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随着海洋油气钻井向深水领域发展，钻井隔水管的受力越来越复杂，随着水深的增加，钻井隔水管的力学分析显得越来越重要。为此，文章建立了深水钻井时在海流、波浪等海洋环境载荷的作用下，隔水管静态分析及动力学分析的三维有限元力学模型，在研究中，考虑了隔水管在外载作用下的小应变大变形和轴向力影响的特点，引入了非线性理论，因而计算结果更加符合实际情况。考虑了隔水管所受的三维载荷，对深水钻井隔水管的变形及载荷分布规律进行了计算分析。对于深水钻井隔水管，水下中间部位的变形最大；而在隔水管靠近水面的位置，其弯曲载荷最大，而现场隔水管失效事故也恰好证实了此研究结果，揭示了深水钻井隔水管失效的力学机理。在弯曲载荷大的位置，应特别注意隔水管的强度问题。文章还分析了风浪流速度、波浪周期、波高等重要的海洋环境载荷对隔水管变形及强度的影响。

STUDY ON DEFORMATION AND LOAD DISTRIBUTION LAW OF MARINE RISER FOR OFFSHORE DEEP DRILLING 1)

With static analysis and dynamics analysis of marine risers, the article develops the 3 D finite element mechanical model under the marine environment loads produced by sea flow and waves during offshore deep drilling. Considering the characteristics of big deformation with small strain under the outside loads and axial force influence for marine risers, and using non linear theory, the calculated results match the real situations better. The calculation and analysis is conducted for the deformation and load distribution law of marine risers for offshore deep drilling considering the 3 D load stood by the marine riser. It is found that the under water middle section of the riser has the biggest deformation, and the riser section near the water surface has the biggest bending load. And real riser failing accidents have also proved the results. The article reveals the dynamic mechanism of riser failing for offshore deep drilling. The strength of the riser at the section with big bending load should paid special attention. The article also analyzes the influence of major marine environment loads, such as sea wave flowing velocity, wave cycle, and wave height etc., on the deformation and the strength of risers.