Modeling and simulation of deepwater pipeline S-lay with coupled dynamic positioning

Ai, Shangmao and Sun, Liping and Tao, Longbin and Yim, Solomon C. (2018) Modeling and simulation of deepwater pipeline S-lay with coupled dynamic positioning. Journal of Offshore Mechanics and Arctic Engineering, 140 (5). 051704. ISSN 0892-7219

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Dynamic position (DP) control and pipeline dynamics are the two main parts of the deepwater S-lay simulation model. In this study, a fully coupled analysis tool for deepwater S-lay deployment by dynamically positioned vessels is developed. The method integrates the major aspects related to numerical simulation, including coupled pipeline motion and roller contact forces. The roller–pipe interaction is incorporated in the S-lay pipeline model using a contact search method based on a lumped-mass (LM) formulation in global coordinates. A proportional-integration-differentiation (PID) controller and a Kalman filter are applied in the vessel motion equation to calculate the thrust allocation of the DP system in time domain. Numerical simulation results showed that the dynamic effects add a significant contribution to the tension, but have little influence on the maximum pipe stress and strain. The dynamic response of the coupled S-lay and DP pipeline deployment system increases the demand on the tensioner load carrying capability as well as the maximum DP thruster power.