An experimental procedure for determining the effectiveness of CO2 injection into methane-containing coal samples for the purpose of enhancing methane production is described. Experimental results on both dry and water saturated samples reveal that CO2 injection greatly enhances both production rate and recovery efficiency. Most effective is a cyclic CO2 injection-gas production technique which recovered essentially all of the adsorbed methane in the 3½″ core samples used in the experiments.

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