Research Development and Key Scientific and Technical Problems on CO2 Sequestration in Deep Coal Seams
Geological storage of CO2 is the most efficient means to achieve carbon neutrality by 2060,and CO2 sequestration in deep unrecoverable coal seam is a promising way of geological storage.The paper raises some scientific problems concerning CO2 sequestration and ECBM operations of deep coal seams,including CO2 adsorption on coal,the interaction between supercritical CO2(Sc-CO2)and coal,the solubility of mineral matters in aqueous Sc-CO2 solution,the thermodynamic parameters of CO2,the effect of CO2-coal interaction on fluid flow and so on.The determination techniques of CO2 adsorption,Equation of State,experimental conditions,and coal swelling,may result in unimodal,bimodal,negative isotherms and less reproducibility and repeatability of Sc-CO2 adsorption on coal.The change of CO2 density with temperature or pressure and the Joule-Thomson effect are the obstacles to the quantitative determination of CO2-coal interaction.The high Joule-Thompson coefficient of CO2 can cause the"Ice Plugs"engineering problem during CO2 injection.The swelling and plasticization of coal caused by Sc-CO2,the extracted small molecule compounds,and the dissolution of minerals in acidic carbonate water will affect the flow of fluid in deep coal seams,which will be limited by the free space in the seams.
deep coalbed methanecarbon neutralitysupercritical CO2enhanced recoverysequestration
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