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Gas drainage borehole and construction method thereof

A technology for gas drainage and construction methods, which is applied in the direction of drilling equipment and methods, drilling equipment, earthwork drilling, etc., can solve the problems of unreliable drilling quality for gas drainage, increase the anti-deformation ability, improve quality, The effect of increasing the amount of gas extraction

Active Publication Date: 2014-06-25
HUAINAN MINING IND GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The invention provides a gas drainage borehole and its construction method, which are used to solve the defect of unreliable quality of the gas drainage borehole in the prior art, and provide a high-quality gas drainage borehole

Method used

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  • Gas drainage borehole and construction method thereof
  • Gas drainage borehole and construction method thereof
  • Gas drainage borehole and construction method thereof

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] figure 1 Schematic diagram of the structure of the gas drainage borehole provided for the implementation of the present invention. Such as figure 1 As shown, the gas extraction boreholes in this embodiment include: the first borehole 1 drilled in the new strata above the first coal seam roof 13-1 coal and the bedrock section; the first co...

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Abstract

The invention provides a gas drainage borehole and a construction method thereof. The gas drainage borehole comprises a first borehole and a second borehole. The first borehole is bored in a new stratum above a first coal seam roof and a bedrock section. The second borehole is bored between the first coal seam roof and a second coal seam roof below the first coal seam roof, and the diameter of the second borehole is larger than that of the first borehole. A first sleeve is disposed in the first borehole. A second sleeve is disposed in the first sleeve and above a first position above a bedrock face, a third sleeve is disposed in the first sleeve and between the lower side of the first position and a second position above the first coal seam roof, a fourth sleeve is connectedly arranged below the third sleeve, a fifth sleeve equal to the third sleeve in diameter and wall thickness is further disposed in the fourth sleeve, and a perforated pipe is connectedly arranged below the fifth sleeve and inside the second borehole. According to the technical scheme, the quality of the gas drainage borehole can be improved effectively, and gas yield is increased.

Description

technical field [0001] The invention relates to the technical field of mine drainage, in particular to a gas drainage drilling and a construction method thereof. Background technique [0002] The gas extraction borehole in the existing coal mine is an important facility for extracting the gas in the underground coal seam of the coal mine. Therefore, the quality of gas drainage boreholes directly determines the effect of coal seam gas drainage. Therefore, the structure of gas drainage borehole is very important. [0003] By tracking the bottom-hole video monitoring, after coal mining, due to the subsidence and displacement of the overlying strata after the coal seam is mined, the working pipe in the gas drainage borehole is deformed or the gas drainage channel in the gas drainage borehole is blocked. Blockage, resulting in the failure of normal gas extraction. Therefore the quality of existing gas drainage borehole is not reliable. Contents of the invention [0004] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E21B7/20
Inventor 程志忠赵俊峰陈功胜丁同福汪金业汪峰荣周永引李友俊贾少平陈晓雷
Owner HUAINAN MINING IND GRP
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