Valen Chon
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Transcript of Valen Chon
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Forage et Production en Grande
Profondeur
(> 1 500 m)
Technologie et Scurit
Ttes de Puits en Surface
Claude Valenchon Saipem s.a.
ATELIER 4
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2Agenda Introduction
Saipem Subsea vs. dry-tree development
Existing dry-tree units : Tension leg platform (TLP) SPAR Geographical distribution
New concepts proposed by the industry Deep-draft semi-submersible Barge type
Drilling: Surface BOP vs. subsea BOP Dry-tree unit selection criteria
Functions and environmental conditions Incentives and favourable factors
Conclusion
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3IntroductionIntroductionIntroduction
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4OnshoreOnshoreOnshore
OffshoreOffshoreOffshore
Offshore Offshore DrillingDrilling OnshoreOnshore DrillingDrilling
Introduction : Saipem - Three Global Business Units
DrillingDrillingDrilling
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5AkpoAkpo URF (Nigeria)URF (Nigeria)
1350m WD1350m WD
Production and Injection Network-Umbilical Network-Gas Export pipeline-Oil Loading Terminal (OLT)-FPSO Mooring System
Sequoia (Egypt)Sequoia (Egypt)
Field Development and Floating Production
SURF EPCI
Manifolds, PLETs, flowlines, jumpers
53 km. of umbilicals
Normand CutterNormand Cutter
UsanUsan (Nigeria)(Nigeria)
Client: TotalClient: Total
URF and Loading Terminal EPCI URF and Loading Terminal EPCI
Local Content:
1.2 million man-hours
Introduction : Saipem - Large / Deepwater Projects
ErhaErha -- FPSO EPC (Nigeria)FPSO EPC (Nigeria)
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6Introduction : Saipem Offshore Technology Development Topics
Dry-tree barge
Offshore renewables
Subsea process
Floating LNG
SURF Technologies
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7Introduction : Typical Deepwater Subsea Development (AkpoAkpo Total Total Nigeria)Nigeria)
Risers
FPSO
Subsea wells
Drill ship
Flowlines
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Introduction : Typical Deepwater Dry-Tree Development (Kizomba - Exxon - Angola)
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9ExistingExistingExisting DryDryDry---TreeTreeTree UnitsUnitsUnits
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Tension leg platforms (TLP): First TLP: 1984 HUTTON (Conoco), North Sea
147 m wd Deepest TLP: 2005 MAGNOLIA (Conoco-Phillips), GoM
1425 m wd Maximum design depth: 2500 m wd (est.)
Existing Deepwater Dry-Tree Units (1)
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Spar: First Spar: 1997 NEPTUNE (Anadarko), GoM
590 m wd Deepest Spar: 2010 PERDIDO (Shell), GoM
2380 m wd Maximum design depth: 3000 m wd (est.)
Existing Deepwater Dry-Tree Units (2)
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North Sea
3 TLPs
Gulf of Mexico
17 Spars16 TLPs West Africa
4 TLPs
Southeast Asia
1 Spar1 TLP
Deepwater Dry-Tree Units Geographical Distribution
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New Concepts New Concepts New Concepts proposedproposedproposed by the by the by the IndustryIndustryIndustry
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Proposed by: Aker Solutions: DDP Floatec: Truss semiTM, E-semiTM Horton Wison: Multi-column Floater Moss Maritime: Octabuoy Technip: EDP
Main characteristics: From Mild to Harsh environment Wide range of water depth (150 m 3000 m) Can accommodate drilling, production and limited crude storage Up to 30 wells
Dry-Tree Deep Draft Semi-Submersible
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Example of Deep-Draft Semi-Submersible: EDP Extendable Draft Platform (Technip)Main characteristics: The EDP has:
Superior motions to a conventional semi-submersible Equivalent motions to a Spar Simple taut moorings
Production & drilling Wide payload range from wellhead
platform up to 50,000 tonnes and above Full drilling surface BOP Tender assisted drilling (TAD)
Construction & Transport Configuration
Operational ConfigurationCourtesy
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Example of Deep-Draft Semi-Submersible: Octabuoy (Moss Maritime-Saipem)
Currently under construction for ATP 2 successive planned applications for this unit namely the
Cheviot field (150 m water depth) in the North Sea and a GoM deepwater field (1500 m water depth)
10 dry trees
Courtesy
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Specific environmental conditions (Gulf of Guinea):Mild extreme environment: - Directional environment (swell, wind),
- Occasional long period swell with small amplitudes
Barge Type: the WellHead Barge (Saipem)
95% of wavesHs < 4.5 mTp < 16 s
Wind
Hs < 2.5 mTp < 11 s
West of Africa Gulf of Guinea
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Large Water depth range from 500m to 3000 m WD
From 6 to 30+ free standing top-tensioned dry-tree risers
From test and manifold only to full process capability
Large topsides loads capacity: oil production from 50,000 bopd to 250,000 bopd
Flexibility in rig selection Segregation of functions: utilities,
drilling, dry-tree, process highsafety level
WellHead Barge: Key Features
Drilling rig
Living quarter
Hull & moorings
High pressure
risers
Process Modules
Utilities modules
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Typical WellHead Barge for 20 wells, 100,000 bopd: General Overview and Dimensions
ProcessDrilling& Risers
UtilitiesLiving Quarter
Hull
Topsides
Hull dimensions:
Length: 260 m
Width: 60 m
Height: 20 m
Moonpool: 70 x 20 m
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DrillingDrillingDrilling: Surface BOP vs. Subsea BOP: Surface BOP vs. Subsea BOP: Surface BOP vs. Subsea BOP
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Drilling: Surface BOP vs. Subsea BOP
Surface BOP Used on fixed platform, TLP, SPAR Smaller, lighter and simpler BOP Permanent visual inspection Easier and simpler BOP test procedures Suitable for dual barrier drilling riser Short kill lines
Subsea BOP : Used with drillship or drilling semi-submersible Heavy and complex system at seabed BOP tests more complex and difficult Long kill lines (more difficult well control)
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DryDryDry---TreeTreeTree Unit Unit Unit SelectionSelectionSelection CriteriaCriteriaCriteria
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Completion only (drilling by MODU) Drilling and completion (included, or with tender) Work-over Accommodation and utilities Process from Manifold and test only to all process functions Oil storage (limited on deep-draft semi-submersible, possible on barge type)
Environmental conditionsEnvironmental conditions From mild to harsh: TLP, Spars, deep-draft semi-submersible Mild (Gulf of Guinea): Barge type
Dry-Tree Unit Selection Criteria
Possible Possible FunctionsFunctions of Dryof Dry--TreeTree UnitsUnits
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Incentives: Rapid and easy access to well for control, monitoring and interventions Easier use of ESPs in wells (thanks to easy access); Better reservoir management
(no commingling of well fluids, monitoring per well,...); Improvement of flow assurance; Higher recovery factor Independence from drilling rig availability.
Favourable factors for the selection of a dry-tree unit: Compact reservoirs; Deeply buried reservoirs; Wells requiring frequent interventions
(monitoring, ESPs, water flooding, side-track); Scarcity / high cost of drilling vessels.
Deepwater Dry-Tree Units Selection Criteria (vs. Subsea wells)
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ConclusionConclusionConclusion
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Conclusion
DryDry--tree units have an excellent track recordtree units have an excellent track record Wide range of possible functions from completion / wellhead only,
to drilling wellhead and full production Wide range of environmental conditions and water depth Reduced subsea IMR operations during field life
(less equipment on sea-bed)
DryDry--tree units might be a good way to develop deeper and tree units might be a good way to develop deeper and more difficult reservoirs?more difficult reservoirs?