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Deep gas-containing coal rock pulse fracturing experiment device and experiment method

An experimental method, gas-coal technology, applied in the direction of measuring devices, using repeated force/pulsation force to test the strength of materials, instruments, etc., can solve the problems of insufficient power, unsatisfactory effect of pressure relief and anti-reflection, etc., and achieve practical and realistic effects

Pending Publication Date: 2020-12-11
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] The effect of pressure relief and permeability enhancement by traditional measures such as hydraulic fracturing is not ideal, especially when mining deep low-permeability coal seams, traditional pressure relief and permeability enhancement measures are not enough

Method used

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  • Deep gas-containing coal rock pulse fracturing experiment device and experiment method

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Embodiment Construction

[0041] Such as figure 1 As shown, the deep gas-containing coal rock pulsation fracturing experiment system of the present invention includes a triaxial holder 1 for clamping and loading of coal samples. The triaxial holder 1 has an air inlet port and is used for discharging after the experiment ends. Gas outlet port;

[0042] The triaxial holder 1 is connected with six sets of loading devices 2 for applying pressure (ie stress) to the coal sample; the six sets of loading devices 2 are respectively located in front, rear, left, right, above and below the coal sample, six The sleeve loading device 2 is connected with a pulsating pump 3 for providing loading pressure and a first electric control device 4 for controlling the loading device 2;

[0043] The air inlet of the pulsation pump 3 is connected with a carbon dioxide cylinder 5, and the outlet pipeline 6 of the carbon dioxide cylinder 5 is provided with a third decompression valve 7, a third valve 8 and a third pressure gau...

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Abstract

The invention discloses a deep gas-containing coal rock pulse fracturing experiment system which comprises a three-axis clamp holder; the three-axis clamp holder is connected with six sets of loadingdevices used for applying pressure to a coal sample; the six sets of loading devices are connected with a pulsating pump used for providing loading pressure and a first electric control device used for controlling the loading devices; a gas inlet of the pulsating pump is connected with a carbon dioxide gas cylinder; the pulsating pump is connected with a second electric control device for controlling the pulsating pump; a gas inlet connector of the three-axis clamp holder is connected with a gas main pipe; the gas main pipe is connected with a gas injection device used for enabling the coal sample to adsorb gas, a helium gas injection device used for carrying out gas tightness inspection and a vacuumizing device used for vacuumizing. The invention also discloses a corresponding experimental method. The stress, seepage and temperature conditions of a coal seam under a deep mining condition can be simulated more accurately, guidance is provided for deep coal body fracturing permeabilityimprovement and regional coal and gas outburst prevention and control, and very practical and valuable practical significance is achieved.

Description

technical field [0001] The invention relates to the technical field of coal mines, in particular to an experimental device for pulsating fracturing of deep gas-containing coal rocks. Background technique [0002] Gas occurrence in deep coal seams in my country is characterized by "three highs and one low" (high stress, high gas pressure, high gas content and low permeability), and low gas permeability of coal seams is the bottleneck of coal mine gas extraction. For outburst coal seams that are difficult to extract, in order to improve the effect of pre-draining coal seam gas, various means must be used to relieve the pressure of the coal seam and increase permeability. [0003] The effect of pressure relief and permeability enhancement by traditional measures such as hydraulic fracturing is not ideal, especially in the mining of deep low-permeability coal seams, traditional pressure relief and permeability enhancement measures are insufficient. At the same time, because the ...

Claims

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Application Information

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IPC IPC(8): G01N3/36G01N3/02G01N3/04
CPCG01N3/36G01N3/02G01N3/04G01N2203/001G01N2203/0019G01N2203/0044G01N2203/0067G01N2203/0258G01N2203/0411G01N2203/0226G01N2203/0228
Inventor 刘佳佳胡建敏方迎香杨明张学博陈守奇申孟起蔡行行
Owner HENAN POLYTECHNIC UNIV
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