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Method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief

A technology of coalbed methane and high-pressure water pump, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of difficult coalbed methane extraction, low coal seam permeability, high gas content, etc., and achieve increased pressure relief Range and radius of influence, the effect of increasing permeability and enhancing coal hardness

Active Publication Date: 2013-02-20
ZHENGZHOU UNIV
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Problems solved by technology

Due to the complex geological conditions of coal seams in my country, high gas content, and low permeability of coal seams, there are great difficulties in coal seam gas extraction. method, but each has its specific adaptation conditions

Method used

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  • Method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief
  • Method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief
  • Method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with an embodiment (accompanying drawing):

[0022] Such as figure 1 , figure 2 , image 3 As shown, the method for extracting coalbed methane under high-pressure hydraulic pressure relief in regional wells of the present invention, the specific implementation steps are as follows:

[0023] (1) First, in the floor rock roadway 2 of the coal seam 1 in the outburst prevention area in front of the coal mining or excavation working face, a plurality of drilling sites 3 are arranged along the direction of roadway excavation, and one or more drilling holes are arranged in each drilling site 3 Keep an appropriate distance between the holes;

[0024] (2) Then, adopt the drilling equipment matched with the coal seam 1 hardness to carry out the ordinary drilling operation of small aperture to the drilling hole position;

[0025] (3) After the drill hole 4 enters the coal seam design depth, the drill is retr...

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Abstract

The invention discloses a method for mining coalbed methane through regional underground high-pressure hydraulic drilling and pressure relief, which comprises the following steps: putting a jet device, a filtering device and a drill stem connected with the filtering device into a drill hole (4); starting a high-pressure pump; carrying out rotating impact drilling on the wall of the drill hole (4) of a coalbed (1) by using the jet device so as to form a pressure relief space; and after the drilling operation meets the design requirements, carrying out coalbed methane drainage operation on the coalbed (1) subjected to drilling according to the conventional method, and then, emitting the obtained coalbed methane by a coalbed drainage pipe (7). A coal-water mixture (8) produced in the process of drilling operation (13) is fed into a swirler (10) so as to realize the separation of coal and water, and the obtained liquid supernatant (11) is directly recycled in the drilling operation (13). By using the method disclosed by the invention, the number of drill holes (3) can be greatly reduced, the pressure relief space (6) of the protruded coalbed (1) can be expanded, and the coalbed methane drainage efficiency can be improved; and meanwhile, the injection of high pressure water can effectively suppress dust, thereby reducing the risk of the protruded coalbed and improving the underground operating environment.

Description

technical field [0001] The invention relates to a method for exploiting coalbed methane under high-pressure hydraulic hole digging in an underground mine for pressure relief, and is especially suitable for exploiting coalbed methane in a coalbed in a region with high coalbed methane and low air permeability. Background technique [0002] Coal seams contain a large amount of coalbed methane, also known as gas, which is not only a valuable resource, but also an important part of the coal and gas outburst potential in underground coal mining. Its main component is methane. More than 95% of the coal mines in my country are mined underground, and a large part of them have large mining depths, high coal-bed methane content, high pressure of coal-bed methane, low coal-bed gas permeability, large amount of coal-bed methane released during the mining process, and fast release speed. With the extension of the coal seam mining to the deep part, the outburst risk of the coal seam in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/40E21B43/30
Inventor 冯立杰姜光杰陈党义李朝辉王金凤翟雪琪刘振锋邓珺邓波余华杰钟华珂张志强刘鹏周宗恒
Owner ZHENGZHOU UNIV
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