Enhanced pressure sensitivity of side-hole fiber bragg grating sensor for downhole pressure and temperature measurement

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-05-12 DOI:10.1016/j.sna.2025.116692

Lei Liang , Yipan Cao , Ke Jiang , Xiaoling Tong , Hui Wang , Shu Dai

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Abstract

Downhole pressure and temperature measurement is a critical component of intelligent well completion. Side-hole fiber Bragg gratings can facilitate dual-parameter measurement of temperature and pressure due to their stress birefringence characteristics. However, the inherent low pressure sensitivity of side hole fiber grating poses challenges for effective downhole measurements. This paper proposes a polyurethane side hole external encapsulation sensitization structure to enhance the birefringence effect of side hole fiber. We utilized finite element theory to investigate the influence of sensitization structural parameters on the fiber's birefringence effect. Through the implementation of a response surface optimization design method, the optimized sensor attained a pressure sensitivity of 202.41 pm/MPa and a temperature sensitivity of 34.627 pm/°C. Relative to the bare side hole fiber, the pressure sensitivity experienced an enhancement by a magnitude of 18, while the temperature sensitivity witnessed a tripling effect. And the measurement ranges of the sensor for temperature and pressure are 0–100°C and 0–40 MPa, respectively. Measurements taken at an approximate depth of 1500 m demonstrate that the sensor can endure the high-temperature and high-pressure conditions downhole, laying a technical foundation for all-fiber temperature and pressure monitoring in intelligent well completion.

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提高了侧孔光纤光栅传感器的压力灵敏度，用于井下压力和温度测量

井下压力和温度测量是智能完井的关键组成部分。侧孔光纤布拉格光栅由于其应力双折射特性，可以实现温度和压力的双参数测量。然而，侧孔光纤光栅固有的低压力灵敏度给有效的井下测量带来了挑战。为了增强侧孔光纤的双折射效果，本文提出了一种聚氨酯侧孔外封装增敏结构。利用有限元理论研究了增感结构参数对光纤双折射效应的影响。通过实施响应面优化设计方法，优化后的传感器压力灵敏度为202.41 pm/MPa，温度灵敏度为34.627 pm/°C。与裸侧孔光纤相比，压力灵敏度提高了18个数量级，温度灵敏度提高了3倍。温度和压力传感器的测量范围分别为0 ~ 100℃和0 ~ 40 MPa。在大约1500 m的深度进行的测量表明，该传感器可以承受井下高温高压条件，为智能完井的全光纤温度和压力监测奠定了技术基础。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...