【摘要】 用于井下永久性测量的光纤传感器,由于在高温高压等恶劣环境下会与井下物质发生各种反应从而引起光纤吸收损耗的增加。为了掌握井下永久性测量用光纤吸收损耗的增加情况,本文针对影响光纤吸收损耗的重要因素?氢与光纤的物理及化学反应进行了研究,分析了其影响机理,讨论了其对光纤测量性能及使用寿命的影响,仿真计算了氢与光纤发生的各种反应所导致的光纤吸收损耗的增加情况,得到了化学反应引起的吸收损耗增加是影响永久测量性能的主要因素的结论,并由此给出了有效减少氢对光纤井下永久测量影响的预防措施。更多还原

【Abstract】 Optical fibers react with kinds of materials in high temperature and high pressure conditions downhole, which results in absorption loss increase of the optical fibers in the sensors used for permanent measurement downhole. Hydrogen which is a very important factor in optical fiber absorption loss increase was studied in this paper to understand the situation how optical fiber absorption loss increases in permanent measuring sensors downhole. Physical and chemical reactions between hydrogen and optical fiber were studied, and the mechanism of absorption loss increase was also analyzed. Measuring performance changes of fiber sensors and lifetime decrease caused by hydrogen were discussed. Reaction situations were simulated. The simulative results come to a conclusion that the absorption loss increase caused by chemical reaction is major factor in permanent downhole measurement. And effective measures were put forward to protect optical fiber from hydrogen.更多还原