Pressure-controlled hole sealing method for gas drainage hole

A technology of gas drainage and pressure sealing, which is applied in the fields of gas discharge, mining equipment, earthwork drilling, etc., and can solve the problems of poor sealing of drilling holes and poor sealing quality

Inactive Publication Date: 2012-10-03
HEBEI TONGCHENG MINING TECH
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing open-type non-pressure sealing method for the underground drainage hole sealing process of coal mines, the poor sealing of the drilling hole, and the poor quality of the hole sealing. The flow rate stabilizes the grouting slurry at a certain pressure for a period of time to achieve pressure-controlled grouting, achieve good sealing of the orifice pipe, good sealing quality, and high labor efficiency. A pressure-controlled sealing method for gas drainage holes

Method used

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  • Pressure-controlled hole sealing method for gas drainage hole

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Embodiment Construction

[0015] Refer to attached figure 1 , the gas drainage hole pressure-controlled sealing method provided by the embodiment of the present invention can be carried out through the following seven steps:

[0016] a. Firstly, according to the known coal seam gas content, air permeability coefficient and surrounding geological conditions in the mining area, the drilling parameters and layout are reasonably designed;

[0017] b. Measure and set out according to the design, carry out the drilling operation, complete the drilling, and set the gas drainage drilling 2 on the coal body 1;

[0018] c. Install the gas drainage pipe 6, place the gas drainage pipe 6 in the gas drainage borehole 2, set a sealing cloth bag 3 at the end of the gas drainage pipe 6 close to the bore hole, and set the other end of the gas drainage pipe 6 There is a sealing cloth bag 9, the sealing cloth bag 3 is provided with a grouting pipe 4, the sealing cloth bag 9 is provided with a grouting pipe 8, and the sea...

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Abstract

The invention relates to a pressure-controlled hole sealing method for a gas drainage hole. Two hole sealing cloth bags, which serve as two separation sections, are arranged at the two ends of a hole sealing section of the gas drainage hole, and a macromolecular material is injected to the hole sealing section between the two separation sections until a certain pressure is reached, so that the macromolecular material can be fully filled in the hole sealing section and can permeate into cracks in a hole wall. Thus, the pressure-controlled hole sealing method for the gas drainage hole has the advantages of excellence in sealing of a borehole pipe, good quality in hole sealing, and high labor efficiency, and the gas drainage rate is increased from the original 30% to 80%.

Description

technical field [0001] The invention relates to a method for pressure-controlled sealing of gas drainage holes. Background technique [0002] At present, the sealing process of underground coal mine drainage holes generally uses cloth dipped in chemical slurry to wrap the outer wall of the gas drainage pipe to fill the gap between the drainage pipe and the hole wall. It is a non-pressure sealing technology and an authentic The traditional open hole sealing method has many shortcomings: if the surrounding rock and coal seam lithology in front of the drilling opening position is variable, there are broken and weak structures, the cracks in the rock and coal seam cannot be filled, let alone Penetrating into the cracks of the broken surrounding rock, resulting in poor sealing of the borehole and poor sealing quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing open-type pressur...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B33/13
Inventor 宋彦波
Owner HEBEI TONGCHENG MINING TECH
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