Method for gas extraction secondary hole sealing based on swelling agent

A secondary sealing and gas drainage technology, which is applied in gas discharge, mining equipment, earthwork drilling, etc., can solve problems such as cumbersome pressurization process, poor one-time sealing effect, and unbalanced slurry pressure , to achieve the effect of improving

Inactive Publication Date: 2017-02-22
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Gas drainage is an important measure to prevent coal and gas outburst. However, due to changes in the pressure state of the surrounding rock during the extraction process, cracks are developed, and the one-time sealing effect is not good.
leading to a reduction in extraction efficiency
The existing secondary sealing method requires continuous pressurized grouting, and the location of the pressure point for the slurry is single, which easily leads to uneven pressure applied by the slurry to the cracks
The pressurization process is cumbersome and requires continuous pressurization

Method used

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  • Method for gas extraction secondary hole sealing based on swelling agent
  • Method for gas extraction secondary hole sealing based on swelling agent
  • Method for gas extraction secondary hole sealing based on swelling agent

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Embodiment Construction

[0019] The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

[0020] A kind of secondary sealing pressure measurement device based on expansion agent, refer to the attached Figure 1-3 , consisting of air intake flower tube 1, independent conduit 2, pressure gauge 3, high-pressure independent water bag 4, water injection conduit 5, water injection pump 6, high-pressure independent expansion bag 7, water injection pipe 8, expansion agent filling pipe 9, limit chain 10 , Limiting plate 11, grouting pump 12, grouting conduit 13, grouting cavity 14 components.

[0021] Secondary sealing and pressure measurement device based on expansion agent Sealing and pressure measurement: including the following steps: (1) The air intake flower pipe 1 is connected to the independent conduit 2, both pipes are steel conduits, and a pressure gauge is installed behind the independent conduit 2 3. The high-pressure independent water bag 4 sui...

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Abstract

The invention relates to a method for gas extraction secondary hole sealing based on a swelling agent. The method comprises the following steps: encircling an annular cavity for primary hole sealing by utilizing the coordination of the inherent capsule shape, the swelling agent filling and the high-pressure independent water bag support; filling yellow slurry and performing the primary hole sealing; after extracting for a period of time, adding water into the swelling agent and causing the swelling agent swell; supplying vertical axial pressure; and extruding the yellow slurry and blocking the crack, thereby performing the secondary hole sealing. The method has the advantages of simple operation, high hole-sealing efficiency and good hole-sealing effect. A method support can be supplied for the gas extraction secondary hole sealing.

Description

[0001] Technical field: [0002] The invention relates to a secondary hole sealing method for gas drainage based on an expansion agent, in particular to a method for secondary sealing of drainage drilling holes through expansion and pressure. [0003] Background technique: [0004] At present, coal and gas outbursts are an important factor threatening the safe production of mines. Gas drainage is an important measure to prevent coal and gas outburst. However, due to changes in the pressure state of the surrounding rock during the extraction process, cracks are developed, and the one-time sealing effect is not good. lead to a reduction in extraction efficiency. The existing secondary sealing method requires continuous pressurized grouting, and the location of the pressure point for the slurry is single, which easily leads to uneven pressure applied by the slurry to the cracks. The pressurization process is cumbersome and requires continuous pressurization. Therefore, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21F7/00
CPCE21B33/13E21F7/00
Inventor 张嘉勇巩学敏周凤增王凯郑庆学吕志强郭达武建国周宝生孙胜
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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