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Solvent extraction, wetting inversion, and impulse fracturing triune coal permeability-improvement method

A three-in-one, pulsating pressure technology, applied in the direction of mining fluid, earthwork drilling, gas discharge, etc., can solve the problems of limiting anti-reflection effect, unfavorable safety management, drilling technology plugging and other problems, and achieves a simple and efficient method. Increases the effect of the cracking effect

Inactive Publication Date: 2018-07-10
CHINA UNIV OF MINING & TECH
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Problems solved by technology

These measures have achieved certain results in the work of coal seam permeability enhancement, but there are also great limitations. For example, drilling techniques such as drilling slots for pressure relief are prone to plugging problems, and blasting techniques such as loosening blasting require the use of explosives. Conducive to underground safety management, hydraulic fracturing and other hydraulic technologies are prone to water locking effect, which will limit the anti-permeability effect

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  • Solvent extraction, wetting inversion, and impulse fracturing triune coal permeability-improvement method

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Embodiment Construction

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] figure 1 A structural schematic diagram of a preferred embodiment of the present invention is shown. In the figure, a three-in-one coal permeability enhancement method of solvent extraction, wet reversal, and pulsation fracturing, the specific steps are as follows:

[0020] Firstly, construct a borehole 2 in the coal seam 1, and insta...

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Abstract

The invention provides a solvent extraction, wetting inversion, and impulse fracturing triune coal permeability-improvement method. According to the method, gas extraction pipes and grouting pipes aremounted in constructed drilled holes, the grouting pipes are externally connected with impulse water injecting pumps and frequency-conversion motors, and the externally-connected impulse water injecting pumps are further utilized to mix extraction solvents, wetting inversion agents and water according to a certain proportion, so that an extraction inversion solvent is formed and injected into thedrilled holes for coal seam permeability-improvement operation, and then the gas extraction pipes are used for discharging the extraction inversion solvent and then conduct gas extraction. Accordingto the solvent extraction, wetting inversion, and impulse fracturing triune coal permeability-improvement method, the advantages of the extraction solvent, the wetting inversion agent and impulse fracturing are brought into full play, the method is simple and efficient, and the permeability-improvement of a coal seam can be greatly improved.

Description

technical field [0001] The invention relates to a three-in-one coal body anti-permeability method of solvent extraction, wet reversal, and pulsation fracturing, which belongs to the related technical field of underground gas drainage in coal mines, and is especially suitable for soft, high-gas and low-permeability coal seams. Background technique [0002] With the continuous deepening of coal mining depth in our country, the air permeability of coal seams restricts gas drainage more and more seriously, and good coal seam anti-reflection technology has become an essential technology for deep coal mine mining. At present, the gas extraction method in my country is mainly drilling, which has high requirements on the air permeability of coal seams. [0003] In order to improve the air permeability of coal seams, many scholars in my country have proposed many coal seam anti-permeability methods, such as slotting in boreholes for pressure relief and anti-permeability methods, loos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/22E21B43/26
CPCE21F7/00E21B43/16E21B43/26
Inventor 林柏泉王正杨威
Owner CHINA UNIV OF MINING & TECH
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