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Coal seam spraying reinforcing and grading grouting cooperative hole sealing method

A coal seam and hole sealing technology, which is applied in earthwork drilling, sealing/isolation, wellbore lining, etc., can solve the problems of inconspicuous gas drainage effect and poor sealing effect, so as to improve the effect, concentration and cost of gas extraction Low, high safety effect

Active Publication Date: 2020-01-24
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the traditional grouting sealing method is mostly one-time grouting, the sealing effect is poor, and the effect of improving gas drainage is not obvious

Method used

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  • Coal seam spraying reinforcing and grading grouting cooperative hole sealing method

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Embodiment Construction

[0024] The specific embodiments of the present invention will be briefly described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those skilled in the art without creative work Examples, all belong to the protection scope of the present invention.

[0025] figure 1 A preferred embodiment of the present invention is shown and analyzed in detail.

[0026] Such as figure 1 A coal seam spray reinforcement and graded grouting collaborative sealing method shown includes the following steps:

[0027] Step 1. After the coal seam roadway is excavated, a fissure zone is formed on the roadway wall and its surroundings. Spray the slurry on the roadway wall to reinforce the roadway wall and form an isolation barrier 8 to initially seal the mining cracks on the roadway wall and isol...

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Abstract

The invention discloses a coal seam spraying reinforcing and grading grouting cooperative hole sealing method, and relates to the technical field of coal seam cooperative hole sealing methods. The hole sealing method comprises the following steps that firstly, spraying reinforcing is carried out on the wall surface; then a bedding extraction drilling hole is constructed, and grouting hole sealingis carried out; and finally a colloid under pressure is injected into a colloid injecting drilling hole on the two sides of the extraction drilling hole by a colloid injecting pipe to block a fractureregion; and when the gas concentration is gradually reduced to a certain value along with extraction, the colloid is injected into the colloid injecting drilling hole again by the colloid injecting pipe to block secondary fractures. According to the coal seam spraying reinforcing and grading grouting cooperative hole sealing method, drilling and blocking are achieved through the mode of wall spraying reinforcing in combination with drilling grouting, the operation is simple, the cost is low, the safety is high, and the effect is good; meanwhile, the two-stage grouting mode is adopted, the secondary fractures generated by the coal matrix shrinkage are caused due to desorption flow of coal seam gas, good blocking is carried out, and the extraction effect and the extraction concentration ofthe coal seam drilling gas are further improved.

Description

technical field [0001] The invention relates to the technical field of coal seam collaborative hole sealing methods, in particular to a coal seam spray reinforcement and graded grouting collaborative hole sealing method. Background technique [0002] With the gradual depletion of shallow coal resources, the mining of deep coal resources will become the norm in the future. However, after entering the deep part, the coal seam has high gas content and high pressure, which seriously threatens the safe production of the mine. Coalbed methane is a clean and efficient energy source and a strong greenhouse gas. According to statistics, the amount of coalbed methane resources buried at a depth of more than 2000m in my country is about 36.81 trillion m 3 , ranking third in the world. Among them, the coalbed methane resources with a buried depth between 1000 and 2000m account for 61.2% of the total national coalbed methane resources, and have extremely high mining value. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21B33/13E21F7/00E21B33/03E21B33/12
CPCE21B33/03E21B33/12E21B33/13E21D11/10E21F7/00
Inventor 刘厅赵洋林柏泉
Owner CHINA UNIV OF MINING & TECH
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