2 marine operations intro
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2 Marine Operations IntroTRANSCRIPT
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FGN - Date: 2002-10-29 - Page: 1
DEVELOPMENT
RE
WATER DEPTH = 850 m
TOP OF SLIDE EDGE
WATER DEPTH = 250 m
10 KM
N
TO SHORE
DEVELOPMENT
RE
WATER DEPTH = 850-900 m
TOP OF SLIDE EDGE
WATER DEPTH = 250 m
N
EXPORT LINES:
INFIELD FLOWLINES:
•2 x 30”
•2 x 6” MEG
•3” Service
•Control Umb.
•2 x 12”
•2 x 4,5” MEG
•SU (2”)
Example: Ormen Lange
Approx. 21 KM TO TOP OF SLIDE EDGE
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FGN - Date: 2002-10-29 - Page: 2
AUV mapping of the sea bottom
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Environmental conditions
Water Depth
1000m
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Environmental conditions
0 5 10 15 20 25 30
0
2
4
6
8
10
12
14
16
18
20
22
Wav e pe ak perio d, Tp(s)
S i g n i f i c a n t w a v e h e i g h t , H m o ( m )
Approx im ate 100y r co ntourline s
Faroe area
Haltenbanken
Norte rn North S e a
GOM
WOA
-2000
-1750
-1500
-1250
-1000
-750
-500
-250
0
W a t e r D e
p t h ( m )
Hoover/Diana
Ursa
RamPowel
Girassol
Dalia
Roncador
Marlin Sul
Marlin 4
NorneTroll
Njord
Foinhaven
Schiehallion
Ormen
Lange
5
WA
8
Brazil
12
GoM
18
NNS/AM
Hs(m)
Crazy Horse
I n c r e a s i n g
c h a l l e n g e s
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Numerical simulation of current
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Pipelaying, Semisubmersible LB200
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S-laying and J-laying
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Free spanning pipeline
10000 15000 20000 25000 300000 5000
-900
-800
-700
-600
-500
-400
-300
-200
30” pipeline
Storegga s lide area, route South Eas t
W a t e r D e p t h ( m )
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FGN - Date: 2002-10-29 - Page: 9
Free span distribution
Ro u te S E (20 00 ) - ROV Pro file
Em p ty P ip e , T= 1 0 0 0 k N, 3 1 k m
S p a n Le n g th [m ]
S p a
n H e i g h t [ m ]
S-Lay
0 .5
5 .5
10 .5
15 .5
20 .5
4 0 1 4 0 2 4 0 3 4 0 4 4 0
Dn VG1 4
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FGN - Date: 2002-10-29 - Page: 10
TECHNOLOGY GAPS - PIPELINES
J-lay in deep water;
reduced radius, dynamics,Installation software
Pre/Post-lay dredging equipment
Trenching equipment in hard soil
Trawling - Long spans
Hydrate Prevention/Remediation
Long free span design
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Why is free spans a problem?
Vortex induced vibrations (VIV)
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FGN - Date: 2002-10-29 - Page: 12
From Troll to Ormen Lange -
A step into the deep.