新型干树式半潜平台浮体结构设计研究

Structural design study of a new type of semi-submersible platform for dry-tree application

为适应中国南海深水区域的油气田开发,研发出了一种具有渐变式立柱的深吃水干树式半潜钻井/生产平台(TCDDSemi)。平台的浮体采用了深吃水、变截面长立柱构型,即向底部逐渐扩大的渐变截面形式。结合干树式深吃水半潜平台的研发过程,通过采用压缩空气压载系统、全注水下浮体、压缩空气水密检测以及水密面板的三级正交加强筋设计等新兴技术,极大地提高了钢材的利用效率,达到了节省材料、减轻浮体自重的目的。对浮体的有限元(FEM)整体分析结果表明,浮体结构设计满足各工况强度要求。

Aimed to be used as a host facility for a gas project in deep water area in the South China Sea,a tapered column deep draft semi-submersible(TCDD-Semi)concept has been successfully developed for dry tree drilling and production application.The hull of the platform adopts a deep water,long varying cross-section column configuration,i.e.,the lower columns gradually enlarge to the keel level.Based on the research and development process of the TCDD-Semi,this paper focuses on the innovative application of air-over-water(A.O.W)ballast system,permanently flooded pontoons,compressed air tightness test,and the three-class orthogonally stiffened panel design of the watertight bulkheads to improve the efficiency of the steel material,and thus to save material and reduce the self-weight of the hull.The global analysis on the hull structure by FEM shows the resulting structure possesses adequate strength for all the considered conditions.