E2 - Magne Husebo ESubsea Profilers - Control and ... - Magne Husebo ESubsea Profilers.pdf ·...
Transcript of E2 - Magne Husebo ESubsea Profilers - Control and ... - Magne Husebo ESubsea Profilers.pdf ·...
Subsea ProfilersControl and Monitoring of Subsea SeparatorsControl and Monitoring of Subsea Separators
Magne K. HusebøMay 2008
Content:
Introduction to the Subsea Profiler
Content:
Introduction to the Subsea Profiler
Conceptual Requirements for Subsea Instruments
Tracerco Subsea Profiler technology
TORDIS Subsea application
Subsea Profiler experience
Target: Transperant Subsea Separation
Graphics: FMC Technologies
1958 - 200850 Years
Core business: industrial radioisotope technology applicationsProvides a variety of process diagnostics methodsProvides a variety of process diagnostics methods World-leading top-side separation measurement supplier20 years experience in sub-sea applications
Background
Subsea comes calling:
g
2002 - Heightened interest in radioisotope technology for Subsea separation
2004 - FMC Kongsberg Subsea engaged Tracerco to develop2004 - FMC Kongsberg Subsea engaged Tracerco to develop a Subsea Density Profiler
Statoil Tordis SSBI requirements established:Statoil Tordis SSBI requirements established:Design, Build, Qualify and Test Subsea Profiler by end of 2006
Technology based on well-proven Tracerco Profiler™ concept (top-side)
Design basis - reliability:Prior use in 100+ topside applications (2000-04)Muliple detector systemRedundant signal handlingg g
Subsea Conceptual Requirements
20 year design life
Subsea Conceptual Requirements
20-year design lifeRadioisotope technologyNo moving partsP l t t bl d t t l tProven long term stable detector elementsProven low maintenance requirements
Non invasive & retrievableNon-invasive & retrievableDetector system isolated from the processComponents retrievable via running tool
Dynamic process mappingReal time – less than 1 sec update of all detectorsMonitoring of all process phasesMonitoring of all process phasesProcess diagnostics capabilities
Subsea Profiler – design challenges
Marinisation challengesD bl HP b i t d > thi k ll
g g
Double HP barriers; water and process -> thick wallsTopside Profiler materials not acceptable sub-seaIsotope used topside to ”weak” for high pressure barriers E t i bilit lti t tiEnsure retrievability – ultimate contingency
Qualification for Subsea use:Expensive prototypeExpensive prototypeFull qualification and testing of prototype required:
- temperature, shock & vibration acc. to ISO 13628-6 EMC testing- EMC testing
- Leak & Hyperbaric tests
Provision for Factory AcceptanceProvision for Factory AcceptanceExpensive Test Rig requirementFunction & ESS testing
Transperant Subsea Separation by Tracerco Subsea ProfilerGraphics: FMC Technologies
Transperant Subsea Separation by Tracerco Subsea Profiler
Principle of Operation – System Overviewp p y
Profiler source and detector array housings placed into vessel ”dip pipes”:µP
µP
Gamma transmission
• 2 Vertical detector Geiger arraysµ µ arrays
• 1 Source array
• Heavy alloy collimation
E h i di t 2• Each source irradiates 2 tubes detectors
Principle of Operation – System Overview
µP
µP
Topsides
Tracerco PLCSubsea
Control
Module
(Modbus)
Client Control System
• Raw signals conditioned and counted in field device• Information passed to dedicated PLC providing signal handling,
configuration alarms/daignostics and data transfer to DCSconfiguration, alarms/daignostics and data transfer to DCS• Count rates from each detector are plotted as a function of elevation
Principle of Operation – System Overview
Retriveable detector system
System acceptance testing
• Full scale process lab set up to mimic separator fluids• Calibration and functionality testing• Sand/Water/Emulsion/Oil simulation • Detector probe inter-changeability testDetector probe inter changeability test
– Demonstration of system operation during detector replacement– Demonstration of successful operation upon replacement
• Intervention tool performance test• Intervention tool performance test
Tracerco Subsea Profiler, graphic outputGas
F ( )Tracerco Subsea Profiler, graphic output Foam (none)
Oil
E l iEmulsion
Water
SandSand
Real-time process profile
Process profile trend
TORDIS Subsea Improved Oil Recovery SeparationTORDIS Subsea Improved Oil Recovery Separation
Tracerco contribution:
• 1 dual detector Profiler for main separator control
• 3 single detector Profiler for sand management
• 1 single detector system to be held as spare
• Profilers delivered to test site Dec 2006Profilers delivered to test site Dec 2006• Site Integration Test carried out with FMC 2007• Subsea deployment of separation system Sept 2007
TORDIS SSBI Subsea Profiler Specification
• Depth 1500m (pressure tested to 188Bar)• 1 source array / 2 detectors
M t i l 25C D l ( d T t d i t lli t )• Material: 25CrDuplex (and Tungsten radoisotope collimators)• Length: 2m measurement range• Process distance, isotope vs detector: 300mm• Resolution: 28mm (56mm pitch)• Density accuracy better than 10 kg/m3
• Temperature: -10 °C to 125°C
• Supply 24 volts, 200mA per detector• Subsea comms Modbus RTU – 2 wire RS485 - to client SCU• Topsides PLC Modbus RTU from Client• Topsides PLC to client control system – Modbus TCP/IP• Design Life 20 years
TORDIS IOR SSBI Systemy
Process Control aspects:Process Control aspects:
P fil idProfiler provides:
• Liquid level measurement• Water level measurement• Sand level measurement
Process Shut-down measurement:Process Shut down measurement:
P fil idProfiler provides:
• Liquid level shut-down measurement (SIL2 compliant)• Water level shut-down measurement (SIL2 compliant)
Process monitoring aspects:Process monitoring aspects:
P fil idProfiler provides:
• Foam height / trending• Liquid level height / trending• Emulsion band development and trending• Water level height and trendingg g• Sand level and trending• Density profile for input to production calculation
Process monitoring aspects:Process monitoring aspects:
Process Graphic interface:
Profiler technology benefitsProfiler technology benefits
(compared to traditional level measurement)
Application benefitsppReliable, repeatable, information rich measurementsMeasures all phases over full range of instrument – caters for operational changesNot adversely affected by pressure & density variations or foamingy y p y gDesigned for ”zero” operational maintenance, no moving parts, non-contactBuilt-in redunndancy features and diagnostics
2 detector arraysTube loss compensation
Retrievable via ROV without affecting Process
Profiler technology benefitsProfiler technology benefits
(compared to traditional level measurement)
Process benefits – ‘Insight’ into process conditions:Throughput optimisation through improved controlSand jetting optimisation; timing and duration.j g p ; gMonitoring effect of chemical additives: emulsion breaker / anti-foam *)Allows evaluation of changing operating regimes (well behaviour)Avoids accidental oil discharge in produced waterAvoids accidental oil discharge in produced water
*) if applicable subsea
Development project – learning / experience
Lengthy design process:– client requirements, tooling, access preferences
N d d t d dNew codes and standards:– fabrication learning curve, establish supply chain.
Seek standard piping components; cost / lead time4 man years spent on design, engineering & project admin for the marinisation process
Summary
Fruitful cooperation cooperation with FMC Technologies resulted in successful ‘marinisation’ of the Tracerco ProfilerTM
Th S b T P fil i l d ll biliti f f lThe Subsea Tracerco Profiler includes all capabilities of successful topsides unit; all in a ISO13628 designSubsea Profilers Operating successfully at Tordis SSBINext project with FMC Technologies: Total Pazflor (West-Africa)
Insight OnsiteInsight Onsite
Thank You for Your attention!