A gas extraction device and a gas extraction method using a multi-channel gas extraction pipe

By adopting multi-channel gas extraction pipes in coal mine gas management, and using plate-shaped reinforcement ribs and four-hole plum blossom-shaped breathable holes, the problem of gas extraction pipes being easily blocked after the drilling collapse is solved, and the stability and efficiency of gas extraction are improved.

CN113605963BActive Publication Date: 2025-03-25HUAINAN MINING IND GRP
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Patent Information

Application Number
CN202111042887.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-09-07
Publication Date
2025-03-25
Estimated Expiration
2041-09-07

AI Technical Summary

Technical Problem

The PVC casing in existing coal mine gas treatment is easily flattened and blocked after the drilling hole collapses, and there is only one drainage channel that is easy to block. When drilling downward, the complexity cost of the water blowing pipe needs to be increased. The air permeable hole is prone to inhaling large particles of cinder slag, causing blockage.

Method used

A multi-channel gas extraction tube is used, and the casing is divided into at least two channels by plate-shaped reinforcement ribs to increase compressive resistance. The multi-channel design avoids blockage. A four-hole plum blossom or five-hole plum blossom design is used in the breathable hole to prevent large particles from entering.

Benefits of technology

After the drilling collapses, the multi-channel gas extraction pipe can maintain compressive resistance, avoid blockage, simplify the construction process of downward drilling, improve gas extraction efficiency, and enhance the compressive and tensile strength of the casing.

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Abstract

The invention discloses a multi-channel gas extraction pipe, an extraction device and an extraction method, and relates to the technical field of coal mining; the gas extraction pipe comprises a casing, which is a circular ring-shaped cylinder, the casing is divided into at least two channels along the length direction of the casing by plate-shaped reinforcement ribs, and the casing is provided with air holes; the extraction device comprises a plurality of gas extraction pipes, two adjacent gas extraction pipes are connected by a connecting pipe, and the ends of the gas extraction pipes are fixed to a plug; the extraction method comprises the following steps: S1: connecting the plug, the gas extraction pipe and the connecting pipe to form an extraction device; S2: placing the extraction device into a borehole; S3: one or more channels in the extraction device perform normal gas extraction work, and other channels perform air blowing; the invention provides an extraction device that can still work normally after the borehole collapses and can also blow air while performing normal extraction work.
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