Pressure should not be an issue and is only relevant to the depth you're producing from. The 11 ppg mud used to control the shallower zone is probably a good 300 psi higher than the formation pressure. The fact that that sand was overpressured tells you it's isolated and therefore very unlikely to have any bearing on the pressure on the target sands (300m below it). The target sands are more extensive in the Northern Carnarvon Basin and are more likely to be in communication with regional aquifers (particularly a field the size of Artemis). Barring any slight depletion (and I mean slight), i'd imagine the pressure is circa 8 ppg (4500 psig) in target sands. 3000 psig @ 10200 ft is apprx 5.3 ppg, which would indicate the reservoir is depleted. Anything even approaching 11 ppg would indicate the sand package is likely to be isolated.
I am of course writing with very little information to hand, so don't read too much into the absolute numbers.
Hope this helps. Norton
MEO Price at posting:
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