MOU-2 Logging & Testing questions.7 Jan 2023 02:06
The RNS of 30th December stated “A further update will be given, which is subject to partner approval, when MOU-2 reaches its intended pre-drill total depth of 1,500 metres TVD KB and prior to the commencement of wireline logging operations.”
Why just inform on TD? I suspect the answer relates to the MOU-1 RNS fiasco.
The MOU-1 initial RNS was widely misinterpreted, many today still apparently believe it was a duster. PG has explained in detail (particularly during the London presentation) the problems faced testing an unexpectedly overpressured borehole with poorly consolidated reservoir sands, washouts, and expanding clays. To get definitive readings, detailed specialist log interpretation by Nutech was required, and that may not be available until some time after finishing MOU-2.
I assume that MOU-1 was not logged while drilling, but a wireline was run after completion of each stage. The first 100m was drilled at 13 3/8”, down to 800m was 9 5/8”, then down to 1500m TD at 4½'. Some logs (eg resistivity, SP) can only be done in an open hole, others can be done after casing. Given the poor hole conditions, I would expect them to case each stage as soon as possible.
Given that we should anticipate similar issues with MOU-2, I assume that they will log the 2nd stage (looking for biogenic gas), then case, drill down through the primary target reservoir (thermogenic gas), then log again and finish casing, with completion ready for rigless testing. So by the time the next RNS is issued, some (all?) wireline logging will already have been completed, but it's just they are not prepared to issue unverified data. Do others agree that this is the likely scenario?
Next, I have some questions related to testing. There has been some discussion on simultaneous testing of MOU-1 & -2 to determine connectivity of the reservoir. I am familiar with these procedures, but have never heard of it being done with two boreholes so far apart (8km). Does anyone with specialist knowledge of this sort of testing know if this is likely to work?
Classicly, flow testing would be run over 30, 60 & 90 days. If the reservoir is as large and overpressured as we hope, is there anything to be gained by long term flow tests? The volume of gas flowed during the testing period will be such a small proportion of the whole that any pressure decline would be minimal. Again, for those with specialist knowledge, what sort of flow testing parameters would a partner or finance lender require before entering into an agreement?
I guess I am questioning how long it will take for sufficiently detailed and accurate logs and tests to be available before PRD, and most importantly ONHYM, are prepared to release them? I really don't see this being this month, as it seems some here are expecting. Would it be one RNS containing the whole data bundle? PG is acutely aware that any news release for MOU-2 does not cause the confusion that arose after MOU-1. Thoughts, p