NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Aasta Hansteen – A Pioneer in

Norwegian Deepwaters

Helge Hagen

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Aasta Hansteen area development

Snefrid Sør

Luva

HaklangPolarled

Gas export

Aasta Hansteen spar FPSO

Aasta Hansteen – Pioneer in Norwegian deep waters

A strategic development• opening a new gas region• extending NCS gas infrastructure• securing long term gas supplies

to Europe• 300km from shore

500km from Nyhamna1.300m water depthDeep water/harsh environment

• 51 billion Sm3 Gas

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Aasta Hansteen – harsh weather conditions

• Combination of waves and current

exceeded experience to date on

NCS

• Uncertain weather forecasting

and Polar Lows

• High fatigue loads

• Limited installation seasons

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

• Deep water 1300m water depth

• Harsh weather conditions

• Seabed temperatures -1.5 Deg. C

• Remote location

• Soft soil conditions

• Development of world’s largest spar and first spar FPSO

• Need for new technology

Classif

ication:

Aasta Hansteen – Pioneer in Norwegian deep waters

Main challenges

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Deep water, harsh weather and remote distance – what does it mean on Aasta Hansteen?

Typically 300m field Aasta Hansteen

Weight of lifting wire template inst. 20-25tons 100tons

Launch/recover ROV 20-30min 2hours

Vessel sailing time to shore 3-4hours 12-16hours

Seabed temperature 2-4 deg. C -1,5 deg. C

External pressure/hydrostatic head 30bar 130bar

Installation guiding Guide wires Guide wire less

Risers Flexible SCR’s

Workover system Standard New deep water standard

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Floater concept selection

➢ Key parameters for floater concept at Aasta Hansteen:• Deep water and harsh environment (1300m)

• Distance from shore (300km)

• Gas export via the Polarled pipeline to Nyhamna (500km)

• Need for condensate storage and offloading (500m3/d)

• Floater concept is a combination of hull, mooring and riser seen as one system

→ A feasible riser concept (SCR) drives the selection of hull and mooring

7 | Aasta

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019Classif

ication:

Aasta Hansteen – Pioneer in Norwegian deep waters

Selected concept

Snefrid Sør

Luva

HaklangPolarled

Gas export

Aasta Hansteen spar FPSO

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

What is new:- Monopile foundation- Toast rack template with levelling system- Guidewire less system - New deep water workover system

9 | Aasta

Subsea Production System

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Overall construction work and marine operations schedule

10 | Docum

Aasta Hansteen – Pioneer in Norwegian deep waters

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 201911 | Docum

Aasta Hansteen – Pioneer in Norwegian deep waters

Norway Marine Operations

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

2015 2016 2017 20182014

• Suction Anchors• Structures, Umbilicals &

Jumpers• Tie-in

21/4 29/8

• Pre-installation of mooringLines

• Flowlines, Spools, SCRs

• Tow• Mooring Hook-up• SCR pull-in

BB WorkerAHT3Siem Opal

AHT1Skandi Vega

AHT2Normand Ranger

AHT4 Normand Prosper

AHT5 Skandi Iceman

Skandi Skans

en

Olympic Zeus

27/54/428/5 13/11

Seven Arctic

• Fiber-Optic Cable

MærskRecorder

Aasta Hansteen – Pioneer in Norwegian deep waters

• Rock inst.

12 | PRD Marine Experience Day

Offshore marine operations – 5 seasons

In total approx. 1500 vessel days for Aasta Hansteen – offshore and inshore

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

Aasta Hansteen – Pioneer in Norwegian deep waters

The journey to the final destination

20m clearance to cable

Draft 182m

Height 157m

14m clearance to seabed

NOVOTEL LONDON WEST • LONDON, UNITED KINGDOM • 2-4 APRIL 2019

• Keep the marine operations within the Summer season 1 May – 1 September

• Focus on contracting strategy work – get the right contractor to the work – early involvement – Good cooperation

• High attention to the preparations for marine operations - shorten installation windows

• If you plan well you will get the good weather☺

14 | Docum

Aasta Hansteen – Pioneer in Norwegian deep waters

Key learnings from deep water/harsh environment

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