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Waste goaf coalbed methane ultimate exhausting and mining method

A goaf and coalbed methane technology, which is applied in the fields of fluid extraction, earthwork drilling, climate sustainability, etc., can solve the problems of inability to extract coalbed methane and the extraction effect is not ideal, so as to shorten the extraction time, Mitigating the effect of the greenhouse effect

Inactive Publication Date: 2017-05-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

At present, ground drilling is one of the main methods for extracting coalbed methane from abandoned gobs, but this method cannot completely extract coalbed methane, and the extraction effect is not ideal, so there is an urgent need for a method that can maximize the extraction Method of Abandoning Coalbed Gas in Goaf

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  • Waste goaf coalbed methane ultimate exhausting and mining method
  • Waste goaf coalbed methane ultimate exhausting and mining method

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the example of the present invention will be further described:

[0013] A coalbed methane limit extraction method in an abandoned goaf, comprising the following steps:

[0014] a. Construct a ground borehole (2) at intervals of 100-150m from the ground (1) along the middle of the goaf mining direction to the bottom of the goaf (3);

[0015] b. Insert a gas injection pipe (5) with a first valve (4) at the upper end into each ground borehole (2) to the bottom of the goaf (3), and then insert into each ground borehole (2) Insert a drainage pipe (7) with a second valve (6) on the upper part to the upper boundary (8) of the goaf, and seal the hole of the ground borehole (2) with a sealing material (9);

[0016] c. Open the first valve (4) and the second valve (6), inject carbon dioxide into the goaf (10) through the gas injection pipe (5), and at the same time drain the gob (10) through the extraction pipe (7) coalbed methan...

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Abstract

The invention provides a waste goaf coalbed methane ultimate exhausting and mining method. The method comprises the steps of constructing a ground drill hole every 100-150 m along the middle of the mine mining direction of the goaf until reaching the bottom of a goaf, and inserting a gas injection pipe and an exhausting and mining pipe into each ground drill hole in sequence, wherein the bottom of the gas injection pipe is located at the bottom of the goaf, and the bottom of the exhausting and mining pipe is located at the upper boundary of the goaf. Carbon dioxide is injected into the goaf through the gas injection pipe, and because the density of carbon dioxide is bigger than that of coalbed methane, coalbed methane is expelled to the upper boundary of the goaf to be exhausted through the exhausting and mining pipe. According to the waste goaf coalbed methane ultimate exhausting and mining method, coalbed methane in the waste goaf can be exhausted and mined to the greatest extent, and greenhouse gas carbon dioxide can be encapsulated.

Description

technical field [0001] The invention relates to a coalbed methane limit extraction method in an abandoned goaf, and belongs to the technical field of residual coalbed methane extraction in a coal mine goaf. Background technique [0002] The long-term large-scale and high-intensity coal mining in my country has produced a large number of abandoned goafs, and a large amount of coalbed methane remains in the abandoned goafs. Coalbed methane is a kind of clean energy, so the coalbed methane in the abandoned goafs is pumped Adoption and utilization are critical. At present, ground drilling is one of the main methods for extracting coalbed methane from abandoned gobs, but this method cannot completely extract coalbed methane, and the extraction effect is not ideal, so there is an urgent need for a method that can maximize the extraction A method for discarding goaf coalbed methane. Contents of the invention [0003] The object of the present invention is to provide a method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/16B65G5/00
CPCB65G5/00E21B43/006E21B43/164Y02C20/40Y02P90/70
Inventor 胡胜勇赵静田甜冯国瑞张奡王进缪煦扬肖杰任梦琦邵和
Owner TAIYUAN UNIV OF TECH
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