High-voltage triaxial resistivity test system and method considering chemical penetration

Abstract

The invention discloses a high-voltage triaxial resistivity test system and method considering chemical penetration. The system comprises a pedestal, a pressure-bearing cylinder, a sample assembly, and a data collection and processing system, wherein the sample assembly comprises an upper pressure head, a lower pressure head, a sample, a sealing layer, and detection electrodeS; the upper pressurehead, the sample and the lower pressure head are coaxially arranged in sequence from bottom to top, permeable stones are arranged between the upper pressure head and the sample and between the sampleand the lower pressure head, the lower pressure head of the sample assembly is fixed with the base, and the upper pressure head of the sample assembly is in contact with the piston rod; a plurality ofdetection electrodes are distributed on the side surface of the sample to form an electrode array; flanges are symmetrically arranged on the two sides of the upper pressure head and the two sides ofthe lower pressure head, and the sealing layer wraps and seals the upper pressure head, the lower pressure head, the sample, the flanges and the detection electrodes. The system can effectively seal the detection electrodes distributed in an electrode array on the side surface of the sample and prevent confining pressure liquid from entering the sample, so that three-dimensional resistivity measurement is carried out by using an inversion imaging method in a triaxial test, and the accuracy of a measurement result is ensured.

Description

technical field [0001] The invention relates to a high-voltage triaxial resistivity testing system and method, in particular to a high-voltage triaxial resistivity testing system and method considering chemical penetration. Background technique [0002] It is a commonly used physical testing method to reflect the physical and mechanical properties of rock and soil materials by measuring the resistivity of the sample. In the triaxial test, the resistivity of the sample can be used to study the resistivity characteristics of the material under different conditions. Legal exploration has important guiding significance. [0003] The accuracy of the resistivity test determines the accuracy of its reflection index. At present, the main test method of resistivity in triaxial test is the two-phase electrode method, that is, electrodes are arranged at the upper and lower ends of the sample, and the resistivity of the sample is obtained by measuring the voltage and current at both en...

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Problems solved by technology

The resistivity inversion imaging method can not only intuitively reflect the resistivity at different positions inside the sample, but also obtain more effective information, and at the same time reflect the anisotropy of the rock, which is superior to the two-phase electrode method. However, the environmental conditions of the triaxial test sample are different from those of the uniaxial test, and it is not yet possible to use the inversion imaging method for resistivity measurement in the triaxial test

[0004] If the inversion imaging method is used to measure the resistivity in the triaxial test, the sealing of the electrode is the first consideration. If the sealing is not good, the confining pressure fluid will enter the inside of the sample, which will not only affect the accuracy of the resistivity measurement, but also It will affect the mechanical properties of the sample; at the same time, the size of the sample is small and the distance between the electrodes is relatively close. If the sample is wrapped with a conventional latex film, the liquid in the sample will accumulate on the surface of the sample during the test, affecting the distance between the electrodes. The insulation between them affects the accuracy of the resistivity; therefore, there is no way to effectively ensure the sealing performance of the electrodes, and it is impossible to use the inversion imaging method for three-dimensional resistivity measurement in the triaxial test

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