Method for measuring gas permeation coefficient of compact rock under three dimensional stress condition

A technology of three-dimensional stress and gas permeation, which is applied in the directions of measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of complex on-site sample operation, long test period, and huge cost, and achieve test results. The effect of short process, overcoming large measurement error, and simple and convenient test operation

Inactive Publication Date: 2014-07-09
HOHAI UNIV
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  • Application Information

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Problems solved by technology

The on-site sample operation of gas permeability coefficient is complicated, the test period is long and the cost is huge.

Method used

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  • Method for measuring gas permeation coefficient of compact rock under three dimensional stress condition
  • Method for measuring gas permeation coefficient of compact rock under three dimensional stress condition
  • Method for measuring gas permeation coefficient of compact rock under three dimensional stress condition

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1) This example is to measure the permeability coefficient of tight sandstone under the action of each stress path. First, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard, and the rock sample is dried in an oven for 24 hours and then loaded into a triaxial pressure chamber;

[0043] 2) Apply the confining pressure to the predetermined value of 20MPa, and keep the confining pressure unchanged;

[0044] 3) After the confining pressure is stable, apply a bias voltage to 60MPa and keep the bias voltage unchanged;

[0045] 4) After the bias voltage is stabilized, close the gas outlet switch and increase the gas pressure at the gas inlet to 10MPa. Due to the pressure difference, the gas gradually flows through the rock sample to the gas discharge system, and the pressure at both ends of the sample is gradually balanced to 5MPa;

[0046] 5) When the pressure value of the air inlet and the air outlet are equal, the pressure o...

Embodiment 2

[0050] 1) This example is to measure the permeability coefficient of granite gneiss under each stress path. Firstly, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard. The rock sample is dried in an oven for 24 hours and then loaded into a triaxial pressure chamber. middle;

[0051] 2) Apply the confining pressure to the predetermined value of 20MPa, and keep the confining pressure unchanged;

[0052] 3) After the confining pressure is stable, apply a bias voltage to 60MPa and keep the bias voltage unchanged;

[0053] 4) After the bias voltage is stabilized, close the gas outlet switch and increase the gas pressure at the gas inlet to 10MPa. Due to the pressure difference, the gas gradually flows through the rock sample to the gas discharge system, and the pressure at both ends of the sample is gradually balanced to 5MPa;

[0054] 5) When the pressure value of the air inlet and the air outlet are equal, the pressure of the ai...

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Abstract

The invention relates to a method for measuring a gas permeation coefficient of a compact rock under a three dimensional stress condition, and in particular relates to a test device and a test method for calculating the gas permeation coefficient of the rock by a drawing method by recording a relation between an upstream and downstream pressure difference and time at different moments. The method comprises the steps of preparing a test sample, applying confining pressure, and recording the value. The measurement method is suitable for different types of rocks, such as compact sandstone, granite and shale; the gas permeation coefficients under different confining pressures and different bias pressures and in a triaxial compression breakage process can be measured; gas permeation coefficient test results under all stress paths are compared with that of other conventional test measures to evaluate the reliability and the effectiveness of the device and the method.

Description

technical field [0001] The invention relates to a method for measuring the gas permeability coefficient of relatively dense rock under the three-dimensional stress condition, in particular to a method for obtaining the gas permeability coefficient of rock by recording the relationship between the pressure difference between the upstream and downstream at different times and time, and obtaining the gas permeability coefficient of the rock by drawing Devices and methods. [0002] technical background [0003] In modern rock engineering, the gas permeability coefficient of rock is a very important technical parameter, especially in underground natural gas storage, shale gas exploitation and nuclear waste underground storage projects. The current methods for determining rock gas permeability coefficient mainly focus on the flow method under static water conditions. However, due to the complex environment of rock materials, static water conditions cannot completely simulate the ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 王伟徐卫亚王环玲李雪浩王如宾朱其志田振元贾朝军吕军
Owner HOHAI UNIV
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