Island Offshore pioneers new drilling techniqueNews // September 17, 2014
Island Offshore's new vessel Island Performer has begun using coiled tubing drilling technology in the Boknafjorden north of Stavanger.
At the beginning of 2014 Island Offshore and partner Baker Hughes entered a back-to-back agreement with VTT Maritime who had been awarded a contract for ground core sampling for what is to be the world’s longest (25.5km) and deepest (385m) subsea road tunnel, Rogfast.
Together with end client Statens Vegvesen, (the Norwegian Public Roads Administration), it was decided that Island Offshore’s new coiled tubing drilling method should be applied. Island Performer recently started work using coiled tubing drilling in the Boknafjorden.
The technique can be used to construct high angles in the well over a very short distance (up to 15 degrees over a 30m drilled hole). In order to avoid the need for a full marine riser spread, a subsea injector has been developed by Island Offshore. A second injector is installed on the vessel in order to keep the coiled tubing between the subsea injector and the vessel in tension.
A total of approximately 440m of core samples will be taken from four locations in order to obtain detailed information about the geological conditions of the tunnel route, with water depths ranging from 200m to 300m.
Island Offshore said this is the first time that an open coiled tubing system has been used in a drilling operation offshore. New equipment and procedures have been developed in order to introduce a reliable, functional system.
Having completed one and recently started on well number two of the four wells contracted, Island Offshore and Statens Vegvesen believe that this drilling method paves the way for a unique and efficient method of core sampling.
"Statens Vegvesen is delighted to see the way an experienced oil and gas contractor such as Island Offshore has utilized and safely operated this advanced technology in a new application," said Tor Geir Espedal, Area Manager – Rogaland, Statens Vegvesen.
“This project provides Island Offshore a unique opportunity to qualify and test new technology and equipment that can contribute to the development of the light well intervention services currently performed by Island Offshore," said Robert Friedberg, Managing Director, Island Offshore Subsea AS.
"In addition, we see a number of other applications of this technology – such as pumping/acidizing, plug and abandonment and advanced core sampling. We will now offer this technological breakthrough to the market," he concluded.