Download - Benefits of Cylindrical FPOs

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Benefits of a cylindrically shaped floater for an FPSO application in cyclone exposed environments

Presentation by: Fredrik Major, CBDO, Sevan Marine ASA

for INTSOK DEEP WATER CONFERENCE

Thursday 14 November 2013, Parmelia Hilton Hotel I Perth, Australia

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Contents

• Introduction and projects

• Features of the cylindrical hull

• Operational experience

• Permanent mooring in Cyclonic Conditions

• FPSO with SCRs in harsh deep environments

• FLNG application

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World’s Growing Fleet of Cylindrical Floaters:

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FPSO Piranema Spirit (ex Sevan Piranema)

In operation since October 2007

Field operator: Petrobras

Contract type: Build own and operate

FPSO operator: Teekay Petrojarl

Yard: Yantai Raffles/Keppel Verolme

Location: Offshore Aracaju, Brasil

Water depth: 1000m

Oil processing: 30 000 bod

Gas processing/injection: 3.6 mill Sm3/day-130 mill scfd @

280 bar

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FPSO Hummingbird Spirit (ex Sevan Hummingbird)

In production since September 2008 at

Centrica Operated Chestnut field

UK CNS

Field operator: Centrica




Location: UK Central North Sea

Water depth: 120m

Hull size: Sevan300


Water injection: 20 000 bwd

Liquid combined: 30 000 bld

Redeployment options currently evaluated

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FPSO Sevan Voyageur at the Premier Oil Shelley field In operation from August 2009 – July 2010

Field operator: Premier Oil


FPSO operator: Sevan Marine



Water depth: 95m

Hull size: Sevan300



Liquid combined: 30 000 bld

Power feed to two ESPs 2*800kW

Re-deployed to E.ON operated Huntington field

(Premier Oil 40% partner)

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FPSO Voyageur Spirit – First redeployment (ex Sevan Voyageur producing the Premier Oil operated Shelley field)

In operation at the EoN operated Huntington field since March 2013

Field operator: EoN Ruhrgas

Contract type: Lease and operate


Conversion Yard: Nymo


Water depth: 89m

Hull size: Sevan300

Oil processing: 30 000 bod (20’)

Water injection: 48 000 bwd (20’)

Liquid combined: 60 000 bld (30’)

Gas Compression 38 mmscfd (none)

http://intranet.sevan.local/FPSO Sevan Voyageur/120930 Sailaway/120930_Voyageur_Spirit_Sailaway_9_high.JPG

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FPSO Sevan 1000 for the ENI operated Goliat field Contract type: Technology license

Location: Norwegian Barents Sea

Water depth: 400m (Harsh and sub-arctic)

Yard: Hyundai Heavy Industries

Hull size: Sevan1000



Gas compression: 140 Mill Scfd

Oil storage: 1 000 000 bbls

Power feed from shore 60 MW

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Hull construction

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Sevan 1000 for Goliat - HHI November, 2013

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Sevan 400 for Dana Petroleum – Western Isles Development Sevan 400 for Dana Petroleum Operated Western Isles Fields

Contract type: Technology license

Location: UK Northern North Sea

Water depth: 165m

Yard: COSCO Qidong Yard

Hull size: Sevan 400


Gas processing: 40 mmscfd

Oil storage: 400 000 bbls

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Sevan 400 for Dana Petroleum – Western Isles Development Sevan 400 for Dana Petroleum Operated Western Isles Fields Construction at COSCO Qidong November 2013

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Sevan Drillers (owner/ operator Sevan Drilling)

DP based MODU for Ultra deep water drilling

Carrying capacity of the drillship, motion as a semisubmersible

Yard: COSCO, China

Sevan Driller - Contracted by Petrobras

Sevan Brasil - Contracted by Petrobras

Sevan Louisianna – Contracted by LLOG Bluewater

Sevan Driller No:4

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Sevan 300 No:4 and 5 COSCO Nantong, Completion to accommodation units

First unit contracted by Petrobras

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Contents







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Geo-stationary hull – Main benefits

• Hull facing environment with same shape in all directions – no need to rotate,

even in the harshest environmental conditions

• Axio-symetric hull – no weathervaning -> Eliminating turret and swivel

• Tolerant for weather spreading (waves/ wind/ current from different directions)

• Capex savings: Cost of turret /swivel as well as thrusters avoided

• Opex savings: Reducing requirement for marine crew and fuel consumption

• Increased flexibility:Spare capacity for tie ins simply by spare riser guide tubes

• Power transfer: Facilitates high electric power transfer

WAVESs

Sevan

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Insignificant bending stresses due to global loads on the hull

• Eliminating typical wave induced fatigue loads

• Minimal hull deflections (sag/ hog) simplifying topside design

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Favourable Motions compared to shipshaped FSU/ FPSO

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Contents







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Sevan Hummingbird – Full scale motion recording program

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Design wave conditions for cylindrical FPSOs in operation/

under construction

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Contents







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Permanent mooring in Cyclone exposed areas JIP including model tests with Sevan Platforms

Demonstrated feasibility of safe permanent

mooring through cyclone condition

Significant increase in production uptime

based on avoiding disconnection

Mooring in fixed orientation eliminates

problem with rapid change of wind

direction forcing a shipshaped FPSO to

get waves beam on and excessive roll

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Tuning of hull shape for motion optimisation

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Contents







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FPU/FPSO for SCR

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ENABLING SCRs FOR HARSH ENVIRONMENT FPSOs Sevan Hull Tuned for Optimized Motion Pattern

Steel Catenary Risers (SCRs) features:

- Lower cost

- Higher and more predictable durability

- Higher capacity for top tension,

temperature and pressure

- More flexibility for corrosion protection

and thermal insulation

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SCR Termination

SCR

TDZ

12 deg.

SCR Weigth coating

SCR hang-off

deck at el.18m Umbilical entry in

guide tubes .

Umbilical

termination/hang-

off at el. 46m

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Contents







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SEVAN FLNG

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Sevan FLNG Concept

Tank Arrangement and Capacity

LNG storage (6 tanks): 180 000 m3

LNG/ LPG storage (1 tank): 30 000 m3

Condensate storage (6 tanks): 28 000 m3

Ballast tanks (24 tanks): 80 000 m3

LPG/LNG Tank

LNG Tanks

Condensate Tanks

Ballast Tanks

LNG production capacity with two trains

Up to 2,4 mmTPA

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SEVAN FLNG Main Dimensions

Based on Sevan Cylindrcal Hull

Hull diameter: 106 m

Main deck diameter: 120 m

Process deck diameter: 130 m

Main deck elevation: 37 m

Process deck elevation: 58 m

Operating Draft: ~20 -22 m

Process deck area: ~13 000 m2

Utility deck area: ~5 000 m2

Main deck area: ~4 300 m2

Process deck

Utility deck

Main deck

Double bottom

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SEVAN FLNG Main Dimensions

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Sevan FLNG - Process Deck Arrangement

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Cooling seawater Intake

• Large cooling water requirement – typical for 2.4 MTPA 18 000 m3/h

• Seawater intake from cold deepwater

• Stationary unit-> no interference with mooring and risers

-> no swivel for cooling water required

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LNG Offloading systems

Side-by-side Offloading

Sea states Hs = 2.0 / 2.5 m

Tandem Offloading


Offset Side-by-side Offloading


http://intranet/../Projects/FLNG/Presentation/Shortcut to test_a.wmv.lnk

http://intranet/../Teknisk/Model test Offloading/2100_pip.wmv

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LNG Offloading systems Offset Side-By-Side offloading to conventional LNG carriers based on loading arms

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LNG Offloading systems Conventional LNG carrier moored to a DP based HiLoad unit

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«We make the (floater) world go round»

Download - Benefits of Cylindrical FPOs

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