This study examines the impact of different CO2 injection methods on coalbed
methane recovery. Specifically, this study investigated the effectiveness of
continuously
injecting CO2 versus injecting CO2 that had been soaked for two weeks. The objective
was to ascertain which approach was more successful in enhancing CO2 Enhanced coalbed Methane (CO2-ECBM). The experiment involved injecting 3 MPa of
CH4 into dry coal samples, allowing it to adsorb until reaching
equilibrium, and then injecting 5 MPa of CO2 to recover adsorbed CH4. The continuous method recovered CH4 without detectable effluent concentration for 5
hours, but desorption efficiency was only 26% due to fast flow. On the other
hand, the desorption efficiency of the cyclic method was only 12%, indicating
trapped CH4.
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