A method, system, and apparatus for monitoring lost circulation during under-reaming drilling

By acquiring the moving average and standard deviation of mud outlet flow rate in real time during choke drilling, the overflow and leakage early warning range is dynamically adjusted, solving the problems of untimely overflow and leakage monitoring and false or missed reports in choke drilling, and improving the accuracy of overflow and leakage monitoring and drilling safety.

CN122106438APending Publication Date: 2026-05-29CNPC GREATWALL DRILLING COMPANY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNPC GREATWALL DRILLING COMPANY
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing choke drilling operations, overflow and leakage monitoring methods suffer from untimely monitoring, low accuracy in measuring the total overflow and leakage, and fixed threshold early warning methods cannot be dynamically adjusted according to real-time data fluctuations, leading to a high possibility of missed or false alarms, which affects drilling safety.

Method used

The system acquires the instantaneous outlet flow rate of mud during the choke drilling process in real time, calculates the moving average and standard deviation through a time sliding window, dynamically adjusts the overflow and leakage warning interval, and judges in real time whether the flow difference meets the warning interval to issue an overflow and leakage warning.

Benefits of technology

It improves the accuracy and safety of overflow and leakage monitoring during choke drilling, reduces false alarms and missed alarms, and ensures timely response and safety in drilling operations.

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Abstract

The application discloses a kind of overflow leakage monitoring methods, systems and devices of throttling drilling.The method includes the instantaneous outlet flow of mud in the process of throttling drilling is acquired in real time, according to preset time sliding window, the moving average sequence of instantaneous outlet flow of current time is determined, and the moving standard deviation of instantaneous outlet flow of current time is determined based on moving average sequence;According to moving standard deviation, overflow leakage dynamic early warning interval is set;According to preset time sliding window, the difference of moving average of current time instantaneous outlet flow and the moving average of next time instantaneous outlet flow is determined;Difference is judged whether it accords with overflow leakage dynamic early warning interval.Can eliminate the influence of abnormal fluctuation of instantaneous outlet flow on overflow leakage early warning result, dynamically adjust the early warning interval of overflow leakage, and more timely and accurately carry out overflow leakage early warning in the process of throttling drilling.
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