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
1 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
2
World’s Growing Fleet of Cylindrical Floaters:
3 Field operator: Petrobras FPSO Piranema Spirit Contract type: Build own and operate (ex Sevan Piranema) FPSO operator: Teekay Petrojarl In operation since October 2007 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
4 Field operator: Centrica Contract type: Build own and operate FPSO Hummingbird Spirit FPSO operator: Teekay Petrojarl Yard: Yantai Raffles/Keppel Verolme (ex Sevan Hummingbird) Location: UK Central North Sea In production since September 2008 at Water depth: 120m Centrica Operated Chestnut field Hull size: Sevan300
UK CNS Oil processing: 20 000 bod Water injection: 20 000 bwd Liquid combined: 30 000 bld
Redeployment options currently evaluated
5 FPSO Sevan Voyageur at the Premier Oil Shelley field In operation from August 2009 – July 2010
Field operator: Premier Oil Contract type: Build own and operate FPSO operator: Sevan Marine Yard: Yantai Raffles/Keppel Verolme Location: UK Central North Sea Water depth: 95m Hull size: Sevan300
Oil processing: 20 000 bod Water injection: 20 000 bwd Liquid combined: 30 000 bld Power feed to two ESPs 2*800kW
Re-deployed to E.ON operated Huntington field (Premier Oil 40% partner)
6 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 FPSO operator: Teekay Petrojarl Conversion Yard: Nymo Location: UK Central North Sea 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)
7 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 Oil processing: 100 000 bod Water injection: 125 000 bwd Gas compression: 140 Mill Scfd Oil storage: 1 000 000 bbls Power feed from shore 60 MW
8 Hull construction
9 Sevan 1000 for Goliat - HHI November, 2013
10 Sevan 400 for Dana Petroleum Operated– Western Western Isles Development Isles Fields
Contract type: Technology license Location: UK Northern North Sea Water depth: 165m Yard: COSCO Qidong Yard Hull size: Sevan 400 Oil processing: 40 000 bod Gas processing: 40 mmscfd Oil storage: 400 000 bbls
11 Sevan 400 for Dana Petroleum Operated– Western Western Isles Development Isles Fields Construction at COSCO Qidong November 2013
12 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
13 Sevan 300 No:4 and 5 COSCO Nantong, Completion to accommodation units First unit contracted by Petrobras
14 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
15
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
16 Insignificant bending stresses due to global loads on the hull
• Eliminating typical wave induced fatigue loads
• Minimal hull deflections (sag/ hog) simplifying topside design
17 Favourable Motions compared to shipshaped FSU/ FPSO
18 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
19
Sevan Hummingbird – Full scale motion recording program
20 Design wave conditions for cylindrical FPSOs in operation/ under construction
21 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
22
23 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
24 Tuning of hull shape for motion optimisation
25 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
26
FPU/FPSO for SCR
27 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
28 28 SCR Termination
12 deg.
Umbilical termination/hang- off at el. 46m
SCR hang-off Umbilical entry in deck at el.18m guide tubes .
SCR
SCR Weigth coating TDZ
29 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
30
SEVAN FLNG
31 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 LNG production capacity with two trains Up to 2,4 mmTPA
Ballast Tanks
32 SEVAN FLNG Main Dimensions
Based on Sevan Cylindrcal Hull
Hull diameter: 106 m Main deck diameter: 120 m Process deck diameter: 130 m Process deck Main deck elevation: 37 m Process deck elevation: 58 m Utility deck Operating Draft: ~20 -22 m Main deck
Process deck area: ~13 000 m2 2 Utility deck area: ~5 000 m Double bottom Main deck area: ~4 300 m2
33 SEVAN FLNG Main Dimensions
34 Sevan FLNG - Process Deck Arrangement
35 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
36 36 LNG Offloading systems
Side-by-side Offloading Sea states Hs = 2.0 / 2.5 m
Tandem Offloading Sea states Hs = 3.5 / 4.5 m
Offset Side-by-side Offloading Sea states Hs = 2.5 / 3.5 m
37 LNG Offloading systems Offset Side-By-Side offloading to conventional LNG carriers based on loading arms
38 LNG Offloading systems Conventional LNG carrier moored to a DP based HiLoad unit
39 «We make the (floater) world go round»
40