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增加油气产量的悬链式钢制柔性隔水管(SCR)系统的使用使钻井向远海和深水发展。海底对隔水管周期性干扰导致的疲劳损伤问题制约了SCR系统的推广使用和延伸范围。这个问题包括海沟结构、非线性土壤硬度、海底隔水管的破裂以及周期性载荷期间土壤阻力的降低在内的一系列复杂因素。本文提出的土壤干扰模型能够模拟这些复杂性,使用输入的参数能够得到一些合理的结果。模型对典型的海洋松软土壤条件的模拟说明这些模型能够真实地预测周期性的弯矩。土壤阻力的降低对周期性的弯矩起主要作用,特别是对隔水管着陆点(TDP)的提升运动的影响最大。
The use of a catenary flexible steel riser (SCR) system to increase oil and gas production has enabled drilling to develop into deep sea and deep water. The problem of fatigue damage caused by the periodic interference of the seabed on the riser restricts the popularization and extension of the SCR system. This problem includes a series of complex factors, including trench structure, nonlinear soil hardness, rupture of subsea risers, and reduction of soil resistance during cyclic loading. The soil disturbance model proposed in this paper can simulate these complexities and use the input parameters to get some reasonable results. Simulation of typical marine soft soil conditions in these models shows that these models can truly predict periodic bending moments. The reduction of soil resistance plays a major role in the cyclic bending moment, especially the lifting movement of riser landing point (TDP).