Method for increasing gas extraction rate by permeability increasing of single thick coal seam

A technology for gas drainage and thick coal seam, which is applied in the fields of gas emission, mining equipment, earthwork drilling, etc. It can solve the problems of poor drainage effect, difficulty in controlling the direction of fracturing, and general gas drainage rate effect, etc. A wide range of effects
CN102678166AActive Publication Date: 2012-09-19CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Publication Date
2012-09-19

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Abstract

Disclosed is a method for increasing gas extraction rate by permeability increasing of single thick coal seam. During a tunneling process of coal seam working face, gas extraction holes are drilled along coal seams and hole protecting tubes are inserted into the gas extraction holes after drilling and sealed so as to perform gas extraction. When tunneling length of a tunnel is less than 50m, a twist drill is used to drill on the bottom of the coal seam along an inclination at intervals of 0.3-0.5m of coal pillars, and drilling holes which are 1.0-1.5m in width and 0.1-0.2 time as high as the coal seam are formed. After the drilling holes are formed, curved sink from bottom to top occurs on the coal, a large quantity of gaps are generated, permeability coefficient of the coal is increased by more than 120 times on average, gas extraction flow is increased by more than 10 times on average, and average gas extraction concentration is larger than 55%. By the method, pressure relief of the single thick coal seam with high gas content and low permeability is achieved, permeability increasing range is wide, permeability increasing effect is fine, and the gas extraction rate is increased by 60%. In addition, the method is widely applicable.
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Description

technical field

[0001] The invention relates to a method for increasing the gas extraction rate, in particular to a method for enhancing the gas extraction rate in a single thick coal seam area, which is suitable for a single thick coal seam with high gas and low permeability. Background technique

[0002] According to the "Eleventh Five-Year Plan" for the development and utilization of coalbed methane (coal mine gas), it is known that the outburst coal seam area in Yinggong Coalfield, the outburst coal seam area in Dengfeng Coalfield, the outburst coal seam area in Xinmi Coalfield, the outburst coal seam area in Jiaozuo mining area, and the outburst coal seam area in Jincheng mining area , Qinshui Coalfield coal seam area, Anyang-Hebi mining area outburst coal seam area, Fengfeng-Handan mining area outburst coal seam area, Hancheng mining area outburst coal seam area, Shitanjing-Shizuishan coal seam outburst area, Tonghua mining area outburst coal seam area, etc. Mining is ...

Claims

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