A SALVOR’S APPROACH TO

DECOMMISSIONING

R E N I E R V A N D E N B I C H E L A E R - C C O A R D E N T

ARDENT

VALUE CREATION THROUGH 3 PILLARS

• Emergency Preparedness

• Emergency Response

• Oil Spill Response

• Disaster Relief

Emergency Management Wreck Removal / Projects Offshore Decommissioning

• Wreck Removal

• Oil Recovery

• UXO Removal

• Shipyard specialty services

• Turn-key Decommissioning

• Topsides & Jackets Removal

• Subsea Structures Retrieval

• Floaters Disconnect & Tow

COSTA CONCORDIA WRECK REMOVAL

REFLOATING A COLLOSUS

• Island Giglio, Italy 2012 - 2014

• 41m depth, 114,147 gross ton

• Parbuckling, refloating, tow & delivery of

Costa Concordia in one piece

• 530 people, 7 dedicated teams

• Wreck mostly recycled

• Similar spread to oil & gas (decom) project

METHODOLOGY

INNOVATIVE APPROACH

Holdback System and

Stabilisation

Underwater Support

and Portside

Sponsons

Parbuckling

Starboard Sponsons Refloating

(construct to destruct)

33kte

METHODOLOGY

SEQUENCE OF EVENTS

Making Safe

Preparations for Parbuckling

Final Prep & Parbuckling

METHODOLOGY

SEQUENCE OF EVENTS (CONT.)

Fabrication & Installation of Buoyancy Tanks

METHODOLOGY

SEQUENCE OF EVENTS (CONT.)

SB Side Buoyancy Tanks & Refloating

Refloating, Tow & Delivery

JACK UP REMOVAL

LARGE PIECES, RESTRICTED ACCESS

• Offshore jack-up platform, suffered a

punch-through and sank next to live

wellhead platform off the coast of Mexico

• The hull of the platform (7,000t) was

buried 26 meters into the mud, a mere 2

meters away from the wellhead platform

• ITT to completion: less than 1 year

o ITT launched Dec ‘15

o Tender submitted Feb ‘16

o Award of contract Mrch ‘16

o Start of work Apr ‘16

o Project completion Nov ‘16

JACK UP REMOVAL

APPLIED INGENUITY

• Subsea guillotine to cut the

hull into manageable pieces.

• Unique giant hydraulic grab to

quickly and safely lift the large

pieces.

• 2016 world’s largest salvage

contract completed within one

season and on budget.

CROSS SECTOR TRANSFER

FROM SALVAGE TO DECOM

• Extensive experience globally

• Challenges overcome:

o Environmental sensitivity

o Safe preparations

o Multiple stakeholders management

o Damaged or unknown condition

o Challenging logistic chains

o Safe disposal

o Dynamic planning and scheduling

F I N D I N G T H E S O L U T I O N

THE PROCESS

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SOLUTION: ONE & TWO

VERTICAL REFLOAT & TOPPLING AND REMOVAL

Jacket removal concept #1:

• Buoyancy in legs / Vertical refloat

Jacket removal concept #2:

• Toppling and lifting jacket

SOLUTION THREE:

FLOTATION

LIFTING WITH BUOYANCY

MODULAR LIFTING CONCEPT

• Modular system: Usable for most Jackets

• Closed A-Shape Design

• Divided in several compartment / tanks

• Clamped onto straight vertical side of the Jacket

• Jacket Structure is able to bear the imposed forces

and moments

• Sufficient stability due to adequate water plane area

at all steps of operation

• System is able to turn the Jacket horizontally (overall

360˚ possible)

CAISSON DESIGN KEY FEATURES

THANK YOU