VLAARDINGEN, The Netherlands -- The drillship Aban Abraham has successfully completed seatrials after major upgrade work performed at Sembawang Shipyard. Dutch design office Ulstein Sea of Solutions has been responsible for the concept and basic design of the upgrade to operate the DP vessel in deeper waters up to 6,600 ft (2,011 m).
The upgrade work on the Pelican-class vessel, owned by Aban Abraham Pte. Ltd., included widening of the beam by adding sponsons on both sides of the drillship to compensate for additional weight and provide sufficient buoyancy.
The vessel's capacities for riser tensioning, riser storage, riser handling, and mud storage has subsequently increased significantly to deal with the increased water depth. The upgrade also involved a new substructure with an increased drillfloor height and an increase in power generating capacity including a complete new power distribution and automation system.
As a future DP upgrade with two azimuthing thrusters has been envisioned, space reservations have been made in the sponsons for installation of the thrusters and provisions have been made in the electrical switchboards.
Recent inclining tests showed the vessel met all design calculations and during seatrials the vessel reached a trial speed of 11 knots, allowing a service speed of 10 knots, the company says.