Abstract
With the wide application of cylindrical FPSO (Floating Production Storage and Offloading, FPSO), more and more people pay attention to its operational safety. To study and explore the safety of cylindrical FPSO offloading operation under extreme weather, it is necessary to conduct the simulation of whole operation process in such conditions. At first, the programming models are formulated for the cylindrical FPSO, shuttle tanker and tugs; then, based on the modelling, the responses of the cylindrical FPSO are simulated during offloading operation under various conditions, combined with Delphin Method and relevant theory. The most unfavorable load state and ultimate wind speed on unfavorable wind direction are explored through three stages: 1. changing the loading status of shuttle tanker and cylindrical FPSO; 2. changing the relative bearing of wind; 3. changing the wind speed. The results showed that when the offloading state is FPSO half-load & tanker half-load, it is the worst state to control the offloading system and the limit wind speed in the simulation is: cross wind ≤20 knots.By analyzing the motion response of cylindrical FPSO which is assisted by two tugs, a relatively objective and reasonable solution is obtained, which provides a beneficial reference for the future cylindrical FPSO offloading operation under the extreme weather conditions.
Highlights
In recent years, with the development of offshore oil mining technology, many new types of floating offshore platform have been invented
Based on the cylindrical FPSO to be installed in an oil field in South China Sea, this paper explores the marginal conditions upon offloading operation by simulation experiment of the response of cylindrical FPSO with the assistance of two tugs, evaluates the safety and operability of the cylindrical FPSO’s offloading operation programme, provides theoretical basis for further guiding the practical offloading operation and avoid the risk in the future
Where, is the longitudinal component of the resultant force acting on the shuttle tanker exerted by the mooring hawser and the towing hawsers; and are the longitudinal and transverse forces exerted by the mooring hawser acting on the shuttle tanker; and are the longitudinal and transverse forces exerted by the towing hawsers acting on the shuttle tanker; is the rotational moment acting on shuttle tanker on the horizontal plane; and are the distances between the acting points of force exerted by the mooring hawser and the towing hawsers on the shuttle tanker and the middle point of the ship respectively
Summary
With the development of offshore oil mining technology, many new types of floating offshore platform have been invented. Marcos Cueva and Fernando Faria study the hydrodynamic response of heave and pitch motion of cylindrical FPSO in conjunction with the model test and numerical simulation under the various waves action [7]. With the model test methods, Ma analyzes its hydrodynamic characteristics under the irregular waves and rogue waves action and studies the motion response of FPSO and influence factors of the mooring force [10]. In order to reduce the hydrodynamic response of cylindrical FPSO, Ji et al construct the numerical model of cylindrical FPSO with various taper of anti-motion structure based on fluid dynamics computational method, obtain the damping coefficient through the model calculation, and propose a new type of cone angle vibration resistant structure [11].
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