METHOD OF INCREASING GAS PERMEABILITY FOR METHANE WELLS IN COAL SEAMS WITH THE USING OF BLOWOUT TECHNOLOGY BY EXPLOSION UNDER THE INFLUENCE OF ELECTRIC IMPULSES Russian patent published in 2019 - IPC E21B43/26 E21F7/00 

FIELD: gas industry.

SUBSTANCE: method of increasing gas permeability for methane wells of coal seams using blowout technology by explosion under the influence of electric impulses is applicable for operating wells of coal bed methane with low gas permeability. First, from the ground to the coal seam, a well bore of methane from coal seams with a positive electrode and a borehole of methane from coal seams with a negative electrode are built. Fixed platform installed with a positive electrode and a device for creating high-voltage pulses, using a drilling rig is placed downward to a predetermined area of increase in gas permeability of a coal seam in the methane well bore of coal seams with a positive electrode, and another fixed platform, installed with a negative electrode, with the help of a drilling rig is placed in a downward direction to a predetermined area of increasing the gas permeability of the coal seam in the methane well bore of coal seams with a negative electrode. Coal seam between the positive electrode and the negative electrode collapses at high voltage, and the extraction of methane from coal seams is carried out in the methane well bore of coal seams with a positive electrode and in the methane well bore of coal seams with a negative electrode. Large amount of energy generated by a high-voltage electric pulse directly affects the coal reservoir to form a plasma channel in the coal seam between the positive electrode and the negative electrode.

EFFECT: large amount of energy instantaneously passes through the plasma channel, and the force generated by high-temperature thermal expansion and shock waves act on the coal seam, so that the number of cracks in the coal seam is effectively increased and favorable conditions are created for the flow of methane from the coal seams.

4 cl, 2 dwg