A device and method for measuring shear bond strength of high-temperature and high-pressure cementing interface

By designing a high-temperature and high-pressure cementing interface shear bond strength measurement device, the shear bond strength of one and two interfaces can be measured simultaneously under high temperature and high pressure, solving the problem of the inability to simulate high-temperature and high-pressure environments in existing technologies and improving the accuracy and simplicity of measurement.

CN119290741BActive Publication Date: 2025-10-03SOUTHWEST PETROLEUM UNIV
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Patent Information

Application Number
CN202411694243.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2025-10-03
Estimated Expiration
2044-11-25

AI Technical Summary

Technical Problem

Existing technologies are unable to simultaneously measure the shear bond strength of the first and second cementing interfaces under high temperature and high pressure, and are unable to simulate the effects of changes in formation pressure and casing internal pressure on interface bond strength.

Method used

A high-temperature and high-pressure cementing interface shear bond strength measurement device was designed. It includes a top cover, an upper kettle, a lower kettle, a bottom cover, a simulated formation, a simulated casing, a positioning steel cylinder, a floating support plate, a piston cylinder and other components. A hydraulic pump and an electronic control system are used to simulate a high-temperature and high-pressure environment to achieve integrated maintenance and testing of the shear bond strength of the first and second interfaces.

Benefits of technology

It can directly measure the shear bond strength of the first and second interfaces under high temperature and high pressure, and study the influence of changes in formation pressure and casing internal pressure on the bond strength, thereby improving the measurement accuracy and ease of operation and reducing experimental costs.

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Abstract

The present invention discloses a device and method for measuring the shear bond strength of a high-temperature and high-pressure cementing interface, and belongs to the field of oil and gas well cementing. The device includes a kettle body, an oil storage tank, a hydraulic pump, an electronic control system, a display, a support frame and a base. The kettle body includes a top cover, an upper kettle, a lower kettle, a bottom cover, a simulated casing, a simulated formation, a positioning steel cylinder, a piston cylinder, an inner piston, an outer piston and a floating support plate. The method includes: pouring cement slurry into the annular space between the simulated casing and the simulated formation; curing the cement slurry at a constant temperature and pressure; slowly increasing the pressure in the piston cavity, and moving the inner piston downward until the simulated casing is separated from the cement ring; continuing to increase the pressure in the piston cavity, and the outer piston moves downward under the push of the inner piston until the cement ring is separated from the simulated formation. The test process of the present invention is controllable, and the test results are consistent with the downhole environment, providing an important technical means for optimizing cement slurry performance and cementing process parameters, and further improving the cementing quality of oil and gas wells.
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