RE: Possible timing for next RNS announcement18 Apr 2023 16:09
Billy,
You are basically correct - but the Hoya is the name of the whole formation and there can be more than one zone to test within the formation.
What they are looking for is production from fractures.
If you encounter a fracture while drilling at this sort of depth, while continuing drilling you'd expect the drilling fluid to enter the fracture and push whatever fluid (gas, oil or water - or a mixture of those) further back into the formation, away from the bore hole.
During normal drilling operations, there are things we can do to minimise this, but not in this instance (costs a lot of money!).
In addition, I suspect the drilling fluid that they are using is not being cleaned properly, so it's got a lot of solids in it (essentially drilled rock from further up the hole) which can also plug off the fracture.
Again, in a normal operation, there are things we can do during testing to clean that up (primarily using HCL acid), but not here - especially as they are open hole testing.
Both of these things make it more difficult to get the formation to flow and find out what fluid(s) is actually in the formation.
In that respect, to give it the best possible chance, they'll want to minimise the time between drilling any fracture and testing it - so as soon as they are confident they have a zone to test, they'll pull out the drill string, run the DST string and open it up to see what they can produce.
Once they've finished the test, they'll then have to 'kill' the Well prior to pulling the DST string and getting back to drilling and the 'kill' operation will tend to plug up that fracture, as they have to have a stable Well before they can start drilling again.
So they could well end up doing several tests just within the Hoya.