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

doi:10.7623/syxb201601010

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (1): 106-110.DOI: 10.7623/syxb201601010

• Petroleum Engineering • Previous Articles Next Articles

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

Tang Donglin¹, Ke Zhijun^1,2, Dai Zhiyong², Dou Chunxia³, Jia Pinyuan⁴

1. Key Laboratory of Petroleum-Gas Equipments of Education Ministry, College of Mechanical and Electrical Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Key laboratory of Optoelectronic Sensing and Information Processing, College of Optoelectronic Information, University of Electronic Science and Technology of China, Sichuan Chengdu 610054, China;
3. College of Geophysics and Petroleum Resources, Yangtze University, Hubei Wuhan 430100, China;
4. Fifth Oil Production Plant, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China

Received:2015-07-19 Revised:2015-12-05 Online:2016-01-25 Published:2016-02-02

油气田硫化氢气体浓度光纤消逝场传感检测技术

唐东林¹, 柯志军^1,2, 代志勇², 窦春霞³, 贾品元⁴

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

通讯作者: 唐东林,男,1970年11月生,1995年获大庆石油学院学士学位,2006年获天津大学博士学位,现为西南石油大学教授、硕士生导师,主要从事无损检测与光纤传感技术方面的研究。Email:tdl840451816@163.com
作者简介:唐东林,男,1970年11月生,1995年获大庆石油学院学士学位,2006年获天津大学博士学位,现为西南石油大学教授、硕士生导师,主要从事无损检测与光纤传感技术方面的研究。Email:tdl840451816@163.com
基金资助:
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。

Abstract

Abstract:

Aiming at light source fluctuation noises,zero drift and other problems of H₂S 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 H₂S gas concentration,so as to explore the influences of small-range 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 H₂S gas concentration is 5.1×10^-6,and the temperature of 273~333 K has little influences on H₂S 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 H₂S gas during the hydrocarbon exploration and development process.

Key words: evanescent field, fiber optic sensor, spectral absorption, differential detection, hydrogen sulfide gas concentration

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。

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

CLC Number:

TE642

Tang Donglin, Ke Zhijun, Dai Zhiyong, Dou Chunxia, Jia Pinyuan. Optical fiber evanescent sensing technology of hydrogen sulfide gas concentration in oil and gas fields[J]. Acta Petrolei Sinica, 2016, 37(1): 106-110.

唐东林, 柯志军, 代志勇, 窦春霞, 贾品元. 油气田硫化氢气体浓度光纤消逝场传感检测技术[J]. 石油学报, 2016, 37(1): 106-110.

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

油气田硫化氢气体浓度光纤消逝场传感检测技术

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