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Message
re: Links to live feeds from remotely operated vehicles (ROV)
Posted on 6/2/10 at 9:56 pm to SlackMaster
Posted on 6/2/10 at 9:56 pm to SlackMaster
quote:
If I'm not mistaken, the blade on this cutting device is more like a rope than a band saw. If this is the case, then the curvature caused by oil flow may not matter.
That makes sense too!
1
Posted on 6/2/10 at 10:09 pm to JudgeHolden
Maybe not.
1. drill pipe might lend support so that there is not long segments.
2. Leave the drill pipe alone and see if you can winch up the rise leaving the drill pipe or pulling it up.
3. Then cut the drill pipe with shears if you have to.
I realize those three options might not work.
But why not partially unbolt the flange put in some spacers then cut with the saw, then bolt it back.
1. drill pipe might lend support so that there is not long segments.
2. Leave the drill pipe alone and see if you can winch up the rise leaving the drill pipe or pulling it up.
3. Then cut the drill pipe with shears if you have to.
I realize those three options might not work.
But why not partially unbolt the flange put in some spacers then cut with the saw, then bolt it back.
Posted on 6/2/10 at 10:23 pm to omegaman66
The DWS's biggest problem is twofold the first being the weight or the riser closing the kerf and the second being the loose drill pipe inside the riser. as the wire passes and tries to cut the dp it moves causing wire breakage in addition to the binding issue that is why the saw is rotated if possible. This type of operation is done everyday in intervention both dive and ROV assisted for the downed platform segment. There is another low profile split frame cutter available to make the smooth cut on the riser followed by a DWS cut or split frame cut on the dp. Its called wedding caking the well and is very successful but not easy. Afterwards inflatable subsea valves can be installed to control the flow. The shear can also work but the valve will not be able to be installed but an open riser system can still capture most of the flow. These systems have been in existance since Hurrican Ivan and widely used post Katrine/Rita, but the major risk has always been the potential for increased flow rates if any other part of the operation fails
Posted on 6/2/10 at 10:26 pm to tigere
The diamond wire blade is a stainless cable that is thread through a series of diamond impregnated rings seperated by coiled tension springs to reduce impact stresses. The entire system is endless, a loop, that is then coated for protection.
Posted on 6/2/10 at 10:34 pm to ashy larry
quote:
Originally Posted by Orangetoes
The shears have just gone back in the water. We have to connect them to the subsea hydraulic power unit (SHPU) and then lower to the bottom. Once there, we'll have to reposition other boats and spin our heading around 180 degrees. We'll also have to move ROV's around. So, it will take some time before we get on the riser.
The diamond wire is off the table for now. The internal pressure and flow, combined with the strength of the riser and drill string inside it, is causing it to get stuck. Personally, I think we can make the cut after the shears are done - but, I don't get to make those calls.
The top hat that will be used can handle the jagged edge of the cut. I'd prefer to take the extra time to do it right - but, someone well above my pay grade has opted to get something done now.
Posted on 6/2/10 at 10:42 pm to omegaman66
wtf, that fool said on TV that he was certain this would work.
Posted on 6/2/10 at 10:45 pm to LEASTBAY
quote:
that fool said on TV
That covers a lot of people.
Posted on 6/2/10 at 10:58 pm to JudgeHolden
Shears are in the water. They will never be able to cut as low as the wire saw so that leak isn't going to be captured or is the flange itself going to be one of the points of the seal?
Posted on 6/2/10 at 11:08 pm to omegaman66
quote:
They will never be able to cut as low as the wire saw so that leak isn't going to be captured
good point, maybe they will upload a new graphic or video to their website
Posted on 6/2/10 at 11:16 pm to LEASTBAY
Whats up with link on BP? Is the LMRP plan trashed?
Posted on 6/2/10 at 11:20 pm to jennBN
LMRP is trashed, they are going to the looser fitting top hat
Posted on 6/2/10 at 11:21 pm to jennBN
More than likely the shears will cut the riser to reduce sprung weight so the DWS can be used to complete the cut. We do this on hurricane damaged intervention wells all the time it is sometimes a necessary step
Posted on 6/2/10 at 11:23 pm to tigere
CNN says different, they could be wrong though.
Posted on 6/2/10 at 11:26 pm to LEASTBAY
quote:
CNN says different, they could be wrong though.
I'd like to hear it from another source before I take it as gospel.
Posted on 6/2/10 at 11:26 pm to LEASTBAY
quote:
LMRP is trashed, they are going to the looser fitting top hat
Damn it. This means that it will be even less effective right? I would rather them slow down and try the diamond saw again than take a less effective option. This is frustrating to watch every effort fail...
Posted on 6/2/10 at 11:28 pm to jennBN
"The next move will be to use the sheer-cutting device that made Tuesday's successful cut on the riser. Because the rougher surface left by that cut will not accommodate the tight seal needed for installation of the lower-marine riser package, engineers will use the "top hat" instead, he said."
LINK
LINK
Posted on 6/2/10 at 11:34 pm to LEASTBAY
quote:
I would rather them slow down and try the diamond saw again
As would I. Going back to a known failure would not be an option with me.
Posted on 6/2/10 at 11:37 pm to redstick13
Top Hat has become a dirty word in my vocabulary. Sorry. Unless they've come up with some way to circulate through the device to prevent ice crystals from forming.
Posted on 6/2/10 at 11:42 pm to omegaman66
quote:
omegaman66
Good stuff, huh...
quote:
BigPapaVol: I would think the cleaner cut allows the better seal. All of you would be correct.
Orangetoes: I know the "source control" personnel aren't happy about it, either. So, either BP execs, MMS, USCG, or Obama Administration is making the decision to move quickly instead of taking the time to do it right. I know for a fact that Sec Salazar was in source yesterday listening to the "hive" - or maybe it was the day before since my days are running together a little bit. Here is a quick tidbit - the "hive" is a 24 hour conference call run by "source control." Every vessel working to stop the flow at the well (source) stays on that call all day. From the hive comes all directions to the ROV's, etc. There is also a super secret bat phone that rings next to the controller at the hive for offline conversations. Only the client reps have that number and we use it to ***** about ROV pilots, boat captains, and anything else that we don't want everyone else to hear... I've been calling that phone an awful lot today...
Posted on 6/2/10 at 11:44 pm to redstick13
I am not insulting the engineers working on this, but this just seems counterproductive. Are they going back to the top hat because of media and political pressure to do something quickly? Where is the attitude that Heyward had about it will take as long as necessary to do the job right? This public display is so painful to watch, you want to cheer them on and then they get wiped out again, it's like being a Braves fan.
did not see the above post before I posted mine...sorry
did not see the above post before I posted mine...sorry
This post was edited on 6/2/10 at 11:46 pm
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