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A ground gas extraction method in multiple gobs without coal pillars

A technology for gas drainage and goaf extraction, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., and can solve problems such as complex construction of gas extraction methods

Active Publication Date: 2021-12-21
华能煤炭技术研究有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for gas extraction on the ground with multiple goafs without coal pillars, so as to solve the technical problem of complex construction in the existing method of gas extraction on the ground with multiple goafs

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  • A ground gas extraction method in multiple gobs without coal pillars
  • A ground gas extraction method in multiple gobs without coal pillars
  • A ground gas extraction method in multiple gobs without coal pillars

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Embodiment Construction

[0031] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] figure 1 It is a schematic cross-sectional view of the first stage when gas drainage is carried out by adopting the ground gas drainage method in multiple goafs without coal pillars provided in this embodiment, figure 2 It is a top view schematic diagram of the first stage of gas drainage using the non-coal pillar multi-goaf ground gas drainage method provided in this embodiment, image 3 It is a schematic cross-sectional view of the second stage when gas drainage is carried out by adopting the non-coal pillar multi-goaf ground gas drainage method provided in this embodiment, Fi...

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Abstract

The invention provides a method for ground gas extraction in multiple goafs without coal pillars, relates to the technical field of gas drainage, and is designed to solve the problem of complex construction in the existing method for ground gas extraction in multiple goafs. The method for ground gas drainage in multiple goafs without coal pillars includes the following steps: constructing gas drainage boreholes on the ground, the ground construction position of the gas drainage boreholes is located above the goaf of the first mining face, and the gas drainage drill The end of the hole extends into the fissure zone of the first mining face for a set distance, and the gas drainage borehole only exists in the fissure zone of the first mining face; a gas drainage pipe is set in the gas drainage borehole, and the gas drainage pipe is connected to It is used in the ground gas drainage device; it is used to recover the continuous working face. The ground gas drainage method provided by the invention has simple construction and can realize gas drainage in multiple goafs without coal pillars.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a method for ground gas drainage in multi-goaf areas without coal pillars. Background technique [0002] Pillarless mining is a mining technology that does not leave coal pillars in the roadway protection process and maintains the roadway in other ways. Its advantages are high recovery rate, can reduce rock burst, low driving rate, and low roadway maintenance costs , so it has been widely used. However, at present, the methods for ground gas extraction in multi-mined-out goafs are all aimed at the situation with coal pillars. The specific method is: take measures to drain the gas generated in the fracture fields above the adjacent goafs. , and then gather the methane gas extracted separately. This ground gas extraction method is complex in construction and can only realize gas extraction in goafs with many coal pillars. Contents of the invention [0003] The purpose of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/30E21B47/00
CPCE21B43/168E21B43/006E21B43/30E21B47/00
Inventor 高健勋栗磊马新根李永元张倍宁高利晶孙福龙徐浩胡勇于赟
Owner 华能煤炭技术研究有限公司
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