Strain and acoustic wave test device and method for high-temperature rock sample

Abstract

The invention discloses a strain and acoustic wave test device and method for a high-temperature rock sample; the strain and acoustic wave test device mainly comprises an acoustic wave transmitting terminal, an upper bearing shaft, a corundum ejector pin, an upper slide plate, a lower slide plate, an insulation shell, a carbon fiber sleeve, a rock sample, a lower bearing shaft, an acoustic wave receiving terminal, a lower copper electrode, pearl powder, a temperature sensor, a transformer, a temperature-acoustic wave control box, an oscilloscope, an upper copper electrode, and a data collection and processing system; the method comprises: (1) mounting the device on a uniaxial mechanical tester stroke; (2) heating the rock sample; (3) performing compression test; (4) acquiring a difference between the upper slide plate and the lower slide plate which is an axial strain value; (5) transmitting acoustic wave from the acoustic wave transmitting terminal, receiving by the acoustic wave receiving terminal after the wave passes the rock sample so as to obtain an acoustic wave temporal difference of the rock sample; (6) collecting data, and storing. The device and method according to the invention have the advantages the principle is reliable, the device and method are simple to perform, mechanical properties of rock are acquired in real time, and the device and method have a promising market application prospect.

Description

technical field [0001] The invention relates to a high-temperature rock sample strain and acoustic wave testing device and testing method for a uniaxial mechanical testing machine in the fields of high-temperature rock mass geothermal development and oil-gas well engineering. Background technique [0002] Under high temperature conditions, due to the different thermal expansion of various mineral particles that make up the rock, micro-cracks will appear inside the rock, which will lead to the deterioration of the mechanical properties of the rock, which will cause the instability of the well wall of geothermal development wells or oil and gas wells, resulting in well collapse and other serious safety accidents. Therefore, it is of great practical significance to study the variation law of rock mechanical parameters at high temperature. [0003] Chinese patent CN205643032U discloses a uniaxial test device for the high temperature stability of asphalt mixture, which can simul...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN205643032U discloses a uniaxial test device for the high temperature stability of asphalt mixture, which can simulate the temperature change process of the asphalt pavement from the road surface after being heated, but the research object of this device is asphalt, and can only obtain uniaxial shear resistance Intensity; Chinese patent CN104865137A and Chinese patent CN105092387A respectively disclose a test device for testing the uniaxial tensile mechanical properties of conductor materials in a high-temperature environment and an in-situ tensile testing system for high-temperature mechanical properties of small-sized monocrystalline silicon specimens. Both devices are subjected to tensile mechanical testing

Some of the existing rock uniaxial mechanics experimental devices cannot be heated, and some of them have a very limited heating temperature, which cannot test rock mechanical parameters at higher temperatures, and basically do not have the function of sound velocity testing

Images