Bedding hydraulic punching method
A technology of hydraulic punching and layering, which is applied in earth-moving drilling, gas discharge, and mining fluids, etc., can solve the problems of gas outburst accidents, dare not to adopt coal mining in layers, etc., so as to improve the water pressure intensity and reduce the difficulty of mining. and mining costs, and the effect of promoting and implementing
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Embodiment 1
[0011] Embodiment 1: A kind of bedding hydraulic punching method, (1) on one side of the pre-mined coal wall, use a variable-diameter drill to drill along the bedding (the area where the coal seam is located) to the deep layer, resulting in a thickness of 20m and a diameter of 70mm external small borehole, and at the same time produce an internal large borehole with a thickness of 60m and a diameter of 150mm, thus forming a layer of coal wall with a thickness of 20m; (2) After exiting the variable diameter drill, insert a water injection pipe into the depth of the borehole The hole is sealed, and the water outlet is located in the coal seam inside the coal wall; (3) Filling high-pressure water into the depth of the coal seam to form micro-cracks and through-cracks in the coal seam.
Embodiment 2
[0012] Embodiment 2: Another bed-by-bed hydraulic punching method. On the basis of Embodiment 1, a gas drainage pipe is inserted between step (1) and step (2) to drain the gas in the coal seam.
Embodiment 3
[0013] Embodiment 3: A vertical shaft communicating with the coal seam is provided in the first mining area in Embodiment 1, and drilling along the bedding is started for the first time in the vertical shaft.
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