Coal seam spray reinforcement and graded glue injection collaborative sealing method

A technology of glue injection and coal seam, which is applied in earthwork drilling, sealing/packing, wellbore/well components, etc., can solve the problems of insignificant gas drainage effect and poor hole sealing effect, etc. Concentration, low cost and saving effect of coal seam gas drainage

Active Publication Date: 2020-11-10
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

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  • Coal seam spray reinforcement and graded glue injection collaborative sealing method

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Embodiment Construction

[0024] The specific embodiments of the present invention will be briefly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art can obtain all other implementations without creative work. For example, all belong to the protection scope of the present invention.

[0025] figure 1 The preferred embodiments of the present invention are shown and analyzed in detail.

[0026] like figure 1 The shown method of coal seam spraying reinforcement and graded glue injection synergistic sealing method includes the following steps:

[0027] Step 1: After the coal seam roadway is excavated, a fissure zone is formed on and around the roadway wall, spraying slurry on the roadway wall to reinforce the roadway wall, and forming an isolation barrier 8 to initially block the r...

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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 a coal seam cooperative sealing method, in particular to a coal seam spraying reinforcement and graded glue injection cooperative sealing method. Background technique [0002] With the gradual exhaustion of shallow coal resources, the mining of deep coal resources will become the norm in the future. However, after entering the deep, the coal seam has high gas content and high pressure, which seriously threatens the safe production of the mine. CBM is a clean and efficient energy source and a strong greenhouse gas. According to statistics, the amount of CBM resources buried at a depth of more than 2000 m in my country is about 36.81 trillion m. 3 , ranking third in the world. Among them, the coalbed methane resources buried between 1000 and 2000m account for 61.2% of the total coalbed methane resources in the country, and have extremely high mining value. Therefore, realizing the efficient development o...

Claims

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Application Information

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Patent Type & Authority Patents(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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