使用分布式光纤传感器的CO <sub>2</sub>地质存储的光学传感：从实验室到现场规模的演示,Energy & Fuels

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使用分布式光纤传感器的CO ₂地质存储的光学传感：从实验室到现场规模的演示
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-12-24 , DOI: 10.1021/acs.energyfuels.0c03925
Yankun Sun _{1,

2} , Ziqiu Xue _{1,

2} , Hyuck Park _{1,

2} , Tsutomu Hashimoto _{1,

2} , Yi Zhang _{1,

2}

Affiliation

首先提出了一种基于分布式布里渊-瑞利背散射的，采用分布式光纤传感（DFOS）技术的创新监测系统，用于测量从核心规模实验到现场测试的小应变曲线。砂岩样品的表面缠绕在一起并用一根单模光纤（SMF）和四个常规应变仪粘合。进行了初步的实验室实验，以证明该提议的混合DFOS系统的传感效果。实验室实验表明，通过SMF沿非均质Tako砂岩岩心表面测得的应变与常规应变仪吻合得很好，并且可以更好地跟踪注入的CO ₂战线。此外，这种新颖的基于DFOS的光缆已部署在井套管后方，用于检测实际300 m深的现场井中沿井深方向的影响区。现场测试表明，由注入的CO ₂引起的变形区域的范围已成功监控，并根据测得的原位应变曲线进行了量化。这种第一手的混合DFOS系统和实验室发现的结果可以通过在与地球地球能源相关的各种流体注入，储存和提取站点中提供实时的原位应变信号，来定量评估井眼-盖层的完整性。

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Optical Sensing of CO2 Geological Storage Using Distributed Fiber-Optic Sensor: From Laboratory to Field-Scale Demonstrations

An innovative monitoring system using distributed fiber optical sensing (DFOS) technology based on hybrid Brillouin–Rayleigh backscattering is first proposed to measure small strain profiles from core-scale experiments to field tests. The surface of a sandstone specimen is twined and glued with one single-mode fiber (SMF) as well as four conventional strain gauges. A preliminary laboratory experiment is implemented to testify to the sensing effectiveness of this proposed hybrid DFOS system. Laboratory experiments indicate that the measured strain via SMF along the heterogeneous Tako sandstone core surface coincides well with conventional strain gauges and better tracks injected CO₂ fronts. Moreover, this novel DFOS-based optical fiber cable has been deployed behind the well casing for detecting impacted zones along the well depth direction in an actual 300 m-deep field well. Field testing shows that the extent of the deformed zone induced by injected CO₂ is successfully monitored and quantified in terms of measured in situ strain profiles. This first-hand hybrid DFOS system and lab-field findings can quantitatively evaluate wellbore–caprock integrity by providing real-time in situ strain signals in various Earth geoenergy-related fluids injection, storage, and extraction sites.

更新日期：2021-01-07

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