In-situ numerical testing of CO2 sequestration in coal: impact of residual water
Understanding the impact of in-situ residual water on the flow and transport of gas has important implications for enhanced coalbed methane recovery (ECBM) and CO* sequestration in coals as well as for related issues of gas outbursts during mining. Our previous study (Zhang etc., 2008) developed a new general porosity and permeability model that defined the porosity and permeability as a function of effective stress (instead of pore pressure in the current literature) and gas desorption-induced volumetric strain. This general porosity and permeability model was then implemented into a coupled gas flow and coal deformation finite element model under in-situ stress conditions. This study extended this model to include the impact of gas compressibility factors (Z), residual water (mainly the moisture effect) on the gas flow under in-situ stress conditions. The numerical results show that the residual water (mainly through moisture effect)may dramatically alter the balance between effective stress and coal swelling effects. This alteration regulates the evolution of coal porosity, permeability and pore pressure.
coal moisture swelling and shrinking permeability evolution modeling
D.Chen J.S.Liu J.G.Wang Z.J.Pan
School of Mechanical Engineering, The University of Western Australia, Perth, 6009, Australia CSIRO Petroleum Resource, Melbourne, 3169, Australia
国际会议
徐州
英文
669-676
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）