Method for exploiting two layers of coal seam gas

A technology for coalbed methane and coal mines, which is applied in the field of mining two layers of coalbed methane, and can solve the problem that the simultaneous mining of upper and lower coalbed methane cannot be realized.

Active Publication Date: 2017-06-20
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 exploiting two layers of coalbed methane, so as to solve the problem in

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  • Method for exploiting two layers of coal seam gas

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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 exploiting two layers of coal seam gas. The method comprises the following steps that a near vertical well and a far vertical well are drilled in the distance at a preset distance with a main roadway; a ground horizontal well is drilled, directional angle building is conducted on the ground horizontal well to a lower coal seam, a horizontal section of the ground horizontal well penetrates through the far vertical well firstly and then penetrates through the near vertical well in the lower coal seam; directional angle building is conducted on the ground horizontal well to an upper coal seam, the horizontal section of the ground horizontal well penetrates through the far vertical well firstly and then penetrates through the near vertical well in the upper coal seam; an adit horizontal well is drilled along the upper coal seam in the main roadway; two layers of coal mine seam sections of the near vertical well and the far vertical well are subjected to broaching, and the ground horizontal well is made to communicate with the adit horizontal well and the vertical wells; and coal gas exploiting is conducted through the near vertical well and/or the far vertical well and/or the ground horizontal well and/or the adit horizontal well. According to the technical scheme, the problem that in the prior art, simultaneous exploiting of the upper and lower coal seam gas cannot be conducted on the coal seam gas in the two coal mine seams which do not communicate mutually is solved.

Description

technical field [0001] The invention relates to the technical field of coal bed gas exploitation, in particular to a method for mining two-layer coal bed gas. 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. Especially, in the geological characteristics with two layers of coal seams, the above-mentioned mining method cannot realize simultaneous mining of upper and lower coalbed methane. Contents of the invention [0003] The main purpose of the present invention is to provide a method for exploiting two layers of coalbed methane, so as to solve the problem in the prior art that the coalbed methane in two layers of unconnected coal seams cannot be exploited simultaneously from the upper and lowe...

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Application Information

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IPC IPC(8): E21B43/14E21B43/30
CPCE21B43/14E21B43/305
Inventor 向军文
Owner CHINA SHENHUA ENERGY CO LTD
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