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Rock porosity and permeability combined test device and test method under triaxial condition

A technology for rock porosity and joint testing, which is used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc.

Pending Publication Date: 2020-06-12
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Affected by the measurement range of the constant pressure method, the equipment is not ideal for the permeability measurement of low-permeability rocks

Method used

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  • Rock porosity and permeability combined test device and test method under triaxial condition
  • Rock porosity and permeability combined test device and test method under triaxial condition
  • Rock porosity and permeability combined test device and test method under triaxial condition

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Experimental program
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Embodiment 1

[0095] This embodiment provides a joint testing device for rock porosity and permeability under triaxial conditions, such as figure 1 As shown, the device includes: porosity and permeability measurement components, core holders, confining pressure loading components, axial pressure loading components, multi-channel data acquisition cards and data storage and processing modules; wherein the porosity and permeability measurement components, confining pressure loading components and axial pressure The loading assembly is connected to the core holder. The data acquisition card is used to collect the data of the first pressure sensor 5, the second pressure sensor 13 and the differential pressure gauge 6 in the porosity test pipeline, and transmit them to the data storage and processing module.

[0096] The porosity measurement assembly includes a high-pressure gas cylinder 1, a first valve 2, a pore pressure booster pump 3, a second valve 4, a first pressure sensor 5, a differentia...

Embodiment 2

[0105] In this embodiment, the joint test of rock porosity and permeability under triaxial conditions is carried out based on the above-mentioned device. The specific method includes the following steps:

[0106] Step 1: Put a standard cylindrical stainless steel sample 19 with a diameter of 25mm and a length of 50mm into the core holder 17, and seal it with a heat shrinkable tube 18 to isolate the confining pressure and pore pressure;

[0107] Step 2: Apply a certain confining pressure and axial pressure to the stainless steel sample through the confining pressure loading assembly and the axial pressure loading assembly, and then close it, so that the confining pressure and axial pressure are maintained at the design value, and ensure that the pore pressure is formed on the surface of the sample during the measurement process. surface flow;

[0108] Step 3: Vacuumize the porosity and permeability measurement components. Close the second valve 4, keep the third valve 8, the f...

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Abstract

The invention discloses a rock porosity and permeability combined testing device and method under a triaxial condition. The device is used for simultaneously measuring the porosity and permeability ofa rock under a triaxial stress condition, and comprises a pore permeability measuring assembly, a rock core holder (17), a confining pressure loading assembly, an axial pressure loading assembly, a multi-channel data acquisition card (15) and a data storage processing module (16), and the pore permeability measuring assembly, the confining pressure loading assembly and the axial pressure loadingassembly are respectively connected with a rock core holder (17). According to the invention, porosity and permeability tests are completely coupled together. In the gas diffusion process, according to the pressure values of the two ends of the to-be-measured rock and a differential pressure attenuation curve, the porosity and permeability of the rock under a certain triaxial stress are obtained according to the porosity calculation formula and the permeability calculation formula respectively, the correlation between the porosity and permeability of the rock and the correlation between the porosity and permeability of the rock and the stress can be comprehensively analyzed, the test time is shortened to a certain extent, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the field of engineering geology, in particular to a combined testing device and testing method for rock porosity and permeability under triaxial conditions. Background technique [0002] With the development and utilization of underground energy and space, the basic physical and mechanical properties of underground reservoir rocks have a significant impact on the safety of underground engineering. Among them, the porosity and permeability of porous rock, as one of the most basic petrophysical parameters, respectively characterize the storage space characteristics and fluid flow performance of underground reservoir rocks, which are of great significance for the evaluation of oil and gas resources and storage capacity . [0003] Studying the relationship between rock porosity and permeability is of great significance for comprehensively grasping the storage characteristics of reservoir rocks. In addition, the porosity and perm...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0806
Inventor 李霞颖李琦何淼申海萌谢琦峰肖威
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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