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Gas explosion coal seam permeability increasing extraction method in borehole in later period of induction extraction

A drilling and drainage technology, which is applied in the direction of gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of limited penetration range, uneven and discontinuous detonation gas concentration distribution area, and achieve high transmission efficiency of explosion wave , Increase the development of coal fractures and the uniform distribution of gas concentration

Active Publication Date: 2016-09-07
CHINA UNIV OF MINING & TECH
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Problems solved by technology

At present, the main anti-permeability measures for a single coal seam in coal mines include two measures: hydraulic anti-permeability and blasting. However, these two anti-permeability measures have certain limitations: hydraulic anti-permeability measures such as hydraulic fracturing, hydraulic slotting and Hydraulic punching in soft and low-permeability coal seams can easily induce accidents in holes such as collapsed holes and spray holes, blocking gas flow channels, and limited by the surface tension of water, the penetration range is limited
A Chinese Invention Patent published on January 28, 2015 has a publication number of CN104314605A "A Method for Intensified Drainage of Coal by Gas Explosion Fracture in Boreholes" and a Chinese Invention Patent published on December 24, 2014. No. CN104234739A "a kind of in-drilling gas explosion fracturing coal enhanced drainage method" all proposes a kind of active injection of air to the drilling, so that the gas concentration in the hole is reduced to the optimum explosion concentration range, and then detonates the gas in the hole. The method of gas fracturing, the above method relies on active gas injection to dilute the gas, which has the problem of uneven distribution of gas concentration in the hole, and the distribution area of ​​detonable gas concentration in the hole is uneven and discontinuous, which will easily lead to ignition failure and internal combustion in the hole The explosion range is limited, and it does not involve the safety protection problem of coal spontaneous combustion in the hole after the explosion

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  • Gas explosion coal seam permeability increasing extraction method in borehole in later period of induction extraction

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Embodiment

[0028] a. Insert the 20m-long gas extraction pipe 7 into a borehole with a diameter of 94mm and a depth of 100m, then seal the borehole with pressurized cement grouting, install the gas concentration monitoring device 2, carbon monoxide monitoring device 3, temperature The monitoring device 4 is set on the pipeline of the underground negative pressure drainage main pipeline 1, and the spark generator 6 is set on the pipeline of the gas drainage pipe 7. By what means are the spark generator 6 connected to the gas concentration monitoring device 2 and the carbon monoxide monitoring device? Device 3 and temperature monitoring device 4 are isolated and separated by three-way ball valve 5;

[0029] b. When the gas concentration monitoring device 2 monitors that the gas concentration in the gas extraction pipe 7 is 9.3%, close the three-way ball valve 5, and connect the power to the spark generator 6 to cause the gas in the borehole to detonate;

[0030] c. After the gas explosion i...

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Abstract

Provided is a gas explosion coal seam permeability increasing extraction method in a borehole in the later period of induction extraction. The method comprises: inserting a gas extraction pipe (7) into a borehole; a down-hole negative pressure extraction main pipeline (1) and the pipeline of a three-way ball valve (5) being provided with a gas density monitoring device (2), a carbon monoxide monitoring device (3), and a temperature monitoring device (4), a gas extraction pipe being provided with a spark generator (6), when the gas density monitoring device monitors that gas density in the gas extraction pipe is in the range of 9%-10%, the spark generator switching on to make gas in the borehole blast; extracting gas in the borehole; when carbon monoxide density in the extracted gas is monitored to exceed a warming value or the temperature of the extracted gas exceeds the warming value, injecting water into the borehole to prevent coal spontaneous combustion. The method uses the natural attenuation characteristics of the density of a gas extraction borehole to induce repeated detonation, cracks of coal mass on the periphery of a hole wall are developed, and coal seam gas permeability is improved continuously. The method is suitable to be used for a high-gas low permeability coal seam.

Description

technical field [0001] The invention relates to a coal seam anti-permeability drainage method, in particular to a gas detonation coal seam anti-permeability extraction method in a bore hole in the later stage of induced drainage, and belongs to the technical field of gas anti-permeability extraction. Background technique [0002] The gas permeability of my country's coal seams is 2-3 orders of magnitude lower than that of the United States and Australia, and coal seam permeability enhancement is the main way to increase gas extraction. At present, the main anti-permeability measures for a single coal seam in coal mines include two measures: hydraulic anti-permeability and blasting. However, these two anti-permeability measures have certain limitations: hydraulic anti-permeability measures such as hydraulic fracturing, hydraulic slotting and Hydraulic punching in soft and low-permeability coal seams can easily induce accidents in holes such as collapse holes and injection hol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21F5/00
CPCE21F5/00E21F7/00
Inventor 周福宝刘春满忠毅
Owner CHINA UNIV OF MINING & TECH
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