2 marine operations intro

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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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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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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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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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From Troll to Ormen Lange -

A step into the deep.