Method for integrally sealing and separating gas extraction drilled hole in coal seam

A technology for drilling and coal seam gas drainage, which is applied in the direction of gas discharge, sealing/isolation, mining equipment, etc., and can solve the problem of low gas drainage concentration, poor sealing quality of gas drainage drilling holes, and inability to guarantee the drainage effect To achieve the effect of improving the concentration of gas drainage, good promotion value and easy operation

Inactive Publication Date: 2013-01-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, with the progress of gas extraction, the coal seam deforms, and the pores and fissures in the coal seam around the borehole gradually develop, forming gas leakage channels connected with the roadway wall, which greatly reduces the concentration of gas drainage
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Method used

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  • Method for integrally sealing and separating gas extraction drilled hole in coal seam

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Embodiment Construction

[0014] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0015] The coal seam gas drainage drilling and sealing integrated hole sealing method of the present invention: first construct a gas drainage drilling 1 from the drilling site to the pre-extraction area, such as the gas drainage drilling 1 depth 50m, aperture Φ113mm, after feeding the gas The gas drainage pipe 2 in the drainage borehole 1 is wrapped with 2-4 polyurethane sealing bags 5 at a distance of 15-20m from the orifice, and then wrapped with tape at a distance of 5-6m from the gas drainage pipe 2 from the orifice 2-4 polyurethane sealing bags 5, where the polyurethane sealing bag 5 should be no less than 5m away from the front end of the gas drainage pipe 2; at the same time, fix the slurry on the upper part of the gas drainage pipe 2 at a distance of 5~6m from the orifice Pipe 4, fixed grouting pipe 3 at the bottom, that is, gas extraction pipe 2, ...

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Abstract

The invention discloses a method for integrally sealing and separating a gas extraction drilled hole in a coal seam, and in particular is applied to sealing of a gas extraction drilled hole in the coal seam and gas extraction drilled holes in the adjacent coal seams. The method comprises the following steps of: forming a sealing space in the drilled hole by filling sealing materials; extracting high-concentration gas in an initial drilled hole by using an extraction pipeline; sealing the extraction drilled hole by using materials such as accelerated cement; and when the concentration of gas to be extracted is reduced to a relatively low level, spraying the surface of a laneway surrounding a drilling site by using sealing and separating materials, and forming a low-permeability separating layer serving as a connection channel for separating inner cracks and external air on the surface of the laneway so as to seal the extraction drilled hole. By the method, air leakage channel can be effectively sealed in the gas extraction process, and a phenomenon that air enters is avoided, so that the concentration of the gas in the extraction drilled hole is greatly increased, and the service life of the gas extraction drilled hole in the coal layer is prolonged.

Description

technical field [0001] The invention relates to a hole sealing method, in particular to a coal seam gas drainage borehole sealing integrated hole sealing method suitable for sealing a coal seam gas drainage borehole and an adjacent layer gas drainage borehole in a coal mine. Background technique [0002] Coal seam gas drainage is one of the most effective and direct methods to solve the problem of coal mine gas, and the sealing effect directly affects the gas drainage effect. At present, the most commonly used hole sealing methods are mechanical hole sealing device sealing and filling sealing material sealing (including cement mortar, yellow mud and polyurethane sealing). A sealed space is formed inside the borehole. However, with the progress of gas extraction, the coal seam deforms, and the coal seam pores and fissures around the borehole gradually develop, forming gas leakage channels connected with the roadway wall, resulting in a significant reduction in the gas extrac...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/03E21F7/00
Inventor 林柏泉高亚斌郝志勇翟成李子文成艳英
Owner CHINA UNIV OF MINING & TECH
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