Deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method

Abstract

The invention provides deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method, and relates to the technical field of coal mine gas extraction and dustfall. The equipment comprises a drilling control system, a high-pressure hydrodynamic system, a water pressure grading control system and a fracturing plugging control system, wherein the drilling control system adjusts the drilling direction of a hole-drilling drilling rod and the water supply pressure of the drilling rod, high-pressure hydrodynamic system provides high-pressure water with different pressure for the equipment, and the water pressure grading control system ensures that the drilling and drilling cutting washing water pressure is smaller than 5 MPa, the water pressure for a cutting seam in the direction perpendicular to the length of the drilling rod is 25-35 MPa, the sealing water pressure of a sealing capsule is 35-40 MPa, and the water pressure of further pressure reliefand anti-reflection of a coal seam is 40-50 MPa; and the fracturing plugging control system finishes hole sealing and hydraulic fracturing construction control. According to the method for constructing drilling holes, slitting in the holes, hole sealing and the hydraulic fracturing by utilizing the equipment, the integrated construction of the single equipment is realized, and the construction efficiency of gas drainage hole drilling and coal seam dust prevention is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage and coal seam dust reduction, in particular to a drilling-cut-sealing-pressure drilling equipment for deep low-permeability and high-gas coal seams, and using the equipment to realize drilling, slotting, sealing, and pressure drilling. The method of crack construction. Background technique [0002] At present, coal mining has shifted from shallow mining to deep mining. With the increase of mining depth, the ground stress of the coal seam also increases, resulting in extremely low permeability of the coal seam. Similarly, the gas pressure of the coal seam further increases, and the possibility of gas disasters occurs also increased. However, gas is also a clean and efficient energy source. Effective gas drainage in low-permeability coal seams to reduce the possibility of disasters and improve the utilization rate of gas is an inevitable problem in the scientific mining of deep coal ...

AI Technical Summary

Problems solved by technology

However, the main problems of the above-mentioned technology are: (1) the coal seam anti-permeability effect of a single drill hole is poor, and the efficiency of gas discharge is very low; complex

However, these processes all require pre-construction drillers, plugging drilling and hydraulic fracturing after withdrawing from the original drill pipe, and then performing gas drainage. The process is repetitive

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