Subsea Well Intervention Vessel and Systems

Abstract With the present deepwater developments on the increase it is foreseen that adedicated market will develop for vessels capable of intervening on subseawells at a lesser cost than existing deepwater drilling units. Thereby (I)extend the life of deepwater developments rendering additional profits and (II)adhere to minimum field production requirements as are being required by theauthorities more and more to date. The paper describes the development of the concept for such a Well InterventionVessel resulting from a combined effort between a Naval Architecture DesignBureau and a major rig equipment supplier with a focus on an open equipmentstructure facilitating the possible application of multiple levels of/andintervention solutions. The vessel will target Class B+/(II+) and Class C/(III)type interventions, based upon systems which will use risers and capable ofretrieving completions. Input of operators as well as equipment- and serviceproviders has been used in the development of the concept to develop the opensystem. The proposed paper shall present in detail the design approach and basis, theconcept design and the operational parameters of the deepwater well completionand intervention vessel. It will also address in detail the specific pieces ofequipment to be used on the vessel.