Efficient localization method of lost circulation zone based on dynamic temperature response

Current techniques for localizing drilling fluid lost circulation zones frequently suffer from limited accuracy and delayed responsiveness. This paper proposes an innovative approach for localizing lost circulation zones based on dynamic temperature response characteristics. The methodology is grounded in the principle of energy conservation and utilizes a wellbore–formation transient heat transfer model specifically adapted for lost circulation scenarios. Second, by integrating distributed temperature sensing field measurements with numerical simulation results, the temporal evolution of outlet and bottomhole temperatures is reconstructed. A dual-source constraint criterion is introduced to enable rapid and precise localization of lost circulation zones. Model validation under actual wellbore conditions indicates that the predicted outlet and bottomhole temperatures deviate by less than 2% from measured values. Furthermore, sensitivity analyses indicate that critical parameters, including circulation time, loss rate, and loss location significantly affect the wellbore temperature evolution, confirming the effectiveness of temperature response in characterizing lost circulation behavior. In comparison to conventional methods, the proposed approach not only significantly improves timeliness and accuracy but also enhances the reliability and field applicability of lost circulation zone localization, thereby providing a robust theoretical foundation and practical strategy for mitigating well control risks and ensuring safe, efficient drilling in deep and geologically complex formations.