressures allow.
In the case of the Annulus being full of gas, we’re going to get a leak at the WH anyway. I’ll get back to you after my dinner!!![/QUOTE]
I have a question, but just learnt Alcor’s been banned, pity I was just getting to like the guy, so this question is open to all. Where are you Alcor when i need you the most. Perhaps you will reincarnate yourself under another handle.
My question is about 1400 psi SPP reading after, as Alcor and reports stated SW was displaced from 8300 ft to the BOP.I read about this too in some report a couple of weeks or so ago and also heard it mentioned in one of those c-span interviews. If recall correctly the choke and kill gauges read zero - but then again I speculate that the choke manifold might have been lined up incorrectly, like perhaps a valves shut isolating pressure communication to the BOP stack.
I could be wrong, so please feel free to point this out, but if at the time this 1400 psi reading was taken and the choke/kill lines were primed with seawater @ 8.3 ppg with 14.3 ppg mud displaced by seawater to just above the BOP stack then could have this pressure been caused by the imbalance of choke/kill line contents of SW with riser mud contents ?
Hydrostatic of chokeline SW contents at BOP sideoutlet failsafe = 5000 x 0.052 x 8.6 = 2297 psi.
Riser Mud hydrostatic at BOP /mudline = 5000 x 14.3 x 0.052 = 3820 psi
3820 psi - 2297 psi = 1482 psi meaning that 1400 psi reading was due to imbalance between the chokeline contents vs riser mud contents and nothing mysterious about it.
Note I do not know what the air gap is but if we assume it be about 70 ft we get about 1500 psi. Any insights or corrections appreciate. My apologies if this has already been covered in this thread. I wish I had the time to read through every page of it.Thanks.