METHOD FOR DEGASSING EXCAVATED COAL FIELD Russian patent published in 2023 - IPC E21F7/00 

FIELD: mining; coal industry.

SUBSTANCE: invention can be used in mines to reduce the intensity of methane emissions into the workings of an excavation site and increase the productivity of the working faces in terms of the gas factor. The method of degassing a coal mining field involves installing conveyor and ventilation drifts and an installation chamber in areas of the coal seam previously degassed by wells. Directional wells are drilled in the plane of the coal seam parallel to the axis of the excavation area. The annulus of the wells is sealed with pipes to prevent mine air leaks. The wells are connected to a degassing pipeline and methane is extracted. The location of the conveyor and ventilation drifts of the mined seam is established relative to the undermined seams in the excavated coal field. Additionally, from the intermediate drifts of the conveyor and ventilation workings of the existing excavation site, directional wells are drilled into the undermined coal seams. The wells intersect the roof rocks of the mined seam and then drill the well into the plane of the adjacent coal seam. Near the ventilation drift, two directional wells are drilled. The vacuum at the wells is set with the possibility of extracting methane-standard gas-air mixtures. The wells in the mining area, at the point where they are opened by the working face, are isolated from the mine atmosphere and a vacuum is created in them, exceeding the depression of the air flow in the bottomhole space of the working face. Conveyor and ventilation drifts are installed in multiples of the width of the coal pillar between the excavation areas. The junctions between the slopes are located according to the scheme of combining their joints with the conveyor and ventilation drifts.

EFFECT: increasing the efficiency of degassing the excavation field when mining a suite of gas-bearing coal seams by reducing the number of wells.

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