Measuring device for elastic modulus and thermal expansion coefficient of hydraulic oil

Abstract

The invention relates to a measuring device for elastic modulus and thermal expansion coefficient of hydraulic oil, comprising a closed cylinder, a piston, and a parameter measuring assembly. The piston is located in the closed cylinder, which isolates the closed cylinder into two closed chambers. There is a test medium flow channel at the bottom of the closed cavity, and there is a through hydraulic oil channel in the piston; the parameter measurement component is fixedly connected to the piston, and its output signal line is connected to the control panel of the simulation device. The measuring device can be connected to the simulation device to realize the simulation of high temperature and high pressure environment, and at the same time obtain the synchronous elastic modulus and thermal expansion coefficient. The physical parameters of the hydraulic oil and its working environment are synchronized, ensuring the accuracy of the measured parameters.

Description

technical field [0001] The invention relates to a measuring device for physical quantities of hydraulic oil, in particular to a measuring device for simultaneously measuring the elastic modulus and thermal expansion coefficient of hydraulic oil when simulating an ultra-high temperature and ultra-high pressure working environment. Background technique [0002] The working environment of the logging instrument is a high temperature and high pressure environment, so the logging instrument uses high temperature resistant components or materials to realize the high temperature resistance performance of the instrument. In order to avoid damage to the instrument due to high pressure, it is necessary to adopt a high pressure resistant design. In the case that the high material still cannot meet the pressure resistance requirements, it is usually used to balance the internal and external pressure to reduce the pressure resistance requirements of the instrument. [0003] Hydraulic oil...

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Problems solved by technology

[0007] 1) It is difficult to adjust the temperature of the hydraulic oil under test within the range of -40 to 180°C and stabilize the temperature at a certain value

[0008] 2) It is difficult to adjust the pressure of the measured hydraulic oil within the range of 0-140MPa, and it is difficult to achieve such an ultra-high pressure with a single oil pump

[0009] 3) It is difficult to realize the dynamic seal of the compressed piston rod when the maximum differential pressure reaches 140MPa, that is, it is difficult to control the leakage of the measured hydraulic oil through the dynamic seal

[0010] 4) Under ultra-high pressure, the measured hydraulic oil cavity, that is, the cylinder body, undergoes radial deformation. At this time, measuring the displacement of the piston cannot reflect the real volume of the measured hydraulic oil

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