Abstract
As a competitive alternative to the conventional dry tree and wet tree concepts, the next generation subsea production system, with a focus on the critical issues of well access and riser design, is designed to utilize shallow-water rated subsea production systems for the development of large oil and gas fields in deep and ultra-deep water. This study focuses on the crucial component of the next generation subsea production system, referred to as the submerged production platform-mooring system, and investigates its nonlinear coupled dynamic responses to internal solitary waves. A time-domain coupled dynamic analysis method is developed. Specifically, based on the load experiment in a large gravitationally stratified fluid flume, the applicability conditions of internal solitary wave theories and the determination method of hydrodynamic coefficients are quantitatively characterized, and the internal solitary wave load model for the submerged production platform is developed and validated. The fully coupled dynamic analysis model for the submerged production platform-mooring system is established and solved by the Generalized-α integration algorithm in combination with the Newton iterative method. The coupling effects, dynamic response characteristics, and security weaknesses of the submerged production platform-mooring system are analyzed. The effects of various key factors on the dynamic responses of the submerged production platform-mooring system are systematically analyzed. The results demonstrate that the dynamic responses of the submerged production platform-mooring system to internal solitary waves are characterized by the large amplitude surge and heave motions, and the significant fluctuation in the mooring tension, particularly when the submerged production platform is located at the density pycnocline. The developed method also has its applicability to the dynamic analysis of the deepwater free standing hybrid riser system in internal solitary waves.
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