Method for simultaneously testing porosity and permeability of porous rock under conditions of triaxial stress and pore pressure

A pore pressure and triaxial stress technology, used in permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc. The influence of the test results of the casing sidewall voids, the influence of the eccentric pressure permeability and porosity, etc. are not considered, so as to achieve the effect of eliminating errors.

Active Publication Date: 2019-11-26
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, for the test method for simultaneous determination of rock porosity and permeability under stress conditions, for example, Chinese Patent Publication No.: CN 103207138 A Publication Date: 2013.07.17 The title of the invention is "A joint measurement of tight rock permeability and permeability under dynamic confining pressure. For tight rocks, this method adopts the transient method of gas pressure difference, which is not suitable for rocks with large porosity

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  • Method for simultaneously testing porosity and permeability of porous rock under conditions of triaxial stress and pore pressure
  • Method for simultaneously testing porosity and permeability of porous rock under conditions of triaxial stress and pore pressure
  • Method for simultaneously testing porosity and permeability of porous rock under conditions of triaxial stress and pore pressure

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[0068] The present invention will be further described below in conjunction with specific implementation examples.

[0069] Using red sandstone as the case object, the method of simultaneously testing the porosity and permeability of red sandstone under the conditions of triaxial stress and pore pressure, the test method is carried out according to the following steps:

[0070] Implement 10MPa confining pressure and 5MPa bias pressure and use water as pore fluid to exert pore pressure on the upper and lower ends of the red sandstone sample.

[0071] Calibration of depleted water volume in seepage circuits under triaxial stress and pore pressure conditions

[0072] a. Put a standard cylindrical steel sample with a diameter of 50 mm and a height of 100 mm into the sealing sleeve, place permeable gaskets on the upper and lower ends of the standard cylindrical steel sample, and fix the sealing sleeve between the indenter 1 and the base 2 in the triaxial chamber. An LVDT3 is insta...

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Abstract

The invention, which belongs to the field of rock reservoir engineering research, discloses a method for simultaneously testing the porosity and permeability of the porous rock under conditions of triaxial stress and pore pressure. According to the method, upstream and downstream motor servo pumps apply pore pressures to a reservoir rock sample in a triaxial stress state; fluid pressures in the pumps are set and fluid volume data in the pumps are obtained to realize testing the rock pore volume under the pore pressure condition. An injection pump and a collection pump are used for adjusting anosmotic pressure difference and the flow through the rock under the pressure difference is tested, so that the permeability under the stress state is obtained. According to the invention, with setting of different confining pressure conditions, biasing conditions and fluid pressure values at the upper and lower ends of the rock sample, the porosity and permeability values of the reservoir rockunder different stress and pore pressure conditions are tested simultaneously to provide technical parameters for controlling the exploration and injection process of the fluid substances in the deepporous rock reservoir.

Description

technical field [0001] The invention relates to a method for simultaneously testing the porosity and permeability of porous rocks under the conditions of triaxial stress and pore pressure. The testing method is mainly aimed at porous rocks in reservoirs and belongs to the research category of rock reservoir engineering. It is mainly used to study the co-evolution law of storage space and permeability of porous rock reservoirs under different water pressure and formation stress environments. 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] Permeability coefficient and porosity are important evaluation indexes in porous rock reservoir engineering. Carbon dioxide geological storage, coal bed methane and geothermal exploitation, geological disposal of nuclear waste, and seawater recharge are all storage projects. During t...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826G01N15/088
Inventor 郑虹冯夏庭李邵军江权李晋
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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