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!