关键词: 海上钻进, 隔水管, 数值模拟, 动力分析

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