Strain Sensing for External Corrosion Detection for Onshore Exposed Flowlines

  • Mohammad Abu Zant

Student thesis: Master's Thesis

Abstract

With the increasing demand on energy resources, oil and gas is considered one of the most important energy resource in the middle east and the world. Utilizing such important energy always comes with the utilization of new technologies that will increase the efficiency of production. The production of oil and gas goes through multi stages, the most crucial stage is when the oil is being transported from through flowlines. With transportation through flowlines emerges a system of integrity and health of pipelines. Particularly, the external corrosion at the surface of the pipeline. If corrosion was not detected early, it will impose various safety effects on the site, not to mention the production interruption which will lead to decrease in production efficiency. In this thesis, the problem of external corrosion for exposed onshore flowlines is addressed. Additionally, the need of real time monitoring system for corrosion is identified. First, a corrosion detection sensor was proposed utilizing the use of optical Fiber Bragg Gratings (FBG). The proposed sensor depends on the ability of FBG to measure strain and on its wavelength change as a reaction to resulting strain. Second, six different method were introduced to implement FBG into a corrosion detection sensor. Furthermore, two of the six mentioned methods (Method V and Method VI) were analyzed thoroughly in this thesis. Method V was discussed through an L8 Taguchi analysis after consideration of seven design parameters. On the other hand, Method VI was discussed through detailed theoretical data from a developed FE model. Additionally, a prototype of the corrosion detection sensor was built and tested in an experimental setup. Both theoretical and experimental results were compared and showed matching model with an acceptable range of error of 6%-16%. The corrosion detection sensor was able to detect a maximum strain of 1000 _' and 2 nm change of wavelength.
Date of AwardDec 2020
Original languageAmerican English

Keywords

  • Fiber Bragg Grating
  • Optical Fiber
  • External Corrosion
  • Corrosion Sensor.

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