Advancements in Tracer Flow Testing: Development of Real-Time Technology for Flow and Enthalpy Measurements

Abstract

The tracer flow testing (TFT) method for dual-phase flowrate and enthalpy measurements has become a standard diagnostic tool for geothermal reservoir engineering and power plant optimization. The need for lower tracer injection volumes, faster analysis, and smaller equipment has driven development of a modular, field-portable, flow measurement system. Now, discovery of a new fluorescent liquid-phase tracer and development of an automated analysis method for the existing vapor-phase tracer has made possible the delivery of enthalpy data on a real-time basis. The new liquid-phase tracer has the analytical sensitivity needed for direct-fluorescence measurements, a key component of the real-time process. A sample conditioning system for vapor-phase tracer analysis has eliminated the need to collect individual gas samples, and can now provide continuous analysis of vapor tracer during flow testing. The integration of these developments into existing tracer flow test methodologies has made it possible to acquire mass flow and enthalpy data on a real-time basis.