Technical Papers and Real-World Case Studies

Strain & Temperature Monitoring Using Rayleigh Backscatter Sensing

This paper focuses on the application of Rayleigh Backscatter Sensing to provide three measurement streams in parallel in real time from the same device: Distributed Acoustic Sensing (DAS), Rayleigh Distributed Temperature Sensing (RDTS) and Rayleigh Distributed Strain Sensing (RDSS).

The paper looks at a year of work with the British Geological Survey (BGS) at a National Landslide Laboratory in the UK.

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Machine Learning Delivers Railway Application Improvements

This paper examines the utilization of machine learning techniques to maximize the value from the improved data fidelity and reduce commissioning times provided by the latest long-range quantitative distributed fiber-optic sensing interrogator unit technology.

The paper also demonstrates how supervised ML techniques can be used to deliver a step-change improvement in the detection of rolling stock movements which enables a performance improvement across the rail monitoring solution portfolio.

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Hydraulic Induced Fracture Geometry in Hydraulic Fracture Site

This paper examines the dataset produced at the Hydraulic Fracture Test Site 2 (HFTS2) in the Permian Delaware Basin. HFTS2 was one of the most comprehensive multiwell fiber optic sensing projects. The paper discusses distributed sensing diagnostics (crosswell strain, das microseismic, injection and production monitoring) integrated with other technologies, modeling, validation and interpretation of a broad range of physical processes.

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Technical Comparison of Downhole Methods through Fiber Optic VSP

This paper presents a methodology for comparing conventional, primarily mechanically driven, detection sondes to the use of fiber optic cable via seismically generated sources through vertical seismic profiling (VSP). Ultimately we will demonstrate the two comparative methods, through the utilization of a hydraulic stimulation detection project.

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Velocity Tracking for Flow Monitoring and Production Profiling

This paper shares recent work that was done to understand how bulk flow rates and fluid composition may be derived in single-phase and multi-phase flow by tracking the slopes (velocities) of coherent features detected using Distributed Acoustic Sensing (DAS)

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Estimating Anisotropy Effects During Microseismic Monitoring

This paper shows a real data example where microseismic events were recorded using a 40 level array of 3-component downhole seismic sensors in an observation well straddling the treatment zone in depth. The observed microseismic event gathers exhibit shear wave splitting even at the onset of treatment operations due to anisotropy which was not readily predicted by either surface seismic or sonic scanner logs.

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Monitor Operations with Fiber-Optic Distributed Acoustic Sensing

This paper describes how DAS measures acoustic events and signatures related to a typical plug-and-perf hydraulic fracturing operation including: wireline gun tracking, perforating, bridge plug setting, ball drops, and injection (axial flow and flow through perforations).

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Cloud-Based Solution for Permanent Fiber-Optic DAS Monitoring

This paper presents the system architecture and details the lessons learnt in designing, commissioning and running a permanent DAS system including the extraction of low data rate, actionable, qualitative data from distributed fibre-optic sensors and the IT challenges of creating a reliable, permanently installed system.

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Flow Monitoring and Production Profiling using DAS

This paper discusses the application of DAS for flow monitoring. Specifically, it was found that DAS has potential for zonal production and injection allocation across ICVs, monitoring interzonal inflow from the reservoir, monitoring artificial lift, tracking fluid transport through the well bore, detecting leaks, and monitoring wax build up or other types of deposition in the well.

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Improve Wellbore Production Surveillance with Fiber Optic Sensing

This paper presents two recent examples of single-phase flow profiling using DAS. The first example is from a single-phase gas producer in one of the Unconventional plays in North America and the second example is from a long horizontal, smart polymer injector operated by Petroleum Development Oman (PDO).

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Fibre-Optic Distributed Acoustic Sensing Detect Gas Well Leaks

This paper describes DAS technology and how it is deployed as well as shows the analysis and results from a casing leak detection trial.

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Dual-Well 3D VSP in Deepwater Made Possible by DAS

This paper discusses the acquisition of a 3D Distributed Acoustic Sensing (DAS) VSP simultaneously in two injector wells in a deepwater field.

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