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Preliminary evaluation of a high-pressure, high-temperature downhole optical sensor

Fusiek, Grzegorz and Niewczas, Pawel and Burt, Graeme (2011) Preliminary evaluation of a high-pressure, high-temperature downhole optical sensor. In: Proceedings of the 2011 IEEE Sensors Conference. IEEE, New York, pp. 409-412. ISBN 9781424492909

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Abstract

This paper reports on the evaluation of a high-pressure high-temperature (HPHT) sensor prototype for permanent monitoring of pressure and temperature in oil wells. A Fabry-Perot (FP) pressure transducer was built using a metal capillary, metal reflecting wire and metal coated fiber which were brazed with a silver-based brazing paste using a specially designed induction heating system. The prototype sensor was tested for two outermost temperatures of the operating range of 20-350°C for which wavelength-pressure response characteristics were recorded for incremental pressure changes from 0 to 10,000psi. The results show that the sensor response to pressure was linear, with the nonlinearity error below 1%.