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

Table 1

Coal industry analysis and coal quality test results.

Coal sample	Industrial analysis (%)					Coal composition (%)			(%)
	Nonstick coal	3.73	35.53	6.92		51.21	2.46	54.36		43.55	20.8	0.63

is the moisture content of the coal; is the volatile matter of the coal; is the ash content of the coal; is the fixed carbon of the coal; is the hardness coefficient of the coal; is the vitrinite of the coal; is the inertia of the coal group; is the coal body’s external group; is the coal body’s maximum vitrinite reflectance.