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Hydraulic oil elasticity modulus and thermal expansion coefficient measuring device

A technology of thermal expansion coefficient and elastic modulus, which is applied in the field of measuring devices for hydraulic oil physical quantities, can solve problems such as difficult pressure adjustment, difficult temperature adjustment, and failure to reflect the real volume of the measured hydraulic oil, so as to achieve reliable work, save time and cost effect

Active Publication Date: 2014-07-23
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
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AI Technical Summary

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

Method used

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  • Hydraulic oil elasticity modulus and thermal expansion coefficient measuring device
  • Hydraulic oil elasticity modulus and thermal expansion coefficient measuring device
  • Hydraulic oil elasticity modulus and thermal expansion coefficient measuring device

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Embodiment Construction

[0031] In order to make the purpose of the invention, technical solutions and beneficial effects of the present invention clearer, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. The features in can be combined arbitrarily with each other.

[0032] The design basis of this measuring device is the definition of hydraulic oil bulk modulus and thermal expansion coefficient.

[0033] 1. Definition of bulk modulus of hydraulic oil

[0034] K = V 0 ΔP ΔV

[0035] In the formula, K is the bulk modulus of hydraulic oil (MPa); V 0 is the oil volume in the initial state (mm 3 ); ΔP is the change of oil pressure (MPa); ΔV is the change of oil volume corresponding to ΔP (mm 3 ).

[0036] According to the above formula, it can be known that to measure the bulk modulus of hydraulic oil, it is necessary to know the initial vo...

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Abstract

The invention relates to a hydraulic oil elasticity modulus and thermal expansion coefficient measuring device which comprises a sealed cylinder, a piston and a parameter measuring component, wherein the piston is located in the sealed cylinder to isolate the sealed cylinder into two sealed chambers; a test medium runner is formed at the bottom of each sealed chamber; a communicated hydraulic oil passage is formed in the piston; the parameter measuring component is fixedly connected on the piston, and an output signal line is connected to a control panel of a simulator. The measuring device disclosed by the invention can be connected to the simulator to realize simulation at high temperature and under high pressure, and simultaneously an elasticity modulus and a thermal expansion coefficient synchronous with the elasticity modulus are obtained; physical parameters and a working environment of the hydraulic oil are synchronous, therefore the accuracy of measured parameters is guaranteed.

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...

Claims

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Application Information

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IPC IPC(8): G01N19/00G01N25/16
Inventor 陶爱华高辉杨曙东周林
Owner CHINA NAT OFFSHORE OIL CORP
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