半潜式钻井平台锚泊定位锚链张力优化

Research on Optimization of Chain Tension for Mooring Anchor for Semi-submersible Platform

摘要:

半潜式平台长期在海洋上生产作业时,为了防止其在外界环境风、浪、流的干扰下发生漂移,通过锚泊定位控制平台使其始终在安全范围内工作;当锚泊系统平台某角某一根或多根锚链张力过大或过小时,就会造成锚链因疲劳而断裂及能量的浪费;为充分发挥所有锚链的能力,使各锚链张力值尽量接近,对锚泊定位锚链张力进行研究;在遗传算法的基础上结合非线性规划算法进行锚链张力优化,结合两种算法的优点让优化结果具有更高的精度;最后,应用所建立的数学模型在Matlab/Simulink仿真环境下对981钻井平台进行仿真试验,仿真结果表明能在满足锚链张力均衡分布的情况下充分满足平台的作业要求,保证海洋平台工作的安全性。

Abstract:

The semi-submersible platform works in severe sea condition through the anchor mooring positioning, in order to prevent the platform in the external environment to drift under the interference of wind, wave and flow, this paper research on anchoring positioning chain tension. The genetic algorithm combined with nonlinear programming algorithm which can improve the optimization efficiency was adopted to optimize the tension, avoid the tension too large or too small which in platform of a corner, resulting in the chain due to fatigue fracture and energy waste. Simulation results of 981drilling rig was carried out on both in the standby condition and in operation condition, and the simulation in Matlab/Simulink results show that the scheme is effective to balance the distribution of tensions and keep the position of offshore platform.