Description

Subsea Decommissioning - Kittiwake Loading Buoy Removal

Client / End Client:

AF Decom Offshore / Venture Productions plc

Period:

Contract award January 2008 / Offshore Campaign August 2008

Vessels:

Volantis

Location:

UK waters, Kittiwake field, water depth 85 m

ROV:

2-off WROV systems

Equipment:

Various types of cutting tools, reel for mooring lines and risers, subsea baskets for safe lifting, hydraulic grab, dredging tools

Scope of Work:

DeepOcean provided the construction vessel equipped with 2 off WROV-systems, associated equipment and personnel together with onshore engineering and project management services.

The DeepOcean scope of work consisted of as follows:

• Removal of 8 off 1100m long anchor lines
• Handover of the loading buoy to tug vessels
• Removal of 2 off flexible risers and of 1 off control umbilical
• Removal of mid-water arch including clump weights
• Removal of PLEM
• Removal of concrete mattresses
• Removal and plugging of rigid spool

The project with a total removal of approx 750 Te of subsea structures was successfully completed, in shorter time than scheduled without any injuries to neither personnel nor equipment.