Coal petrography water-acid high-pressure presplitting, softening, impact prevention and permeability improvement complete equipment and method

Abstract

The invention discloses coal petrography water-acid high-pressure presplitting, softening, impact prevention and permeability improvement complete equipment and method. The complete equipment comprises a drilling system, a measuring and control system, a hole sealing system, and a water-acid coupling pressurizing system; the drilling system comprises an underground drill rig, a drill rod and a drill bit; the measuring and control system comprises a gamma ray logger and a drilling peeper for recording drilling position parameters, lithology and fracture development conditions and detecting a presplitting effect; the hole sealing system comprises a segmented fracturing hole sealer; and the water-acid coupling pressurizing system comprises a high-pressure water pump assembly, a gas booster pump assembly, a gas-water mixing pipe assembly and a porous parallel liquid supply pipe network. The complete equipment merges water injection and acid injection; a high-pressure carbon dioxide injecting pump is added; carbon dioxide gas is directly injected in a high-pressure gas and water mixing pipe; acid is injected after pumping, so that corrosion of a high-pressure water pump by acid is prevented, and high-pressure acid injection is implemented; the water pump is singly opened to implement hydraulic fracturing; the carbon dioxide injecting pump is singly opened to implement high-pressuregas splitting; and the two are opened at the same time to implement acid 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-cracking, softening, anti-scouring and anti-reflection enhancement. Background technique [0002] During coal mining, the coal body is often dense and hard, with poor air permeability, resulting in low cutting efficiency of the shearer, difficulty in releasing 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 mining of the working face, the goaf has a large suspended roof area, and a large amount of elastic energy of the rock mass accumulates, which is easy to form a large area of ​​roof pressure and rock burst. [0003] The traditional method is single water injection first, and then single acid injection. The pressure of acid injection is relatively small. The acid solut...

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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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