METHOD OF ACTION ON COAL BED Russian patent published in 2014 - IPC E21F7/00 E21B43/26 

FIELD: mining.

SUBSTANCE: invention refers to mining, mostly to coal mining, and may be used for hydrodynamic action on coal bed and its deep degassing. Method of action on coal bed includes well bore construction in coal bed, its mouth casing, fluid injection into coal bed in static and pulse modes, well bore connection to degassing equipment and gas removal. Fluid injection into the coal bed in static mode is performed before and after hydrodynamic action on coal bed. Before hydrodynamic action fluid is injected up to pressure equal to gas pressure in bed, and after hydrodynamic action - under fluid pressure equal to coal bed hydraulic fracturing pressure.

EFFECT: improving efficiency of action on low-permeable coal bed and increasing volume of gas removal from it.

3 cl