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Sticking method of strain gauge for differential strain test piece

A strain gauge and differential strain technology, which is applied in the field of strain gauge bonding of differential strain test pieces, can solve problems such as strain gauges are easy to fall off, errors or delays are easy to occur, and the confining pressure of the test piece is increased, so as to improve the success rate of experiments and paste The method is simple and the effect of reducing damage

Active Publication Date: 2020-06-02
克拉玛依市昂科能源科技有限公司
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Problems solved by technology

However, in this invention, the strain gauge is indirectly connected to the measured member by welding or riveting the transverse guide frame, longitudinal guide frame and metal sheet. The volume deformation modulus between the test connections is relatively large, and the test results are greatly affected by the environment. prone to errors or delays
In addition, the differential strain experiment needs to be immersed in oil to increase the confining pressure of the specimen, and the rock specimen must be sealed as a whole before the experiment, and the external strain measurement method of this invention is not suitable for the differential strain experiment
[0005] At present, the bonding method of strain gauges is greatly affected by the environment and is relatively complicated, and the strain gauges are easy to fall off and be damaged. Therefore, it is urgent to find a bonding method for strain gauges, which makes the method simpler and more convenient, and can solve the problem of rock surface The problem of roughness makes the pasted strain gauges not easy to fall off and be damaged during measurement, and at the same time can improve the success rate of experiments

Method used

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  • Sticking method of strain gauge for differential strain test piece

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Embodiment Construction

[0028] A method for pasting strain gauges of differential strain specimens, comprising the following steps:

[0029] (1) Make a copper foil 2 whose length is twice the length of the strain gauge (5mm) and whose width is twice the width of the strain gauge (10mm). The size of the copper foil 2 is 10mm×20mm and the thickness is 0.18mm. Use a rubber rod Flatten the copper foil 2 until there are no bumps or scratches;

[0030] (2) Wipe the surface of test piece 1 with a cotton swab dipped in absolute alcohol until the cotton swab no longer turns black to ensure that the surface of test piece 1 is clean;

[0031] (3), apply AB glue on the back of copper foil 2 in step (1), and paste the copper foil 2 on the surface of test piece 1 in step (2);

[0032] (4) Cover the copper foil 2 with a layer of polyvinyl chloride film, and squeeze out excess glue and air bubbles under the copper foil 2 along the long side of the copper foil;

[0033] (5) Open the polyvinyl chloride film to check...

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Abstract

The invention provides a differential strain test piece strain gauge sticking method and relates to the technical field of oil and natural gas exploration. According to the method, metal pieces with the small modulus of elasticity such as copper foils are mainly used as gaskets of strain gauges to reduce the damage to the strain gauges by the rough surface of the rock. The method is simple and convenient to implement and can solve the problem of the rough surface of the rock, so that the stickup strain gauges are not easy to fall off and break during measurement, meanwhile the test result is stable and accurate, and the experimental success rate is increased.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas exploration, in particular to a method for pasting strain gauges of differential strain test pieces. Background technique [0002] In recent years, the study of geostress has had many applications. The magnitude and change of in-situ stress is one of the factors that control the distribution of oil and gas enrichment areas, the expansion of hydraulic fractures, the distribution of reservoir fractures, the long-term external load of oil well casing, the fracture pressure and collapse pressure of drilling formations, and is also one of the factors that control the parameters of oil and gas fields. It is an indispensable basic data for the formulation of development plan and oil well engineering design. At present, the laboratory mainly uses the acoustic emission method, the inelastic strain recovery method, and the differential strain analysis method to measure the ground stress. Among...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B11/00
CPCF16B11/006
Inventor 邱潇焦福生闫旭华
Owner 克拉玛依市昂科能源科技有限公司
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