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Liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for low-permeable coal seam

A technology of gas drainage and coal seam gas, which is applied in the direction of gas discharge, mining equipment, mining fluid, etc., to achieve good gas drainage effects, prevent coal and gas outburst accidents, and increase the amount of gas drainage

Active Publication Date: 2016-12-07
CHONGQING UNIV
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Problems solved by technology

Therefore, the existing gas drainage methods also have major safety problems in field practice.

Method used

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  • Liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for low-permeable coal seam
  • Liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for low-permeable coal seam
  • Liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for low-permeable coal seam

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0062] Such as figure 1 As shown, a low-permeability coal seam liquid-phase CO2 phase change fracturing anti-permeability mesh gas drainage method includes the following steps:

[0063] 1) Construction floor road

[0064] According to the geological conditions of the coal seam floor, within the range of 10m to 30m below the coal seam, choose a rock layer with weak rock quality and low rock strength, which is easy to carry out floor road construction. A floor road is constructed by drilling and blasting excavation or other excavation methods, and the section of the roadway is 4m× 3m, using rectangular W steel belt anchor net support;

[0065] 2) Drilling construction of the inner layer of the floor road

[0066] Such as figure 2 with image 3 As shown in Fig. 1, a group of floor-through-layer drilling holes are constructed in floor-way 1 at intervals of ...

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Abstract

The invention discloses a liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for a low-permeable coal seam. The method comprises the following steps that (1) a bottom board passage is constructed; (2) crossing drilling construction is carried out in the bottom board passage; (3) liquid CO2 phase change cracking is carried out; (4) gas of coal seams of a coal roadway strip and a recovery area is pre-drained with crossing drill holes; (5) the extraction effect of the coal roadway strip area is detected; (6) coal roadway construction is carried out; (7) hole drilling down the seam is carried out; (8) gas of the coal seam in the recovery area is pre-drained with grid type drill holes; and (9) the extraction effect of the recovery area is detected. The method can improve the quantity of drainage of gas of underground coal mine, achieve the purpose of rapidly eliminating danger of outburst for high-gas low-permeable outburst coal seams, prevent coal and gas outburst accidents and guarantee safety production of the underground coal mine.

Description

technical field [0001] The invention relates to a gas extraction method. Background technique [0002] Mine gas is the main factor affecting the safe production of coal mines in my country. Among the deaths caused by coal mine accidents in China, gas accidents account for a large proportion, especially serious accidents. [0003] Due to the poor geological conditions of coal seams in my country and the low permeability of coal seams, the mine gas extraction rate is low and the efficiency of gas drainage is low. Therefore, it is necessary to artificially enhance the permeability of coal seams. Relevant scholars have proposed measures such as hydraulic fracturing and deep hole pre-fracturing to achieve certain results, but there are still various deficiencies in the application process. Therefore, it is urgent to propose a new coal seam permeability enhancement gas drainage method. [0004] Although the existing coal seam permeability enhancement methods have played a certain...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/261E21F7/00
Inventor 张东明白鑫尹光志王浩熊毅郑彬彬何庆兵杨玉顺杨瀚樊增瑞
Owner CHONGQING UNIV
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