Dynamic model and application analysis of flow field interference between marine risers based on improved shielding effect model

Abstract

With the development of petroleum production engineering towards the deep sea, the collision of adjacent risers in the riser array has become a problem of great concern. In order to better reflect the motion characteristics of the riser array system under the influence of ocean currents and wake effects, and to facilitate the research on active collision prevention control, this paper improves the Blevins wake effect model. And on this basis, a two-dimensional riser array system model is established by comprehensively considering internal flow, coupling between floater and the riser, lift force and other factors. Based on the above model, the transient solution of the system is carried out. The vibration analysis and collision analysis are carried out from the perspective of time domain and frequency domain. Moreover, the influence of the initial spacing between the risers, the top tension, and the natural frequency of the risers on the vibration and collision of the system is also studied in this paper.