Three-Dimensional Nonlinear Vibration Model and Response Characteristics of Deep-Water Riser-Test Pipe System

In this chapter, the 3D vibration control equations of infinitesimal riser-test pipe (RTS) will be established through the energy method and Hamilton variational principle. The infinitesimal segment of the RTS is too short, such that it can be regarded as a straight segment. Because the vibration data of deep-water RTS cannot be accurately measured onsite, a simulation experiment was performed to validate the nonlinear vibration model in this study. Three criteria should be satisfied for the similarity experiment of RTS vibration: geometric similarity, motion similarity, and dynamic similarity. According to the parameters of BY5-2-1 well in the South China Sea and the proposed nonlinear vibration model, the results of marine fluid motion, platform heave motion, and RTS vibration response are obtained, and the vibration characteristics of RTS in deep-water are analyzed.