Chinook Well Testing12 May 2021 10:04
Paul said in the last Q&A session - Chinook after well flow testing (on pump?) is currently shut in conducting a pressure build up test, after which it will be put back on flow testing (on pump?) for further testing.
They would not be doing a pressure build up test if they were not getting some kind of flow out of the reservoir.
It seems odd that they would continue to pump or flow test the well if they were not getting some reasonable amount of hydrocarbon out of the well. Suppose there could be some useful info from variable water pressures for the bigger puzzle given that you have the well, get as much info out as possible.
This is the uppermost zone being tested now, and not the zone further down that produced a lot of water and oil shows through a fracture or fault.
Gas vented during drilling could have been a very localized pocket in the formation. This happens all the time, I checked with a friend that works with drilling offshore to verify my thoughts about this. One would expect the local gas to have a similar pressure to surrounding formation, but it is not impossible to have a higher pressure local pocket that is sealed, just would take a unique set of geological circumstances to make it happen over time.
The “migration of gas” Paul refers to in Q&A is in my opinion the fact that gas has been present in this formation at this depth at some point in the past. This has either migrated upwards (updip) in the formation and been trapped (we have gas), or if not sealed, the gas could escape to surface. The oil shows mean there is oil present here as well.
Migration can also occur with a bad cement job allowing gas and fluids to move behind casing between distinct formation zones (requires differential pressure to move). This could be a reason water from lower zone damaged upper zone (swelling). It could also be why upper zone is producing water and oil shows like the lower zone. The upper test is fluids from lower zone, and upper zone is totally tight due to water swelling formation, water and oil flow is moving up behind casing to upper perforations. I’m not saying this is what happened, but that it could have happened.
So, going to be exciting to see what the answer is. We could very well have a decent gas and oil reservoir at Chinook, and with significant updips identified, there is a chance for some massive volumes. Will all depend on height where the oil water contact is. Will also be interesting how much of trap is oil.
TXP has penciled in two well pads at Chinook on the updip. Personally I believe this is more than wishful thinking from XM. They have other data besides the wells at Chinook.
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