Underground low-permeability short-distance coal seam group hydraulic punching permeability improvement device and application method

Abstract

The invention discloses an underground low-permeability short-distance coal seam group hydraulic punching permeability improvement device and an application method thereof. The device comprises a drill rod, a punching drill bit, a directional drilling machine, a first high-pressure rubber hose, a high-pressure water injection pump, a second high-pressure rubber hose, a water tank and a water pipe,wherein the first high-pressure rubber hose and the second high-pressure rubber hose are arranged on a water outlet and a water inlet of the high-pressure water injection pump separately, the water tank is arranged on the second high-pressure rubber hose, the water pipe is arranged on the water tank, the directional drilling machine is arranged on the first high-pressure rubber hose, the drill rod is arranged on the directional drilling machine, the punching drill bit is arranged at the free end of the drill rod, and high-pressure water spraying holes are formed in the punching drill bit. Theinvention relates to the technical field of coal uncovering, in particular to the underground low-permeability short-distance coal seam group hydraulic punching permeability improvement device and the application method thereof. The device and the method have the advantage that the purposes of safely uncovering coal and shortening the coal uncovering construction period are achieved.

Description

technical field [0001] The invention relates to the field of coal mining technology, in particular to an underground low-permeability and short-distance coal seam group hydraulic punching anti-permeability device and a use method. Background technique [0002] In outburst mines, the risk of coal and gas outburst is high in soft, low-permeability and close-distance coal seam group Shimen, and the coal and gas outburst risk is high, and the drilling and drainage effect is poor, and the coal uncovering cycle is long. In order to ensure the safety of unearthing coal and shorten the time for unearthing coal, at present, my country's coal mines mainly adopt hydraulic punching, hydraulic fracturing, and deep hole pre-splitting blasting to increase permeability. When using hydraulic punching measures, first construct a borehole that passes through all coal seams. The hole diameter of the punching hole is small, and only a single coal seam is punched. Only the hole of the borehole is...

AI Technical Summary

Problems solved by technology

When using hydraulic punching measures, first construct a borehole that passes through all coal seams. The hole diameter of the punching hole is small, and only a single coal seam is punched. Only the hole of the borehole is connected to the external space, and only one channel is used to flush out the coal slag. When hydraulic fracturing measures are adopted, all coal seams in the coal seam group must be fractured, and there are uncertain and uneven fracturing effects on the coal seams of the fracturing target coal seam. Directional drilling is not used for construction, and the coal seam permeability enhancement effect along the direction of roadway excavation is poor. ; When using deep hole pre-splitting blasting measures, it is necessary to increase the amount of explosives, and the safety risk is too great

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