Abstract: Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.

Abstract: Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.

Abstract: Disclosed are an integrated mining method and an integrated mining system of coal breaking, coal extraction and water circulation in a U-well. The integrated mining system includes a first ground facility unit, a second ground facility unit, a jet unit and an extraction unit. The first ground facility unit is configured to transport jet fluid to the jet unit. The jet unit is configured to break a coal seam in a sub-segment to obtain broken cinders. The extraction unit is configured to extract a coal-water mixture. The second ground facility unit is configured to receive the coal-water mixture. In response to determining that an extraction of the sub-segment is complete, the jet unit and the extraction unit is configured to move to a next sub-segment using powers provided by the first ground facility unit and the second ground facility unit.

Abstract: A coal and coalbed methane mining system based on ground drilling includes: a drilling component, a coal mining drill bit and a ground facility group. The coal mining drill bit is set at a predetermined end of a directional borehole in a coal seam, connected to the drilling component through a connecting pipeline. The ground facility group is connected to the drilling component, to provide coal cutting slurry for the coal mining drill bit, receive reflux slurry carrying coal and coalbed methane, and precipitate and separate the reflux slurry carrying the coal and the coalbed methane. A coal and coalbed methane mining method based on ground drilling and related devices are also disclosed.