Research of BOTDR on Dike Strain Monitoring

Zhang, Qing Ming; Peng, Zhu; Wang, Shao Li; Leng, Yuan Bao

doi:10.4028/www.scientific.net/amm.36.187

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…The experiment suggested the feasibility of collapse early detection. In the years following, other authors then claimed the feasibility of Brillouin strain sensing for embankment monitoring [148][149][150].…”

Section: Distributed Strain Sensing For Soil Levees and Embankmentsmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

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Section: Distributed Strain Sensing For Soil Levees and Embankmentsmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Comparison of Gas Signature and Void Fraction in Water- and Oil-Based Muds Using Fiber-Optic Distributed Acoustic Sensor, Distributed Temperature Sensor, and Distributed Strain Sensor

Adeyemi,

Wei,

Sharma

et al. 2024

SPE Journal

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Summary Accurate estimation and prediction of gas rise velocity, length of the gas influx region, and void fraction are important for optimal gas kick removal, riser gas management, and well control planning. These parameters are also essential in monitoring and characterization of multiphase flow. However, gas dynamics in non-Newtonian fluids, such as drilling mud, which is essential for gas influx control, are poorly understood due to the inability to create full-scale annular flow conditions that approximate the conditions observed in the field. This results in a lack of understanding and poor prediction of gas kick behavior in the field. To bridge this gap, we use distributed fiber-optic sensors (DFOS) for real-time estimation of gas rise velocity, void fraction, and influx length in water and oil-based mud (OBM) at the well scale. DFOS can overcome a major limitation of downhole gauges and logging tools by enabling the in-situ monitoring of dynamic events simultaneously across the entire wellbore. This study is the first well-scale deployment of distributed acoustic sensor (DAS), distributed temperature sensor (DTS), and distributed strain sensor (DSS) for investigation of gas behavior in water and OBM. Gas void fraction, migration velocities, and gas influx lengths were analyzed across a 5,163-ft-deep wellbore for multiphase experiments conducted with nitrogen in water and nitrogen in synthetic-based mud, at similar operating conditions. An improved transient drift flux–based numerical model was developed to simulate the experimental processes and understand the gas dynamics in different wellbore fluid environments. The gas velocities, void fractions, and gas influx lengths estimated independently using DAS, DTS, and DSS showed good agreement with the simulation results, as well as the downhole gauge analysis.

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Distributed fiber optics strain sensors: from long to short distance

Blanc¹,

Schenato²,

Molardi³

et al. 2022

Comptes Rendus. Géoscience

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Developed for more than forty years, optical fibers have features that make them particularly attractive for making sensors. One of the strengths of these sensors is that they can measure different physical parameters in a distributed manner over a wide range of lengths (from a few cm up to tens of kilometers) with a spatial resolution ranging from millimeters to meters. In this article, we are particularly interested in distributed fiber sensors, mainly based on light scattering processes, for measuring strain variations. This review concerns both applications requiring long lengths of fiber in a geological context, as well as those using length less than one meter for the medical sector. While distributed fiber optics sensors have already shown their great potential for long-range applications, short-range applications are a niche sector emerging in the last few years.Résumé. Développées depuis plus de quarante ans, les fibres optiques présentent des caractéristiques qui les rendent particulièrement attractives pour la réalisation de capteurs. L'un des points forts de ces capteurs est qu'ils peuvent mesurer différents paramètres physiques de manière distribuée sur une large gamme de longueurs (de quelques cm à des dizaines de kilomètres) avec une résolution spatiale allant du millimètre au mètre. Dans cet article, nous nous intéressons particulièrement aux capteurs

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Research of BOTDR on Dike Strain Monitoring

Cited by 4 publications

References 1 publication

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

Comparison of Gas Signature and Void Fraction in Water- and Oil-Based Muds Using Fiber-Optic Distributed Acoustic Sensor, Distributed Temperature Sensor, and Distributed Strain Sensor

Distributed fiber optics strain sensors: from long to short distance

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