RE: Production Enhancement Option25 Aug 2020 23:18
Hi SpruceGoose2,
Yes, agree that water injection is a candidate for future shallower-drilled wells. But I think deeper drilled wells with gas injection may be more derisked following the "new model" where the board has taken into consideration of a shallower OWC. With shallower drilled wells.. there's still the risk of OGC (oil/gas contact), which for the current Lancaster wells I don't believe we know anything about...?
"What is the connectivity at different levels, and would gas injection readily permeate the wider reservoir (if indeed there is one, and here i'm thinking Rona Ridge to Halifax), in which case a shipload* might need to be shoved in the cap"
Yes, we don't know the connectivity of the wells at different levels. But what can be managed is the pressure drop within the well. The pressure drop created by the 6 and 7z oil extraction can be offset by compressed gas injection. Thereby, maintaining the BHP and preventing other fractures (including the aquifer) from flowing in due to the pressure differential drive. This is probably easier said than done.
"Imho the most likely outcome of the reservoir situation is that the owc may be very variable"
I don't know what the technical model includes, and who knows, it may still be perched water. I prefer preparing for worst case scenario then finding out it's better than predicted.
And at the worse case scenario, the gas cap is connected via the aquifer - and so you have the aquifer displacing the oil in the well as the pressure is equalised throughout the connected fractures.
So in this case, the OWC will be variable and continue to rise up the depths of the well as oil is extracted.
"So Dr Trice, imo, may well be right, there. (I guess it depends where the temp's are being measured....) Or wrong."
Yes, agreed that there probably is insufficient time for heat transfer to take place until equilibrium. But we're also talking 2000 m3d-1 (Isn't this 4000..?) flow into a supposedly c. 4,500,000 m3 reservoir (at 1P reserves).
But who knows - as you say we don't know where T is measured, or if the 7z well ESP even pulls in directly from the aquifer fissure..
ALL just my understanding and opinion.
Slift.