Modelling of CO2-ECBM displacement from Jharia coalfield, India

Abstract

Summary The displacement of methane in ECBM recovery is a complex mechanism to understand. In this paper, an attempt has been made to fill the gap between experimental and modelling approach for the methane displacement calculations. An integrated approach has been followed to understand the methane displacement phenomenon. The competitive adsorption between CH4/CO2, diffusion and dispersion of gases through coal have been utilized for the methane displacement during enhanced coalbed methane recovery by CO2 sequestration. The competitive adsorption isotherm was drawn for the CH4/CO2 by taking 50%/50% gas mixture in gas phase. The diffusion coefficient has been derived during the adsorption experiment by studying the sorption kinetics of CH4 and CO2. The AD equation has been followed for studying the dispersion of gases through coal.