Cement sheath strain detection tool and method of detection

By designing a cement sheath strain detection tool and combining it with a simulated wellbore device, a high-temperature and high-pressure curing system, and a strain measurement system, the problem of inaccurate cement sheath strain data measurement in existing technologies has been solved, enabling accurate stress state analysis under complex downhole conditions.

CN117739842BActive Publication Date: 2026-07-07CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2022-09-13
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing wellbore simulation devices cannot cure cement sheaths under pressure conditions, and the temperature or pressure conditions are removed during strain data measurement, resulting in inaccurate measurement results and an inability to truly simulate the stress state of cement sheaths under downhole temperature and pressure conditions.

Method used

Design a cement sheath strain testing tool, including a simulated wellbore device, a high-temperature and high-pressure curing system, and a strain measurement system. It can measure the strain state of the cement sheath in real time during the curing process and perform measurements without removing the pressure or temperature after curing. Data acquisition is performed using fiber optic measurement sensors.

Benefits of technology

It enables accurate measurement of cement sheath strain data under complex downhole conditions, improving the accuracy and efficiency of stress state analysis.

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Abstract

The embodiment of the present application provides a cement sheath strain detection tool and a cement sheath strain detection method, and belongs to the field of oil and gas exploration and development. The cement sheath strain detection tool comprises a simulated wellbore device, a high-temperature and high-pressure curing system and a strain measurement system. The high-temperature and high-pressure curing system is used for providing a curing environment and a measurement environment for the simulated wellbore device, and the strain measurement system is used for measuring the strain state of the cement sheath of the simulated wellbore device. The high-temperature and high-pressure curing system of the present application can provide a curing environment for the cement sheath, apply pressure and temperature to the cement sheath for curing, and realize real-time measurement of the strain data of the cement sheath during the curing process. Meanwhile, the high-temperature and high-pressure curing system also provides a measurement environment required by the loading process for the cement sheath, provides a pressure and temperature environment in the casing, realizes real-time measurement of the strain data of the cement sheath during the loading process, and can more accurately analyze the stress state of the cement sheath.
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