Patent ID: 11970945
Assignee: HANCHENG ZAOZHUANG INDUSTRIAL CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A hole protection system for coal seam slotting and fracturing combined drainage, comprising a hydraulic slotting subsystem, a hydraulic fracturing subsystem and a flexible hole protection system;
wherein the hydraulic slotting subsystem comprises an ultra-high pressure water jet generating module, a drill pipe drilling tool module, an orifice sealer, a gas slag separator and a drilling rig;
the water jet generating system comprises an emulsion pump station and a water tank; the drill pipe drilling tool module comprises a drill pipe, a drill bit and a high-pressure water braid; the whole drill pipe is a hollow circular pipe; the drill bit is provided with a radial nozzle and an axial nozzle for injecting high-pressure water; the radial nozzle is arranged at a front end of the drill bit; the axial nozzle is arranged on a side wall of the drill bit; the drill bit is installed at a head end of the drill pipe; an inner cavity of the drill bit is communicated with an inner cavity of the drill pipe; an input end of the high-pressure water braid is connected with the emulsion pump station through a high-pressure pipeline, and an output end is connected with a tail end of the drill pipe;
the orifice sealer has a tubular body; a front end of the orifice sealer is open and fixed on a hole wall of a borehole orifice, and a rear end is connected with the gas slag separator; the drill pipe extends into a borehole from the rear end of the orifice sealer; the gas slag separator is connected with a gas extraction pipeline;
the hydraulic fracturing system comprises an emulsion pump station, a water tank, a hole sealing device, a fracturing string and a casing; the water tank and the emulsion pump are connected by a high-pressure hose; the high-pressure water enters a water quantity regulating device through a high-pressure water pipe after the high-pressure water is generated; the high-pressure water pipe is provided with a flowmeter and the pressure gauge; a front section of the fracturing string is connected with a high-pressure pipeline adapter;
the flexible hole protection system comprises a front end fixing device, a water injection support pipe and a first flexible support; a pipe wall of the water injection support pipe is provided with a water injection hole; a head end of the water injection support pipe is connected and fixed with the front end fixing device, and a tail end is communicated with a hydraulic pump; the front end fixing device is provided with a supporting hook claw; the supporting hook claw adopts a compression spring structure; the water injection support pipe is arranged in the inner cavity of the drill pipe; the front end fixing device is arranged in a central hole channel of the drill bit; the supporting hook claw of the front end fixing device is clamped with an inner wall of the central hole channel;
the first flexible support is a net sleeve structure; the first flexible support comprises a plurality of annular support pipes arranged in sequence along a longitudinal direction; each annular support pipe comprises several unit waves, and the unit waves are arranged in sequence along a circumferential direction; two adjacent annular support pipes are distributed in mirror symmetry; two opposite wave peaks of the two adjacent annular support pipes are fixedly connected; inner cavities of the two adjacent annular support pipes are communicated; the inner cavities of the plurality of annular support pipes form a pipe net structure; and
the first flexible support in a contracted state is sleeved on a pipe body of the water injection support pipe under a non-working condition; and the water injection hole is communicated with a pipe net inner cavity of the first flexible support.