Clamp-On Real-Time Wellhead Monitoring for Flow Behavior Characterization

This paper focuses on the use of real-time, clamp-on Electromagnetic Acoustic Transducer (EMAT) measurements at the wellhead to directly monitor real-time, actual well behavior. By capturing high-resolution flow data upstream of separation, we can observe how the well responds dynamically to different operational scenarios, particularly when routed to test separators versus flowing into the bulk line. These real-time measurements reveal systematic changes in flow regime, production rate, and transient behavior depending on downstream backpressure and flow path configuration. Understanding these variations allows for a more accurate assessment of actual well performance, independent of separator lag or test facility constraints, and supports improved production optimization in unconventional assets. The EMAT clamp-on sensor was deployed at the wellhead to capture real-time multiphase flow data across various operational states, with a focus on transitions between test separator routing and flow into the bulk line. Sensor configuration accounted for pipe geometry, fluid properties (PVT), and historical production data to ensure accurate signal interpretation. Measurements were conducted across multiple wells and compared against downstream test data. Particular attention was given to identifying systematic changes in flow dynamics such as shifts in phase behavior, transient responses, and production rates associated with varying the test configuration of the well. These observations were analyzed using multiphase flow models (e.g., Taitel-Dukler, TUFFP) to contextualize real-time signals within expected flow regimes and diagnose operational influences on observed well performance. Real-time wellhead data captured by the EMAT system revealed consistent and measurable changes in well behavior depending on whether the well flow was directed to a test separator or the bulk line. Transient analysis showed distinct shifts in flow regime during routing transitions, highlighting the impact of downstream backpressure and infrastructure configuration on apparent well performance. These differences were not immediately evident in downstream measurements due to system lag, averaging effects and limitations of conventional separator measurements. This capability supports improved lift performance assessment, better production allocation, and more responsive optimization strategies in dynamic field environments. This work demonstrates the unique value of real-time, non-intrusive wellhead measurements in uncovering the true behavior of unconventional wells under varying operational conditions. The system can be also deployed on conventional wells. By capturing transient flow dynamics independent of downstream infrastructure effects, the EMAT system provides a more accurate, high-resolution view of well performance. This capability enables operators to detect and interpret systematic changes when transitioning between test and bulk flow, allowing for more precise diagnostics, improved production allocation, and faster response to evolving well conditions. The approach offers a practical and scalable method to enhance surveillance and optimization strategies across diverse field settings.