Abstract
A passive surface acoustic wave (SAW) pressure sensor was developed for real-time pressure monitoring in downhole application. The passive pressure sensor consists of a SAW resonator, which is attached to a circular metal diaphragm used as a pressure transducer. While the membrane deflects as a function of pressure applied, the frequency response changes due to the variation of the SAW propagation parameters. The sensitivity and linearity of the SAW pressure sensor were measured to be 8.3 kHz/bar and 0.999, respectively. The experimental results were validated with a hybrid analytical–numerical analysis. The good results combined with the robust design and packaging for harsh environment demonstrated it to be a promising sensor for industrial applications.
Highlights
Throughout the last few decades, the use of permanent well monitoring systems has been experiencing a remarkable growth in the oil and gas industry [1]
Other authors have already demonstrated the applicability of pressure sensors based on surface acoustic wave (SAW)
Other resonators; authors have already theof applicability pressure sensors based on SAW
Summary
Throughout the last few decades, the use of permanent well monitoring systems has been experiencing a remarkable growth in the oil and gas industry [1]. Information such as downhole pressure and temperature are valuable in order to optimize production and help in identifying or avoiding problems that may lead to an undesired shut-down of an oil well. For a long time technologies based on quartz crystals and fiber optics have dominated the market for downhole pressure gauges. Both require the use of downhole cables (electrical or optical), which increases the cost of the monitoring solution. This paper presents a passive SAW-based pressure sensor developed for these applications
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