RE: and another Monday 7am without a placing RNS27 Apr 2021 09:29
Sting,
You concluded from that partial quote from a post a success rate of 66% in a development, which is dire. AME had already established commercial flow (though E Sadak - 1 started production at about 60bopd and dropped rapidly to 30bopd) not just a short, curtailed test, because of water production as in Basur-1.
But I did recently have a look at COS (post on 21 April, replying to gkb47) which concluded 43%:-
'It's back to E Sadak for a comparison where the success rate after being put into production seems to be about 63% (7 out of 11), but that's after establishing a commercial flow.
UKOG have said about the same as Loxley and Arreton at about 65% - but I'd like to see the risking they've applied to get to that figure for those two first. Whilst companies have tried over the years to take the subjective element out of risking because it is opinion the best they can do is police it with risking committees or peer review - I don't suppose there's much of that in UKOG.
It also depends on the number of factors. I'll have a subjective go at four factors.
source presence - 100%, it's there - some risking might include migration path
migration path maybe 90% as they are drilling away from Basur-3 (but it won't be migrating from Iraq - a note for Wizard)
structure maybe 60% - includes top seal - structurally very complex area - if E Sadak can miss the reservoir 37% of the time then that has to be a problem, seal, not sure how much of an issue top seal is - obviously Basur-3 tested oil
Reservoir presence - 80% - again as it's expected to be naturally fractured carbonate to deliver oil there may be less or zones without fractures..
On a four factor risk that's 43% COS. Then there's commercial success - but as they might have to put the well into production regardless if it tests I'll leave it at 43%.'
Here's the remainder of the post you quoted:-
'They may be a simple bumps on the surface but subsurface they can be extremely complex, and the seismic data is usually poor - which is why there's a tendency to drill first - if nothing else to be able to correlate the seismic events or horizons (if there are any) to actual strata.
So it's not shooting fish in a barrel - probably why the well which was originally hoped for in late 2020 has slipped to mid 2021 as not only are the targets not necessarily easy to locate - there seem to be issues with the actual drilling.'