METHOD OF DEGASSING COAL BED Russian patent published in 2009 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method relates to mining particularly to coal mining and cn be used for working with a coal bed. The invention includes driving of a mine working, drilling of bed wells in the working area contour and down holes over the contours of prospective workings, sealing of wells/well, fluid injection into the bed through the holes over the limits of the bed discharge zone by stages, first in a static mode and then in a pulse mode, crack opening in the coal seam and connecting the wells/well to a degassing pipeline. Novelty of the invention is in the fact that a vibrowave generator is introduced into the well and in a static mode crack opening of black coal is performed at pressure of 3-5 MPa, anthracites - 5-8 MPa, after which the fluid is injected in a cyclic-pulse mode under pressure which provides penetration of the shock waves into interpore space and opening of macro- and micropores.

EFFECT: positive effect is achieved by intensifying underground degassing of the coal bed by providing penetration of the shock waves into interpore space and opening of macro- and micropores which will improve efficiency of removing methane from the bed, reduce gas content in the mine workings and reduce chances of explosions of gas and coal dust.

3 cl, 3 dwg