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Method for sealing closed gas drainage hole in soft coal bed areas

A technology for gas drainage and soft coal seam, which is applied in the directions of sealing/isolation, earthwork drilling, wellbore/well components, etc. It can solve the problems of gas leakage in the drilling area of ​​gas drainage in soft coal seams, and achieve the goal of eliminating coal wall leakage Gas problem, reasonable design, high expansion ratio effect

Active Publication Date: 2013-08-14
JINCHENG MINGSHI COAL LAYER USING
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of serious air leakage in the gas drainage borehole area of ​​the soft coal seam, the present invention provides a sealing method for the gas drainage borehole area of ​​the soft coal seam

Method used

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Embodiment Construction

[0012] Specific embodiments of the present invention will be described in detail below.

[0013] A hole sealing method for a closed gas drainage borehole in a soft coal seam area, comprising the following steps:

[0014] (1) Traditional hole sealing of gas drainage drilling: sealing the gas drainage drilling on the side of the roadway; the details are as follows:

[0015] a. Connect four Ф50PE sealing pipes, and tie two bags of special synthetic resin for coal mines (500 grams per bag, divided into two parts, A and B, hereinafter referred to as "A-B bags") to the hole of the sealing pipe with plastic tape The mouth is about 12m (without opening the partition);

[0016] b. Take out the spacer in the middle of the "A-B bag", rub it with your hands for 3 minutes, so that the A and B liquids in the bag are fully mixed;

[0017] c. Insert it into the drill hole by rotating the sealing tube, and the orifice is exposed about 300mm, so that the package will be worn out by friction w...

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Abstract

The invention relates to the technical field of mine ventilation and safety-type coal bed gas drainage, particularly to a method for sealing soft coal bed gas drainage hole areas, and solves the problem of severe air leakage of soft coal bed gas drainage hole areas. The method comprises the steps of (1), sealing gas drainage holes on a roadway lane; (2), evenly distributing 2-4 closed short holes which are 6-8m in depth within a range with the circle center of each gas drainage hole serving as the center and the radius of 1-1.5m; (3), filling each closed short hole with low-consistence high-expansion cement which permeates into coal bed fracture areas until cement paste seeps from a coal wall; (4), standing for 20-24h for solidification of cement paste to form a fracture-free wall composed of coal bodies and cement. According to the method, the design is reasonable, the hole sealing technology is improved, the defects of existing hole sealing technologies are overcome, and the problem of air leakage of coal walls is solved thoroughly.

Description

technical field [0001] The invention relates to the professional technical field of mine ventilation and safety coal seam gas drainage, in particular to a hole sealing method for closed gas drainage boreholes in soft coal seam areas. Background technique [0002] At present, many high-gas mines are facing the problem of poor sealing effect in the soft coal seam area. The main reasons are: 1) During the roadway excavation process in the soft coal seam area, the coal mass of the roadside is formed sequentially from the roadside to the inside due to the influence of the tunneling and mining Pressure relief zone, stress concentration zone and original stress zone, pressure relief zone, and coal body cracks in the original stress zone increase; 2) The ground stress in the soft coal seam area is large, the coal seam is broken, and too much coal is pulled out during the gas drainage drilling construction process. The cracks in the coal seam are increased again; due to the increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 张文青王永革田书龙张育恒辛宪耀董炳文曹雪芹李海涛成国清
Owner JINCHENG MINGSHI COAL LAYER USING
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