RE: Ignore Swampys on this BB6 Aug 2018 10:50
I sent the swampies presentation to someone I know in the industry and he knows his stuff this was his reply.
what a load of guff, the injection well at Brockham may be called an injection well but that REALLY is not a good name,, it is more akin to a water disposal well. Why ? because there is insufficient reservoir pressure to produce naturally to surface (the oil produced is under artificial lift) that means the fluids in the well can not reach surface naturally, So the water injection well (which was a past producer) is now used to dispose of the water that is produced with the oil in the other wells, and that water goes back into the reservoir. When you pump the water to the injection well from the storage tanks on surface, the well actually wants to take the water, it is not INJECTED as the name implies,, simply, you suck out a barrel of oil, then the reservoir can take a barrel of water (Simplified but not exact), I do agree that intense production from large and usually shallow fields/reservoirs can potentially induce ground dips, something easily first identified in some early Texas wells and is a known. Does it really apply that much to the kimmeridge and even the Portland ? OK this is JUST my industry professional opinion... IF the oil being recovered is "actually" from a true formation and that formation is only giving oil from the fractures within it, meaning the actual rock type contains little oil and virtually all oil recovered is from the natural fracture spaces then it is unlikely to have any natural depression effect or cause seismic issues, along with low reservoir pressure and no huge pressure drop on the formation at depth. Any future water disposal well would be doing the same as Brockham and the reservoir will take the water, it will not need to be pumped into the formation. Fracking "could" have the potential to induce minor seismic activity, but in my honest opinion, unless you were extremely close to a stressed fault then it is unlikely, mainly because Fracking is actually very localized, it does not extend massively from the wellbore and you would be pretty unlucky to cause such an event. That said, they might be able to actually record the initial shock, same as firing a decent amount of perforating guns. If you were monitoring within the area then you might detect the short shock wave at the point of activation, but it is small and lasts just a few milliseconds. other than that most of what i see on that video is poor understanding and dramatization
Now I am hoping that the committee are a group of intelligent people who will take on board the facts, proven facts,
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