Riser lateral displacement, bending moment, and deflection of the deep water well considering actual riser string configuration in South China Sea are simulated.
The distribution of riser lateral displacement, bending moment, and deflection significantly increases with the increase in surface current speed and large current speed may lead to large lateral displacement, bending moment, and deflection.
The effects of top tension, drilling platform drift distance, surface current speed, wave height, wave period, wave length, wind speed and damping coefficient on riser lateral displacement, bending moment, and deflection are also discussed.
The distribution of riser lateral displacement, bending moment, and deflection increases with the increase in surface current speed and drilling platform drift distance, whereas decreases with the increasing top tension and damping coefficient.
Based on this, the influences of water depth, floating vessel top displacement, riser wall thickness and structure damping coefficient on the optimal top tension are discussed.
The riser responds by displacements and stresses both in and out of the plane of excitation due to direct loading and vortex shedding effects respectively.
Our numerical results show that the dynamic response displacement of riser becomes several times larger than the displacement for the case without top-end motion.
Analysis results show that, for a given status, there is an optimal top tension making the deflection angle variance be minimum, and the optimal top tension increase with water depth, floating vessel top displacement and riser wall thickness.
While the minimum value of the variance increase with water depth and the floating vessel top displacement, and decrease with riser wall thickness.
The riser is a near ideal plug-flow displacement of the catalyst and reaction mixture, while the main reactor vessel (separator) is considered as an ideal mixing CSTR.
