A real-time detection method for casing makeup state of a shale gas well

CN121901934BActive Publication Date: 2026-05-29CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Filing Date
2026-03-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies cannot effectively detect the casing connection status of shale gas wells in real time, resulting in insufficient wellbore air tightness and integrity, which increases the cost and safety risks of oil and gas extraction.

Method used

By analyzing the torque variation patterns in the slight interference section of the thread and the shoulder-top section during the casing threading process of shale gas wells, and using feature point and multi-feature analysis methods, the key torque points and curve variation characteristics are detected in real time, and abnormal threading status is identified and an early warning is issued.

Benefits of technology

It enables accurate identification and classification of the casing connection status of shale gas wells, reduces misjudgments and omissions, improves detection efficiency, ensures wellbore integrity and airtightness, and reduces the risk of production safety accidents.

✦ Generated by Eureka AI based on patent content.

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    Figure CN121901934B_ABST
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Abstract

The present application belongs to the technical field of electric digital data processing, and particularly relates to a shale gas well casing makeup state real-time detection method. The method is based on the torque change law of the slight interference section ab and the shoulder-to-top section bc in the special casing makeup process of the shale gas well, and the relative position relationship between the three torque change key points a, b and c and the four thresholds T_max, T_min, T_step_min and T_step_max, a single feature or multi-feature analysis method is established, and whether the torque key point and line change characteristics in the actual makeup torque curve are normal is analyzed in real time in the casing running construction process. If the makeup state is abnormal, it indicates that the shale gas well casing makeup construction does not meet the wellbore integrity requirements, the makeup needs to be terminated, and corrective measures are taken to re-run the casing, so as to ensure the shale gas well drilling wellbore airtightness and integrity.
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