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Gas extraction hole drilling and hole sealing method for building anti-seepage barrier based on grooving-backfilling method

A technology of gas drainage and grooving, which is applied in the fields of gas drainage drilling and sealing and bedding drilling, which can solve problems such as insufficient construction volume, limited penetration distance of grouting pressure, and increased engineering difficulty. Achieve the effects of reducing the amount of sealing work, wide applicability, and saving grouting materials

Inactive Publication Date: 2019-01-18
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the viscosity and particle size of the material itself, the penetration distance of the grouting pressure in the coal fracture is limited
In addition, in theory, the greater the distance of the sealing section in the funnel-shaped strong air leakage area, the closer to the strong seepage boundary, but in actual operation, the sealing pipe is generally at most about 15m down, and the long-distance sealing is more difficult, which greatly increases the difficulty of the project At the same time as the construction volume, the air leakage problem of the drainage drilling is not well solved

Method used

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  • Gas extraction hole drilling and hole sealing method for building anti-seepage barrier based on grooving-backfilling method
  • Gas extraction hole drilling and hole sealing method for building anti-seepage barrier based on grooving-backfilling method

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Effect test

Embodiment 1

[0017] A kind of grooving-backfilling method of embodiment 1 builds the gas drainage drilling sealing method of anti-seepage barrier, concrete steps are as follows (coal quality is harder):

[0018] (a) First drill the borehole 2 for gas drainage to the designed final hole position;

[0019] (b) Replace the hydraulic slit drill bit, and perform hydraulic grooving at a depth of 6m from the orifice, and flush out the coal body in the strong air leakage area 1 of the coal body caused by roadway stress around the drill hole 2, forming a wedge-shaped disc Space 8, the disc radius is 0.5m;

[0020] (c) Send the installed gas drainage pipe 3 with two plugging capsules into the borehole 2, the distance between the two plugging capsules is 5m, and make the wedge-shaped circle cut out in step (b) The disc space 8 is between two sealed capsules;

[0021] (d) The sealing grouting pipe 4 is connected to the grouting pump, and the expansion cement slurry is injected between the sealing ca...

Embodiment 2

[0025] A kind of hydraulic cutting groove of embodiment 2 builds the gas drainage drilling hole sealing method of anti-seepage barrier, concrete steps are as follows (coal quality is softer):

[0026] (a) First drill the borehole 2 for gas drainage to the designed final hole position;

[0027] (b) Replace the hydraulic slit drill bit, and perform hydraulic grooving at a depth of 8m from the orifice, and flush out the coal body in the strong air leakage area 1 of the coal body caused by roadway stress around the drill hole 2, forming a wedge-shaped disc Space 8, disk radius 0.9m;

[0028] (c) Send the installed gas drainage pipe 3 with two plugging capsules into the borehole 2, the distance between the two plugging capsules is 6m, and make the wedge-shaped circle cut out in step (b) The disc space 8 is between two sealed capsules;

[0029] (d) The plugging grouting pipe 4 is connected to the grouting pump, and the polyurethane grout is injected between the plugging capsule 6 ...

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Abstract

A gas extraction hole drilling and hole sealing method for building an anti-seepage barrier based on a grooving-backfilling method is disclosed. The method comprises the following steps: a wedge-shaped and disc-shaped space is drawn out in a coal body strong air leakage area, positioned at a distance of 6 to 8 m from an orifice of a borehole, around the borehole; a hole sealing capsule is arrangedin each of front and rear boreholes of the wedge-shaped and disc-shaped space, sealing material is injected into the hole sealing capsule and a hole sealing section, and the wedge-shaped and disc-shaped space is fully backfilled; the anti-seepage barrier that blocks an air leakage passageway is formed, and hole sealing operation is completed. Via the hole drilling and hole sealing method disclosed in the invention, the air leakage area around the borehole can be effectively sealed, the air leakage passageway can be blocked, extracted gas concentration and coal seam gas extraction rates can beimproved to an maximum degree, a sealed hole is small in length, excellent hole sealing effects can be realized, injecting paste material can be saved, and engineering work quantities of hole sealingcan be greatly reduced.

Description

technical field [0001] The invention relates to a hole sealing method for gas drainage drilling, in particular to a gas drainage drilling sealing method for constructing an anti-seepage barrier by cutting a groove and backfilling method, which is suitable for pre-extraction and pre-mining of the coal seam and adjacent layers. It is used for the sealing of boreholes for pressure relief and gas drainage during mining, especially suitable for drilling along bedding. Background technique [0002] As an associated resource of coal, coal seam gas is an efficient and clean energy with a calorific value of 35.9MJ / m 3 , equivalent to 1.2kg of standard coal. At the same time, the gas disaster is also one of the main factors that plague the safe production of coal mines. China is a large coal-producing country, and it is also the country with the most severe coal mine gas disasters. High gas mines account for 50% to 70%. And with the increase of mining depth, the gas content and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B7/18
CPCE21B7/18E21B33/13
Inventor 刘洪永郝从猛程远平张开仲王振洋赵忻郝志远张锐
Owner CHINA UNIV OF MINING & TECH
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