Drilling method for extracting coalbed methane of adjacent closed goaf groups

A goaf and coalbed methane technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of small extraction volume, small influence radius, and short extraction period, so as to reduce the drilling footage , Improve the drainage life and improve the production capacity of goaf wells

Pending Publication Date: 2020-12-29
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for extracting coalbed methane from adjacent closed goafs in order to solve the problems of small influence radius, small extraction volume, and short extraction period in the existing coalbed methane extraction method in closed goafs. drilling method

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  • Drilling method for extracting coalbed methane of adjacent closed goaf groups
  • Drilling method for extracting coalbed methane of adjacent closed goaf groups

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[0016] In order to enable those skilled in the art to better understand the present invention, the present invention will be further clearly and completely described below in conjunction with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0017] The invention provides a drilling method for extracting coalbed methane from adjacent closed goaf groups, especially the closed goaf groups formed by adopting the trending longwall coal mining process and having a residual coal rate of not less than 30%. The trend of strong natural deflection and hole deviation is obvious, and the drilling trajectory of this method is a single-hole bottom directional hole in the form of a straight line-curve.

[0018] Specifically include the following steps:

[0019] S1. Determine the height of the fissure z...

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Abstract

The invention relates to a drilling method for extracting coalbed methane of adjacent closed goaf groups. The problems that in an existing method for extracting coalbed methane of closed goafs, the influence radius is small, the extraction amount is small, and the extraction term is short are solved. According to the method, a well body track is a single-hole bottom directional hole in a linear-curve form. The method specifically comprises the steps that the intersection of the tendency central axis direction of the goaf groups and the trend central axis of an edge goaf is selected as a well position, when drilling is carried out to the position of a goaf top plate fissure zone by adopting a conventional drilling process technology, deflecting is started in the tendency axis direction of the goaf groups, and the target area of the final hole layer is within the goaf caving zone range. According to the method, the drilling footage is reasonably reduced, the effective communication areaof goafs is fully disclosed, and the method has great popularization significance in improving the productivity of mined-out wells and prolonging the extraction term.

Description

technical field [0001] The invention relates to the technical field of coalbed methane, in particular to a drilling method for extracting coalbed methane from adjacent closed goaf groups. Background technique [0002] At present, mining areas all over the country have a large number of abandoned mines, and the area of ​​abandoned mines in some mining areas can reach several thousand square kilometers. There is a large amount of coalbed methane in the goaf of abandoned mines, but the conventional method is adopted for the development of goaf coalbed methane at present, that is, one goaf vertical shaft is arranged in a closed goaf, and the impact radius of this method is relatively limited. , and the amount of resources in a single closed goaf is limited, which seriously restricts the drainage life of the goaf vertical well. Contents of the invention [0003] The purpose of the present invention is to provide a method for extracting coalbed methane from adjacent closed goaf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/30
CPCE21B43/006E21B43/30
Inventor 王争鲁博武玺周显俊于振锋李阳李超毕利丽崔宇翔
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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