METHOD FOR DEGASSING OF COAL BEDS Russian patent published in 2012 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method includes drilling of wells, casing of wells and cementing of the annular space, identification of at least one bed with low gas impermeability in a coal rock massif above at least one coal bed aimed for degassing, opening of coal beds and enclosing rocks, mechanical impact at coal beds, removal of working fluid, recovery of water along the entire thickness of the coal rock massif below the bed with low gas impermeability, production of gas along the entire thickness of the coal rock massif. Mechanical impact at coal beds is carried out with application of bed hydraulic rupture or gas-dynamic impact at the bed, or pneumatic hydrodynamic impact at the bed or hydraulic impact in cavitation mode. At least one bed with low gas impermeability is identified in the coal rock massif, arranged below the degassed coal bed, the coal rock massif is opened in the interval limited with the bed at the bottom having low water permeability and with the bed having low gas permeability at the top. Additional wells are drilled on the ways of gas migration and in areas of its accumulation.

EFFECT: invention provides for most complete extraction of gas contained both in coal beds and in enclosing water-saturated rocks.

6 cl, 6 dwg