Abstract
Abstract This paper presents experimental investigations on CO 2 /CH 4 binary gas flow in bulk coal under controllable stress conditions, focusing on sorption-induced swelling/shrinkage and gas permeability associated with CO 2 -sequestration enhanced coalbed methane (CO 2 -ECBM) recovery. The gas flush tests with carbon dioxide were conducted on a specially designed true tri-axial stress coal permeameter (TTSCP) using a large coal sample pre-adsorbed methane. These tests simulate the in-situ conditions of CO 2 -ECBM recovery from coal and provided experimental information for better understanding of the gas transport in coals. The swelling/shrinkage coefficients of coal associated with CO 2 -ECBM process have been evaluated using the experimental data. The results show that adsorption and desorption of gases CH 4 and CO 2 can significantly affect the volumetric change of micro- and macropores in coal, leading to coal swelling/shrinkage and fluctuation of permeability, and hence controlling the transport and flow of gases through coal.
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