Steve 73 post from LSE9 Jul 2020 07:16
At the current draw-downs there is no way the water can be coning from the aquifer - UNLESS the OWC is incorrect. I'd need to run detailed calcs to be sure, but my first pass guess is that it would need to be at least 100m higher than is currently assumed (15%). From the calcs I have made the BHP would have to be below bubble pt. before the aquifer could cone that much, and the ESPs would be inoperable below Bub Pt.
I'm not saying the OWC assumptions ARE wrong, but it does seem a massive error. You'd need to go back to the original well 4, 6, & 7 reports & CPRs to confirm.
Also, if the OWC was that much higher it makes a HUGE difference to the reservoir volume - and hence the probable volume of oil in place... (ie. area reduces by depth^2, and also shallower... so approx 50% less volume for a 15% shallower reservoir). I really can't see the CPR allowing THAT much of a mistake....