Method for coal bed gas exploitation of full working face through down-hole system

A coalbed methane and working face technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problem that the whole working face cannot be pumped and drained

Inactive Publication Date: 2017-05-17
CHINA SHENHUA ENERGY CO LTD +1
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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for mining coalbed methane in the whole working face using the downhole system

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  • Method for coal bed gas exploitation of full working face through down-hole system

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[0019] 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. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0020] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0021] For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encomp...

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Abstract

The invention provides a method for coal bed gas exploitation of a full working face through a down-hole system. The method comprises the following steps that a plurality of vertical wells are dug in the positions, a preset distance away from a main roadway along the full working face, on the ground, and all the vertical wells penetrate through a coal mine layer; horizontal wells are dug, the horizontal well sections of the horizontal wells are located in the coal mine layer, and the left-right deviation distances, relative to the vertical wells, of the horizontal well sections are between 0.3 m and 0.6 m; after the ground horizontal wells and the vertical wells are all completed, a down-hole horizontal well is dug in the main roadway along the coal mine layer, and the left-right deviation distance, relative to the vertical well nearest the main roadway, of the down-hole horizontal well is between 0.3 m and 0.6 m; a control pipe line is mounted on a well mouth of the down-hole horizontal well; cavity expansion is conducted on coal mine layer sections allowing the vertical wells to penetrate through reamer bits, and all the ground horizontal wells and the down-hole horizontal well communicate with all the vertical wells; and coal gas exploitation of the down-hole full working face is conducted through the control pipe line mounted on the well mouth of the down-hole horizontal well. According to the method for coal bed gas exploitation of the full working face through the down-hole system, the problem that pumping and drainage of the full working face cannot be achieved in the exploitation process of coal bed gas is solved.

Description

technical field [0001] The invention relates to the technical field of coal-bed methane exploitation, in particular to a method for exploiting coal-bed methane in the whole working face by using an underground system. Background technique [0002] At present, the methods used for coalbed methane extraction in coal mines are one is to drill underground wells for underground extraction, and the other is to drill wells on the ground to implement surface extraction. Neither of these two methods can achieve the extraction of the entire working face. Contents of the invention [0003] The main purpose of the present invention is to provide a method for exploiting coalbed methane in the whole working face using the downhole system, so as to solve the problem in the prior art that the extraction of coalbed methane from the whole working face cannot be realized during the mining process. [0004] In order to achieve the above object, the present invention provides a method for expl...

Claims

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Application Information

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IPC IPC(8): E21B43/00
CPCE21B43/006
Inventor 向军文
Owner CHINA SHENHUA ENERGY CO LTD
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