Abstract
Due to the complexity of riser dynamic behavior in various sea conditions, the reentry of the deepwater drilling riser to the seabed wellhead is difficult to perform. To facilitate reentry operation, Ant Colony Optimization (ACO) algorithm is adopted to optimize the movement of the riser upper end. Under optimized movement, the distance between the riser lower end and the seabed wellhead is shortened, and the oscillation of the riser lower end is damped quickly. To test the efficiency of reentry motion optimization, the water-tank experiments are carried out. The experimental results show the good efficiency of the movement optimization. For a 1500m riser in deepwater drilling, the numerical simulations of ordinary and optimized reentry motions are shown also.
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