Abstract:
Based on the principle that CO
2 adsorption capacity is greater than CH
4 adsorption capacity, CO
2 is injected and stored in deep coal seams, CO
2 replaces CH
4 to increase CBM production, having environmental and economical benefits. By using dual-porosity, two-phase model was established with the help of CBM reservoir simulation method, then the time of CO
2-injection with different pressures was studied. Injection pressure needs fracturing pressure lower than 10 MPa, and the injection rate is less than 47 L/min. Numerical simulation results are in good agreement with the experimental data given in this paper, show that the method is effective.