Waveguide-based ultrasonic and far-field electromagnetic sensors for downhole reservoir characterization.

[摘要] This report summarizes the first year research and development effort leading to development of high-temperature sensors for enhanced geothermal systems. It covers evaluation of ultrasonic and electromagnetic (EM) techniques applied to temperature measurement and flow characterization. On temperature measurement, we have evaluated both microwave radiometry and ultrasonic techniques for temperature gradient and profile measurements. Different antenna designs are evaluated and array loop antenna design is selected for further development. We have also evaluated ultrasonic techniques for total flow characterization, which includes using speed of sound to determine flow temperature, measuring acoustic impedance to estimate fluid density, and using cross-correlation technique to determine the mass flow rate. Method to estimate the flow enthalpy is briefly discussed. At end, the need and proposed techniques to characterize the porosity and permeability of a hot dry rock resource are presented.

[发布日期] 2010-11-12

[学科分类] 再生能源与代替技术

[关键词] ACOUSTICS;ANTENNAS;DESIGN;ENTHALPY;EVALUATION;FLOW RATE;GEOTHERMAL SYSTEMS;IMPEDANCE;PERMEABILITY;POROSITY;TEMPERATURE GRADIENTS;TEMPERATURE MEASUREMENT;ULTRASONIC WAVES;VELOCITY