The Riser Axial Dynamic Response Control Of FDPSO-TLD

In order to satisfy the requirements of deep-sea oil and gas resources exploitation, offshore production systems also will continue to develop and update. FDPSO is a new marine exploitation equipment, which is based on the concept of FPSO transformation and development. The basic idea is to add drilling equipment on the FPSO, it has oil field drilling, oil production, reserves, maintenance, transmission and other functions. Along with the deepening of development depth, the installation, maintenance and control of the sub sea tree are also more difficult. Therefore, FDPSO use of dry production tree, about to production tree placed on the sea drilling platform. Generally dry production tree match the top tension risers. The relative movement of the riser and the platform has certain requirements, in particular the vertical movement. In order to make FDPSO can adopt dry production tree and control the impact of its heave motion on the risers, proposed TLD (Tension Leg Deck) heave compensation device. However, by the FDPSO-TLD movement analysis found that the dynamic response of the riser is still very significant. According to the theory of fluid mechanics and vibration mechanics, the article based on the actual working environment of offshore production system, and established the equations of motion of the hull and axial vibration differential equations of risers. By adopting the method of LQG control method to establish mathematical model of the controlled system and construct the LQG controller. Kalman filter is selected as the observer on the dynamic response of the riser axis active control. Application of MATLAB programming, By adjusting the parameters μ of the weighting matrix Q to achieve heave compensation control of risers, thereby reduce the dynamic response of riser axial caused by heave motion of the hull, and improve the working life of the riser.