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Water conservancy punching hole making technology-beneficial mining drilling technology
Release time:
2019-12-02
Author:
Source:
Hydraulic punching refers to the method of using the water jet jetted by the drilling rig to flush out coal and methane in the outburst coal seam or induce controllable small outburst, so as to cause the coal body to relieve pressure, discharge methane and eliminate the danger of mining outburst.
Hydraulic punching refers to the method of using the water jet jetted by the drilling rig to flush out coal and methane in the outburst coal seam or induce controllable small outburst, so as to cause the coal body to relieve pressure, discharge methane and eliminate the danger of mining outburst. For coal seams with self-spraying ability, it is safe and reliable when it is used for coal uncovering at the stone gate, and it is suitable for soft self-spraying coal seams with serious outburst danger. The use of special hydraulic cutting or fracturing equipment, to achieve the internal water supply to the borehole in different directions of cutting or overall fracturing, so as to achieve the purpose of the coal hole fracture communication, improve the permeability of coal seam.
Application case: after adopting hydraulic punching hole making technology in coal seam 1208 working face of Shanxi coal industry company, the gas permeability coefficient of coal seam is effectively improved, the hole collapse problem in the construction process of gas drainage drilling in soft rock low permeability coal seam is solved, the gas drainage efficiency is improved, the drainage time of single hole is shortened, the safe and efficient mining of working face is ensured, and remarkable results are achieved.
Key words:
Process, coal seam, outburst, hydraulic, gas, permeability, drilling, improve, working face
