Method for sealing gas drainage boreholes at specified positions

A technology for gas drainage and drainage pipes, which is applied in the direction of sealing/packing, drill pipes, drilling pipes, etc. It can solve the problem of jamming at the deformation of the baffle plate or veil, failure to feed the gas drainage pipe, and poor sealing effect To solve problems such as good or bad, to achieve the effect of prolonging the effective extraction period, convenient operation, and good sealing effect
CN101845944AActive Publication Date: 2010-09-29CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Publication Date
2010-09-29

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Abstract

The invention relates to a method for sealing gas drainage boreholes at specified positions, which comprises a drainage tube, an injection tube and a flexible sleeve, the flexible sleeve is sleeved on the front part of the drainage tube, the injection tube is inserted into the flexible sleeve, and both ends of the flexible sleeve are then tightly bound on the drainage tube; the drainage tube and the injection tube are put into the specified position of a gas drainage borehole together, the injection tube injects sealing filling material into the hermetic flexible sleeve until the flexible sleeve is filled up with the sealing filling material, and after the filling material is expanded, the borehole is sealed. The distance between the outer end of the flexible sleeve and the orifice of theborehole is larger than 8m, and the length of the flexible sleeve is larger than 2m; the flexible sleeve consists of a cotton cloth sleeve section and an antistatic waterproof cloth sleeve section, and the waterproof cloth of the flexible sleeve is used for preventing the seepage of the sealing filling material; and the diameter of the flexible sleeve is larger than the diameter of the gas drainage borehole, so that the radially expanded sealing filling material can be tightly combined with the wall of the borehole. The method has the advantages of good borehole sealing effect, high drained gas concentration, long effective drainage time and simple and quick operation.
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Description

technical field

[0001] The invention relates to a fixed-point sealing gas drainage borehole method, which is suitable for precisely controlling the sealing depth and sealing position, increasing the sealing depth of the gas drainage borehole, and improving the gas drainage effect. Background technique

[0002] Gas is one of the five natural disasters in coal mines, which seriously threatens the safety of mines. In order to prevent and control gas disasters and ensure safe production in mines, mining coal seam or goaf gas by construction drilling is an effective measure to reduce the gas content in coal seam and gas emission in working face. The gas drainage rate of coal mines in my country is generally low. In addition to the influence of geological conditions such as low coal seam permeability coefficient, the main reason is that the quality of drilling hole sealing is poor, resulting in serious gas leakage and low concentration of gas drainage.

[0003] At present, my cou...

Claims

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