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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

Inactive Publication Date: 2016-08-17
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that gas outburst accidents have always been prone to occur in bedding mining, so it is basically afraid to adopt bedding coal mining. It provides a method of hydraulic punching through bedding, which can be suitable for all coal seam structures and is applicable Strong performance, reduce the difficulty of mining, improve the efficiency of hydraulic punching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention discloses a bedding hydraulic punching method. On one side of a pre-mined coal wall, a variable-diameter drill is used to drill holes along the bedding to a deep layer to produce an external small borehole with a thickness of h1 and a diameter of d1 and a thickness of h2. An internal large borehole with a diameter of d2, where d1<d2; after exiting the reducing drill, insert a water injection pipe deep into the borehole, seal the hole and fill it with high-pressure water. The invention solves the problem that gas outburst accidents are easy to occur in bedding mining, and it is difficult to adopt bedding coal mining. The coal wall with a thickness of h1 is formed by using the variable diameter drill as a protective wall, which can prevent the coal seam inside the coal wall from being damaged Prominent accidents occur due to unbalanced forces to protect the safety of workers. It can also increase the water pressure strength, increase the internal pressure of the coal seam, have sufficient cracks, and achieve the permeability enhancement of replacement. Compared with the piercing hydraulic punching method, the present invention has the advantages of simple method, high efficiency, small workload and low cost.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a safe operation method for coal seam layer-by-bed hydraulic punching and wall breaking. Background technique [0002] The underground coal seam is in a long-term high pressure state, and the gas is sealed and compressed in different areas of the coal seam to form a stable structure. However, during the mining process, because the new mining area destroys the balance of the coal seam, the sealed gas will be released suddenly, causing outburst accidents. At present, in the process of coal seam mining, it is usually necessary to drill holes in the coal seam, and use hydraulic fracturing to increase permeability. Downhole fracturing significantly increases the air permeability of the coal seam. The purpose of hydraulic fracturing is to form micro-cracks and through-cracks in the coal body, so that coalbed methane can be quickly migrated out, and provide conditions for the next ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/18E21B43/26E21F7/00
Inventor 李辉李普王志军李超岳志奇王新伟肖云涛
Owner HENAN POLYTECHNIC UNIV
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