A distributed optical fiber temperature measuring system for oil wells

Abstract

This paper introduces a distributed optical fiber temperature measurement system for oil well temperature profile measurement. By using reference light source to measure the loss of Raman scattering light in the optical fiber, the loss of optical signal propagation at each working wavelength in the distributed optical fiber temperature measurement system is acquired online, and the influence of optical fiber propagation loss caused by fiber optic cable stress concentration or damage on distributed optical fiber temperature measurement is corrected. A new distributed optical fiber temperature measurement system is built and temperature test is carried out. The experimental results show that the system can effectively compensate the Raman scattering light of the optical fiber and improve the adaptability and compatibility of the distributed optical fiber temperature measurement system to the optical cable. The system has the advantages of simple structure, high integration degree, low cost, wide applicability of optical cable, and practical engineering value.