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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Therefore, the existing gas drainage methods al

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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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[0061] The present invention will be further explained below in conjunction with the drawings and embodiments:

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

[0063] 1) Construction floor road

[0064] According to the geological conditions of the coal seam floor, choose a rock layer with weaker rock quality and low rock strength within 10m-30m below the coal seam, which is easy for floor road construction. Use drilling blasting or other tunneling methods to construct a floor road. The roadway section is 4m× 3m, using rectangular W steel belt anchor net support method;

[0065] 2) Drilling construction through the floor inside the floor

[0066] Such as figure 2 with image 3 As shown, a drilling rig is used to construct a set of floor road penetration holes every 8 meters in floor road 1, including floor road penetration gas drainage boreholes 2 and...

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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...

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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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