THE WORLD LEADING DECOMMISSIONING SPECIALIST

Basics of decommissioning cutting

techniques and their use in completed

projects

Norse Cutting & AbandonmentNorse Cutting & AbandonmentNorse Cutting & AbandonmentNorse Cutting & Abandonment

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SPECIALISTKey Facts about the NCA Group

• Established in 1999

• A continuation of Norse Cutting that started its operations in 1989

• Service provider to the oil and gas industry within:

– Maintenance and Modifications

– P&A and Decommissioning

– Mooring Services

• Strong technology focus – holds a number of international patents

• Main office: Stavanger, Norway

• Estimated revenues 2007: approx. 75 mill USD

• Average revenue growth ‘00-’07: 70% per year – all years profitable

• No LTA on client projects in company history

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There is a market for cutting experts (please!)

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SPECIALISTCriteria

Cost efficiency

Environment Capacity

within a SAFE working envelope

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SPECIALISTNCA Group Service Range

Project Management - Turnkey Projects - Integrated Services

• Rig mooring

• Pre-lay mooring systems

• Special mooring arrangements

• Towing and lifting operations

• Spooling

• Inspection services

• Rental and sales

• Engineering and analysis

Maintenance and Maintenance and Maintenance and Maintenance and

Modification ServicesModification ServicesModification ServicesModification Services

A Provider of Specialized

M&M Services

P&A and Decommissioning P&A and Decommissioning P&A and Decommissioning P&A and Decommissioning

ServicesServicesServicesServices

The World Leading

Decommissioning Specialist

• Multistring conductor removal

• Pile & conductor cutting

• Subsea wellhead removal

• Pipeline, riser and caisson cutting

• Subsea cutting

• Conductor slot recovery

• Jacket cutting and splitting

• Plugging with ThermaSet®

Mooring ServicesMooring ServicesMooring ServicesMooring Services

A Complete Provider of

Mooring Solutions

• Cold cutting services

• Onsite machining services

• Flange Facing services

• Hot Tapping and Line Stoppling

• Leakage sealing services

• Planning and management of maintenance shutdowns

Engineering Services – Tool Development – Research and Development

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SPECIALISTA Global Service Provider

Operational base

Sales officeAgent

Regions where NCA has performed operations

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P&A AND DECOMMISSIONING SERVICES

A “One-Stop-Shop” for Cutting Services

Cutting of multistring

casing below seabed

Cutting of piles

below seabed

Cutting of jacket legs

and cross bracings

Sectioning of

multistring casing

Cold cutting of hydro-

carbon and NORM

piping

Sectioning of

topside modules

Cutting Access for cleaning

Cutting Access for lifting

Cutting of risers

and J-tubes

Splitting of jacket/

substructure

Cutting of pipelines

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SPECIALISTAWJC - Working Principle

The high pressure pump (diesel powered) supplies water <45 , 95> ltr/min @ typically <600 ,1400> bar to the “mixer”.

Inside the mixer the HP flow is directed via a pressure vessel containing the abrasives (copper slag). The water and solids (two phase flow) leaving the mixer is directed to the cutting tool, in this case via an umbilical (slurry cutting).

There is typically 1 hour worth of abrasives inside a pressure vessel. When emptied it will be de -pressurized and refilled from the storage on top of the container.

There is a series of AWJC systems on the market and NCA has its own as well as off-the-shelf-systems.

NCA uses it’s heavy duty system for sub sea cutting (inhouse design) .

HP pump

Mixer

Umbilical

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SPECIALISTWorking Principle

The cutting technology

Abrasive Water Jet Cutting is well developed and used by numerous companies all over the world. The cutting technique can be compared to sand blasting with two fundamental differences:

-The carrier fluid is water

- The jet (particle flow) is concentrated

Testing and design

NCA spends significant resources each year for testing and design of AWJC technology including improvements of the basic spread, the tooling packages and cutting techniques. NCA’s results from internal cutting of multistring conductors using AWJ is unmatched in the industry.

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AWJC profile (Frigg DP 2, 2004)

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SPECIALISTChip cutting - Working Principle

Guillotine saw cutting or rotating steel based

tools.

Remove the material by removing fragments or

lengths (chip or swarf).

Whilst the rotating cutting steel principle has a

limitation in wall thickness and material, the

guillotine saw will cut string and contents

simultaneously.

Chip cutting tools are normally equipped with a

feeding mechanism and is often suitable for

remote operation.

NCA has a in-house patented guillotine saw

design. Other chip type cutting tools is readily

available off the shelf .

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Diamond Wire Cutting

• 2 main principles of tools:

– 1. Variable loop system with wire tensioning

– 2. Fixed loop system with hydraulic feeding

• Advantages

– Works well on both single string, multistring, composite or solid materials

– Flexible with respect to different shapes to be cut

• Disadvantages

– Vulnerable to compression

– Not cold cutting – creates sparks

• Fixed loop systems are available for ROV installation.

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Diamond wire – Variable and fixed loop system

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Hydraulic shear

• Available in sizes up to 48”

• Advantages

– Powerful

– Works on cement and steel

• Disadvantages

– Vulnerable to collapse in pipe (small wall thickness)

– Very heavy

– Operational limitations offshore (installation heave)

– Large power pack required

• Cutting time

– Typically < 90 sec

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REFERENCE PROJECT

Maureen A Decommissioning

• Project description: Inshore decommissioning of large productionplatform with steel substructure and storage tanks

• Vessel: Asian Hercules, Eide Lift 1, Scuba

• NCA delivery: Specialised cutting services – subsea and in air– Abrasive waterjet cutting of jacket legs and bracings

– Mechanical cutting of bracings

– Cold cutting of LSA pipes

– Abrasive waterjet cutting for splitting of modules

– Abrasive waterjet cutting of oil storage tanks

– Engineering and manufacturing of purpose built equipment

• Project results:– Approx. 15.000 manhours

– 0 LTAs

– Approx. 300 surface cuts made

– Approx. 30 subsea cuts made

• End Client: Aker Stord

• Timing: 2002-2003

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REFERENCE PROJECT

Ekofisk P&A Campaign

• Project description: Abandonment of approx. 100 wells from 5

wellhead platforms in NS on approx. 300ft water depth

• NCA delivery: Removal of conductors – AWJC of multistring conductors below seabed

– Jacking of multistring conductors

– Conductor cleaning

– Surface securing and sectioning of conductors

– Engineering and project management

• Project results:

– Approx. 15.000 manhours

– 0 LTAs

– Approx. 1000 cuts made

– Approx. 1500 antistripping pins installed

• Client / End Client: Odfjell Drilling / ConocoPhillips

• Timing: 1999-2005

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REFERENCE PROJECT

NW Hutton P&A Campaign

• Project description: Abandonment of 40 wells from large production

platform in NS on approx. 400ft water depth

• NCA delivery: Surface sectioning of conductors – Conductor cleaning

– Surface securing and sectioning of conductors

– Handling and laying out conductors

– Engineering

• Project results:

– Approx. 13.000 manhours

– 0 LTAs

– Approx. 640 surface cuts made

– Approx. 1200 antistripping pins installed

• Client / End Client: Weatherford / BP UK

• Timing: 2003-2004

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REFERENCE PROJECT

Frigg DPII P&A Campaign

• Project description: Abandonment of 24 wells from wellhead

platform in NS on approx. 340ft water depth

• NCA delivery: Removal of conductors – AWJC of multistring conductors below seabed

– Jacking of multistring conductors

– Conductor cleaning

– Surface securing and sectioning of conductors

– Engineering and project management

• Project results:

– Approx. 6.000 manhours

– 0 LTAs

– 8 AWJC sub mudline cuts made

– Approx. 300 surface cuts made

– Approx. 600 antistripping pins installed

• Client: Total

• Timing: 1999-2005

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REFERENCE PROJECT

Frigg Decommissioning Of Topsides

• Project description: Decommissioning of 5 large topsides from NS

field

• NCA delivery: Specialised cutting services– Abrasive waterjet cutting of deck plates

– Abrasive waterjet cutting of tanks

– Diamond wire cutting of module footings

– Diamond wire cutting of tanks

– Cold cutting of pipes

• Project results:

– Approx. 7.000 manhours

– 0 LTAs

– Cut approx. 50 module footings

– Numerous piping cuts

– Misc. cutting of flare booms, structures, tanks etc.

• Client/End Client: Aker Kvaerner / Total

• Timing: 2004-2006

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Frigg TCP2 & TP1 Removal of External Steel

• Project description: ROV based cutting and removal of 1000T of

external steel from concrete shafts (risers, supports, sheave

assemblies etc.)

• All work performed from topside

• NCA delivery: Specialised cutting services – subsea and in air– Abrasive waterjet cutting – internal cutting tools for riser cutting

– ROV operated Subsea Guillotine Saws

– ROV operated Hydraulic Hole Cutting Tools (for making lifting holes)

– ROV operated AWJC External Cutting Tools

– Engineering and manufacturing of purpose built equipment

• Project results (so far):

– Approx. 7.000 manhours

– 0 LTAs

– Approx. 100 surface cuts made

– Approx. 500 subsea cuts made

– Approx 100 lifting holes made

• Client/End Client: Deep Ocean / Total

• Timing: 2004-2006

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Frigg DP I Removal of Jacket Wreck

• Project description: ROV based cutting and removal of 10.000T

steel jacket in NS on 360ft water depth

• Vessel: Norman Cutter, Saipem 7000

• NCA delivery: Subsea cutting services

– Abrasive waterjet cutting - double spread for parallel operations

– ROV operated AWJC External Cutting Tools up to 72”

– ROV operated Subsea Guillotine Saws

– Engineering and manufacturing of purpose built equipment

• Project results (so far):

– Approx. 8.500 manhours

– 0 LTAs

– Approx. 100 subsea cuts made

• Client/End Client: Sonsub / Total

• Timing: 2005-2007

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Kursk Salvage

• Project description: Salvage of the Kursk

• Vessels: DS Mayo & Giant4

• NCA delivery: Subsea cutting services– Abrasive waterjet subsea cutting – double spread for parallel operations

– Development of methods for orecision cutting of lifting holes

– Engineering and manufacturing of purpose built equipment

• Project results:– Approx. 8.000 manhours

– 0 LTAs

– Approx. 100 subsea hull cuts made

– 26 precision cut lifting holes made

• Client / End Client: Mammoet Smit / The Russian Federation

• Timing: 2001

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REFERENCE PROJECT

Hurricane Restoration Project - GoM

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REFERENCE PROJECT

Hurricane Restoration Project - GoM

• Project description: Cutting services for up to 20 hurricane

damaged platforms in the GoM

• Vessels: Kestrel, Man O’ War, Kallop, Whale Shark

• NCA delivery: Specialised cutting services– Abrasive and mechanical cutting of subsea debris

– Abrasive waterjet cutting of multi-string conductors below mud line

– Abrasive waterjet cutting of piles below mudline

– Surface pinning and sectioning of multi-string conductors

• Project results (so far):– More than 20,000 manhours

– 0 LTAs

– Cutting and removal of numerous multi-string conductors

– Cutting of several 10 3/4” to 39” multistrings from the inside

– Cutting of several 7/8” to 36” multistrings from the inside

– Numerous subsea piping and structural cuts

• Client: Chevron

• Timing: 2006 (ongoing)

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REFERENCE PROJECT

Recovery After Offshore Blowout and Fire

• Project description: Securing wells, and decommissioning topsideafter blowout and fire on wellhead platform in Mediterranean Sea

• Vessels: Polar Prince, Seaway Hawk, Pertinacia

• NCA delivery: Specialised cutting services– Abrasive waterjet cutting – single spread

– ROV operated AWJC Cutting Tools

– Diamond wire cutting

– Surface sectioning of multistring conductors

– Cold cutting and bevelling of casing, preparing for installation of wellheads

• Project results:– Approx. 7.000 manhours

– 0 LTAs

– Numerous subsea cuts made

– Recovered one multistring conductor

– Installed 8 wellheads

• Client/End Client: NN

• Timing: 2004-2005