Abstract Distributed Temperature Sensing (DTS) technology enables downhole temperature monitoring to study hydrogeological processes at unprecedentedly high frequency and spatial resolution. DTS has been widely applied in passive mode site investigations of groundwater flow, in‐well subsurface thermal property estimation. However, recent years have seen the further development use an active (A‐DTS) for which heat sources are deployed. A suite studies using A‐DTS illustrate wide range...

Abstract A new method of measuring dynamic strain in boreholes was used to record fracture displacement response head oscillation. Fiber optic distributed acoustic sensing (DAS) measure at mHz frequencies, rather than the Hz kHz frequencies typical for seismic and monitoring. cable mechanically coupled wall a borehole drilled into fractured crystalline bedrock. Oscillating hydraulic signals were applied companion 30 m away. The DAS instrument measured less 1 amplitudes nm, fluid pressure...

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A vibration-sensitive, Distributed Acoustic Sensor (DAS) array, using fiber-optic cables, was deployed in a triangularly shaped geometry on the frozen surface of Lake Mendota Madison, Wisconsin, USA. The purpose array and testing program to analyze DAS response utilize high spatial density distributed for system characterization well-constrained, small, array. geophone also provide reference system. design allowed us assess with respect distance from seismic sources, degradation length...

Measurement of interwell hydraulic interference is a fundamental method characterizing the permeability structure geothermal, carbon sequestration, and petroleum reservoirs. A new system pressure measurement demonstrated that utilizes fiber-optic cable. In laboratory, distributed acoustic sensing (DAS) was used to measure oscillating signals employed at mHz frequencies. DAS measures oscillatory strain rate along cable caused by changes. Pressure measured in water-filled reservoir subjected...

Geothermal reservoirs offer unique characterization challenges due to the harsh environment that downhole tools are subject and discrete spatially discontinuous hydrothermal features make up reservoir. Enhanced Systems (EGS) great potential for dramatically expanding use of geothermal energy by allowing development traditionally inaccessible thermal resources; thus, offering possibility significantly reduce carbon emissions combat anthropogenically induced climate change. However, EGS offers...

Fibre optic distributed temperature sensing (DTS) is used increasingly for environmental monitoring and subsurface characterization. Combined with heating of metal elements embedded within the fibre cable, response soil provides valuable information from which parameters such as thermal conductivity moisture can be derived at high spatial temporal resolution, over long distances. We present a novel active (A-DTS) system its application to characterize dynamics in along recently forested...

Advances in opto-electronics and associated signal processing have enabled the development of Distributed Acoustic Temperature Sensors. Unlike systems relying on discrete optical sensors a distributed system does not rely upon manufactured but utilises passive custom fibre cables resistant to harsh environments, including high temperature applications (600°C). The principle sensing is well known from sensor (DTS) which uses interaction source light with thermal vibrations (Raman scattering)...

Fiber optic distributed temperature sensing based on Raman scattering of light in optical fibers has become a very attractive solution for (DTS) applications. The scattered signal is independent strain within the fiber, enabling simple packaging solutions fiber sensors while simultaneously improving accuracy and robustness measurements due to lack strain-induced errors these measurements. Furthermore, increases magnitude at higher temperatures, resulting an improved SNR high Most DTS...

Summary Enhanced Geothermal Systems (EGS) offer unique monitoring and characterization challenges. The harsh, high temperature downhole environment heterogeneous nature of discrete hydraulic features usually governed by discontinuous fractures faults requires robust measurement technology with advanced resolution capability. Borehole DAS installations are often associated VSP surveys. However, tomographic seismic, earthquake seismology, microseismic applications have also been demonstrated...

Summary A large-scale carbon capture and storage (CCS) research project has been carried out by Battelle in cooperation with Core Energy LLC to evaluate the feasibility of sequestering CO2 into carbonate reef formations. The study area is located Otsego Country, Michigan, USA, where utilizes injection for enhanced oil recovery (EOR) Silurian pinnacle reefs. Novel monitoring tools such as distributing acoustic sensing (DAS) offer promise CCS operations, a time-lapse 4D DAS vertical seismic...

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Summary This presentation will outline a monitoring platform for Distributed Fibre Optic Sensing (DFOS) and current applications in CO2 sequestration monitoring. Case studies from active CCS projects analogous operations other industries be discussed.

Abstract Nigeria is Africa's biggest crude producer but its revenue severely reduced by theft and attacks on oil pipelines that significantly impacts production fuel supply. Substantial efforts have taken place in collaboration with local communities, producers operators to engage New Technologies a bid combat pipeline sabotage. Integrity monitoring of gas can quickly identify leak or third-party incursion event. Distributed optical fibre sensing offers system not available any other...

We present a study on the use of state-of-the-art distributed sensing systems to extract temperature and vibration information from existing single-mode, optical fibre infrastructure in Cyprus (~25-year-old installation); as means sensing. In this study, we have focused underground fibres Electricity Authority (EAC). The been selected be collocated with power distribution cables that are sited around Nicosia, for purpose monitoring cable joints prone failure, along general unusual behaviour...

Composite materials are vulnerable to damage, and this can result in conservatism design increased maintenance costs. One way of reducing these costs is by integrating a system into the composite material which sense damage condition provide an assessment its size, location significance. This difficult task, one main challenges develop sensor systems that detect reliably while not compromising properties or significantly increasing weight. A will be described fulfills some requirements. It...

Summary Fibre-optic Distributed Acoustic Sensing (DAS) offers the ability to record seismic waves with high density measurements in time and space, thus enabling a detailed analysis of subsurface structure waveform. The aim this study is compare suitability high-quality geophones fibre-optic cables for site characterisation potential nuclear waste repositories, using Forsmark Sweden as case study. Initial results walkaway vertical profile (VSP) survey are presented here data recorded on DAS...

Summary We present a near-surface application of monitoring using two types fibre optic measurements: Active Heating Distributed Temperature Sensing (AH-DTS) and Acoustic (DAS). performed infiltration extraction experiments in well field drinking water company. The goals the are testing suitability various methods acquiring knowledge about groundwater flow behaviour relation to clogging. AH-DTS data show that there is difference measured ΔT between situation no flow. will be converted...