record-setting auv pipeline inspection in deepwater west...
TRANSCRIPT
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MCE Deepwater Development 2016
PAU, FRANCE • 5-7 APRIL 2016
Record-setting AUV pipeline inspection
in deepwater west Africa
Sébastien GHIS
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MCE Deepwater Development 2016
Objectives
• measure the water depth variations and slope changes along all in-field pipelines,
• create photo imagery mosaics along all in-field pipelines, FLETs and ILTs,
• create accurate 3D modelling of pipelines and adjacent seabed for free span assessment,
• establish a baseline for future surveys aiming to assess pipe displacement (lateral or upheaval buckling, etc.),
• identify areas of interest for further ROV detailed inspections,
→Survey company
Pipeline baseline survey Plan view
Longitudinal profile
Cross profiles
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MCE Deepwater Development 2016
ROV: Key information
Remotely Operated Vehicle (ROV)
• Remotely operated from the surface by pilots,
• Physically linked to surface vessel via main lift umbilical and tether, providing power supply and data transmission,
• 22 hours of operability per day,
• Average speed: 0.5 kts for a Work class ROV,
• Limited number of survey sensors carried on a WROV without dedicated survey skid,
• Intervention possible (debris removal),
• Navigation in the subsea facilities immediate vicinity is safe,
• Cathodic protection measurements possible.
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MCE Deepwater Development 2016
AUV: Key information
Autonomous Underwater Vehicle (AUV)
• No physical link to the surface,
• Operates pre-programmed missions close to seabed,
• Acoustically linked to the vessel,
• Dive duration (from 20 to 48 hours),
• Important number of survey sensors carried,
• Acquisition speed of 3.5 to 4.5 knots,
• Smoothed linear trajectory,
• No physical contact with subsea facilities required,
• Power supplied by batteries,
• Data downloaded via fiber optic cable once AUV on deck,
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MCE Deepwater Development 2016
Existing facilities:
• Surface facilities; FPSOs and OLTs,
• Subsea facilities; SSU, Manifolds, Spools, X-Trees,
Well Jumpers, riser towers, dynamic pipelines,
→ Adapted procedures and data base up to date
Other operations ongoing:
• Offloading : 1-2 Tanker per week on each FPSO (including tandem operations),
• MODUs (Mobile Offshore Drilling Unit),
• FSVs (Fields Support Vessels) installing X-Trees and Well Jumpers,
• installation vessels working an OLT, laying some umbilical and doing heavy lift,
• seismic vessel shooting a 4D seismic.
→Dedicated planner
Operations at sea – actual constrains
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MCE Deepwater Development 2016
• Surface and subsurface geophysical data for development engineering
• High resolution seabed mapping – Multibeam Echo sounder (300 kHz)
• Seabed features detection – Side Scan Sonar (120 kHz)
• Shallow subseabed characterisation – Sub Bottom Profiler (1.5-4.5 kHz)
• Acquisition characteristics
• Integrated positioning system
• Acoustic data link
• Acoustic command link
• Limitations
• Power supply (battery)
• Launch & recovery system
Conventional survey key acquisition parameters
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MCE Deepwater Development 2016
Data quality examples – Bathymetry and backscatter
• Manifold
Bathymetry (MBES)
Bathymetry (MBES) & Backscatter (SSS)
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MCE Deepwater Development 2016
• High resolution sensors for pipeline inspection:
• Laser Micro-Bathymetry system
(range resolution of 5 mm & 5 mm footprint).
The system collect 1400 samples per scan (a repetition rate of 29 Hz)
• Camera
High Resolution Digital Camera (Image resolution 4.4 mm).
Seabed coverage at 8 meter altitude: 6.0m x 4.5m (capture rate : 1.75s).
• Acquisition characteristics
• Power supply (battery)
• Download of data
Conventional survey key acquisition parameters
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MCE Deepwater Development 2016
Data quality examples – micro bathymetry
• Subsea laser - micro bathymetry
Spool
FLET
Trench
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MCE Deepwater Development 2016
Data quality examples – Photography
• Digital stills and photomosaic
• combines the benefits of visual imagery and photomosaic, to produce a large-scale overview of the field.
• Camera specifications:
• Survey speed @ 4 knots
• 1360x1024 pixels
• 6x4.5m coverage @ 8m
• 5 mm resolution
• Still picture every 1.7sec with 30% overlap
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MCE Deepwater Development 2016
Data quality examples – Combined laser and photos
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MCE Deepwater Development 2016
GIS tool for data review
• Objective
• Integrate all data recorded by AUV in single Geographical Information System (GIS ),
• Identify areas of interest for further detailed ROV survey,
• Facilitate analysis by pipeline specialists and inspection teams,
• Having an integrated support tool for subsea integrity– time lapse monitoring.
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MCE Deepwater Development 2016
Results examples – GIS products
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MCE Deepwater Development 2016
AUV Deep water subsea layout baseline survey
• Sensors are fully qualified and inspection AUV is fully operational,
• Provides subsea layout integrity review with optimal spatial resolution,
• Provides solid GIS products for subsea IRM planning and further dedicated ROV visual investigation,
• Provides a database which could be used for a “time lapse” approach in order to detect any seabed geohazard and subsea equipment modification during “life of field”,
• AUV pipeline inspection surveys may not fully replace ROV inspection surveys,
AUV deep-water subsea integrity surveys shall be promoted for existing “brown field” or forthcoming layout
Conclusions
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MCE Deepwater Development 2016
Thank you for your attention!
Questions and comments are welcome!
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MCE Deepwater Development 2016