System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf

A surface drilling and coalbed methane technology, which is applied to earthwork drilling, mining fluids, boreholes/well components, etc., can solve problems such as high accident rate, difficult construction, and low porosity rate, so as to save economic costs, Improve rock breaking efficiency and fast crushing speed

Active Publication Date: 2015-12-02
TAIYUAN UNIV OF TECH
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Problems solved by technology

At present, the gas in the old goaf is mainly drilled from the ground to the upper fissure zone of the goaf to extract the gas in the old goaf. This method is difficult to constr

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  • System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf

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Embodiment

[0029] Such as figure 1 As shown, the present invention provides a system for improving the extraction volume of coalbed methane in the old goaf area of ​​ground drilling, including extraction drilling 1, surface extraction station 11, valve II 7, extraction pipe 4, injection pipe 5, pressure Table 23, valve Ⅰ 8, tee pipe Ⅰ 20, heating device 22, liquid booster pump 17, liquid CO 2 Storage tank 16, refrigeration device 15, valve III 14, gas booster pump 9, valve IV 13, tee pipe II 21, CO 2 The gas storage tank 10, the extraction well 1 leads to the bottom of the coal pillar 3, the extraction pipe 4 and the injection pipe 5 are sent to the bottom of the coal pillar 3 through the extraction well 1; the sealing section I (6) is flush with the ground, The sealing section II (19) is located 0.5~2m above the coal pillar; the injection pipe 5 above the ground is connected to the pressure gauge 23, the valve I8, and the tee pipe I20, and the other end of the tee pipe I20 is connecte...

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Abstract

The invention discloses a system and a method for increasing drainage quantity of coal bed gas of a ground well drainage goaf and belongs to the technical field of coal bed gas drainage. The method includes: constructing a drainage well between adjacent goaf holes, sequentially sending a drainage pipe and a flow injection pipe in, and arranging sealing sections I and II; opening a valve I and a valve III, injecting 30-60 MPa of supercritical CO2 into the flow injection pipe until pressure indicating number declines suddenly; opening a valve II to enable a ground drainage station to drain the coal bed gas, recording initial gas flow, repeating replacement of coal bed gas with CO2 when coal bed gas flow declines 30% of the initial gas flow again, and stopping coal bed gas drainage until the coal bed gas flow declines to 16% of the initial gas flow finally. By the system and the method, concentration of drained coal bed gas is increased effectively, and cost for separation and purification is lowered; supercritical CO2 jet flow is adopted to break coal columns, so that threshold pressure is low, breaking speed is high, no pollution is caused to a coal bed gas reservoir, and rock breaking efficiency can be improved substantially.

Description

technical field [0001] The invention relates to a system and a method for improving the coalbed methane extraction volume in the old goaf area of ​​ground drilling and drainage, and belongs to the technical field of coalbed methane extraction. Background technique [0002] At present, my country mainly adopts surface drilling to extract residual coalbed methane in the old empty area, and the extraction effect is not ideal. When the production of coalbed methane decreases, surface drilling is often abandoned directly. A large amount of underground coalbed methane is fully extracted and utilized, and a large amount of available coalbed methane is still adsorbed in a large amount of unmined coal in the underground. It will take a certain time for this part of coalbed methane to desorb from the adsorption state to the free state. At this time, if the ground drilling is abandoned, a large amount of coalbed methane will be abandoned. The utilization of ground still requires ground...

Claims

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Application Information

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IPC IPC(8): E21B43/00
Inventor 冯国瑞李振张钰亭胡胜勇刘国艳郭峰郭育霞戚庭野郭军任鸿瑞康立勋
Owner TAIYUAN UNIV OF TECH
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