i ask cxy -len walker a long time ago about using ucg in a cbm...

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.