Method and device for measuring pore volume change of porous medium

A technology of pore volume and porous media, applied in measuring devices, suspension and porous material analysis, permeability/surface area analysis, etc., can solve the problems of inconvenient reading, complicated operation, rapid deformation and destruction process, etc., and achieve remarkable results

Inactive Publication Date: 2011-03-30
中国科学院武汉岩土力学所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the gas method and Pomeranz's law are mostly used to measure the porosity of porous media, and the porosity difference is used to characterize the change in pore volume, and the pore pressure in the traditional test process is basically limited within 1MPa.
This traditional method and device is no longer suitable for the study of the porosity change law of deep-buried reservoirs and cap rocks with low porosity and high pore pressure, and the traditional method is complicated to operate, with large errors and inconvenient readings. The reasons are: 1. This type of engineering reservoir Groundwater seeps in the caprock, and the traditional method using gas as the fluid...

Method used

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  • Method and device for measuring pore volume change of porous medium
  • Method and device for measuring pore volume change of porous medium
  • Method and device for measuring pore volume change of porous medium

Examples

Experimental program
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Embodiment 1

[0048] A method for measuring the pore volume variation of porous media, the steps are as follows:

[0049] 1) According to figure 1 It can be seen that the test piece 1a is placed in the holder 1, the entire measuring device is placed in the constant temperature bath 12, the constant temperature bath 12 is turned on and the constant temperature is set and the temperature reading T is recorded. 0 (T 0 Slightly higher than room temperature, here is 20-60°C), which is the initial temperature. After the temperature stabilizes, fill the port of the confining pressure control valve 11 with oil to load the confining pressure stress, and record the reading Pc of the confining pressure gauge 2 0 (Pc 0 higher than the pore compressive stress, here is 1~70MPa), which is the initial confining compressive stress of the tested piece.

[0050] 2) Close the upstream control valve 7 and the pressure regulating and venting valve 10, open the communication valve 6, the downstream control val...

Embodiment 2

[0055] according to figure 1 It can be seen that a measuring device for the volume change of pores in porous media includes a holder 1, a confining pressure gauge 2, an upstream pressure gauge 3, a downstream pressure gauge 4, a pressure regulating controller 5, a communication valve 6, and an upstream control valve 7 , downstream control valve 8, pressure regulating control valve 9, vent valve 10, confining pressure control valve 11 and constant temperature bath 12.

[0056] The test object 1a is placed in the holder 1, the confining pressure control valve 11 is connected to the confining pressure end of the holder 1, the confining pressure end of the holder 1 is connected to the confining pressure gauge 2, the upstream pressure gauge 3 and the downstream The pressure gauge 4 is respectively connected to the upstream and downstream of the holder 1, the communication valve 6 is connected to the upstream and downstream of the holder 1 for closing or disconnecting the upstream a...

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Abstract

The invention discloses a method and a device for measuring the pore volume change of a porous medium. The method comprises the following steps of: A, putting a workpiece to be tested into a holder; B, closing an upstream control valve and a vent valve, and opening a communication valve, a downstream control valve and a pressure regulating control valve; C, after the device is positioned in the vacuum state and stable, closing the downstream control valve; D, performing confining pressure stepwise loading/unloading experiments; and E, opening the vent valve, setting a pressure regulating controller to be zero, and finishing the measurement of the pore volume change. The pressure regulating controller mainly comprises a front fixing sleeve, a rear fixing sleeve, a movable sleeve, a sliding head, a sliding block, a screw rod, a rotary head and a rotary rod, wherein the rear fixing sleeve is provided with a main scale; the movable sleeve is provided with a branch scale; and the main scale and the branch scale are used for reading the volume difference. The device is easy to operate, is convenient to read, is stable in performance and reliable in measurement, and is suitable for quick, continuous, accurate and intuitive measurement of wide-range pore volume change of porous media under the condition of complicated stress variation.

Description

technical field [0001] The present invention relates to the porosity measurement technology of rock-like porous media materials, more specifically to a method for measuring the pore volume change in porous media, and also to a measuring device for the pore volume change in porous media, which is suitable for large-scale Continuous, rapid, accurate measurement and direct reading of the pore volume of porous media in a wide range under the condition of stress (such as confining pressure stress, temperature stress) changes. Background technique [0002] Porosity is an important property of porous media materials such as pores and fractures. In recent years, due to underground oil and gas storage, CO 2 For the safety evaluation of saline water layer storage and groundwater energy storage projects, it is necessary to study the porosity change law of such engineering reservoirs and caprocks in the process of deformation and failure under cyclic loading, that is, the porosity of p...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 李小春王颖魏宁
Owner 中国科学院武汉岩土力学所
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