Method for improving hole sealing performance in gas extraction

A technology of gas drainage and airtightness, which is applied in the direction of gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of low gas drainage concentration, low drainage efficiency, and reduce the decay speed of gas concentration, so as to improve the utilization High efficiency, broad application prospects, and the effect of improving airtightness

Inactive Publication Date: 2014-07-02
CHINA COAL TECH ENG GRP CHONGQING RES INST
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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a method for improving the airtightness of gas drainage sealing holes, which overcomes the problem of low gas drainage efficiency caused by low gas drainage concentration in the prior art, and significantly reduces the gas concentration decay speed

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  • Method for improving hole sealing performance in gas extraction
  • Method for improving hole sealing performance in gas extraction
  • Method for improving hole sealing performance in gas extraction

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Embodiment Construction

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0024] A kind of method for improving the airtightness of gas drainage sealing hole of the present embodiment comprises the following steps:

[0025] Step 1: Use sealing material to seal the drilling sealing section and the cracks generated by drilling vibration;

[0026] The second step: using reinforcement materials to reinforce and seal the cracks in the loose coal and rock mass near the drilling sealing section;

[0027] The third step: use the spraying material to spray the surface of the coal wall near the hole opening of the drilling hole sealing section.

[0028] In this embodiment, the method of combining the three processes of sealing, reinforcement and spr...

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Abstract

The invention discloses a method for improving hole sealing performance in gas extraction. The method includes the steps of 1), using hole sealing materials to seal hole sealing sections of a drill hole and cracks generated from vibration of the drill hole; 2), using reinforcing materials to reinforce coal-rock mass loosened belts nearby the hole sealing sections of the drill hole and seal the cracks; 3), using spraying materials to perform surface spraying upon coal walls nearby openings of the hole sealing sections of the drill hole. By the method in combination of processes of hole sealing, reinforcing and spraying, the cracks causing air leakage can be effectively sealed, the hole sealing performance in the gas extraction can be remarkably improved, and the problem about fast concentration attenuation in the gas extraction is fundamentally solved, so that the concentration of the gas extraction is much higher than that of an extraction process adopted in an existing coal mine, utilization rate of gas energy is increased, coal mine safety is improved, and broad application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of gas drainage drilling and sealing, and in particular relates to a method for improving the airtightness of gas drainage sealing holes. Background technique [0002] Gas is an associated gas in the process of coal generation, and its main component is methane. Gas has long played three different roles. First of all, gas is the number one killer of coal mining. Among major coal mine accidents in my country, gas explosions account for about 70% to 80%. Secondly, gas is a dangerous greenhouse gas, and its greenhouse gas effect is 21% that of carbon dioxide. Finally, gas is an important clean energy source. The total amount of coalbed methane resources buried at a depth of less than 2,000 meters in my country is as high as 36.8 trillion cubic meters, which is equivalent to domestic conventional natural gas reserves. [0003] According to statistics, the average mine gas extraction rate in major coal-producing...

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Application Information

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IPC IPC(8): E21B33/10E21F7/00
Inventor 许向彬刘标懿胡澜童宗豪李王林刘青樊淑兰刘罡
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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