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Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method

A technology of gas drainage and hole sealing device, which is applied in the direction of gas discharge, safety device, sealing/isolation, etc., and can solve problems such as not being able to achieve the best sealing effect

Inactive Publication Date: 2009-07-15
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for low coal seams, the one-time low-pressure bag grouting and sealing method cannot achieve the best sealing effect.

Method used

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  • Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method
  • Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method
  • Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method

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Embodiment Construction

[0025] Such as figure 1 , figure 2 , Figure 7 , Figure 8 As shown, the secondary high-pressure grouting and sealing device for gas drainage includes a drainage pipe 1 and a bladder 4, and also includes a tubular secondary slurry feeding device 6, and the two sides of the secondary slurry feeding device 6 are butt-connected with drainage pipes 1. The pipe wall of the secondary pulp feeding device 6 is provided with an axial exhaust hole 13 connecting the extraction pipes 1 on both sides, and the inner pipe wall of the secondary pulp feeding device 6 is provided with a reinforced steel pipe 12. The extraction pipes 1 connected on both sides of the device 6 are provided with plugs 5 respectively, and a bag 4 is arranged between each plug 5 and the side adjacent to the secondary slurry feeding device 6, and an exhaust device is provided on the bag 4 , the exhaust device is a puncture microhole 2 arranged on the pouch 4, and the pouch 4 can be composed of a variable-diameter ...

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Abstract

A secondary high-press pulp injection and hole sealing device for collecting gas comprises collection pipes, bags and a secondary pulp inflow device, wherein collection pipes are connected with two sides of the secondary pulp inflow device; plugs are sleeved on the collection pipes; the bags are located between each plug and the secondary pulp inflow device; three pulp inflow holes having unidirectional valves are arranged on the secondary pulp inflow device; the pulp inflow holes on the two sides communicate with the bags on the same side; and the pulp inflow hole in the middle spatially communicates with the bags. A method of using the device for pulp injection and hole sealing comprises the following steps of: inserting a pulp injection plug in the secondary pulp injection device and performing the low-pressure pulp injection to the pulp inflow holes that communicate with the bags; and after the injected pulp is solidified, performing the high-pressure pulp injection to the pulp inflow hole in the middle of the secondary pulp inflow device by using the pulp injection plug. The invention adopts the pulp injection materials to inject the pulp to the drill hole wall so as to seal the drill hole wall and the peripheral deflated passages thereof, and basically eliminates the drill deflated cracks through the primary low-pressure pulp injection and the secondary high-pressure pulp injection close to the ground stress.

Description

technical field [0001] The invention relates to a secondary high-pressure grouting hole sealing device for gas drainage and a hole sealing method thereof, especially suitable for gas drainage sealing and gas pressure testing of holes drilled in the coal seam under a coal mine. Background technique [0002] The drilling depth of underground drainage is generally 30 meters to hundreds of meters, and only a certain distance from the hole is sealed, and it is difficult to seal the hole by direct grouting. Sealing is divided into permanent sealing and temporary sealing. At present, the known permanent sealing of drilling holes for gas drainage in this coal seam uses foamed polyurethane, foamed cement and other foaming materials as sealing materials. The early "cement roll sealing device" (ZL90227075.3) It is no longer used. The drilling and grouting sealing method is only suitable for inclined drilling, and it is rarely used due to the inconvenience of operation. At present, foa...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B33/13
Inventor 孙玉宁熊祖强张海军赵长春张国平王军宋维宾吕有厂
Owner HENAN POLYTECHNIC UNIV
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