Directional core drilling from drillship

Worlds longest and deepest

When completed E39 Rogfast will become the worlds longest and deepest subsea road tunnel. In order to analyse the rock formations several methods were used, including seismic survey and core drilling from shore and core drilling from drillship. This project involved the part involving drillship.

From drillship

Due to distance from shore and sea depths the area between Kvitsøy and Bokn had to be drilled from drillship, and VTT Maritime devised a concept for this operation, and chose Island Offshore to as main contractor for the job.

The directional core drilling was done by means of an innovative Coiled Tubing drilling technology (equipment & work process) performed by Island Offshore from their newest Offshore Construction and Light Well Intervention vessel, Island Performer.

The first part of the job involved seabed survey on the intended drilling locations, including retrieval of seabed rock samples. This was performed by the vessel Island Valiant. Subsequently three holes were drilled with Island Constructor in locations specified by the client and core samples were retrieved and delivered to the client for further analysis.

What we did

We managed the project and the subcontractors on behalf of the client, including on-board supervision and representation.

Norwegian Public Road Administration
The Boknafjord
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