Analysis of Coupling Characteristics of the Offloading Buoy System in West Africa Seas
- Ning He (China Offshore Oil Engineering Co. (COOEC)) | Cheng Zhang (Harbin Engineering University) | Zhuang Kang (Harbin Engineering University)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- offloading buoy system, West Africa seas, numerical simulation, coupling characteristics, model test
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- 15 since 2007
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The deepwater offloading system mainly composed of oil offloading line (OOL), mooring system and a catenary anchor leg mooring (CALM) buoy is widely used in the offshore oil and gas field development in West Africa and other sea areas. The coupling dynamics of the system must be taken into account in the motion investigation of the CALM buoy. In this paper, the internal relationship between the motion of the CALM buoy and the wave load in West Africa seas is analyzed, and the coupling characteristics between the buoy and the mooring system and OOL are studied. Based on the radiation/diffraction theory, the numerical model for coupled analysis of the offloading buoy system including the hydrodynamic models of the buoy and the OOL as well as the mooring system is established. On this basis, the coupling model test of offloading buoy system is conducted to check the numerical model. By combining the model test and numerical simulation, the motion response and dynamics of the whole system in the combined condition of swell and wind wave of West Africa seas are discussed, which can provide a reference for the design of deepwater offloading buoy system and give the technical support for deepwater oil and gas development projects, especially in West Africa seas.
West Africa Sea has become one of the most concentrated areas of deepwater oil and gas exploration and development as well as investment in the world for the abundant oil and gas resources. In recent years, the developing mode of “Multi-point moored FPSO + Offloading buoy system + Shuttle tanker”, shown in Fig. 1, has been widely used for deepwater oil and gas exploration in offshore West Africa (Kang et al., 2017). The offloading buoy system mainly involving the CALM buoy, mooring system and oil offloading lines can not only be used for the storage and transportation of oil and gas, but also serve as a single point mooring device for shuttle tankers, and it can effectively reduce the probability of collision between shuttle tankers and FPSO (Vinnem et al. 2015).
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