Gas Displacement Engineering Test by Combination of Low and Medium Pressure Injection with Liquid CO₂ in High Gas and Low Permeability Coal Seam

Table 4

Table of medium pressure injection parameters.

Drilling name	Volume of injection (m^3)	Rate of flow (m^3/min)	Pressure rise rate (MPa/min)	Maximum pressure (MPa)	Dwell (time/min)	Depressurization rate (MPa/min)	Minimum pressure (MPa)
1#­1M	2.0	0.018–0.025	0.048	3.16	25	0.038	0.48
1#­2M	2.0	0.020–0.025	0.090	3.28	15	0.005	2.73
2#­1M	2.0	0.015–0.020	0.040	5.30	30	0.027	1.34
2#­2M	2.0	0.015–0.025	0.067	5.90	25	0.010	3.50