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Pretreatment method for improving compactness of coal seam water injection hole

A coal seam water injection and pretreatment technology, which is applied in earthwork drilling, sealing/packing, wellbore/well components, etc., can solve the problems of coal not being wet, water loss, weakening coal water injection and dust reduction, etc., to achieve protection Effects of life health, improvement of humidity level, and reduction of water loss

Inactive Publication Date: 2015-07-08
CHINA UNIV OF MINING & TECH
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Problems solved by technology

As a result, after water is injected into the water injection hole, the water will be lost through these cracks, so that the coal body cannot be completely wetted, which seriously weakens the effect of water injection on the coal body to reduce dust

Method used

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  • Pretreatment method for improving compactness of coal seam water injection hole

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, after the coal seam water injection hole 1 is formed by drilling the coal seam 11, the coal seam is deformed and displaced due to the damage to the coal seam 11 caused during the drilling process, resulting in the expansion and development of the fracture group 7 in the coal seam around the coal seam water injection hole 1, Some develop to the position of the coal wall to communicate with the outside world, and some communicate with the bolt hole 10 that has been formed before. Therefore, in the next water injection process, the water will be lost through these cracks, so that the coal seam can be injected with water to wet the coal body. Significantly decreased. Pretreatment method of the present invention is specifically:

[0021] (1) The first gas expansion capsule 2 is connected to the first air pressure pipe 3, and the first gas...

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Abstract

The invention discloses a pretreatment method for improving the compactness of a coal seam water injection hole. After the water injection hole is drilled, an air chamber is artificially manufactured by use of an air expansion capsule, and then compressed air is applied to feeding dry fine expansion powder into the coal seam water injection hole under a certain pressure; the dry fine expansion powder infiltrates in to a pore (crack) region surrounding the hole under the action of the positive pressure of the compressed air; after the dry fine expansion powder goes into the cracks, the flowing resistance of a fluid in the cracks is increased on one hand, and on the other hand, after water is injected in the later period, the powder expands in water, and therefore, the leakage path can be effectively blocked and the loss of water in the water injection hole is obviously reduced, and moreover, the wet degree of the coal can be greatly improved; when the coal is mined, the dust production amount is effectively reduced, the working environment is remarkably improved and the life health of workers is protected.

Description

technical field [0001] The invention relates to a pretreatment method for improving the compactness of coal seam water injection holes, which can improve the compactness of coal seam water injection holes at mining working faces and the like in mines. Background technique [0002] Coal seam water injection is one of the most important dust prevention measures in coal mines, especially for coal dust prevention in mining face. It is to drill a number of holes in the coal seam before mining, and inject pressure water through the holes to make it penetrate into the coal body, increase the moisture in the coal and the adhesion between dust particles, reduce the strength and brittleness of the coal, and increase the plasticity. , to reduce the amount of coal dust generated during coal mining; at the same time, the primary fine dust in the coal body is bonded into larger dust particles, making it lose its ability to fly. Therefore, the sealing quality of water injection holes is t...

Claims

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Application Information

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IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 程健维李思远陈松杜志杰蒋敬成赵增辉陈顺
Owner CHINA UNIV OF MINING & TECH
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