Testing machine for testing triaxial stress and acoustic emission of rock at high temperature and high pressure

Abstract

The invention relates to a testing machine for testing triaxial stress and acoustic emission of rock at high temperature and high pressure. The testing machine comprises an upper pressure head, a bottom plate, side pressure head assemblies, a heating rod assembly, an acoustic emission probe assembly and a temperature sensor assembly. A triaxial test piece is arranged on the bottom plate, the side pressure head assemblies are arranged on the periphery of the triaxial test piece, and the upper pressure head is arranged above the triaxial test piece; a heating rod assembly is mounted between the side pressure head assemblies, and the lower part of the heating rod assembly abuts against the bottom plate; the first acoustic emission probe, the second acoustic emission probe and the third acoustic emission probe are respectively arranged in the side pressure head assembly and the bottom plate; the first temperature sensor and the second temperature sensor are respectively arranged in the first side pressure head and the third side pressure head or the second side pressure head or the fourth side pressure head, and can be used for carrying out a triaxial loading test in a high-temperature and high-pressure environment, receiving a complete acoustic emission signal and reflecting a real stratum stress condition.

Description

technical field [0001] The invention belongs to the field of petroleum engineering rock mechanics, in particular to a testing machine used for rock triaxial stress and acoustic emission testing under high temperature and high pressure. Background technique [0002] Rock triaxial compression, acoustic emission geodesic stress and other tests are important means to study the mechanical properties of reservoir rocks in petroleum engineering. Through a series of rock mechanical parameter experiments, the rock mechanical properties of the stratum are obtained, which provides support for the transformation and development of the reservoir. At present, with the continuous exploitation of oil and gas resources, the focus of oil and gas exploration and development is gradually developing to deep formations. While the depth of the formation is increasing, the temperature and pressure of the formation are also increasing. In the process of rock triaxial compression, acoustic emission...

AI Technical Summary

Problems solved by technology

However, the traditional rock mechanics testing system mainly uses liquid to exert confining pressure on the specimen. This loading method causes great difficulties in the simulation of high temperature and high pressure environment.

When heating the test piece, a large part of the heat transfer will be dissipated into the liquid that exerts the confining pressure, resulting in low heating efficiency, time-consuming and labor-intensive; and the heated hydraulic oil will still Damage to other equipment such as pipelines and oil storage chambers will affect the efficiency of the experiment

At the same time, the acoustic emission signal generated by the test piece needs to pass through the hydraulic oil in the confining pressure cylinder to be transmitted to the signal receiver during the experiment. This process will cause serious attenuation of the acoustic emission signal, and the information carried by the acoustic signal will be partially lost. Stress analysis results are affected

In addition, most of the existing experimental equipment uses two different equipment to carry out core rock mechanical parameters and in-situ stress tests respectively, which requires a lot of cores. Due to the difficulty of coring in deep drilling and limited cores, one equipment is urgently needed to realize one experiment with a group of cores. It can jointly test the core rock mechanical parameters, in-situ stress

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