Displacement of different gases on the mechanism of methane and Its Experimental Research

摘要

The paper is research how to improve the exploitation of coal bed methane rate, we discussed the flooding in the coal bed methane gas, CO2 gas with N2 gas and the effect of displacement, respectively, and summed up: With the injection of different gases increase in gas,CO2 gas expansion into the coal seam caused by the increase of the maximum; permeability increase is the largest N2 gas, so we recommend that CBM should be appropriately rich in N2 gas injection to increase the permeability of coal bed methane. To further achieve this exploitation of coal bed methane, laid the foundation.