i ask cxy -len walker a long time ago about using ucg in a cbm lease ,
What seems a simple suggestion is rather more complex. > > > > 1. CBM extraction is usually in much deeper coal seams, say 500m plus. > > While UCG is still applicable the costs will be higher and initial focus > is > > on 100 to 300m depths. > > 2. CBM recovers only 5% of the total energy in the coal seam (the gas) > while
> > UCG gets most of the coal plus any gas as well, say 80+% of the total > energy > > in the seam. It is much more efficient to do UCG from the start. > > 3. CBM drill holes are at wide spacings and, unless all wells are > carefully > > grouted up after use (??), will leave permeable flow paths in the coal > seam > > which may cause UCG gas to be diverted past the recovery wells. Ie CBM > > activity may in fact undermine the use of UCG in the seam rather than help > > it.
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