part of Aker
Challenges and Solutions for Deepwater
and the Arctic - New Floater Frontiers
AGENDA
Deepwater
Technical Day 2010
Henrik Hannus / Magne Nygård
Status
Challenges
Solutions
Arctic
Challenges
Way to solutions
Summary
© 2008 Aker Solutions
Status: North Sea
Client: Statoil
- Condensate 14 kSm3/d
- Gas 17 Msm3/d
- 23,000 t topsides dry
- 380 m water depth
- Flexible risers
- Chain-wire mooring
Slide 2
© 2008 Aker Solutions
part of Aker
Status: Deepwater Brazil
Client: Petrobras
- 180 mbopd
- 32,000 t topsides
- 1,800 m water depth (P-52)
- Steel catenary risers
- Polyester mooring (16 lines)
Aker Solutions Scope:
- Hull & mooring Ext FEED
- Class Approval
- Three platforms (52, 51, 56); 2001 - ongoing
Slide 3
© 2008 Aker Solutions
part of Aker
Status: Deepwater Gulf of Mexico
Client: Chevron
- 2,000 m water depth
- 45mbopd, 45mmcfgpd
- Steel catenary risers
- Polyester mooring (8 lines)
Slide 4
Aker Solutions Scope:
- Hull & mooring EPC
- Riser design
- Installation
© 2008 Aker Solutions
part of Aker
Status: Deepwater Gulf of Mexico (risers)
Riser Porches
SCR
Titanium Stress
Joint (TSJ) with
hang off cone
Weight filler in coating
(7” prod. risers)
Strakes for VIV
suppression
Slide 5
© 2008 Aker Solutions
part of Aker
Deepwater Challenges – North Atlantic
■ Semisubmersible
● SCR performance (strength and fatigue)
● Mooring system, dynamics
● SCR installation (motions, diverless)
■ Spar
● As for semi
● Performance in long period waves
● Fatigue
■ TLP
● Installation (foundations, tethers)
Slide 6
© 2008 Aker Solutions
part of Aker
Deepwater Solutions
■ DeepStar, CTR 7404 (2004-2005):
Semi at 10,000 ft WD with Steel Catenary Risers,
Gulf of Mexico
● Feasibility study – positive conclusion
● Main Issue: SCR weight at installation
■ Demo 2000 (2004-2006):
“Semi and Steel Catenary Risers (SCR) in Deep
Water and Harsh Environment Conditions”
● Sponsors:
■ Shell, Statoil, Hydro, BP, DNV, Marintek
■ Model testing at Marintek
■ Haltenbanken conditions
■ 1500 m water depth
● SCR
■ 24” Gas export riser
■ 16x11” Production & Injection
■ Robust design (SN E-curve)
● Hull
■ Topsides 24 500 t
■ Draft 40m
Slide 7
© 2008 Aker Solutions
part of Aker
SEMI WITH SCRs, WHAT DOES IT TAKE?
■ “Standard” Semi motions excessive for SCRs
■ Offset must be limited (~10% of water depth)
■ In 2001 Aker Solutions undertook an extensive parameter study to find driving
factors in SCR performance. Some findings of the work:
● Design hull, mooring and risers (SCRs) as one integrated system
● Heave motions most important for SCR performance, but pitch also of
importance → Riser hang-off position
● Draft is the most important parameter for heave motions
● Asymmetric hull, inclined columns, ”funny” shapes etc have little effect, draft
drives heave
Slide 8
© 2008 Aker Solutions
part of Aker
Arctic Challenges
■ Vulnerable eco-system
● Development
● Accident consequences
■ Extreme temperatures
■ Ice conditions
■ Limited infrastructure
■ Long tie-back distances
■ Long distance to market
■ Limited Daylight (Winter season)
■ Limited weather window:
● Construction, Installation, Hook-up &
Completion
■ Personnel Health and Safety
■ Working environement
Slide 9
© 2008 Aker Solutions
part of Aker
Safety and Environment Challenges
Inspection and maintenance
(Snøhvit)
Emergency escape
Lifeboats
Slide 10
© 2008 Aker Solutions
part of Aker
Arctic Solutions, Aker H-6e
Remote operation
■ Large payload and storage
capacity (2 x conventional rigs)
Efficient
■ Double RamRig™
■ Large working space
Environmentally friendly
■ Zero harmful discharge to sea
Extreme conditions
■ (+35°C/-20°C)
■ Protected working and storage
areas
■ Fully winterized
Slide 11
© 2008 Aker Solutions
part of Aker
Arctic Solutions
White Rose
Client:
■ Husky
Water depth:
■ 105 m
Aker Solutions Scope:
■ Engineering Design and
Management
Sakhalin II
Client:
■ Sakhalin Energy Investment Co.
Water depth:
■ 48 m (LUN-A); 30 m (PA-B)
Aker Solutions Scope:
■ EPCI Concrete GBS (2)
Slide 12
© 2008 Aker Solutions
part of Aker
Challenge: Global Ice Loads
Designs to reduce ice
loads
• Double acting tankers
• Ice breaking features
Loads determined by
testing
Slide 13
© 2008 Aker Solutions
part of Aker
Case: Shtokman Spar Studies
Floating platform
■ Arctic environment
■ Sea ice and iceberg risk
“Spar” – type
■ Ice breaking water line
■ Disconnectable
● Risers
● Mooring
Slide 14
© 2008 Aker Solutions
part of Aker
Arctic Challenges - Ridges
Slide 15
© 2008 Aker Solutions
part of Aker
Arctic Solutions: Ridge Loads
35
Fx Fixed
Fz Fixed
Keel depth Fixed
Sail heigth Fixed
32
28
24
Load: [MN]
Ridge geometry: [m]
20
16
12
8
4
0
-4
-8
-12
-16
-20
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Distance [m]
Slide 16
© 2008 Aker Solutions
part of Aker
Video
Slide 17
© 2008 Aker Solutions
part of Aker
Arctic Solutions: Observations
● Minimum diameter
● Design for ice failure in mode that
gives minimum load
● Sloping sides in the waterline
■ Failing ice in bending
■ Failing ice downwards gives smaller loads
than failing ice upwards
● Design hull to dispose of broken
ice
■ Avoid rubble accumulation
■ Avoid inducing other failure modes of ice
Slide 18
© 2008 Aker Solutions
part of Aker
Conclusions
■ Deepwater Challenges for North Atlantic
● Merge competence from North Sea & International
Deepwater
● Technology Extension
■ Risers
■ Moorings
■ Arctic Challenges
● Build on (limited) references
● Area of Step Change
■ Environmental uncertainty
■ Design for sea ice
● Enhanced safety level
Slide 19
© 2008 Aker Solutions
part of Aker
Copyright
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remains vested in Aker Solutions and third party contributors as appropriate. Accordingly, neither the
whole nor any part of this document shall be reproduced in any form nor used in any manner without
express prior permission and applicable acknowledgements. No trademark, copyright or other notice
shall be altered or removed from any reproduction.
Slide 20
© 2008 Aker Solutions
part of Aker
Disclaimer
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are subject to risks and uncertainties that could cause actual results to differ. These statements and
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Slide 21
© 2008 Aker Solutions
part of Aker
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