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Directional long-hole group for gas extraction and construction method of directional long-hole

A technology for gas extraction and long drilling, which is applied in drilling equipment and methods, directional drilling, gas discharge, etc., can solve problems such as high cost and poor effect, and achieve high precision, high efficiency, and high drilling construction efficiency. and pore-forming efficiency

Inactive Publication Date: 2018-11-27
HUAINAN MINING IND GRP
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the gas drainage in the goaf of the existing working face has the problem of high cost or poor effect

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  • Directional long-hole group for gas extraction and construction method of directional long-hole
  • Directional long-hole group for gas extraction and construction method of directional long-hole
  • Directional long-hole group for gas extraction and construction method of directional long-hole

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Embodiment Construction

[0022] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0023] The general situation of the working face in this embodiment: the strike length is 1937 meters, the inclination length is 260 meters, the roadway is supported by anchor beam net, and the end face is rectangular. The average coal thickness of the coal seam is 4.10 meters, and the normal dip angle of the coal seam is 10-40. Direct top: about 4.19 meters of mudstone, fine sandstone, sandy mudstone; old top: about 3.25 meters of medium sandstone; direct bottom: about 3.6 meters of sandy mudstone, mudstone; old bottom: about 4.65 meters of sandy mudstone.

[0024] like figure 1 Shown is a gas drainage directional long borehole group provided in this embodiment, which includes a plurality of directional long boreholes 1 that are staggered...

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Abstract

The invention discloses a gas extraction directional long drill hole group, comprising a plurality of staggered directional long drill holes, wherein the orifices of the directional long drill holes are located at the same height, and the orifices are located on the bad stratum at the top plate of the coal seam; the orifices of the directional long drill holes are located at the same height. Eachdefinite long hole comprises a first hole section and a second hole section, wherein the first hole section extends from an orifice to a good formation to a junction of a bad formation and a good formation, and the first hole section and a roof are at an included angle, and the angle range is 0-90 degrees; The second hole section is connected with the first hole section and is located in a good formation, and the second hole section is arranged in parallel with the top plate. The invention also discloses a construction method of a directional long drill hole. The invention has the advantages of high hole forming efficiency, fast construction speed, good gas drainage effect and cost saving.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a gas drainage directional long drilling group and a construction method for the directional long drilling. Background technique [0002] In coal mine production, the main methods to control the gas in the goaf of the working face are high-level pumping roadway and conventional roof drilling. The excavation of high pumping roadway has a large workload, high labor intensity, low production efficiency and high comprehensive cost. Conventional high-level drilling requires a high-level drilling site, the drilling trajectory is uncontrollable, the accuracy is poor, the depth of the hole is shallow and the impact range is small, and the drainage effect is not good. Contents of the invention [0003] The technical problem to be solved by the present invention is that the gas drainage in the goaf of the existing working face has the problems of high cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21F7/00
CPCE21B7/046E21F7/00
Inventor 童碧赵俊峰刘德贵祁军朱明明冯首翔娄心亮
Owner HUAINAN MINING IND GRP
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