Our experts and partners can help you extract more value and plan the most cost-efficient way to decommission your assets

1. intecsea.com
Decommissioning your offshore assets
June 2020

2. Time to decommission?
Decommissioning your offshore assets 2
• We can help you protect your asset to the end of
the lifecycle
• Provide a safe and smooth transition from
production to commissioning
• Our experts and partners can help you extract
more value and plan the most cost efficient way
to decommission your asset
Are your offshore assets showing their age?
Is it time to end or extend?

3. When it is time to retire,
we provide safe removal of
all waste structures in cost-
effective ways
Decommissioning your offshore assets3

4. Decommissioning your offshore assets 4
What we do
Environmental
Impact Studies
Comparative
Assessment
Front End
Pilot Studies
Concept
Development &
Detailed Project
Planning
Detailed
Regulatory
Planning
Engineering
Support for all
Stages
Estimation of
Asset Retirement
Obligation

5. Almost
60,000
people in over
50countries
Over
25
years of international
decommissioning
projects
Decommissioning your offshore assets 5
Global decommissioning experience
Over
30
decommissioning
studies in the last
5 years
with
80
decommissioning
specialists

6. Decommissioning your offshore assets 6
25 years of decommissioning experience
Brent Assets Forbes AW Leman BK Brent Spa Heather Alpha Maureen Alpha NW Hutton Eider
E&C Services
Brent Redevelopment
Offshore Execution
Module removal /
installation
Onshore Support
Management
Offshore Execution
Platform removal
E&C Services, FEED to
Execution
Offshore Execution
Platform removal
Decommissioning /
Re-use Study
Decommissioning
Study
Decommissioning
Study
Onshore Disposal Cost
Estimate
Decommissioning
Study
E&C Services –
transition to Lighthouse
Mode
Offshore Execution
Wytch Farm Heather Alpha Camelot CB Frigg & MCP 01 Brent Assets Buzzard Ekofisk ALBF Brent Assets Jolliet TLWP
Decommissioning
Study
Cost Estimate
Decommissioning
Study
Platform re-use
engineering
Decommissioning
FEED
Material inventory of
all Brent assets for
decommissioning
Decommissioning
Cost Estimate
Decommissioning
FEED
Structural Integrity
Assessment to allow
single lift
Decommissioning Study
Cost Estimate
Global Global Britannia Valhall Sullom Voe Mossmorran Lemon Grangemouth NS Assets Brae Alpha TLP
Global waste
footprint Study
Generic cost
modelling for oil spills
Decommissioning
Cost Estimate
Decommissioning
Management Services
BAT, Environmental
and Air Quality
assessments
Air Quality & Flare
Impact assessments
BAT & Environmental
assessments
BAT, Environmental
and Air Quality
assessments
Development of a
framework procedure
to ensure compliance
with PPC regulations
Concept engineering
study for drill rig
removal
Drill rig decommission
& removal Cost &
Schedule Estimate
Americas generic TLP
removal study
Buchan SNS Assets Dunlin Sable Brae Assets Brent Assets Kuito FPSO Jolliet TLP GoM Assets Tarsuit Island SNS
Development of a
recycling
methodology
Recycling Cost &
Schedule Estimate and
Execution Strategy
E&C Services
Brent Redevelopment
Offshore Execution
Module removal /
installation
E&C and O&M
Services
Post CoP
Offshore Execution
Module & Equipment
removal
PEER Review of
pipeline pigging and
flushing procedure
Development of a
Late life decision
roadmap for the Brae
Assets
Structural analysis,
engineering, method
statements, resource
estimates and activity
schedules for the
cleaning and hook-
down activities for the
removal of the Brent
assets
Riser & mooring
release studies and cost
estimates for FPSO &
Calm Buoy
Supervision of NORM
removal
Refresh of the original
technical
decommissioning
submission to BSEE
Develop SoW document
for supply chain
engagement
Development of a bi-
lingual benchmarking
study that included a
detailed review of
global best in class
decommissioning
options and legislative
regimes
Removal of island
drilling and
production facilities
EPRD Removal and
recycle of 2 x platforms
Yoho FSU Xikomba Block 15 Chinguetti ST 301 OLOWI FPSO MPOG Riser VK826 GP3 Irish Sea Rig to Reef Study Chevon Thailand
Undertake a detail
riser/morning release
study. Establish
methods of flushing and
cleaning.
Station keeping during
disconnection Towing
study’s Detail Transit
Ballasting study.
Development of
options to release and
wet store the risers &
control umbilical's from
the FPSO. Study for the
flushing of production
risers & flowlines. Study
for the flooding of water
injection jumpers &
wells from the FPSO
Conduct a critical
technical reviews of
Decommissioning
Study's & Cost
Estimates. Study
scenarios for
abandoning wells and
the prospect of future
well recovery
Conduct a critical
technical reviews of
Decommissioning
Studies & Cost
Estimates
Modifications to
existing assets included
lowering the existing
lines, creating five
subsea tie-ins and
decommissioning &
abandoning unused
portions of the existing
pipelines
Investigate the
options to release the
risers from the FPSO.
Provide preliminary
cost estimate for the
various options
Provide detailed
procedure for the
preferred options
Development of riser
& equipment mothball
plans, cost estimates &
schedules for MPOG
equipment
Decommissioning
including Comparative
Assessments and
Decommissioning
Programme
development
EPRD – remove and
relocate topsides
modules of 2 platforms
Concept Study for
RTR
Concept Study for RTR
for 8 WH platforms
Topside re-use study
Project management
Engineering
Execution
Studies
Environmental
1990sPresent

7. Case studies
Decommissioning your offshore assets 7

8. Case Study 1
Decommissioning your offshore assets 8
The client wanted to learn about the global decommissioning market to
implement a strategy of its own.
We delivered a bilingual benchmarking study that included:
• Global overview of decommissioning experience including a database of
sample projects
• A comparison of regional regulatory frameworks
• Typical contracting strategies employed
• The main contractors who provide well P&A and platform removal
services
• Cost and schedule metrics
• Recommendations for contracting strategies and business models
• Recommendation for implementation of Mexico-specific
decommissioning regulations
Decommissioning Planning & Consulting Services – Client: Confidential

9. Case Study 2
Decommissioning your offshore assets 9
The client requested options for decommissioning the following facilities:
Decommissioning Options Evaluations – Client: Confidential
• Export Pipeline
• Downstream SSIV to KP380
• Facilities
• Fixed facilities: 3x platforms, flare
bridge, FSO
• Subsea: wells, XTs manifolds,
umbilicals, SDU
• Infield pipelines: pipelines, risers,
tie-backs
• Others: Buoys, concrete mattresses,
etc.
We provided:
• Grounding: Review of the facilities and all decommissioning options
• DOE Framework: Alignment on process and DOE screening basis
• Options screening: High level options review to identify any potential
showstoppers
• Comparative assessment: structured decommissioning options screening

10. Case Study 3
Decommissioning your offshore assets 10
The Chinguetti Field is located approximately 80km west of Mauritania in about
800m of water depth.
We provided the following:
• A critical environmental and technical review of the field operators proposed
abandonment plan. Provided the government with sufficient information for
the approval, modification or rejection of the abandonment plan.
• Examination of financial aspect of abandonment by presenting benchmarks of
similar projects and pointing to potential cost reduction.
• Consideration of possible scenarios for abandoning wells and the prospect of
future well recovery.
• Technical assistance and specialist personnel to the client throughout the
project implementation phases.
Decommissioning Consultation Services – Client: Confidential

11. Sumarno Umar
For Technical Matters
M: +65 98310 210
E: umar.sumarno@intecsea.com
Ngo Nguyet Tran
For Sales Enquiries
M: +65 9082 4356
E: nguyettran.ngo@intecsea.com
John Cox
Global Decommissioning Manager
M: +1 281 5072 121
E: john.cox@intecsea.com

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