METHOD OF DEGASIFICATION OF CONTIGUOUS COAL BED ON SITES OF PILLAR MINING ACTIVITIES Russian patent published in 2014 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method of degasification of the contiguous coal bed on the sites of pillar mining activities comprises conducting from the mine of wells up to crossing by them of the contiguous coal bed, sealing of wellheads from mine atmosphere, connection of wells to te degassing line, identification of caving step of main roof rocks and location of the zone of high methane emission into wells with reference to working face of longwall and extraction gases is offered. Besides, additionally the location of the starting zone of methane emission into wells is established, as well as the current position of borehole bottom after the next caving of the main roof rocks. And the current position of borehole bottom is established at the intersection of plains of discharge of roof rocks from immobile and mobile boundaries of the excavated space of the longwall.

EFFECT: improvement of safety of underground mining operations regarding gas-oil ratio due to more complete extraction of methane from the contiguous coal bed.