9000kN深水钻机井架设计与试验

Design and Research of 9 000 kN Deepwater Drilling Rig Derrick

深水钻机井架在作业过程中不仅要承受环境载荷和操作载荷,还要承受由于平台运动而产生的动力载荷。在分析9 000 kN深水钻机井架设计要求的基础上,确定了井架的主要技术参数和结构方案,即选择单斜瓶颈式塔形结构,有效高度64 m;同时应用有限元分析软件SACS对井架进行了计算分析,并依据相似原理设计了井架的缩放模型,对模型井架进行了动态载荷和最大钩载荷联合加载。分析结果表明:井架在操作工况和风暴工况下的最大UC值分别为0.984和0.933,满足API Spec 4F规范;模型井架的最大Von Mises应力为126.12 MPa,结构的安全系数为1.67,验证了有限元计算的正确性。所得结论为我国的海洋井架设计提供了参考。

The deepwater drilling rig derrick must withstand not only environmental loads and operating loads,but also the dynamic loads caused by the platform movement. Based on the analysis of design requirements for the 9000 kN deepwater drilling rig derrick,the main technical parameters and structure of the derrick have been determined,that is monoclinic bottleneck style tower structure with the effective height of 64 m. The designed derrick has been analyzed using the finite element analysis software SACS. A derrick scaling model has been designed based on similar principles, and has been loaded with the combination of the dynamic load and the maximum hook load. The results showed that the maximum UC value of the derrick under operating condition and storm condition were 0. 984 and 0. 933,meeting the requirement of API Spec 4F. The derrick model has a maximum Von Mises stress of 126. 12 MPa and structural safety factor of 1. 67,proving the correction of finite element calculation. The study conclusion could provide references for our nation＇ s offshore derrick design.