Subsea 7 Fleet

Avanserte dykkeoperasjoner på Ekofisk

Rune Femsteinevik Project Manager

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Agenda

•Introduction

•Introduction Conoco Phillips projects

•Preparation work

•Assets

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Introduction

Subsea7, has over 35 years experience, of World Wide Hyperbaric Welding Operations.

Present day Subsea 7 have performed: • Over 700 Hyperbaric Welds on pipelines, • 35 platform repairs • 7 Hot Taps (Weld Induction Heating),

in varying water depths and locations around the World.

Subsea7 Hyperbaric Welding capabilities encompass: •Standard, Pipeline/Spool/Riser-Structure Tie Ins. •Emergency Pipeline Repair, as well as, design, supply and operate for Clients, an “on standby”, Emergency Pipeline Repair System , EPRS.

•Hot Tap, utilizing Induction Heating. •Structural Repairs.

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Conoco Phillips

• There are three projects under the ”Ekofisk area Norway Capital Projects” umbrella all involving Hyperbaric welding:

• Ekofisk VB

• Eldfisk

• B11

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Ekofisk Victor / Bravo

• Fabrication and installation of Inline-Tee (hyperbaric welding)

• Fabrication and installation of Inline-Tee protection structure

• Reeling, transportation, installation of CPI Umbilical with Rovcon tie-in

• Design, fabrication and installation of 12” WI rigid pipe with HDPE liner and Rovcon PLETs.

• Fabrication and installation of 8”/12” and 12” spools with Rovcon tie-in

• Fabrication and installation of GRP covers

• Installation of CPI template protection structure

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Subsea7 Scope of work - Eldfisk II - Eldfisk Area

• Depth 70m

• Installation and tie-in of 24" oil and 30" gas Wye structures downstream 2/7B platform (Hyperbaric welding on 30” Gas pipeline)

• Tie-in of 24“ and 30” pipelines going from 2/7S riser to Wye Structure downstream 2/7B platform.

• Subsea re-routing of Embla pipeline P2040 to 2/7S platform

• The tie-ins for the WYE’s

are scheduled for the field

shutdown during june 2013

• Fabrication of 28 off spools

(30”,24” and 14”).

Tie-in welds

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B11 By-Pass

Background

The Norpipe gas pipeline designated P2028N is a 36" natural gas pipeline which transports gas

from the Ekofisk Area , Draupner and Valhall Fields to Norsea Gas Terminal at Emden in Germany.

Norpipe and the Emden Plant have been in operation since 1977 exporting gas from Ekofisk and

other Norwegian fields to continental Europe. The pipeline and receiving terminal are operated by

Gassco

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B11 Bypass Project. June 2013

•Norway; (German Sector)

• Installation of a 36” Bypass

spool around the redundant B11

Booster Platform

•2 Simultaneous Hyperbaric

welding campaigns.

• Offshore During Shut-down in

June 2013

•24 Diver welders to be Qualified.

•Hyperbaric welding quals

starting @ NHC January 2013.

•Pipesize: 36”

•Water depth: -34msw

Prep Work 2012

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Concrete removal Eldfisk and Ekofisk VB – Remote

PCRT (Pipeline Concrete Removal Tool) from

PROSERV

•Succsesfully removal of a total 20 m concrete both at

Eldfisk and Ekofisk VB.

• Removal rates was approximately 7hrs/m

•Clean class SA-2

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Concrete removal B11– Divers

10 m of 55mm thick concrete was removed

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UT and Ovalisation Check – Remote

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UT and Ovalisation Check – Divers

1st scan south location

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Prep work - Dredging

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National Hyperbaric Centre (NHC) Work chamber set up

Prior to the welding in 2013 we will qualify36 Diver Welder’s at NHC Aberdeen

Assets

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Seven Atlantic

• Delivery: 2009

• Owner: Subsea 7

• L:142m, B: 26m

• Deck Area: 1200m2

• Crane: 120Te SWL

• Dive System: 24 man,

twin bell (port,

starboard)

• 2x 18 men HRV

• ROV: 2x Obs-ROV

• Options for WROW

• Operation area: North

Sea (UK & Norway)

The Seven Atlantic has been a great success and has been working since

23rd March 2010 and completed over 1,100 dives

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Seven Havila

• Delivery: 2011

• Owner: Subsea 7 &

Havila 50/50

• L:120m, B: 23m


• Crane: 250Te SWL


twin bell (port, starboard)

• 2x 24 men HRV

• ROV: 1x Obs-ROV

• Options for WROW

• Acc: 120 persons

• Operation area: North

Sea (UK/Norway/DK)

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4 divers in each bell

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Seven Pelican

• Built: 1985

• Owner: Subsea 7

• L:94m, B: 18m


• Crane SWL: Hydralift 120Te SWL (HC), 400m reach

• Dive System: 18 man, twin bell (port, starboard)

• 2x16 men HRV

• ROV: 1xObs- ROV

• Acc: 105 persons

• Operation area: North Sea (UK/ Norway/DK)

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Acergy Osprey

• Built: 1984

• Owner: Subsea 7

• L:102m, B: 20m


• Crane SWL: 150Te SWL

• Dive System: 18 man, twin bell system

• 1x18man HRV

• ROV: 1xObs-ROV

• ACC: 102 persons

• Operation area: North Sea (UK/Norway/DK)

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LDC Seven Spray

• Built: 2008

• Owner: Subsea 7

• L:12m, B: 3,5m

• Deck Area: 12m2

• Winch: 150kgSWL

• Dive System: Air/Nitrox diving to 50msw

• ACC: 8 persons

• Operation area: North Sea (UK-Norway-WW)

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Rockwater 2

• Built: 1983

• Owner: Subsea 7

• L:119m, B: 22m


• Crane SWL: 300Te SWL, 1000m reach

• Crane SWL: 100Te, 300m

• Dive System: 16 man, single bell

• 1x16 man HRV

• ROV: 1xWROV


• Operation area: Asia Pac./WW

Rockwater 1

• Built: 1982

• Owner: Subsea 7

• L:98m, B: 18m


• Crane SWL: Hydralift

120Te SWL, knuckle

boom, 500m reach


single bell

• 1x18 man HRV

• ROV: 1x Obs-ROV


• Operation area:

UK/DK and WW

Discovery

• Built: 1990

• Owner: Subsea 7

• L:125m, B: 20m




• 1x18man HRV

• ROV: 1xROV

• ACC: 97 persons

• Operation area: UK/DK/WW

Acergy Harrier

• Built: 1985

• Owner: Subsea 7

• L:83m, B: 19m


• Crane SWL: 2x60Te SWL


• 1x18man HRV

• ROV: 1xROV

• ACC: 86 persons

• Operation area: Brasil (WW)

Acergy Eagle

• Built: 1997

• Owner: Subsea 7

• L:138m, B: 20m




• 1x18man HRV

• ROV: 2xWROV


• Operation area: UK/DK (WW)

DSV Fleet (WW)

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Hyperbaric Welding Systems -Introduction

• Subsea7 own and operate 3, Hyperbaric Welding Systems. Each system consists of a Habitat, services umbilicals, welding umbilical, hydraulic umbilicals hydraulic power units, hot water machines, containerised Habitat/Weld Control, workshops, equipment stores, pre heating systems, (induction heating invertors for SH2), general stores, consumables and stand alone, electrical generators, as and when required. Finally, each system has 3 x hydraulically powered, pipe handling frames, PHF’s , which facilitate up/down, left/right movements of pipeline or spool piece, one of the PHF’s, has push/pull capability, for spool piece installation and final welding fit up.

• All three systems can accommodate pipes, ranging in diameter , from 6”/ 153mm to 42”/1067mm.

• The systems are operated in Saturation Diving mode (Heliox) , and can work in water depths ranging from -15msw to -300msw, (CHAS -200msw). However, the vast majority of Client, Hyperbaric Welding Projects, have taken place in water depth ranges, -20msw to -185msw.

• 2 x Seahorse, Habitat Pipeline Welding Systems, Seahorse 1 and 2 can perform standard tie ins and Emergency Pipeline Repairs and are rated to -300msw working depth.

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S7 Hyperbaric Welding Projects 2012/2013

Dolphin Energy, Qatar, 2012 Emergency Pipeline Repair System, EPRS.

• Canadian Natural Resources, CNR, UK 2012 Modular Habitat and Ninian Brace Repair.

• Conoco Phillips, Norway, 2012 Ekofisk VB Water Inj Tee installation.

• Conoco Phillips, Norway, 2013 B11 Platform Bypass.

• Conoco Phillips, Norway, 2013 Eldfisk Tie in

• Shell,UK, 2013. Brent A Bypass

• For information only, Hot Tap capability, no project.

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Hyperbaric Welding Subsea 7 CHAS (Combined Habitat Alignment System)

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Seahorse

Max 42” OD

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North Sea, UK, 2007. Structure 30yrs Service. Brace parted, @ -45msw, 1.2dia x 50mm wt. Project Specific Habitat

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Dolphin Energy, Qatar.

Subsea7 design and to build 1219mm dia, (48”), Seahorse, Hyperbaric Habitat, EPRS capability. Ongoing.

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Hyperbaric Welded Branch Tee, Hot Tap.

1994 First, HT achieved with Induction Heating, there by maintaining production through out operations.

Wintershall, Netherlands.

16” Branch on to 36” Gas pipeline, -30msw.

Shallowest, S7 HT, -30msw

Deepest, S7 HT, -140msw

12” Branch on to 30” P/line

18” Branch on to 36” P/line

S7 have performed 7 HT’s, with No Weld Repairs.

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SH2, Hot Tap Habitat, with “Top Hat” for B/V Assembly Stowage

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Hyperbaric welding-Methodology

Lift of the north section to perform the first weld:

Lift and shift of the south section to perform the second weld:

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Hyperbaric welding-Methodology

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seabed-to-surface

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