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Method for blocking gas extraction boreholes with coal and rock debris as borehole sealing material

A technology for gas drainage and sealing materials, which is applied in the direction of gas discharge, sealing/seal, mining equipment, etc. It can solve the problems of incomplete sealing, cumbersome batching operations, and cost, so as to avoid waste of resources and simplify sealing The effect of plugging operation and simplification of hole sealing operation

Inactive Publication Date: 2015-07-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the formula of the sealing material used is very complicated, and the components in the formula are not available on the sealing site, and must be proportioned in advance and transported to the site, the batching operation is cumbersome, and the sealing material The price itself is not cheap, coupled with the cost of transportation, the sealing cost of this method is too high
(2) Using grouting equipment to pump the sealing slurry into the space of the plugging section, the pumping amount of the sealing slurry is difficult to control, and the grouting pressure that different coal and rock masses can bear is different, the pumping amount Too little will result in incomplete sealing of the holes, and too much pumping will cause the space pressure of the plugging section to be too high, resulting in the expansion of cracks in the coal and rock mass and the increase in the number of cracks, and the expansion and increase of cracks in the coal and rock mass are important in gas control It should be avoided as much as possible, which will adversely affect the sealing quality
(3) The drilling and sealing operations of the borehole are carried out separately, which is not conducive to the simplification of the operation. The coal cuttings and cooling drill bit water produced during the drilling of the borehole are discarded after being discharged from the borehole, resulting in a waste of resources. waste of

Method used

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  • Method for blocking gas extraction boreholes with coal and rock debris as borehole sealing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the schematic diagram of plugging the gas drainage borehole is shown in figure 1 , the total length of the gas drainage boreholes is 38m, in which the length of the primary borehole 3 is 12m, the included angle (elevation angle) α between the primary borehole and the horizontal plane is 60°, and the hole diameter is about 120mm. 4 has a length of 26m and a diameter of approximately 75mm.

[0025] (1) According to the actual engineering needs, it is determined that the coal seam that needs gas control is determined, and a drilling machine is installed in the coal seam bottom pumping roadway of the coal seam, and a drill bit with a diameter of 113mm and a drill pipe with a diameter of 50mm are used. A first-level borehole 3 is drilled on the coal rock mass 1 .

[0026] (2) Connect three gas drainage pipes 5 with an outer diameter of 85mm and an inner diameter of 75mm with joint sleeves 6 and adhesives. After the connection, the total length is 13.5m. ...

Embodiment 2

[0029] In this embodiment, the total length of the gas drainage boreholes is 35m, wherein the length of the primary borehole 3 is 8m, the included angle (elevation angle) α between the primary borehole and the horizontal plane is 30°, and the aperture is about 120mm. The secondary borehole 4 has a length of 27m and a diameter of about 75mm.

[0030](1) According to the actual engineering needs, it is determined that the coal seam that needs gas control is determined, and a drilling machine is installed in the coal seam bottom pumping roadway of the coal seam, and a drill bit with a diameter of 113mm and a drill pipe with a diameter of 50mm are used. A first-level borehole 3 is drilled on the coal rock mass 1 .

[0031] (2) Connect three gas drainage pipes 5 with an outer diameter of 85mm and an inner diameter of 75mm with joint sleeves 6 and adhesives. After the connection, the total length is 9m. Three wooden wedges 7 are fixed with steel wires at the joints of the pipes, an...

Embodiment 3

[0034] In this embodiment, the total length of the gas drainage borehole is 36m, wherein the length of the primary borehole 3 is 11m, the angle (elevation angle) α between the primary borehole and the horizontal plane is 80°, and the aperture is about 120mm. The secondary borehole 4 has a length of 25m and a diameter of about 75mm.

[0035] (1) According to the actual engineering needs, it is determined that the coal seam that needs gas control is determined, and a drilling machine is installed in the coal seam bottom pumping roadway of the coal seam, and a drill bit with a diameter of 113mm and a drill pipe with a diameter of 50mm are used. A first-level borehole 3 is drilled on the coal rock mass 1 .

[0036] (2) Connect three gas drainage pipes 5 with an outer diameter of 85 mm and an inner diameter of 75 mm with joint sleeves 6 and adhesives. After the connection, the total length is 12 m. Two wooden wedges 7 are fixed with steel wires at the joints of the pipes, and the ...

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Abstract

The invention provides a method for blocking gas extraction boreholes with coal and rock debris as a borehole sealing material. The method includes the steps that 1, the first-stage borehole is drilled in a coal and rock mass on the side of a bed plate tunnel of a coal seam needing gas control, wherein the included angle between the first-stage borehole and the horizontal plane ranges from 5 degree to 80 degrees; 2, a gas extraction tube where a wooden wedge is fixed is installed in the first-stage borehole, and then the section, close to an opening of the first-stage borehole, of the gas extraction tube is blocked through a sealing material; 3, a drill stem and a drill bit of drilling equipment are made to penetrate through the gas extraction tube to drill the second-stage borehole, water is injected to the drill bit through the hollow drill stem in the process of drilling the second-stage borehole, the water which has exchanged heat with the drill bit washes the coal and rock debris generated in drilling of the second-stage borehole downwards along the hole wall, the space between the outer wall of the gas extraction tube and the inner wall of the first-stage borehole is backfilled with the coal and rock debris, the water which is not absorbed by the coal and rock debris passes through the backfilling coal and rock debris and then flows out from the opening end of the first-stage borehole, drilling is stopped after the depth of the second-stage borehole reaches a design depth, and blocking of the gas extraction boreholes is completed after the backfilling coal and rock debris is solidified.

Description

technical field [0001] The invention belongs to the technical field of mine safety, and in particular relates to a method for plugging a gas extraction hole by using coal cuttings as a hole sealing material. Background technique [0002] Gas has always been the main factor affecting the safe production of coal mines. As the mining depth of coal mines increases, gas disasters will become more and more obvious. A large number of shallow low-gas mines are gradually turning into high-gas mines. The number of gas accidents and the fatality rate are increasing year by year. The damage of gas to the atmospheric environment is also very serious, and the ability of gas to destroy the ozone layer is CO 2 7 times that of CO, the greenhouse effect it produces is CO 2 21 times. At the same time, gas is also a clean, efficient and safe new energy source. Effective control of gas is not only of great significance to coal mine safety and environmental protection, but also can alleviate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/10E21F7/00
CPCE21B33/13E21F7/00
Inventor 高明忠谢晶张茹徐晓炼邱志强李圣伟谭强
Owner SICHUAN UNIV
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