Laboratory Study of the Displacement Coalbed CH<sub>4</sub> Process and Efficiency of CO<sub>2</sub> and N<sub>2</sub> Injection

<table>The change of pore pressure during CO<sub>2</sub>-ECBM at 1.8 MPa.</table>

The Scientific World Journal

Figure 17: Laboratory Study of the Displacement Coalbed CH<sub>4</sub> Process and Efficiency of CO<sub>2</sub> and N<sub>2</sub> Injection 