Abstract: Marine risers system is one of the major equipments for offshore drilling.Simplifying the four-order nonlinear partial differential equation and boundary conditions for describing marine risers motion,a nonlinear dynamic analysis is numerically simulated by using a finite-difference method.The top tension on the marine risers is studied,using four seastates which correspond to increasingly severe drilling modes:normal drlling condition,limited drilling condition #1,limited drilling condition #2,and suspended drilling condition.The calculation program has been completed.Numerical results are compared with those obtained by STRESS ENGINEERING SERVICES INC.U.S.A.,there is no difference.It is shown that the dynamic analysis method and computing program in this paper are simple,accurate and time-saving.It is applicable to the design and check of the marine riser system.

Key words: offshore drillling, riser, numerical simulation, dynamic analysis

摘要： 隔水管系统是海洋钻井的主要设备之一:本文对描述隔水管运动的四阶非线性偏微分方程和边界条件进行了简化,并应用有限差分法对隔水管的受力情况进行数值分析,对作用在隔水管上的顶张力,使用四种情况进行研究,并编制了相应的计算程序,实例计算与美国应力工程服务公司的计算结果完全一致,所提供的动态分析方法及计算程序具有方法简便、精确度高和机时省等优点,对设计和校核隔水管系统具有实际的运用价值.

关键词: 海上钻进, 隔水管, 数值模拟, 动力分析