Gas extraction downward hole sealing device and hole sealing method adopting same

A technology of gas drainage and hole sealing device, which is applied in the direction of gas discharge, safety device, sealing/isolation, etc. It can solve the problems of poor sealing, reduce the occupied space, save the cost of a single hole, and improve the quality of sealing Effect

Inactive Publication Date: 2018-10-09
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problems, the present invention proposes a gas drainage downward hole sealing device, which adopts the method of "one block and one injection" to seal the borehole, which effectively solves the problem of poor sealing performance and improves the concentration of gas drainage ; The present invention also proposes a hole sealing method based on the hole sealing device

Method used

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  • Gas extraction downward hole sealing device and hole sealing method adopting same
  • Gas extraction downward hole sealing device and hole sealing method adopting same
  • Gas extraction downward hole sealing device and hole sealing method adopting same

Examples

Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 As shown in the figure, a downward hole sealing device for gas drainage includes two bundled pipes, which are respectively used as a extraction pipe 1 and a drainage pipe 2. The two bundled pipes go down to the bottom of the coal seam 3 at the bottom of the hole. There is a flower eye 4 in the area between the road bundle pipe down to the coal seam bottom plate and the hole bottom section; a sealing bag 5 is sleeved on the two road bundle pipes, and the sealing bag 5 is arranged at the bottom of the seat in the hole is used to seal the hole 6; the sealing bag 5 is also provided with a grouting pipe 7, and the grouting pipe 7 is inserted into the sealing bag 5 along the hole 6 for feeding The grouting is carried out in the sealing pouch 5 and in the drilled hole 6 .

[0026] In order to reduce the problem of air leakage at the splicing point, the two bundles of tubes are all made of a whole-disk type of polyvinyl chloride bundled tubes.

[0027] The lower...

Embodiment 2

[0030] A method for sealing down holes in gas drainage, using the above-mentioned device for sealing down holes in gas drainage, comprising the following steps:

[0031] 1) Downpipe: use a metal probe to go into two-way bundles from the orifice to the bottom of the hole, and the two-way bundles are respectively used as the extraction pipe 1 and the drain pipe 2; One way of casing is used to abut the drill bit, and the bundled tube is provided with a flower hole 4 in the area between the bottom of the coal seam 3 and the bottom of the hole.

[0032] 2) Capsule fixation: After the two-way bundle tubes are in place, the sealing capsular bag 5 is put on the two-way capsular tube, and the sealing capsular bag 5 is sent into the hole with a metal probe for seating. sealing;

[0033] 3) Install the grouting pipe: set the grouting pipe 7 at the orifice, and the grouting pipe 7 is inserted into the sealing bag 5 along the drilled hole 6;

[0034] 4) Grouting with grouting pipe: mix t...

Embodiment 3

[0036] Contrast construction situation of on-site mining and sealing of a track along the roof roadway:

[0037] (1) Site geological conditions and design specifications

[0038] The maximum gas pressure of the 1151(1) track along the roof roadway is 0.78MPa, and the maximum gas content is 4.83m3 / t. The design length is 2141m, the section specification: width × height (net) = 5200 × 3800mm (net), anchor net cable + set of 29U shed support. A drilling field is arranged every 50 meters in the roadway. Drilling holes are drilled down to the layers in the drilling field and the roadway. A group of drilling holes is designed every 10 meters along the direction of the roadway, with 10 drilling holes in each group. It is required to seal the hole with casing during the whole drilling process, and the length of the sealing hole shall not be less than 12 meters.

[0039] (2) Comparison of drilling and sealing construction

[0040] The first group adopts the traditional two-plug and ...

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Abstract

The invention discloses a gas extraction downward hole sealing device and further discloses a hole sealing method based on the gas extraction downward hole sealing device. The gas extraction downwardhole sealing device comprises a two-way bundle tube, wherein the two ways of bundle tube bodies serve as an extraction tube and a drainage tube correspondingly. The two-way bundle tube is put downwards to a coal seam floor at the hole bottom, and holes are formed in the part, put downwards to the area between coal seam floor and the hole bottom section, of the two-way bundle tube; the two-way bundle tube is sleeved with a hole-sealing pocket, the hole-sealing pocket is arranged at the in-hole base bottom and used for sealing a drilled hole; and a slurry-injection tube is further arranged on the hole-sealing pocket, inserted into the hole-sealing pocket along the drilled hole and used for injecting slurry into the hole-sealing pocket and the drilled hole. The gas extraction downward hole sealing device has the advantages that the influence of joint air leakage on the extraction effect is avoided, the occupied space of a sleeve in the hole is reduced, the hole-sealing quality is improved, and the extraction concentration is increased by six times or above; and hole-sealing materials are simple, and the single hole cost is relatively saved by 50%.

Description

technical field [0001] The invention relates to the technical field of coal mine gas treatment, in particular to a downhole sealing device for gas drainage and a sealing method thereof. Background technique [0002] Coal mine gas extraction is to drill into the coal seam and the gas accumulation area, connect the borehole to a special pipeline, and use the extraction equipment to pump the gas in the coal seam and goaf to the ground for use; or discharge it to the total return air flow middle. Gas extraction is not only an important measure to reduce the gas gushing volume during the mining process, prevent the gas exceeding the limit and accumulation, and prevent the gas explosion and coal and gas outburst accidents, but also can be used as a resource for development and utilization as a resource associated with coal. . [0003] Hole sealing is an important technology in coal mine gas extraction drilling, and the tightness of the drilling directly affects the drainage effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B33/12E21F7/00E21B43/00
CPCE21B33/12E21B33/13E21B43/006E21F7/00
Inventor 刘东生余岩
Owner HUAINAN MINING IND GRP
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