Application of an Alternative Concept in Dynamic Positioning to a Tanker Floating Production System

AuthorsDavison, N.J., Thomas, N.T., Nienhuis, U., Pinkster, J.A.
Conference/JournalOffshore Technology Conference (OTC), Houston, Texas, USA
DateMay 1, 1987
This paper describes the development of a cost-effective floating production system, comprising a conventional tanker fitted with a dynamic positioning (DP) system to maintain the riser connection to the well head.
Reduced costs in the DP system are achieved by using a control strategy based on thrusters at the forward end of the vessel thus allowing the vessel to rotate freely, i.e. weathervane, to the environment. A description of the principles of this control strategy is given.
Application of this DP system to a conventional tanker is briefly outlined. Special attention was required in the location of the thrusters in the forward cargo tank and a description is given of the numerical studies and model tests used to optimise thruster location.In order to gain insight into vessel behaviour under such a DP system, simulation studies were carried out and the results correlated with model tests in a wind, wave and current environment. These results indicated the need for a thruster at the aft end of the vessel under certain environmental conditions.
The paper concludes with an economic assessment of the operational costs of such a DP system, which together with reduced thruster and power plant costs presents an attractive solution to production from marginal fields.

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manoeuvring and nautical studiesstability, seakeeping and ocean engineeringwaves, impacts and hydrostructuralcfd developmentcfd/simulation/desk studiesmeasurements and controldata sciencetime-domain simulationsdynamic positioningrenewablesoil and gasinfrastructuremarine systemslife at seatransport and shippingmodel testingmooring and offloadingmotionssimulationwavesoffshore engineering