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Subsea Asset Monitoring usingDistributed Fiber Optic SensingCarlos BordaOmnisens S.A.Subsea Asia ConferenceJune 2014 Omnisens 2014
AgendaWho is Omnisens?Distributed Fiber Optic MonitoringPower UmbilicalsFlow Assurance (Heated Flowlines)Direct Electrical Heating (DEH)Indirect Heating (PiP) Omnisens 2014
Corporate OverviewOmnisens is a world leader in high performance fiber optic monitoring.Our fiber-optic solutions help organizations protect critical resources andavoid the escalating consequences of delayed incident detectionprotecting people, places and reputations along the way.Privately-owned Swiss company, established in 1999Spin-off from Swiss Federal Institute of Technology inLausanne (EPFL)Headquarters in Morges, SwitzerlandOffices in USA and BrazilHighly educated teamWorldwide customer baseDistributors/Integrators in:South AmericaAsia (Malaysia)Middle EastRussiaEuropeAfrica Omnisens 20143
Broad Range Of CapabilitiesEngineering and designProject managementProcurementManufacturingSystems integration and testingInstallation and commissioningOffshore interventionService, support and trainingSoftware design and licensingOmnisens operates according to the followingindustry standards:ISO 9001ISO 14001OHSAS 18001Omnisens is certified by Achilles Omnisens 20144
Industries served Omnisens 2014
Our TechnologyA fiber optic distributed sensing system with capabilities that areconsiderably ahead of the marketTurning optical fibers into fully distributed sensorsOne interrogator connected.to one fiber to monitorthousands of locationsLocal temperature orstrain Omnisens 20146
The physics behind themonitoringScattering processesLaser, lo Omnisens 2014Page 7
Sensing Technology 1/2ScatteringmediumLaser, loScattering processes usedfor sensing applications:RayleighDetects loss variations(OTDR and Fault location)RamanScattered magnitude istemperature dependentBrillouinScattered frequency istemperature and strainsensitive (leakage, groundmovement, deformation) Omnisens 20148
The physics behind the monitoringScattering analysis applied to sensing applicationsBrillouin lines are temperature and strain sensitiveRayleigh detects loss variations (OTDR and fault location)T, e changes in the fiber introduce frequencychanges of Brillouin scattered light Omnisens 2014
Sensing Technology 2/2FrequencyDomainTimeDomainThe activating signal isa propagating pulse andthe position is given bythe time of flight.Spatial resolution is givenby the pulse width.andThe frequency shift iscomputed by recording theBrillouin spectrum at differentfrequencies and extractingthe maximum peak location.Time domain analysis Omnisens 201410
Why monitor Power Umbilicals? Omnisens 201411
Umbilical : Sensor Design and Integration Omnisens 201412
Dynamic bending6 days Flex fatiguetest- no power Omnisens 201413
Bending strain monitoringInstrumented power umbilicalMonitoring ofBending, tension, torsion strainTemperatureStrain/Temp Sensing Cable Omnisens 201414
Condition monitoringPower Umbilical – OffshoreAustraliaHow would the umbilical respondto the increased load imposed bynew pumps?Successful temperaturemeasurement during operation,despite:Attenuation: 17 dBhigh reflexing peak of 13 dBFiber optic rotary joint Omnisens 201415
Flowline - Flow assurance solutionsDirect ElectricalHeating DEHFlowline bundles Omnisens 2014ElectricallyHeated Pipe inPipe16
What does monitoring offer? Omnisens 201417
Heated Pipe-in-Pipe (ETH-PiP)The Challengeto maintain temperatureabove a critical thresholdduring long shut down andstart-up periods. Omnisens 2014
Heated Pipe-in-Pipe (ETH-PiP)The SolutionFully Distributed Sensing:provides the temperature of theheated elementshelps optimise the heating withrespect to the targeted pipelinetemperature Omnisens 2014
Temperatures measured during first ETH-PiPheating and coolingPipe elevation profilePipe temperature profiles Omnisens 201420
Chemical injection points Omnisens 201421
Direct Electrical Heated Cable System Some 5 installations with up to 44 km DEH subsea flowlinemonitored, including with riser and feeder cable Omnisens 2014
Temperature profile example from one project Omnisens 201423
Profiles during DEH cable energization Omnisens 2014
SummarySubsea Umbilical Riser andFlowline (SURF) monitoring Flow assurance – temperature evolution andalerts with location for flowlines, pipelinesLeak detection and location in flowlines,umbilicals, risers.Umbilical fatigue (strain) and condition(temperature and strain) monitoringValidation of design and operation modelsHeating control for DEH and ETH-PiP flowline, Closed loop, real time feedback Overheat detection Heating performanceDamage warning thanks to fiber optic breakdetection for subsea structure integrity. Omnisens 201425
Leak detection and location in flowlines, umbilicals, risers. Umbilical fatigue (strain) and condition (temperature and strain) monitoring Validation of design and operation models Heating control for DEH and ETH-PiP flowline, Closed loop, real time feedback Overheat detection Heating performance Damage warning thanks to fiber optic .
