BP Will Go Ahead with Relief Wells ... But Admiral Allen Warns That There is a "Weak Link"

→ Washington’s
Blog

A day after saying that relief wells may not be needed, the government has decided that they are.

That's good news, as it greatly increases the odds that the oil well will permanently be capped.

Oil industry expert Robert Cavnar pointed out on July 14th - in arguing against the well integrity test - that there was a weak leak in the capping stack:

I'm sorry, but I have to ask, What
the hell are they doing? We now have an ability to capture all the oil
and stop this massive pollution of the Gulf (as well as measure it). We
have great weather to get the relief well completed. We already know,
without the "well integrity test", that they have severe damage to the
BOP and other surface equipment and casing. If that weren't true, the
damn thing wouldn't have blown out in the first place. We also know
that between the "capping stack" and the old BOP that there is a non-wellhead rated piece of equipment, known as the flex joint, along with the riser adapter, that we've talked about before. This piece of equipment, that normally sits above
the BOP, is not rated to nearly those pressures encountered by wellhead
equipment. All of the other components in this BOP are rated to at
least 10,000 psi (new, off the shelf, and undamaged); this piece is by
far the weakest link in the chain, especially since it took severe
stresses as the rig sank and 5,000 feet of riser torqued it as it sank.
Yesterday, Adm. Allen announced they were going to take the stack,
including this flex joint, to as high as 9,000 psi for up to 48 hours.
I have been unable to learn the model and rating of the flex joint
here, but Oil States advertises their LMRP flex joints to be rated
600-6,000 psi, far below the 9,000 to which Adm Allen said they would
potentially go; even with the 2,200 psi of hydrostatic pressure on the
outside of the competent caused by it being in 5,000 feet of water,
it's still at least 1,000 psi differential pressure over the rating of
the component.

Today, Admiral Thad Allen said
that the "spooling tool" was only rated to 7,500 psi, and that BP and
the government are worried about blowing out that part:

Here's the full transcript from Admiral Allen's press briefing.

As Cavnar explained on July (using BP's illustration and explanation):

Here's a good illustration of the entire assembly:

As you can see, the bottom spool of the assembly bolts up to the flex joint flange at the top of the BOP (blowout preventer).

Because
Cavnar and Allen name different - but adjoining - parts, I'm not sure whether it is
actually one part or both the flex joint and the transition spool which
are the weak leak.

But the bottom line is that BP has to be very careful when drilling the relief well.

And as I wrote on July 6th:

The team leader for BP’s relief wells – Boots and Coots – is 40 for 40 in successfully stopping oil spills using relief wells (around 6:10 into video).

Many oil drilling experts are hopeful that BP’s relief wells will succeed on the first try. I hope and pray that they do.

But the relief wells are not a slam dunk, especially at such extreme depths.

But the relief wells are not a slam dunk, especially at such extreme depths.

Comments

[WaterWings]

LOL

Copy and paste it.