optimising integrity and flow assurance through the use of
TRANSCRIPT
DEEPSEAMONITORING SOLUTIONS
DM
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Optimising Integrity and Flow Assurance Through the Use of
Intelligent Infrastructure
Ian WalkerDirector - Deepsea Monitoring Solutions
DEEPSEAMONITORING SOLUTIONS
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Traditional Approach to Monitoring of Subsea Umbilicals, Risers & Flowlines
� None!!
� Instead:
� Engineering possibly over-conservative based on established models � but not calibrated
� Creates higher CapEx� Generates inefficiencies � start up, downtime due to
routine maintenance� Operational Risks � premature failure
DEEPSEAMONITORING SOLUTIONS
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SMONITORING OF:
Flexible risersSCR�sRiser towersUmbilicalsMooring LinesPipe-in-PipeSubsea flowlinesBundles
BENEFITS:
Flow Assurance Integrity Assurance
Applications
DEEPSEAMONITORING SOLUTIONS
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Optical Fibre Sensors -the enabling technology
� Utilises intrinsic properties of fibre, not merely communicating of data.
� No electronics at sensor locations� High temperature performance >300ºC� Extremely small <500m� Intrinsic Safety� High reliability and stability� Immune to EMI� Distributed Sensors provide Complete Coverage� Long Range
DEEPSEAMONITORING SOLUTIONS
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SSensor Systems
Distributed
�Leakage Detection
Chemical
�Flow Assurance
�Leakage Detection
Pressure
�Identifying presence, location and magnitude of VIV�s, FIV�s
Vibration
�Leakage Detection
�Identify Flow Regime �eg Slugging
�Pressure�Curvature
�Fatigue
�Shape
�Position�Tension
�Degradation
�Flow Assurance
�Leakage Detection
Single Point, Multi-point & Distributed
Temperature AcousticStrain
DEEPSEAMONITORING SOLUTIONS
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SA Superior Approach to Monitoring
SystemRiser, pipeline,
well, etc.
Sensors
SystemModel
ControlSystem
Product out
Product in Current Design Practise(s)
Front end design
Detailed Design
Monitor
Analyse & Assess
Test � Comparison with design model
predictions
Modify design practise(s) & tools
New design approach/theory
developed
Production Benefits Long-Term Benefits
Alarms
DEEPSEAMONITORING SOLUTIONS
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STypical SURF Monitoring Scope
To gain maximum benefit from the installation of a monitoring system, it is likely to be a combination of a number of differing sensing systems, possibly combining different technologies � from different suppliers.
The next challenge is for data management, data analysis and interpretation to provide tools and solutions that offer through-life assurance of optimum performance and integrity.
DEEPSEAMONITORING SOLUTIONS
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SData to Knowledge
Data Acquisition� Certain parameters can provide direct output �
eg alarm functions for integrity breaches� Acquiring other data sets needs post processing
to generate Knowledge
Modelling and Analysis� Software tools exist for design/analysis for SURF
equipment, but are generally un-calibrated.� These tools are now being enhanced to take
new data sets to feedback. � Outputs from these processes would include
revised fatigue prediction, recommendations for maintenance or changes in operational performance.
DEEPSEAMONITORING SOLUTIONS
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SAreas of Application
� Early identification of hydrate formation� Start up management� Installation monitoring� Immediate assessment of impact of
hurricanes� Analysis of vibration effects� Strain and bending effects at critical points� Lateral and Upheaval Buckling� Integrity assurance
DEEPSEAMONITORING SOLUTIONS
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SExamples
� Strain monitoring � Insensys presentation
� Flow assurance � hydrate detection
� Integrity monitoring � gas
� Leakage detection - oil
DEEPSEAMONITORING SOLUTIONS
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SFlow Assurance
� Facility purposely established to generate hydrate deposits.
� >2000 metres long.� Instrumented with optical fibre sensors� Successfully identified where and when
hydrates start to form.
DEEPSEAMONITORING SOLUTIONS
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Leak Detection In Multiphase Pipeline
� Multiphase pipe carries gas and liquid phase so conventional mass balance leak-detection techniques not accurate - hence DTS technology proposed
� Mechanism involves monitoring pipeline temperature profile to detect cold spot at leak site due to JT effect
� Objective was to detect leakage of 0.2% mass flow of 160 bar methane at 300mscfd
� JT effect simulated by releasing nitrogen at 160Bar through 2.5mm diameter orifices in buried sample of 660mm dia pipe
DEEPSEAMONITORING SOLUTIONS
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Integrity Monitoring � Gas Pipelines
The leakage is identified after approx 10 minutes and the temperature continues to drop over the next hour. Also the cool zone extends in either direction along the pipeline.
DEEPSEAMONITORING SOLUTIONS
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Detection of Hydrocarbons
Activating fluid
OTDR
Sensor cable
Intensity
Length (km)
Reference trace
Microbending events appear as change in the signal trace Multiple events can readily be detected
DEEPSEAMONITORING SOLUTIONS
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SConclusions
It can be seen that the use of advanced sensor systems coupled with analytical modelling programmes will deliver new levels of information to provide:
operational savings, increased asset life, maintaining of production
Whilst:increasing reliability and minimising risk.