Tighter source specs for 3D operations and most of all 4D operations require active source steering to maintain proper control of source positioning. Polarcus has developed a new source steering system based on subsea winches attached to the 2 outer source strings. The winches will adjust the lengths of spreader ropes connecting the outer source strings with lead-ins.
Polarcus has contracted 3DP Modeling AS for detailed design and manufacturing of a prototype source steering using subsea winches as shown on the illustration below.
Operational testing of prototype source steering system is scheduled to take place in August 2011 onboard one of the Polarcus vessels.