Conoco Viking Vulcan Decommissioning

Derrick Services UK Limited were awarded a work package to support Royal Boskalis with Decommissioning Support Services including all above water leg cutting throughout the 2019 multi-phase Southern North Sea Decommissioning Campaign.

7 Jackets & 4 Topsides were successfully removed from the field and transported ashore for dismantling.

Robust planning, comprehensive pre-works & the adoption of a one team philosophy were a significant element that contributed to the successful project execution.

DSL personnel executed over 38,000 Man-hours on the project (Rope Access & Non Rope Access) without a LTI, this is a credit to all involved in the project including offshore personnel, & the robust onshore support structure.

• Installation of Spider Deck Access
• Cutting & Removal of Caissons and Risers
• Cutting Penetrations for Rigging
• Installation of Fairlead Bollards
• Sling Path Clearance
• Topsides Lift point (Trunnion) Installation
• Topside Separation Cuts at El +17.3
• External Pile Cutting
• Cutting and Removal of Leg extensions at El+7.9
• Installation of Rigging and Steering Wires
• Rigging & Cutting platform Installation
• Sea Fastening of Topsides and Jackets

Project Description

The work scope involved numerous work tasks in what were challenging conditions spanning;

• Onshore Project Management
• Engineering & Fabrication
• Redundant equipment removal
• Installation of lifting points
• Caisson, Riser & J tube Removal
• Sling path Clearing & Air Gapping
• Leg Cutting Platform Installation
• Leg Cutting (Oxy Acetylene)
• Offshore Construction Services
• Rope Access Personnel (Welders, Platers, Pipe-fitters, Riggers, E&I)

Services Provided

• Project Planning
• Engineering and Fabrication
• Rope access Personnel and Equipment
• Offshore Construction Services
• Redundant Equipment Removal
• Communication Tower Removal

Benefits to the client

• Multi-disciplined personnel on the asset creating efficiencies
• Collaborative approach between Client, Construction Contractor and HLV contractor
• Open discussions leading to innovative ideas resulting in cost and time efficiencies
• Open sharing of Information between all parties

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