Abstract: Subsea well mouth system is an essential equipment for deep⁃sea oil and gas drilling and production. Conventional casing hanger and sealing assembly running tools cannot meet the actual needs. The mechanical model of running tool for casing hanger and sealing assembly was established, which can directly describe the force on the running tool. According to the mechanical model and analysis results, the structure of running tool could be well designed. The contact and strength analysis on casing hanger carrying and driving unit of running tool were conducted using ANSYS finite element analysis software. The analysis results show that the maximum stress values of key components, such as locking block, retaining ring and mandrel of casing hanger, are less than the yield strength of material, which deformation is small enough to be ignored. The structure of the running tool meets the design requirements, and the material used selection also meets the operation standards. This work can provide design experience for the running tool of casing hanger and sealing assembly.

Key words: Subsea wellhead, Casing hanger, Sealing assembly, Running tool, Structural design, ANSYS

摘要： 水下井口头系统是深海油气钻采必不可少的设备，常规套管挂和密封总成下放工具不能满足现场需要。建立了套管挂和密封总成下放工具力学模型，采用该模型可以直观地描述下放工具受力情况，根据力学模型和分析结果对下放工具进行结构设计。利用ANSYS有限元分析软件对下放工具套管挂携带单元和驱动单元进行接触分析和强度分析。分析结果显示，套管挂携带锁块、挡环和芯轴等关键部件最大应力值小于材料屈服强度，其变形量很小亦可忽略；该下放工具结构满足设计要求，材料选择符合作业标准，可为套管挂和密封总成下放工具的研究提供设计经验。

关键词: 水下井口头, 套管挂, 密封总成, 下放工具, 结构设计, ANSYS