RE: Re. Massive oil column16 Apr 2020 21:26
Sailplane,
Yours was a 'technical' post which deserves a reply.
"This is a simplified, ball park estimation, not taking into account such things as fracture surface flow resistance, due to the fracture passageways not having smooth surfaces, nor to any tapering of fractures as they ascend to the well bore.
Anyone with genuine knowledge to improve on these thoughts/calculations?"
Firstly I'd like to repeat that I am NOT a reservoir engineer (though have some knowledge of that discipline), so cannot be considered an 'expert' in that sphere.
However, I feel that your overall 'look' at the thing is pretty much correct. But with a caveat. Specifically 'not taking into account such things as fracture surface flow resistance, due to the fracture passageways not having smooth surfaces, nor to any tapering of fractures as they ascend to the well bore'.
To my mind, such factors have to be 'taken into account'. Also, given the 'buried hill' nature of the Rona Ridge, it's almost taken as a given that the fracture 'width' is larger, the closer to the top of the structure one is.
7z is a weird beast. Yes, it does deeper, and I'm pretty sure that was a bit of a mistake, and it wasn't meant to be that way. It was the sidetrack off the 'pilot well Seven', and really ought to have been 'horizontal' like Six, but didn't turn out that way. Drilling / directional / lithological problems? I don't know. But nevertheless and despite the water-cut, it's a nice producer, thank you very much.
In fact, and in hindsight (20 / 20 as always) I bet the guys and gals at Hurricane are kicking themselves for having done the 7z horizontal sidetrack (at great expense) and not just stuck with the original Seven, plugging it back to a certain depth!
All interesting stuff, though, and part of the ongoing story.