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SUMMARY:Adsorption-induced stresses and variations of permeability in coal
  seams during CO2 storage or CH4 production - Dr Matthieu Vandamme\, Ecole
  des Ponts ParisTech
DTSTART:20171201T140000Z
DTEND:20171201T150000Z
UID:TALK93694@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:During injection of carbon dioxide in deep coal seams\, or dur
 ing production of methane from those same seams\, very significant variati
 ons of permeability are observed.\nCoal contains micropores (i.e.\, pores 
 with a diameter smaller than 2 nm)\, in which pore fluid is adsorbed\, i.e
 .\, in which most fluid molecules are in intermolecular interaction with t
 he atoms of the coal solid. Variations of permeability of the seam are a c
 onsequence of this adsorption in sub-nanometer pores: adsorption induces a
 n expansion of the coal matrix\, and hence a closure of the cleat system (
 i.e.\, a set of fractures naturally present in the coal bed)\, which in tu
 rn leads to a decrease of permeability of the seam.\nIn terms of modeling\
 , we present an extension of the poromechanical approach to microporous so
 lids and adsorption effects. One originality of the model is that\, rather
  than focusing on strains induced by adsorption\, we focus on the mechanic
 al stresses this adsorption induces. Experimentally\, we show on intact co
 al cores (i.e.\, in the lab) that adsorption can induce mechanical stresse
 s of several dozen MPa and variations of permeability of more than two ord
 ers of magnitude (as observed in the field)\, and that desorption can even
  lead to mechanical failure of the coal sample.\n
LOCATION:Oatley Seminar Room\, Department of Engineering
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