Modelling of fully-coupled CO2 diffusion and adsorption-induced coal matrix swelling

Multiple CO2 diffusion mechanisms coexist in the coal matrix in certain pore pressure ranges and the subsequent CO2 adsorption induced-matrix swelling alters the hydro-mechanical properties of the seam. We investigate the CO2 diffusion/adsorption-induced swelling behaviour of the coal matrix, through a fully-coupled gas flow – adsorption – coal deformation model. Besides the constant diffusion coefficient-based approach, the multiple diffusion...