METHOD FOR DETERMINING METHANE BED PRESSURE AND SORPTION PARAMETERS OF COAL BED

摘要

FIELD: mining engineering.;SUBSTANCE: method includes drilling a bed well, sealing its collar, measuring the pressure and production rate of methane during the closure and opening stages of the well, verifying sorption parameters in the theoretical model of methane mass transfer with pressure and methane measurement data. After steady production rate of methane is reached, water is injected into the well at a pressure of 10…15 MPa, the well collar is closed during water and methane pressure stabilization period, then after the outflow of water from the well the current methane production rate is measured. The value of the steady water pressure is determined by the upper limit of the methane bed pressure, and according to the measurements of the methane production rate before and after the hydroprocessing, the sorption parameters of the coal bed in initial and wet conditions are verified.;EFFECT: increased reliability and efficiency when determining methane bed pressure and sorption parameters of coal bed in initial and wet conditions.;2 cl, 3 dwg, 4 tbl