Determining the Starting Time of CO₂ Injection and Its Implications for the CO₂-ECBM Process.

For the CO 2 injection rate, there was a slight difference in its evolution law under different starting times of CO 2 injection, which showed a trend of rapid decline first, stable transition after, and a slight increase finally.

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The general evolution law of CO 2 injection to improve the recovery efficiency holds that with further development of mining time, the increase of cumulative CH 4 production and CO 2 injection should gradually slow down and show a decreasing trend, mainly because the total amount of CH 4 in the reservoir is fixed and the total amount of CO 2 stored in the reservoir is also fixed.

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