In another posting, Diogenese II asked a series of questions in the comment discussion that were not in context for that posting (Schlumberger BP), but which were good questions never-the-less.

Here’s the basic questions and answers given, which are sort of wasted in a regular comment thread which has gotten too long as it is.

Questions and Answers about the BP Deepwater Horizon Gulf Oil Spill

Q: What is a good source for ongoing quality information and actual real analysis?
A: Most of the questions you’ve asked or might have have been handled in the daily discussion threads over at theOilDrum.com. You can’t have looked for this information very hard or you would have easily found most of it.

Q: Where is the 60 minutes video report?
A: I linked to the CBS 60 minutes videos here.

Q: Where is the well, how deep, what is the pressure?
A: The ocean floor is a bit more than 5k feet down, the well is about 13k feet, for a total of 18k feet. Pressure on the ocean floor is about 2200 pounds per square inch. There’s debate about the pressure in the BOP, most people feel it’s about 8 or 9k psi due to some down hole obstructions. This is based on I believe what BP discovered during their ‘top kill’ attempt, where they realized that there was an obstruction down the hole somewhere that was further blocking the flows in that direction, which is why top kill failed. Most of the serious drilling guys thought top kill would fail, by the way. The top kill operation took the pressure in the BOP to about 10k psi, at which point they decided to stop because it became apparent that the damaged casing or pipe down hole could very well fail, creating a sub surface leak or blowout that would be impossible to handle at all. The first 1k or so of the well are going through Gulf mud, not rock. Ie, nothing solid to hold in the blowout if the casing fails.

[UPDATE June 9: please read the latest well pressure reports from the US government]
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In another comment thread (Schlumberger BP), Diogenes II asked a few questions, but the answer was too long for a comment, so I’m posting it here. Hopefully the questions will be clear from the answer, but if not, read the original questions from .

What follows is a more general overview and a background set of observations.

Questions and Answers about the BP Spill

Q: How to find a quick technological fix?
A: Resist the urge for fairy tale quick fixes, remember, no single entity is losing more money per day on this event than BP. BP has direct access to any and all resources of any company out there (remember, this spill event is negatively impacting ALL offshore drilling globally, and especially in the gulf). BP also made about 16 billion after tax profit last year if I read it right, so they can actually pay for this all more or less in cash. And they are paying. I have repeatedly seen drilling engineers say: wow, if I had gotten the design and implementation assignment for some of the stuff BP has done so far, it would have taken 4-6 months to complete, and they have gotten some parts done in weeks. I am not a fan of BP, they are clearly negligent if not actually criminally negligent in this process, but don’t confuse that with incompetence now, now the job is to fix this as soon as possible.

Q: what actually happened? Where is the rig located? What is the geology of the Gulf?
A: For an in-depth chronology of events, including background data, see What caused the Deepwater Horizon disaster?.

The rig is I think about 500 feet from the wellhead. The Ixtoc blowout, if I remember right, at 150 ft, was where the rig sank ontop of the wellhead/BOP unit.

Gulf geology is outside any area I can pretend competence at, google it, it’s complex, unstable, and varies widely depending on where you are drilling from shallow to deep to ultra deep.

Q: Why can’t we just dump microbes on the spill and have it magically get all cleaned up? Or: why can’t technology just fix this now?
A: The bacteria is what will eat the oil, the gulf is filled with bacteria, because the gulf seeps an unknown but very large quantity of petroleum products every year. The problem is that what is being spilled is in a concentrated area, and is all at once. Avoid mcgiver solutions, again. There has been quite a bit of discussion about microbial action, and one thing that has been pointed out is that, besides the fact that they work best at higher temperatures, they also consume oxygen in the water to catalyze the oil. So you’re talking about the potential of creating even larger dead zones than the gulf already was suffering from because of nitrate and other pollutants being tossed into the gulf from our agricultural heartlands via the Mississippi river and other rivers that dump their wastes into the gulf.
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Purely for the technically inclined, this was just updated. Shows the current revised pressure measurements at the Deepwater Horizon wellhead, inside the BOP unit, and at the exit point. Now you know too!

Taken from this theOilDrum.com thread.

Data source is the new: www.energy.gov/open/oilspilldata.htm page.

shelburn on June 8, 2010 – 7:08pm Permalink | Subthread | Parent | Parent subthread | Comments top

DATA – DATA – DATA
Love it!!

http://www.energy.gov/open/oilspilldata.htm

A major change from previous information. 4,400 psi at wellhead vs 8,000 to 9,000 psi previously thrown out casually at press briefings.

This actually makes more sense as it seems to indicate where BP might have gotten the estimated 20% increase in flow after cutting the riser off.

4,400 psi pressure at the wellhead, 2,560 psi at top of BOP, 2,250 psi static (past the riser kink.

1,840 psi pressure drop across BOP
310 psi drop across LMRP and kink, presumably mostly in the kink.
About a 17% difference. Obviously the calculation is much more complicated but 17% is pretty close to 20%.

Within the BOP:

730 psi drop at test rams
430 psi drop at lower pipe rams
620 psi drop at pipe rams and casing shear
60 psi drop at blind/shear rams

Someone who knows a lot more about BOPs might comment but it would indicate to me that most of the rams are at least partially operated or have some sort of obstruction.

This aliilaali guy is improving fast, so I wanted to share his opinions about what the flow rates probably are, and also shelburns (under the fold), and what they could max out as, as well as what he thinks the causes are. He puts this in a nice theoretical congressional investigation context, but it’s just his opinion. Ie, he’s using this as a writing device. That is, please don’t take this as actual testimony. I’m saying this clearly because sometimes people just don’t get humor and mistake it for fact.

But I think this is a fair overview from a guy who does this for a living in deep water, and almost, ideally, might help serve as a basic reality check for some of the wilder ideas that are probably starting to float around the internet right about now. Source is theOildrum.com BP Deepwater Oil Spill – The Oil in the Water, Seeps, and an Open Thread thread.

aliilaali on June 8, 2010 – 1:53pm Permalink | Subthread | Comments top

idle thoughts on flow rates…..seems like folks putting out numbers high as 200,000 BOPD …other are crunching 100,000 BOPD ……these are very high numbers and all I can say is IMHO we are not lucky like the Saudi’s…..these numbers are what we wish we could get form a well in the GOM… producers have been searching for wells that can put out such numbers for 30 odd yrs and it just hasn’t happened yet …if a BP engineer is called to testify under oath today to congress…..IMHO the conversation would be roughly similar to

Congress: do you beleive the rate is 5,000 BOPD
BP ENgg: i hope not….if its 5000 i’ll crack some balls in the geology and reservoir dept…and I wont be getting any yearly bonus drilling such wells this far out in the sea

Congress: do you believe its 20,000 BOPD
BP Engg: congressman you’re not as stupid as you look …and my bonus will come in good this year then

COngress: do you beleive its more than 30,000 BOPD
BP Engg: if you want me to sign something …i will need you to put 30,000 as the flow rate …that’ll cover my ass good and proper

Congress: do you believe its 40,000 BOPD
BP Engg: theoretically its possible…but I can only hope for such good luck in the Mississippi delta
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Oh, here’s another BP blowout, the Actania in 1993, off of Viet Nam. Just to help get across the point these blowouts aren’t really all that uncommon. Helps to have a perspective now and then I find.

Oh, also, don’t forget this one, Another Gulf oil spill: Well near Deepwater Horizon has leaked since at least April 30 (the Ocean Saratoga, picture under the fold…) … getting hard to keep up I have to say… here’s the 1993 video, it’s impressive, the first part is I think mostly natural gas.

Got this one from this comment, in a thread debating if Matt Simmons’ recent claim the actual BP blowout is actually 6 miles from the BOP location (nobody seems to think this is a valid idea, and many are wondering what is wrong with Matt, who is usually pretty solid…)

Toolpush on June 7, 2010 – 10:56pm Permalink | Subthread | Parent | Parent subthread | Comments top

Nate

The only way I can see for subsea blow out 6 or 7 miles away would be via a fault. BP drilling in Vietnam in 1993 with the Actinia semi sub hit such a fault.It was BPs first blow out for many years, looks like they are making up for lost time. From memory they were something like 10,000ft when they saw the sea erupting some distance from the rig. The blow out then came up under the rig around the casing. There is plenty of video on the net. With all the other problems BP had with this well and a fault like this, then they were just plumb out of luck. Possible but unlikely

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