Sticking method of strain gauge for differential strain test piece

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...

AI Technical Summary

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

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