RE: Aquifier9 Jul 2020 11:32
The vertical well results have considerable data to show we have oil down to a depth way below the horizontal producing wells and due to the incredibly high productive index as a result of the high connectivity of the reservoir fracture system, even when producing 15,000bopd it should only, for example, lift water some 55.6 metres for from 7Z well - (based on a 7Z well PI of 190 stb/d/psi and from the fact water lifts 0.705metres per 1psi pressure drop ), and since the OWC / aquifer is some 265metres metres lower than the 7Z well, it looks to be a big safety margin. [And the 6 well has a similarly high PI (productivity index) of 205stb/d/psi - that's barrels per day, per 1 pound down hole pressure drop. These are apparently among the highest oil well Productivity Indexes in the world].
So, my thought is, we could have a ‘dead-end down' pocket of trapped (perched) water sitting close below the 7Z well – close enough for that pocket to undergo, in effect, localized conning. So, not from the aquafer, but from another nearby, much higher, water pocket. And that could be what we're seeing.
And, of course, as there is now a nicely cleaned up fissure connection between the heels of wells 6 and 7Z – when the 6 is producing ( especially when producing on its own) it can see the same water source(s) as the 7Z can - they’re just a bit further away than they are for the 7Z well, so water gets to the 6, but at a lower rate.
The FPSO's Produced water handling is shown as an impressive 20,000bpd, even so, it would obviously be really nice for us all if the perched water pockets showed signs of emptying some time pretty soon.
Just my thoughts, as always DYOR. Any other possible reservoir models out there?