An acoustic emission probe installation device for true triaxial hydraulic fracturing simulation experiments

Abstract

The invention provides a sound emission probe mounting device for a true triaxial hydraulic fracturing simulation experiment, and relates to triaxial fracturing initiation and expansion law physical simulation experiment technology. The sound emission probe mounting device for the true triaxial hydraulic fracturing simulation experiment comprises a bearing plate mounted in a pressure chamber, at least one mounting hole is formed in the bearing plate and used for mounting a sound emission probe, and a wiring groove is formed in the bearing plate and used for mounting a lead for connecting the sound emission probe with an amplifier. As the sound emission probe is mounted on the bearing plate mounted in the pressure chamber, the path of transmitting a sound emission signal generated by a rock sample to the sound emission probe can be shortened, the sound emission probe can be protected from damage in the process of a high-load experiment by the aid of a three-level counter bore structure, and accuracy and reliability of triaxial fracturing experiment results can be improved.

Description

technical field [0001] The invention relates to a physical simulation experiment technology of true triaxial hydraulic fracturing crack initiation and expansion law, in particular to an acoustic emission probe installation device used for true triaxial hydraulic fracturing simulation experiments. Background technique [0002] The true triaxial hydraulic fracturing simulation experiment device is an effective laboratory research method to understand the law of hydraulic fracture initiation and propagation. It simulates the hydraulic fracturing process in the oil field. The fluid is injected into the rock sample through the high-pressure pump group to prefabricate the simulated wellbore and generate pressure at the bottom of the wellbore. When the pressure exceeds the loading stress and tensile strength of the rock, rupture occurs and continues to expand. At the same time of rock destruction, due to the rapid release of local energy due to its own elastic deformation, crack ex...

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Problems solved by technology

[0005] However, when the acoustic emission probe is not in contact with the surface of the rock sample, the propagation path of the acoustic emission signal generated by the rock sample during the experiment is longer, resulting in a decrease in the number and energy level of the acoustic emission signal received by the acoustic emission probe; at the same time, the external Environmental noise also has a great influence on the signal-to-noise ratio of the acoustic emission signal, which leads to poor reliability of the experimental results

When the acoustic emission probe is directly arranged in the counterbore on the surface of the rock sample, the experimental operability is poor and the processing is cumbersome; at the same time, the high confining pressure condition can easily cause damage to the acoustic emission probe

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