油气田硫化氢气体浓度光纤消逝场传感检测技术  

Optical fiber evanescent sensing technology of hydrogen sulfide gas concentration in oil and gas fields

作　　者：唐东林[1] 柯志军[1,2] 代志勇[2] 窦春霞 贾品元 

机构地区：[1]西南石油大学机电工程学院石油天然气装备教育部重点实验室,四川成都610500 [2]电子科技大学光电信息学院光电传感与信息处理重点实验室,四川成都610054 [3]长江大学地球物理与石油资源学院,湖北武汉430100 [4]中国石油长庆油田公司第五采油厂,陕西西安710018

出　　处：《石油学报》2016年第1期106-110,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.41474142);石油天然气装备教育部重点实验室开放基金资助项目(OGE201402-04)资助

摘　　要：针对光纤消逝场硫化氢（H2S）气体浓度传感器存在的光源波动噪声、灵敏度低等问题,设计了双光路光谱吸收式检测系统,分析了消逝场光功率与气体浓度、检测灵敏度之间的关系,研究了光纤腐蚀过程中消逝场功率与光纤剩余直径之间的关系;研制消逝场功率比不同的传感光纤进行H2S气体浓度检测实验,探讨了小范围温度变化对气体浓度检测的影响。实验结果表明：当传感光纤消逝场功率比为10%时,灵敏度高达4.4W·L/mol,最低检测H2S气体浓度可达5.1×10-6,且温度在273~333 K范围内变化时对H2S气体浓度检测的影响很小。光纤消逝场传感器制作成本低、灵敏度高、精度高,可用于油气勘探开发过程中H2S气体的检测。Aiming at light source fluctuation noises,zero drift and other problems of H2 S gas concentration sensor in optic-fiber evanescent field,double-light-path absorption detection system was designed to theoretically analyze the relationship between evanescent-field luminous power and gas concentration as well as detection sensitivity.Moreover,the relationship between evanescent-field power and optical-fiber residual diameter in the optic fiber corrosion process was also studied.The sensing probes with different evanescent-field power ratios were used for detection experiments of H2 S gas concentration,so as to explore the influences of smallrange temperature variations on gas concentration detection.The experimental results show that when the evanescent-field power ratio of sensing probe is 10%,the sensitivity is up to 4.4 W·L/mol,the detected minimum H2 S gas concentration is 5.1×10-6,and the temperature of 273~333 K has little influences on H2 S gas concentration detection.Due to low production cost,high sensitivity and high accuracy,the optic-fiber evanescent-field sensor can be applied in measurement of H2 S gas during the hydrocarbon exploration and development process.

关 键 词：消逝场 光纤传感器 光谱吸收 差分检测 硫化氢气体浓度 

分 类 号：TE642[石油与天然气工程—油气加工工程]