METHOD OF ELIMINATING BLOCKING AND INCREASING GAS PERMEABILITY FOR METHANE WELLS OF COAL BEDS UNDER ELECTRIC IMPULSE Russian patent published in 2019 - IPC E21B43/26 E21F7/00 

FIELD: mining.

SUBSTANCE: method of eliminating blocking and increasing gas permeability for wells of methane of coal beds under effect of electric pulses is applicable for highly efficient operation of wells of methane of coal beds. Method of eliminating blocking and increasing gas permeability includes: construction of coal bed methane of coal beds with positive electrode and well shaft of methane of coal beds with negative electrode from ground to coal bed; at gas yield drop when cracks in coal bed are gradually closed or blocked with granulated impurities during extraction of methane of coal beds after hydraulic fracturing, introducing a conductive ionic solution into a wellbore of methane of coal beds with a positive electrode for filling a coal bed between a wellbore of methane of coal beds with a positive electrode and a wellbore of methane of coal beds with a negative electrode with a conductive ion solution; placing the positive electrode and the negative electrode downward to the predetermined sections for increasing gas permeability of the coal bed in the methane well of the coal seams with the positive electrode and in the methane well of the coal beds with the negative electrode, respectively; and breaking under action of discharge of high-voltage electric pulses of coal bed filled with conducting plasma solution, between positive electrode and negative electrode, wherein shock waves generated from large amount of energy act on coal bed to induce repeated opening and propagation of closed cracks in coal bed and removal of cracks blocking granules so that number of cracks in coal bed increases and cracks connectivity improves.

EFFECT: technical result consists in improvement of efficiency of method.

5 cl, 1 dwg