Disconnectable FPSO for Deepwater Fields in the Gulf of Mexico
Yong LuoSBM Atlantia
April. 25 2007
INTRODUCTIONCONCEPT OVERVIEW
VESSEL/TOPSIDES
TURRET
MOORINGS
RISERS
SUMMARY
DISCONNECTABLE FPSODISCONNECTABLE FPSO
Confidential
FPSO UPDATESFPSO UPDATES
Over 100 FPSOs in every other regions of the world from West of Africa to Northern Atlantic Margin;
Water depths from 20 meters (Chang Qing Hao) in South China Sea to 1,853 meters (Seillean) Offshore Brazil;
Vessel sizes from a mire 50,000 bbl to 2,000,000 bbl storage;
Production rates from 11,000 bbl/d to 200,000 bbl/d;
Maximum number of risers up to 45, now 75 for P53;
FPSO has been proven to be a versatile system for all regions and conditions.
FPSO has storage capacity and can operate independently in areaswithout pipeline networks.
FPSO has cost advantage over other floating production platforms.
FPSO utilizes the VLCC tanker hull form that can be newly constructed in one of the many experienced shipyards or converted from a large pool of supply of tanker fleet.
FPSO provides ample deck space for topsides processing equipmentand crude storage capacity that makes it independent of pipelines.
FPSO is highly mobile and can be re-deployed to another field without extensive modifications.
FPSO FPSO FEATURES AND ATTRACTIONS FEATURES AND ATTRACTIONS
Geographic Distribution of FSO/FPSO Projects
Geographic Distribution of FSO/FPSO Projects
SBM involvement in 52 FSO/FPSO projects Worldwide FPSO fleet today: 121 units
50 units owner by Contractors
28
1
11
7
12
22
AfricaEurope/RussiaAsia/Far EastMiddle EastAmericasAustralia
Environmental and Regulatory Requirements First FPSO project in Gulf of Mexico New combination of existing, proven technology
Large Pipeline Infrastructure Tie-in to pipeline network Storage onboard and offload to shuttle tanker
Deepwater Fields Vessel Station Keeping Flexible Riser and SCR Limits
High Pressure and Temperature Reservoirs Disconnection Equipment Flexible Riser Limits
SPECIAL DESIGN ISSUES FOR GOM FPSOSPECIAL DESIGN ISSUES FOR GOM FPSO
PERMANENT VS DISCONNECTABLEPERMANENT VS DISCONNECTABLE
Simpler turret mooring system Smaller mooring size Permanent riser connection
Autonomous evacuation from site No abandonment of unit/oil storage Riser motions reduced during hurricane Safe: possibility to avoid hurricane
PROS
CONS
Permanent MooringDisconnectable Mooring
Must survive hurricane Heavy mooring system Offshore modifications Insurance for total loss
Disconnect system required
INTRODUCTION
CONCEPT OVERVIEWVESSEL/TOPSIDES
TURRET
MOORINGS
RISERS
SUMMARY
Disconnectable / re-deployable system targeting: Marginal Field Development Early Production System (EPS) Full Field Development
Disconnectable Turret Mooring System
Existing double hull tanker
Offloading to shuttle tanker or oil pipeline
Capable of receiving oil (hub function)
Gas export by pipeline
GoM FPSO Concept OverviewGoM FPSO Concept Overview
Field Development Design Basis:
Design Life: 15 years
Design water depth: 5,000 - 10,000 ft
Produced gas (associated) consumed; excess exported via (small) diameter pipeline to nearest deepwater gas pipeline
Oil export by shuttle tanker, with option for pipeline export
Concept Overview Concept Overview Design ValuesDesign Values
Connection/Disconnection Design BasisConnection/Disconnection Design Basis
0.8 m/s26 m/s12.5 s8.1 mEquivalent to 100 yr Winter Storm
2.5 m/s56.7 m/s16.5 s18.3mEquivalent to 1000 yr Hurricane
Survival Design Criteria for Buoy Disconnected from Vessel
2.4 m/s11.8 m/s8.2 s2.8 mOr, Equivalent to 100 yr Loop Current Event
2.3 m/s46.1 m/s14.9 s14.6mEquivalent to 100 yr Hurricane
Maximum Design Criteria for Buoy Disconnected from Vessel
2.5 mTurret Equipment Design Criteria
Maximum Design Criteria During Reconnection
2.4 m/s11.8 m/s8.2 s2.8 mOr, Equivalent to 100 yr Loop Current Event
Maximum Design Criteria for Disconnection
0.8 m/s26 m/s12.5 s8.1 mEquivalent to 100 yr Winter Storm
Maximum Design Criteria for FPSO Connected Condition
Current(m/sec)
Wind(m/sec)
Period(sec)
Wave Hs
(m)
INTRODUCTION
CONCEPT OVERVIEW
VESSEL/TOPSIDESTURRET
MOORINGS
RISERS
SUMMARY
HULL/TOPSIDES COMPONENTSHULL/TOPSIDES COMPONENTS
Oil Separation LPOil Separation HP
Gas Process
Flare Stack
Gas Compression
Gas Treatment
Water InjectionWater TreatmentPower Generation
Equip, storage, util.
Typical Modular Concept
Required storage capacity
Required deck space
Shuttling philosophy
Stability
Global strength
Fatigue and design life
Freeboard in fully loaded condition (green water prevention or protection)
Minimum draft in ballast condition (wave slamming)
VESSEL DESIGN CONSIDERATIONS
INTRODUCTION
CONCEPT OVERVIEW
VESSEL/TOPSIDES
TURRETMOORINGS
RISERS
SUMMARY
Field-proven mooring technology: China/Australia (typhoon/cyclone area) Newfoundland (ice conditions)
Possibility to avoid hurricane design conditions Free weathervaning system Controlled-disconnection system min. downtime All reconnection equipment onboard
Turret Moored Option
Disconnectable Turret Mooring Systems
System 1 System 2:Buoy Turret Mooring (BTM) Riser Turret Mooring (RTM)
Disconnectable Turret Moored FPSODisconnectable Turret Moored FPSO
BTM System: Internal turret system Disconnected buoy: approx. 50m below
MSL Riser buoy disconnection:
Planned disconnection (typically: 6 hr.) Emergency disconnect (typically: 15 min.)
Location ESD/connectorsHuizhou, 1988 Xijiang, 1992
Disconnectable Turret Moored FPSO
White Rose BTM System: Offshore Newfoundland Design environmental conditions:
Wave (Hs) 15.5 m (Tp: 12-16 sec) Wind (1-hr) 35.2 m/sec Current 1.32 m/sec
12 risers / 121 m WD Possibility for rapid disconnection
Disconnectable Turret Moored FPSO
RTM System: External turret system
Disconnectable Turret Moored FPSO
Enfield RTM System: Offshore NW Australia Design environmental conditions:
Wave (Hs) 15.5 m (Tp: 12-16 sec) Wind (1-hr) 35.2 m/sec Current 1.32 m/sec
Total of 11 risers Scheduled for installation in 2006
Disconnectable Turret Moored FPSO
SBM Disconnectable Turret ExperienceSBM Disconnectable Turret Experience
External turrets (RTM Riser Tower Mooring) Jabiru Venture FPSO W. Australia 1985 RTM Skua Venture FPSO W. Australia 1991 RTM Griffin Venture FPSO W. Australia 1993 RTM Cossack Pioneer FPSO W. Australia 1993 RTM Enfield FPSO W. Australia 2005 RTMInternal turrets (BTM Buoy Turret Mooring) NHFX FPSO ACT China 1988 BTM NHKT FPSO Phillips China 1992 BTM White Rose FPSO Canada 2003 BTM
Disconnectable turret system: Fluid connectors/disconnectors
Max. rating: 6,500 10,000 psi. Located in ventilated area or at main deck level
Structural connector Max. loads/moments
OptionsOptions
TURRET
QC/DC
QC/DC Valves
ESD ValveRiser Termination
Jacks
MAINMAINCONNECTORCONNECTOR
RiserStopper
ChamberSeals
ExpansionJoint(SeawaterBarrier)
BTM CONFIGURATIONBTM CONFIGURATION
INTERNAL TURRET GENERAL ARRANGEMENTINTERNAL TURRET GENERAL ARRANGEMENT
Riser with isolation valves in connected condition on vessel deck
Riser handling winch
Chain Jack
Structural Connector
Riser with isolation valves in disconnected condition on the buoy
INTRODUCTION
CONCEPT OVERVIEW
VESSEL/TOPSIDES
TURRET
MOORINGS RISERS
SUMMARY
Mooring system designed according to API RP 2SK/2SM
Mooring system is capable of withstanding 100 year return winter storm and 100 year return hurricane, i.e. no disconnection except hurricane conditions
3 x 3 mooring spread
Chain/polyester/chain combination or Chain/wire/chain
Polyester does not touch seabed during any operating conditions
MOORING DESIGNMOORING DESIGN
MOORING DESIGNMOORING DESIGN
MOORING DESIGNMOORING DESIGN
INTRODUCTION
CONCEPT OVERVIEW
VESSEL/TOPSIDES
TURRET
MOORINGS
RISERSSUMMARY
Flexible risers -Maximum riser size for 8,000 ft water depth @10,000 psi being investigated
Hybrid risers -Design of steel catenary riser system with flexible risers at top to accommodate buoy disconnection
Riser tower(s) -Single riser tower with multiple risers or Individual riser tower for each riser
Hybrid tower riser Midwater buoy tethered to seabed
Riser Design OptionsRiser Design Options
Flexible or SCR SolutionFlexible or SCR SolutionBuoy Disconnected in 1000 yr HurricaneBuoy Disconnected in 1000 yr Hurricane
Riser SLOR SolutionRiser SLOR Solution
Riser Tower Description
Model TestingModel Testing
Objectives
To verify in-place mooring system design To check buoy stability in severe hurricane and loop current
condition when disconnected
To simulate disconnection process To predict re-connection load
Model Testing Model Testing Vessel ModelVessel Model
Model Testing Model Testing Buoy ModelBuoy Model
Model Testing Model Testing TruncationTruncation
Model Testing Model Testing InIn--place Conditionplace Condition
9 Model Tests Overview: The Key Tests (1/4)
Connected tests (100 year Winter Storm)
Model Testing Model Testing InIn--place Conditionplace Condition
9 Model Tests Overview: The Key Tests (1/4)
Connected tests (100 year Winter Storm)
Model Testing Model Testing Buoy DisconnectionBuoy Disconnection
Connected tests (100 year Winter Storm)
Model Testing Model Testing Buoy DisconnectedBuoy Disconnected
Model Testing Model Testing Buoy ReconnectionBuoy Reconnection
X
Z20 m
X
Z
OrcaFlex 9.0e: BMT_4RisersTower_AA_ReConn_BigRecessBuoy40m.dat (modified 1:05 PM on 12/15/2006 by OrcaFlex 9.0e) (azimuth=270; elevation=0)Statics Complete
Model Testing Model Testing Buoy ReconnectionBuoy Reconnection
SummarySummary
Disconnectable FPSO is an attractive field development option for GOM to avoid severe hurricane conditions.
Disconnectable internal turret moored FPSO is recommended to avoid emergency disconnect scenario and high OPEX of DP.
Turret disconnection system uses equipment and design, proven onprevious projects elsewhere in the world.
SummarySummary
Disconnectable FPSO can sail to yard at a later date to have future equipment installed.
The discoonectable mooring buoy is designed to connect with the turret during operation and submerges to sub-surface in the disconnected condition.
The buoy can be re-connected with the FPSO using the winch/chainjack onboard.
THANK YOU!