TSXV:ART.H - Post by User
Comment by
GreatSwamion Jul 14, 2011 10:17pm
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Post# 18833787
RE: RE: Questions?
RE: RE: Questions?In a way Pokerchamp - I guess the questions were (partially) answered. The comment about only expecting perhaps 1,000 bopd from the Shiranish speaks volumes in itself.
That low an expected flow rate simply means that the Shrianish here is very poor quality with no matrix porosity and probably a high marl comtent making it difficult to propagate a large open fracture system? Looking at the Miran logs I would have thought that there was a thicker clean brittle limestone here - one that would support a decent plumbing system.
Now that leaves me somewhat more puzzled about the running of the 7" casing string? Maybe it was just an engineering niceity - the need to run another casing string based simply on depth? It had always been my contention that having got the 9 5/8" casing string run that they would be quite safe to go quite a bit deeper - especially if they had no real useful plumbing opened up? That's why I felt quite certain that it was the encounter with "significant" plumbing that forced an early running of that 7" liner.
But from the answer you recieved - it seems nobody expected much out the Shiranish here and that makes the ending of drilling at the base of the Shiranish multiply inexplicable? Why the heck drill a multi million dollar hole in the ground - and spend a whole year and a bit doing it - if you have no means of getting down into a suitable reservoir? (Stopping in the Shiranish and then shooting holes in all your uphole casing strings before drilling and testing anything worth testing?)
I was hoping that some idea of fluid losses within the zones could be used as a proxy for permeability. Very slight to nil losses - even if heavily overbalanced = virtually nil permeability and hence poor to nil reservoir. Massive and troublesome fluid losses - with tonnes of Lost Circulation Material pumped away during drilling = really excellent reservoir permeability (and hence the lack of subsequent inflow on test means reservoir plugging - damage - and not poor reservoir per se).
Thanks very much for getting all the other questions answered. Seems like there was something of a buying spree subsequently - but against a generally falling market tide.
GS
To the poster who want's to ship me off to Kurdistan - there are many here would joyfully do that - but with a one way ticket and no passport I fear...