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Method for simultaneously testing effective stress coefficient and porosity of porous rock under stress conditions

A technology of effective stress, porous rock, applied in the field of mechanical properties of porous rock, can solve the problem of simultaneous testing of effective stress coefficient and porosity

Inactive Publication Date: 2014-11-05
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The existing porosity testing methods have not been able to simultaneously test the effective stress coefficient and porosity under stress conditions

Method used

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  • Method for simultaneously testing effective stress coefficient and porosity of porous rock under stress conditions
  • Method for simultaneously testing effective stress coefficient and porosity of porous rock under stress conditions
  • Method for simultaneously testing effective stress coefficient and porosity of porous rock under stress conditions

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with specific implementation and calculation methods.

[0064] Simultaneous testing method of effective stress coefficient and porosity of porous rock under stress conditions, the testing method includes depletion fluid volume calibration and simultaneous testing of effective stress coefficient and porosity of porous rock, the testing method is carried out according to the following steps:

[0065] Kerosene is used as the pore pressure fluid to exert pore pressure on the rock sample. On the one hand, kerosene is insoluble in water and easily soluble in alcohol and other organic solvents, which can avoid the chemical interaction between it and rock minerals; on the other hand, its large compressibility coefficient (>0.5mm 2 / KN) makes it assumed that kerosene is incompressible during the test, that is, the change of kerosene volume in the pores reflects the change of pore volume.

[0066] Consumed Kero...

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Abstract

The invention discloses a method for simultaneously testing effective stress coefficient and porosity of porous rock under the stress conditions. According to the test method, pores of a rock sample are pressurized through a pore pressure loading pump while position of a piston inside the pump is positioned and volume of a fluid inside the pump is recorded; pore volume data of the rock sample is obtained by the use of volume change data of the fluid inside the pump; and through a standard cylindrical steel sample calibration test, pore volume measurement errors caused by fluid volume consumption by a pore pressure loop of test equipment are eliminated. Effective stress coefficient and porosity of porous rock can be obtained by the utilization of rock strain data, stress data and pore volume change data during external load and pore pressure loading process. By changing different confining pressure conditions, bias conditions and pore pressures, effective stress coefficient and porosity of porous rock under different stress conditions can be tested.

Description

technical field [0001] The invention relates to a method for simultaneously testing effective stress coefficient and porosity of porous rock under stress conditions, belonging to the research category of mechanical properties of porous rock. It is mainly used to study the interaction law between porosity and effective stress coefficient of porous rock under the action of pore water pressure. It is suitable for experimental research on multi-field coupling scientific issues in the process of extraction and injection of fluid materials in deep porous rock reservoirs. Background technique [0002] Effective stress coefficient and porosity are important evaluation indexes in porous rock reservoir engineering. Carbon dioxide geological storage, enhanced geothermal system development, geological disposal of nuclear waste, and underground energy storage are all storage projects. During the injection and extraction process of rock formation reservoirs, the rise and fall of pore wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 郑虹冯夏庭高红胡大伟
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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