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Started By
Message
re: Assumption Parish sink hole environmental impact: Links in OP
Posted on 8/15/12 at 3:09 pm to DownshiftAndFloorIt
Posted on 8/15/12 at 3:09 pm to DownshiftAndFloorIt
quote:
You can't just stick a camera in there and look.
actually, you can.
1
Posted on 8/15/12 at 3:13 pm to Jester
quote:
They'll basically drop sonar down the bore
you can use down hole optics as well as infared.
infared looks just like a picture. If the problem is at the top of the hole as I suspect, then the IR tool will give you a good look at it. It should be placed in the original wellbore first.
eidt: a 40 arm caliper would be a good tool for trouble shooting.
This post was edited on 8/15/12 at 3:19 pm
Posted on 8/15/12 at 3:13 pm to hardhead
Well, yea you can. It's not like "oh look that bolt is missing" though. It takes much more than that to figure out what the problem is.
Posted on 8/15/12 at 3:18 pm to DownshiftAndFloorIt
quote:
It takes much more than that to figure out what the problem is.
probably not. This is a failure of casing probably, and all that looks like is a hole in the casing.
Most of these problems are caused by either failed casing or bad cement, (usually failed casing caused by over or under torquing, or not getting the proper placement of cement, which in this case could very well be that due to accelerated curing of the cement because of the salt at the bottom of the hole.
Posted on 8/15/12 at 3:22 pm to Jester
quote:
I don't know what they are all holding, but it's not out of the realm of possibility that some really nasty stuff has been hidden away in that dome.
That's my concern also. After seeing what was stored undocumented at some of the Superfund sites, I'm hoping there's nothing more than some low level NORM.
If it were to cause a failure of the adjacent dome it could get real ugly. I thought they had problems with another dome in the area a couple of years ago in that area.
Posted on 8/15/12 at 3:23 pm to hardhead
quote:
This is a failure of casing probably
Negative. The well was shut down because it didn't pass a MIT.
Posted on 8/15/12 at 3:30 pm to DownshiftAndFloorIt
quote:
DownshiftAndFloorIt
what is an MIT?
casing can fail if the well is not operated. most eventually do which is why they are filled with cement when thay are abandoned.
There is communication of fresh water and the salt dome somewhere. Where else could it come from? The surrounding caverns are in operation and a pressure change would have been noticed. All of my suspicions point to the well in this cavern failing.
Posted on 8/15/12 at 3:32 pm to hardhead
Mechanical integrity test
Deals with the walls of the well itself rather than casing at the well head
Deals with the walls of the well itself rather than casing at the well head
Posted on 8/15/12 at 3:37 pm to DownshiftAndFloorIt
quote:
Mechanical integrity test
Are you a PE?
Posted on 8/15/12 at 3:38 pm to hardhead
Nossir.
I just know a guy who knows a guy who knows a guy who knows what's going on.
I just know a guy who knows a guy who knows a guy who knows what's going on.
Posted on 8/15/12 at 3:57 pm to DownshiftAndFloorIt
sounds good
Posted on 8/15/12 at 4:13 pm to hardhead
quote:
It should be placed in the original wellbore first.
That's almost certainly sealed or they would be doing that already.
Posted on 8/15/12 at 4:14 pm to Capt ST
quote:
I thought they had problems with another dome in the area a couple of years ago in that area.
A lot of people had to be moved out of Grand Bayou some years ago because of something like that.
Posted on 8/15/12 at 4:21 pm to hardhead
quote:
Are you a PE?
I am and he's correct as far as I can tell. The actual well failed, that's what caused the sudden collapse. The issue with the surface is that you are stuck between a rock and a hard place. If you try to displace the brine with freshwater to try to save the surrounding swamps, you increase the risk of further dissolving parts of the dome that are exposed. Seems like a serious shite sandwich to me.
Posted on 8/15/12 at 4:25 pm to Jester
quote:
A lot of people had to be moved out of Grand Bayou some years ago because of something like that.
It was Xmas of 2003, there was another cavern that was leaking in the same dome. DNR says its not the same gas that's leaking presently, doesn't match the fingerprint.
I just looked at the map, the sinkhole is on the W face of the dome, about 500 yds from 4 storage caverns.
Posted on 8/15/12 at 4:36 pm to Jester
If the well hadn't failed an MIT the could push the brine out with fresh water without compromising the well too much, but you'd still end up with brine in the well...
Not much you can do really.
Not much you can do really.
Posted on 8/15/12 at 4:43 pm to DownshiftAndFloorIt
I guess the good news is they have been able to empty some of caverns.
This post was edited on 8/15/12 at 4:44 pm
Posted on 8/15/12 at 4:46 pm to DownshiftAndFloorIt
They need to try to isolate the dome from the surface water
Posted on 8/16/12 at 8:42 am to Jester
quote:
That's almost certainly sealed or they would be doing that already.
It could be very easily unsealed.
There is fresh water getting to the salt dome. A mechanical integrity test is a very broad term and could mean lots of things. It was probably just a pressure test. Depending on where the packer was set, (a packer is a removable plug)nobody knows where the failure occured.
So... If fresh water is getting into the salt, it is getting there how? Probably not through the impermiable strata (the rock layers), probably through a hole somebody drilled through the rock (the well). The well is just a hole in the ground drilled for use as a conduit to and from the salt dome. If water is getting to the salt it is likely getting there via the wellbore.
Posted on 8/16/12 at 9:11 am to hardhead
Giving the location of the sinkhole, my guess at this point is they got too close to the dome wall and caused it to fracture. Similar to what happened at Weeks Island. Would explain the tremors and the gas thats being released was trapped next to dome wall.
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