Laboratory Study of the Displacement Coalbed CH₄ Process and Efficiency of CO₂ and N₂ Injection

Table 2

Displacement experiment conditions and the results of different pressures of gas injection.

Number	Injectant gas	Injection pressure/MPa	Displaced volume	Sweep efficiency/%
Test 1	N2	1.5	0.4	93.8
Test 2	N2	1.8	0.5	95.26
Test 3	N2	2.2	0.3	97.11
Test 4	CO2	1.5	2.4	94.44
Test 5	CO2	1.8	2.2	97.14
Test 6	CO2	2.2	1.9	98.28