Coal and coal bed gas continuous development method based on ground directional horizontal holes

A coalbed methane and horizontal hole technology, which is applied in the fields of fluid extraction, earthwork drilling, gas discharge, etc., can solve the problems of low extraction volume, low extraction efficiency, and single drilling horizon.

Active Publication Date: 2021-06-01
CCTEG COAL MINING RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the drilling layer is single, the drainage volume is small, and the drainage efficiency is low

Method used

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  • Coal and coal bed gas continuous development method based on ground directional horizontal holes
  • Coal and coal bed gas continuous development method based on ground directional horizontal holes
  • Coal and coal bed gas continuous development method based on ground directional horizontal holes

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Embodiment Construction

[0045] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0046] The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The embodiments and simplified descriptions of the invention do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be co...

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Abstract

The embodiment of the invention provides a coal and coal bed gas continuous development method based on ground directional horizontal holes. The method comprises the steps that the coal bed gas content is measured to determine a close-range protection layer, a long-range protection layer and a protected layer; the arrangement layer positions of all layers of horizontal branch holes in the protected layer, surrounding rock between the protected layer and the close-range protection layer and surrounding rock between the protected layer and the long-range protection layer are determined; all layers of horizontal branch holes in the protected layer, the surrounding rock between the protected layer and the close-range protection layer and the surrounding rock between the protected layer and the long-range protection layer are drilled; and through all layers of horizontal branch holes, coal bed gas in the protected layer, the surrounding rock between the protected layer and the close-range protection layer and the surrounding rock between the protected layer and the long-range protection layer is pre-extracted. According to the method, the multi-layer-position and regional arrangement form is adopted for the directional horizontal holes, and the coal bed gas can be extracted in an all-around manner. Meanwhile, the extraction amount of the method is large, and the extraction efficiency is high.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal and coal bed gas continuous development method based on directional horizontal holes on the ground. Background technique [0002] There is a large amount of coalbed methane in coal seams and their surrounding rocks, the main component of which is CH 4 (commonly known as "gas"). For high gassy coal seams, in accordance with the requirements of the "Regulations on the Prevention and Control of Coal and Gas Outbursts", it is necessary to carry out pre-mining gas extraction, gas extraction during mining and goaf extraction of gas in the coal seam and its surrounding rocks until the residual gas in the coal seam is exhausted. The gas content is less than 8m 3 / t or the residual gas pressure of the coal seam is less than 0.74Mpa, it is considered that the drainage reaches the standard. [0003] Directional drilling technology is widely used in the field of oil and gas exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B43/30
CPCE21F7/00E21B43/26E21B43/305
Inventor 樊振丽胡炳南张玉军尹希文孙林王志晓赵秋阳于秋鸽
Owner CCTEG COAL MINING RES INST
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