A gas control method for high gas coal seam and large mining height working face
A technology of working face and large mining height, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems that the gas control technology cannot be applied, and the mining intensity of the large mining height working face is high, so as to improve the effect The effect of improving efficiency, improving effectiveness, and improving safety
Inactive Publication Date: 2018-07-10
HENAN POLYTECHNIC UNIV
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Problems solved by technology
Although there are many methods for gas drainage in gobs at present, many of the original gas control technologies for thin and middle coal seams cannot be applied due to the high mining intensity of working faces with large mining heights
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] see figure 1 , the present invention provides a technical solution: a gas control method for high-gas coal seams with large mining heights, characterized in that it includes the following steps:
[0025] (1) Low-level borehole drainage: During the excavation process of the current working face 3, low-level boreholes are arranged in the return airway to extract the gas during the initial mining period of the fully mechanized mining face with a large mini...
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The invention discloses a high gas coal seam large height mining face gas control method comprising the following steps: 1, low drilling gas drainage; 2, high drilling gas drainage; 3, horizontal bedding drilling gas drainage; 4, upper corner drilling gas drainage; 5, setting bottom plate interception holes so as to extract and intercept lower adjacent coal seam pressure relief gas; 6, using all drill holes from step 1-5 to commonly carry out gas drainage; 7, along with tunneling of the coal seam, the large height mining face is fully employed, thus carry out full and efficient gas drainage. Expansion holes and negative pressure holes are arranged, blast explosives are added, thus well improving coal seam permeability, improving gas drainage effect, enhancing gas control completeness, and improving coal seam exploitation safety. The method employs large mining height features, and high and low drill holes are arranged with different inclination angle, thus improving gas drainage efficiency and effect.
Description
technical field [0001] The invention belongs to the technical field of gas drainage, and in particular relates to a gas control method for a high-gas coal seam working face with a large mining height. Background technique [0002] Large mining height fully mechanized caving mining technology is a new mining technology in coal mining methods, and it is a new development of thick and extra-thick coal seam mining methods. It has the advantages of high production, high efficiency, low excavation rate, low cost, and good economic benefits. However, with the increase of mining intensity in the working face and the shift of mining to deep areas, the coal seam gas storage conditions in low-gas mines will change greatly. Compared with the common fully mechanized caving mining under the same coal seam conditions, under the condition of large mining height fully mechanized caving mining, with the increase of the coal cutting height of the working face, the top coal caving height decrea...
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IPC IPC(8): E21B43/263
CPCE21B43/263
Inventor 吕闰生李冰刘高峰任建刚袁军伟
Owner HENAN POLYTECHNIC UNIV