油气井下光纤光栅温度压力传感器 -

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油气井下光纤光栅温度压力传感器

doi:10.37188/CO.2021-0008

1.
吉林大学电子科学与工程学院集成光电子国家重点实验室，吉林长春 130012
2.
中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室，吉林长春 130033

基金项目:国家自然科学基金项目(No. 91860140，No. 61874119，No. 61905244)；吉林省科技发展规划项目(No. 20180201014GX)

详细信息

作者简介:
薛兆康（1994—），男，山东聊城人，硕士研究生，2017年于潍坊学院获得学士学位，现为吉林大学电子科学与工程学院硕士研究生，主要从事光纤传感方面的研究。E-mail：2280825310@qq.com
于永森（1974—），男，吉林长春人，博士，教授，博士生导师，2005年于吉林大学获得博士学位，主要从事光纤传感，微纳加工研究。E-mail:yuys@jlu.edu.cn

中图分类号:TN253
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出版历程
- 收稿日期:2021-01-14
- 修回日期:2021-02-22
- 网络出版日期:2021-05-15
- 刊出日期:2021-09-18

Fiber bragg grating temperature and pressure sensor for oil and gas well

1.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2.
State Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Funds:Supported by National Natural Science Foundation of China (No. 91860140, No. 61874119，No. 61905244); Science and Technology Development Project of Jilin Province (No. 20180201014GX)

More Information

Corresponding author:yuys@jlu.edu.cn

摘要

摘要:温度和压力是石油开采过程中重要的参数，但油气井下高温高压环境苛刻，传统电子传感器很难实现长期稳定的工作。本文提出了一种基于碳纤维管增敏型的光纤光栅温度压力传感器。该传感器是以碳纤维丝编织成的中空管状结构作为骨架，通过耐高温环氧树脂固化成复合碳纤维管作为弹性体，并将表面嵌入耐高温光纤布拉格光栅作为感知元件，实现了井下温度和压力的同时测量。实验结果表明，该传感器可以在0~150 ℃和0~80 MPa环境下稳定工作，压力灵敏度最大可达到−50.02 pm/MPa，同时表现出很好的线性响应。通过外加参考光栅作为温度补偿光栅，解决了温度和压力同时测量过程中的交叉敏感问题，满足了井下开采过程中的精度要求，为油气井下高温高压光纤传感器的设计提供了实验依据。
- 油气井/
- 碳纤维管/
- 光纤布拉格光栅/
- 压力传感器
Abstract:Temperature and pressure are very important parameters in oil and gas well exploitation. The downhole environment is harsh so it is difficult for traditional electronic sensors to achieve long-term and stable monitoring of downhole parameters. In this paper, a fiber Bragg grating temperature and pressure sensor based on a carbon-fiber sensitized tube is proposed. The sensor is composed of a hollow tubular structure woven of carbon fibers as a skeleton. The composite carbon fiber tubes are cured by high-temperature resistant epoxy resin as an elastomer, and the high-temperature resistant fiber Bragg grating is embedded on the surface as a sensing element to realize the simultaneous measurement of downhole temperature and pressure. The experimental results show that the sensor can work stably in environments of 0~150 ℃ and 0~80 MPa, and the maximum pressure sensitivity can reach −50.02 pm/MPa. The sensor has a good linear response. By adding a reference grating as a temperature compensation grating, the cross-sensitivity problem in the process of the simultaneous measurement of temperature and pressure is solved, and the accuracy requirements in the process of underground mining are met. This technique provides an experimental basis for the design of high-temperature and high-pressure optical fiber sensors in oil and gas wells.
- oil and gas well/
- carbon fiber tube/
- fiber bragg grating/
- pressure sensor

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图 1(a)光纤温度压力传感器封装示意图和(b)封装后的器件图

Figure 1.(a) Schematic diagram of optical fiber temperature and pressure sensor packaging and (b) device diagram after packaging

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图 2三维四向法编织碳纤维管受压力情况仿真图

Figure 2.Pressure simulation diagrams of carbon fiber tube prepared by three-dimensional four-way method

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图 3光纤温度压力传感器测试装置图

Figure 3.Test device diagram of optical fiber temperature and pressure sensor

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图 4传感器两种光栅的谐振波长与温度拟合曲线

Figure 4.Fitting curve of the relationship between resonant wavelengths and temperature for two different gratings in the sensor

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图 5室温（23 ℃）下传感器的谐振波长与压力拟合曲线

Figure 5.Fitting curve for resonant wavelength and pressure at room temperature (23 ℃)

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图 6不同温度下传感光栅的谐振波长与压力拟合曲线

Figure 6.Fitting curve for resonant wavelength and pressure at different temperatures

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图 7光纤压力传感器稳定性测试

Figure 7.Stability test of optical fiber pressure sensor

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表 1传感光栅在不同温度下的压力响应灵敏度

Table 1.Pressure response sensitivity of sensing grating at different temperatures

Temperature/℃	23	30	40	50	60	70	80	90	100	110	120	130	140	150
Sensitivity/(pm/MPa)	−28.18	−28.65	−29.03	−29.55	−29.87	−30.01	−30.36	−30.55	−30.91	−31.89	−38.53	−43.49	−47.56	−50.02

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