The Design, Performance, and Field Test Results of a Sourceless Multiphase Flowmeter

Abstract The paper discusses recent advancements in phase fraction and flow rate measurement using a microwave-based non-gamma venturi multiphase flowmeter. The primary objectives are to assess measurement performance, system robustness, and usability in various flow loop and field conditions. The system combines microwave transmission antennas, a Venturi and a Multi-Variable Transmitter (MVT) to measure water-liquid ratio, gas volume fraction and flow rates of each phase together with a microware reflection antenna to provide measurement of salinity. More than 1,000 points were collected during an initial flow loop test campaign to assess the meter's performance in measuring liquid and gas flow rates, water-liquid ratio, and pressure loss, among other parameters. Several systems were deployed in multiple locations to test operational reliability and robustness of the tool. Field tests involved comparing results with radioactive multiphase flowmeter references, assessing calibration requirements, and evaluating system usability. The system can accurately determine water properties in varying salinities without requiring in-situ water reference measurement. Additionally, no in-situ oil reference measurement is required to achieve metrological performance within target tolerances for flow with oil of different viscosity or types, across the water-liquid ratio inversion point. The field tests demonstrated mechanical robustness and accurate performance of the system. Measurement uncertainty within acceptance criteria was successfully demonstrated on multiple wells. The system's usability was highlighted by its ease of configuration and maintenance, outperforming the reference multiphase flowmeter. The system’s ability to measure water-liquid ratio and gas volume fraction accurately was validated, providing reliable data for oil, water, and gas phase flow rates. This paper presents a novel approach to multiphase flow measurement using microwave technology, eliminating the need for gamma-ray sources. Such a system offers a safer and more efficient alternative to perform multiphase flow measurements for a wide range of applications with less human intervention.