World First: Deep Water Floating Drill Operation Successfully Completed

Large Diameter Drilling (LDD) and the Acteon Group have combined their expertise to complete a World first.

Large Diameter Drilling (LDD) and the Acteon Group have combined their expertise to complete a World first: drilling operations from a diving support and construction vessel (DSCV) in water depths in excess of 270m on a seabed slope of 17 degrees. By integrating LDD’s reverse circulation LD2500 drill rig with a motion compensation platform, LDD have successfully completed the installation of seven anchor mooring piles for a Catenary Anchor Leg Mooring (CALM) Buoy – with the technique employed, whilst unique and bespoke, having the potential for industry wide application.

The Project (Limetree Bay Installation) was executed in the Caribbean Sea, circa. 2km off the coast of St. Croix, USVI, for Imodco Terminals, a subsidiary of SBM Offshore. The Project was exceptionally challenging; operational and environmental constraints limited the use of alternative methods. The LDD devised solution mounted the LD2500 to a cantilever beam which was subsequently affixed to the Barge Master T700 motion compensation platform.

The equipment spread was mobilised on-board DSCV SBM Installer during Q1 2019 in Rotterdam, after which she sailed to St. Croix, USVI. The Project works, namely the installation of seven anchor piles, were successfully completed by LDD to the client’s satisfaction – this included not only the drilling element, but also the design and engineering pertaining to installation, pile handling and anchor grouting elements.

The multi Op-Co project involved the coming together of 9 companies within the Acteon Group allowing for a seamless delivery with a single point of contact for the entire installation package.

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