re: BOP help

quote:

---

Also WTF with the long string, run a liner tie that shite back.

---

Agree. Do we know for sure it wasn't a tie back though?

quote:

---

When yall say it shears pipe or casing, I assume yall mean it completely cuts through the pipe and or casing?

---

Yes

because they could i guess. the string weight probably wasn't too heavy to do it. there must not have been any salt encountered, so they didnt need a high cement top behind the string to give the pipe-cemented-in-pipe strength to resist salt creep/pinching.

like i said in a previous thread, i think a net reg change resulting f/ this will be an additional, mechanical barrier at least to isolate the formation behind pipe (like a liner/tieback or swellable elements).

to be fair to BP, there are a number of wells out there w/ a 10 3/4" x 9 7/8" long string (or something roughly equivalent to the well design) going from the wellhead down to the production reservoir, and something like this hasn't happened.

granted, most everyone else has a liner/tieback design, but it's also influenced by things like mitigating salt creep, hanger capacity/string weight, and annular pressure build up issues.

not trying to absolve anyone by any means, just offering that while this is kind of unusual it is not altogether unheard of.

The Bops are designed to cut through it all the casing too correct? So im still not seeing why the hot stab wouldnt have worked. Lose of hydraulic pressure? arent the shear rams hydraulic?

quote:

---

The Bops are designed to cut through it all the casing too correct? So im still not seeing why the hot stab wouldnt have worked. Lose of hydraulic pressure? arent the shear rams hydraulic?

---

yes, they should be able to cut drill pipe and most likely the casing involved here. however, cutting casing + drill pipe at the same time may have been too tall an order. we just don't know what was going on in the stack, so it's impossible to say.

also, shear rams are really designed to cut things that are under tension. when the cut is made, the string that is being severred is helping to pull itself apart to some degree. however, trying to cut a string that is under compression is a very different animal, and is very difficult to accomplish -- as stuff ends up piling up on the rams and the cut can be incomplete.

furthermore, trying to cut something that is is flowing as fast as this may be is a tall order as well. the flowrate can damage the rams and they may not seal.

i'm just trying to illustrate here that while the equipment has a simple name, blind shear ram, it's operation is a bit more complex.

quote:

---

BP is looking more and more culpable. I was assuming before that it was a liner which should have given indication of a well control situation early on. This changes everything. I can't see how TransOcean can be held accountable like BP is indicating.

---

It gets better. The abandonment cement job procedures WILL be one of the root causes of this failure.

quote:

---

It gets better. The abandonment cement job procedures WILL be one of the root causes of this failure.

---

And this is the root of all the issues that happened later right?