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The use of optical fibers in the oil and gas industry is becoming more viable. However, poor long-term performance of fibers, especially hydrogen ingression problem at elevated temperature and pressure, is still an issue yet to be fully resolved. This is critically important in permanent reservoir monitoring, where wells operate in conditions of high temperatures in high pressures within a hydrogen-rich environment. This paper proposed high temperature and high pressure hydrogen ingression testing load hydrogen environment by using downhole commonly used different fiber (including high temperature fiber, carbon fiber, carbonhigh temperature coating fiber, pure silica core optical fiber) and different fiber cable structure, measuring the optical attenuation loss to simulate hydrogen permeation, the numerical simulation of optical fiber cable hydrogen ingression was carried out by optical fiber cable hydrogen, the mathematical model was corrected based on the experimental results, The corresponding relationship between the laboratory test results and the lifetime in the field downhole environment is determined. The research results of this paper provide theoretical reference for the selection of optical fiber and coating type and the design of optical fiber cable structure for downhole optical fiber monitoring.
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