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 sweep efficiency and concentrations of produced gas against displaced volume at 2.2 MPa.</table>

The Scientific World Journal

Figure 11: Laboratory Study of the Displacement Coalbed CH<sub>4</sub> Process and Efficiency of CO<sub>2</sub> and N<sub>2</sub> Injection 