RE: Tech Stuff,17 Jun 2020 23:38
Malrees,
"adoubleuk,
I think you know more about actually drilling wells and getting them working than any of the current contributors on here."
Thank you for the compliment, but there are one or two others who 'know their stuff' here, but tend to hide their lights under a bushel.
" I am very interested in your thoughts on what the plan might have to be to re-work 7-Z, particularly how long we have to suffer production reductions and what the actual risks are that the re-work would fail to improve matters at all."
OK, that's two questions. To which I have no exact answers at all. But I very strongly suspect that any workover (or rather complete re-working of 7z, because it wouldn't be a 'simple workover') might very well involve shutting down production from 6 for the duration. Ie, loss of production, and thus revenue. Yes, there might be 'windows' of maybe ten days here or there when 6 might be 'run', but that's stop-start, never a good thing, and very likely not cost-effective.
The two wellheads are adjacent. So anything like rig move-in and attachment to 7z would require 6 to be shut in. Likewise, downhole, the wells are (despite 670m distant) in 'instant' contact. So workover operations on 7z will have an effect (possibly negative) on 6, so best to remain shut in during that time as well.
But I can't quantify this. Nor can I really give an opinion as to whether such a remedial operation would work or not. But my seat-of-the pants feeling is that it might be something of a coin-flip. 'Suck and see'. Not very scientific.
"We have very little leeway to play with here."
Yes.
Because given the sums involved, plus probably production downtime, a new well would almost certainly cost no more, and probably wouldn't require loss of production and thus revenue.
This is why I'm very very wary about buying back in. Because the new BoD might (and by inference are) be adopting a 'to hell or bust' attitude. And really (reading their CV's) with not much to lose. Because if they break the thing, the oil remains there, for someone big to snap up for peanuts later.
" I've been invested in several companies where re-workings occurred, but none of them in fractured basement."
Yes. Some companies have drilled an exploratory well, it's been a duster, done a sidetrack, and bingo ! Not an uncommon story. But this is different. Doing a 'workover' on 7z as it is (And it would be a huge major workover) would be expensive enough, and complicated, with no guaranteed success. The idea of a 'sidetrack' of 7 makes even less sense. Think of it like a car-racing team. You've got one car which is a winner, another which shows problems. What do you do? Keep running with the winner, keeping the other in reserve, while meanwhile building a third, which may or may not bring the entire thing to victory? Or shut down the entire show for a season?
This has got Shell's fingerprints all over it.