The invention relates to an optical fiber sensor for measuring downhole pressure, which is characterized by comprising a metal protection tube, metal protection tube is provided with a fixed end of the pressure of the entrance, the other end is provided with fiber sealing hole; metal protection tube is arranged in the outer layer of a metal tube, an outer metal tube wearing a metal inner tube, one end of the two metal pipes are connected with the fixed end, and the inner metal tube is communicated with the other end of the entrance pressure; the outer metal tube is provided with a pigtail pigtail fixed seat fixed seat penetrated and fixed with a pigtail; the other end of the inner metal tube is provided with a pressure cavity end plug the pressure cavity end plug, and the tail in the same horizontal line position penetrates and is fixed with a signal transmission fiber, a Fapachamber formed between the end of the signal transmission and optical fiber pigtail; signal transmission The other end of the outer sleeve is provided with optical fiber cable outer armor, with cable outer armor piercing signal transmission fiber fiber hole through the sealing fastening device and fiber hole sealing fastening, connecting the demodulation equipment.
【技术实现步骤摘要】
【技术保护点】
１．一种测量井下压力的光纤传感器，其特征在于：它包括一金属保护管，所述金属保护管的一端为固定端，其上设置有一压力入口，所述金属保护管的另一端为密封端，其上设置有一光纤引出孔；所述金属保护管内设置有一外层金属管，所述外层金属管内穿设有一内层金属管，所述外层金属管和内层金属管的一端均连接所述固定端，且所述内层金属管的内腔与所述压力入口连通；所述外层金属管的另一端设置有尾纤固定座，所述尾纤固定座上穿设固定有一尾纤；所述内层金属管的另一端设置有压力空腔端堵，所述压力空腔端堵上、与所述尾纤在同一水平线的位置穿设固定有一信号传输光纤，所述信号传输光纤的端部与所述尾纤的端部之间具有一定距...
【技术特征摘要】
【专利技术属性】
技术研发人员：孙福街，黄正宇，曹砚锋，文进，靳勇，徐相涛，
申请(专利权)人：中国海洋石油总公司，中海石油研究中心，北京蔚蓝仕科技有限公司，
类型：发明
国别省市：11
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