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Sealing method of water-containing drill hole for gas extraction

A technology for gas drainage and drilling, which is applied in the direction of gas discharge, sealing/seal, mining equipment, etc. It can solve the problems of sealing failure and poor sealing quality of drilling, and achieves small workload, low cost and good effect Effect

Inactive Publication Date: 2015-06-17
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, in most cases of borehole sealing, it is the influence of water in the borehole that leads to poor sealing quality of the borehole, and even causes sealing failure in gas drainage boreholes containing a large amount of water. Therefore, in order to solve The hole sealing technology of water-bearing gas drainage drilling is difficult, and it is urgent to study the sealing method of water-bearing gas drainage drilling to meet the requirements of coal mine drilling hole sealing

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  • Sealing method of water-containing drill hole for gas extraction

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Embodiment Construction

[0016] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] In the water-containing gas drainage drilling and sealing method of the present invention, firstly, drilling holes are drilled into the coal seam as usual, connecting multi-section gas drainage pipes 3, and feeding the gas drainage pipes 3 into the drilled holes. The diameter of the gas drainage pipes is 70 mm. , with a length of 12m; before feeding into the gas extraction pipe 3, bind a polyurethane reaction bag 10-1 for plugging holes at a distance of 2m from the front end of the gas drainage pipe 3; squeeze the polyurethane reaction bag 10-1 by hand, After fully mixing the materials in the polyurethane reaction bag 10-1, quickly send the gas drainage pipe 3 into the water-containing borehole 1; Bind the polyurethane reaction bag 2 10-2 for hole plugging at 12m, respectively connect the multi-section powder injection pipe 4 and the multi-section wa...

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Abstract

The invention relates to a sealing method of a water-containing drill hole for gas extraction, which is suitable for sealing work of the drill hole in a gas extraction drill hole with larger water content. The method comprises the steps of: connecting multiple gas extraction pipes integrally; binding a polyurethane reaction bag which is 2m away from the front end of the gas extraction pipes; feeding the gas extraction pipes into the water-containing drill hole quickly after adequately mixing materials in the polyurethane reaction bag; feeding the second batch of polyurethane reaction bag to a place which is 1m away from the orifice of the drill hole; after the materials in the polyurethane reaction bag react adequately, blowing water-absorbent resin materials to the drill hole space between the two batches of polyurethane reaction bags, wherein the water-absorbent resin materials are reacted with a great quantity of water in the drill hole space to generate liquid and solid phase colloidal agglomerates filling the drill hole space; and sealing the water-containing drill hole for gas extraction. The water-containing drill hole for gas extraction is effectively sealed, and the problem that the water-containing drill hole for gas extraction is hard to seal is solved. The sealing method of the water-containing drill hole for gas extraction is simple to operate, low in cost and good in effect.

Description

technical field [0001] The invention relates to a water-containing gas drainage borehole sealing method, which belongs to the technical field of gas control in the underground area of ​​coal mines, and is especially suitable for drilling hole sealing operations in gas drainage boreholes with relatively large water content. Background technique [0002] Gas accidents are the main disasters in coal mines. The national coal mine gas control policy determines that high-gas mines must be pumped before mining, and gas drainage is a permanent measure. The coal mine gas extraction rate in my country is generally low. In addition to the influence of geological conditions such as poor coal seam permeability, the main reason is the poor sealing quality of boreholes, especially in gas drainage boreholes with a large amount of water. Influence, resulting in poor sealing effect of drilling, or even sealing failure. The existing gas drainage borehole sealing methods all assume that the bor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B33/10
Inventor 翟成林柏泉倪冠华李全贵李敏
Owner CHINA UNIV OF MINING & TECH
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