ANALYSIS OF COAL SEAM DEGASING EFFICIENCY USING BOREHOLES AND HYDRAULIC FRACTURING
The effect produced by hydraulic fracturing on the filtration resistance of coal seam zone subject to drainage by parallel boreholes is considered. The resistances to the gas inflow depending on the orientation of fractures, thickness of seam, and distance between the boreholes are analyzed. The efficiency of single and multistage hydraulic fracturing in forming multiple transverse and main longitudinal cracks is compared.