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Multistage pressure-bearing type penetrating sealing method and device

A hole sealing device and permeable technology, which is used in earth-moving drilling, sealing/sealing, wellbore/well components, etc., can solve the leakage gap between the bag and the sidewall of the borehole, low strength, unable to support the grouting pressure and other problems, to achieve the effect of promoting comprehensive mining and utilization, enhancing the degree of penetration, and shortening the time to reach the standard of extraction.

Active Publication Date: 2018-04-20
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional "two blocks and one injection" sealing method is sealed with two ends of the hole, and only relies on the frictional resistance between the bag and the side wall of the borehole to seal the hole. Leakage gaps, thus unable to support large grouting pressure
The above reasons limit the "two plugs and one injection" method to further improve the sealing quality

Method used

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  • Multistage pressure-bearing type penetrating sealing method and device

Examples

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Effect test

Embodiment 1

[0022] A multi-stage pressure-bearing permeable hole sealing method, specifically comprising the following steps:

[0023] 1) Multi-stage expansion sealing is carried out at the position to be plugged in the drilled hole. The number of expansion sealing sections is not less than four sections, and a permeable sealing section is left between adjacent expansion sealing sections;

[0024] 2) Carry out multi-stage interval grouting for the seepage sealing section, and leave a seepage sealing section for the next level of grouting between the seepage sealing sections of the previous level of grouting; after the completion of the previous level of grouting, Then carry out the next level of grouting; the pressure of the next level of grouting is greater than the pressure of the previous level of grouting;

[0025] 3) When the grouting pressure of the permeable sealing section of the final stage of grouting reaches the predetermined value, the sealing is completed.

[0026] As a pref...

Embodiment 2

[0029] Such as figure 1 As shown, a multi-stage pressure-bearing permeable hole sealing device includes two bladders 2 sleeved on the main body 1, and the distance between the two bladders is determined according to the length of the sealing section; the main body 1 is provided with a grouting pipe 4 connected with each bladder, and the grouting tube 4 is provided with a blast valve 3 between the two bladders; the bladder 2 includes a sealing section at both ends and a permeation section in the middle. The pouch 2 includes a permeable bag body 2a located in the inner layer, and the two ends of the permeable bag body 2a are covered with a sealing layer 2b, the part covered by the sealing layer 2b is the sealing section, and the uncovered part is the permeable section. According to the actual use effect, the total length of the pouch 2 is preferably 0.8-1.2m, and the length of the permeable section located in the middle is preferably 0.3-0.5m.

[0030] When in use, grout is inj...

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Abstract

The invention relates to a multistage pressure-bearing type penetrating sealing method and device. The method comprises following steps: 1) performing multistage expansion hole sealing at positions tobe sealed of a borehole, wherein the number of expansion hole sealing segments is no less than four and penetrating sealing segments are kept between adjacent expansion sealing segments; 2) performing multistage interval grouting on the penetrating sealing segments, penetrating sealing segments for grouting of a next level are kept between penetrating sealing segments of grouting of an upper level; performing grouting of the next level after the grouting of the upper level is finished; the pressure of the next level grouting is larger than that of the upper level grouting; 3) after the grouting pressure of the penetrating sealing segment of the final level reaches a preset value, the hole sealing is finished. The invention can increase the grouting pressure on the basis of the traditionaltwo-plugging and one-hole sealing method, thereby improving the sealing quality, solving the problem of low gas concentration in the coal mine, and realizing the high concentration and high quality gas drainage in the mine drainage drilling.

Description

technical field [0001] The invention specifically relates to a multistage pressure-bearing permeable hole sealing method and device, belonging to the technical field of coal mining. Background technique [0002] The quality of hole sealing during coal mine gas drainage determines the degree of gas drainage. With the advancement of technology, the "two plugging and one injection" sealing method is gradually adopted at present. The specific principle is: first, the two ends of the sealing section are sealed with grouting expansion, and then the two ends are sealed through the grouting pipe. Grouting is performed on the borehole section between the plugging sections of the end pockets. Under the action of grouting pressure, the grout penetrates into the borehole wall and fills the cracks around the borehole. [0003] The advantage of the "two blocks and one injection" grouting method under pressure is that it realizes the grouting of the borehole wall, and supports the borehol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12E21B33/13
CPCE21B33/1208E21B33/13
Inventor 李辉魏建平程磊
Owner HENAN POLYTECHNIC UNIV
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