RE: Link21 May 2023 09:59
I had asked a question regarding the format of the flow testing, as to whether the flow testing would be individual sand reservoirs or concurrent testing of all reservoirs or sequential total testing by testing the lowest reservoirs first and adding shallower zones sequentially.
The answer by Pg was not particularly clear , but it seams to me they will flow test the deepest zone first and then add zones sequentially to reach their target for cng production.
The duration of testing was not fully answered either other than to say he was satisfied that the reservoirs were fully connected over 30km sq of the field.
Pg referenced the seven heads gas field in his answer.
So you might ask does this all matter.
If the focus is on getting to cashflow asap and using the cashflow to finance lots of follow on production wells it’s probably ok.
The flow testing in a cumulative sequential way has been common practice onshore USA for years, but is very crude method and makes calculation of reservoirs performances and characteristics difficult. It may not help to identify intra reservoir faulting and compartmentalisation problems until sustained production of a few months occurs . At seven heads there were thin sands below seismic resolution in a basin that had suffered inversion and the field was more compartmentalised than expected, requiring more wells to drain the field effectively , a major problem offshore but not such a problem onshore as well costs are so much lower. This risk may well be the reason for multiple production wells being planned by prd .
I had hoped that the flow testing of the tgb2 reservoir sands in mou 1 would have been long enough at such high pressures to prove gas down below the 1920 seismic twt depth , which would have effectively proved the gas in mou 3 in my opinion, but this does not look like it’s going to happen.
In addition, if flow testing is sequential the gas from tgb2 reservoir is expected to be very high pressure so it may well hold back lower pressure gas from other zones.
So you might think this is all very nice and academic so what, cash is king.
In my opinion , the quality of the flow testing impacts on the quality of the reserves and that in turn impacts the ability of the project to attract debt finance and the asset value if it’s to be sold or farmed out.
If the strategy is to get to production and use the cash to drill multiple production wells, and stay in production and not asset sale , it’s probably ok, otherwise other options will have a reduced value.
Jimmy