Coal-rock water-acid high-pressure pre-cracking softening anti-scouring complete set of equipment and methods

Abstract

The invention discloses a complete set of equipment and method for coal rock water-acid high-pressure pre-cracking, softening, anti-scouring and anti-reflection enhancement, including a drilling system, a measurement and control system, a sealing system and a water-acid coupling pressurization system. The drilling system includes a tunnel drilling machine and a drill pipe. and drill bits. The measurement and control system includes gamma ray logging tools and borehole peepers to record drilling location parameters, lithology, fracture development and detect pre-fracture effects. The hole sealing system includes staged fracturing sealers, water‑ The acid coupling pressurization system includes a high-pressure water pump assembly, a gas booster pump assembly, a gas-water mixing pipe assembly, and a multi-hole parallel liquid supply pipe network; the invention combines water injection and acid injection, and adds a high-pressure carbon dioxide filling pump, Directly fill carbon dioxide gas into the high-pressure gas-water mixing pipe, inject acid after the pump, avoid acid liquid from corroding the high-pressure water pump, realize high-pressure acid injection, turn on the water pump alone, you can realize hydraulic fracturing, turn on the carbon dioxide filling pump alone to realize high-pressure gas Fracture, both are turned on at the same time to realize acid hydraulic fracturing.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a complete set of equipment and method for coal rock water-acid high pressure pre-splitting, softening, anti-scour and anti-penetration. Background technique [0002] During coal mining, it is often encountered that the coal body is dense and hard, and the gas permeability is poor, resulting in low cutting efficiency of the shearer, difficulty in discharging the top coal, difficulty in gas drainage in the coal seam, easy accumulation of gas, and gas accidents. Another situation is the hard roof above the coal body. After the working face is mined, the overhang area of ​​the goaf is large, and the elastic energy of the rock mass accumulates a lot, which is easy to form a large area of ​​the roof to press and impact ground pressure. [0003] The traditional method is to inject water first, and then inject acid. The acid injection pressure is small. The acid needs to be sto...

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Problems solved by technology

[0003] The traditional method is single water injection first, and then single acid injection. The pressure of acid injection is relatively small. The acid solution needs to be stored on the ground and stored in tanks, and then transported to the underground and injected by a low-pressure acid pump, so as to expand the cracks in the coal and rock mass and drive away the gas. , to achieve softening, but water and acid are injected separately, more equipment is required, the cost is higher, and the operation is more troublesome

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