RE: New drill20 Aug 2021 02:50
I was hoping the " one " target tested would get a Drill Stem Test, but I'm not sure if that is the intention. I would have thought that the target would be the Red Sandstone Group, but it looks like it will be the Lake Bed Formation - in earlier RNS', they wrote:
[ Due to the poorly consolidated nature of the Lake Bed Formation encountered at Tai-1, it will not be possible to perform drill stem tests on any pay zones identified in the shallow strata in this well. This is to remove the risk of hole collapse during flow testing and ensure that Tai-1 can continue to test prospective closures at depth in the Red Sandstone and Karoo Formations. ]
The Red Sandstone Group had a strong show we were drilling through when the string broke.
[ At a depth of 552 metres, the Helium One mudlogging crew detected elevated helium in mud that constitutes a gas show. The gas show continued to increase over a thickness of 9 meters, at which point drilling was halted due to parted drill-pipe.]
We have no info about any shows other than the original 2.2% @ 70.5m - "The gas show is situated at the base of a 20 metres thick shale unit and persisted at >10,000ppm (>1%) He for 4-6 meters."
0-55m - wellhead casing
55-70m - Shale Unit (20m thick)
70-400m? - Lake Bed Formation - 1 show 70-75m @ 2.22% confirmed (400 is estimate of base of LBF)
400?-750m - Red Sandstone Group - 1 show at 552-561m+ (before drill string broke)
(2/3m shale seal but not sure if the show began straight away so does RSG start at 550m?)
750-880m - sealing unit for Karoo - 1 show tested 825-845m (fizz gas)
880-1121m - 4 Helium shows with a cumulative thickness of >70m (untested)
It may be that after testing the LBF, if the hole is still stable could they drill the RSG again? Possibly wishful thinking, but until informed otherwise, i'll keep wishing.
Good luck with the operation QS. Hope all goes well and you just need to rest up for a few days.