Ultrasonic excitation-assisted hydraulic fracturing pressure relief method for improving permeability in underground coal mine

An ultrasonic excitation and hydraulic fracturing technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as production replacement tension, achieve low cost, safe and reliable process, and save pre-extraction drilling engineering. amount of effect

Inactive Publication Date: 2020-09-22
SHAANXI COAL & CHEM TECH INST
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a coal mine ultrasonic excitation assisted hydraulic fracturing pressure relief and anti-permeability method to overcome the above-mentioned defects in the prior art. The economic and social benefits of

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  • Ultrasonic excitation-assisted hydraulic fracturing pressure relief method for improving permeability in underground coal mine
  • Ultrasonic excitation-assisted hydraulic fracturing pressure relief method for improving permeability in underground coal mine

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Embodiment

[0037] The 222 working face of an outburst mine is a single 1 Coal seam mining, the occurrence of coal seam in the working face is stable, there are no faults, caves, collapse columns, folds and other geological structures; the strike length of the working face is 1400m, the inclination length is 220m, the average thickness of the coal seam is 4.5m, and the inclination angle of the coal seam is 8°; the gas content of the coal seam in the working face is 6.5 ~10.7m 3 / t, gas pressure 0.5~1.2MPa, coal seam permeability coefficient 0.022~0.053m 2 / (MPa 2 · d), which belongs to the difficult-to-drain coal seam; the working face adopts the anti-outburst measures in the coal seam gas area of ​​the coal seam gas area in the pre-drainage mining area by drilling along the bedding, and the spacing of the holes is 4m.

[0038] Such as figure 1 , figure 2 As shown, a kind of coal mine underground ultrasonic excitation assisted hydraulic fracturing depressurization anti-permeability m...

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Abstract

The invention discloses an ultrasonic excitation-assisted hydraulic fracturing pressure relief method for improving the permeability in an underground coal mine. The method takes the advantages of ultrasonic excitation and hydraulic fracturing technologies for permeability improvement; the hydraulic fracturing is implemented on the basis of ultrasonic excitation; and ultrasonic shock waves generated by an ultrasonic excitation device are used for changing the pore-fracture structure of a coal reservoir; and a large number of new uniformly distributed fractures are produced in advance, provideguiding fracture channels for high-pressure water splitting coal body expansion and fracturing in the hydraulic fracturing process and assist in achieving the relatively uniform hydraulic fracturing,thus, the controllability of the effective range of hydraulic fracturing is improved, and the permeability of a coal seam and the amount of gas extraction are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency gas drainage for comprehensive pressure relief and permeability enhancement of coal seams, and specifically relates to an ultrasonic excitation-assisted hydraulic fracturing pressure relief and permeability enhancement method in coal mines. Background technique [0002] Coal seam gas is one of the factors that restrict the safe and efficient production of high gas and outburst mines. Drilling pre-pumping is the main effective means to solve mine gas disasters. However, most coal seams in high gas and outburst mines in my country are restricted by the poor air permeability of coal seams Influenced by the influence of drilling and drainage, the effect of drilling and drainage is poor, the amount of drainage drilling is large, and the pre-draining time is long, resulting in a large investment in mine safety production and tight production replacement. Targeted implementation of coal seam press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/16
CPCE21B43/16E21B43/26
Inventor 黄克军吕伟伟陈斌胡魏魏关欣杰刘文静梁少剑尹建辉
Owner SHAANXI COAL & CHEM TECH INST
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