芯轴悬挂器高强度螺纹结构设计及评价研究  

Structural Design and Evaluation of High Strength Thread of Mandrel Hanger

作　　者：刘洋[1,2] 佘扬周[1] 练章华 易先中[1] LIU Yang;SHE Yangzhou;LIAN Zhanghua;YI Xianzhong(School of Mechanical Engineering,Yangtze University,Jingzhou,Hubei 434023,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]长江大学机械工程学院,湖北荆州434023 [2]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2024年第3期159-169,共11页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金(51974035,51974271);湖北省重点研发计划(2020BAB055)。

摘　　要：为了防止芯轴下端连接螺纹强度不足而造成失效事故,采用高温高压套管柱设计计算方法、有限元数值模拟和实验手段,对芯轴材料进行了力学性能实验,开发了一种用于芯轴悬挂器高强度螺纹结构,并在极限复合载荷下对该螺纹进行了三维有限元计算。研究结果表明,拉扭压复合载荷对外螺纹强度影响较大,压缩载荷对内螺纹内台肩第一牙应力影响较大,内外螺纹其余部位相对安全。拉伸载荷在一定程度缓解了上扣扭矩对内外螺纹台肩部位的影响。从计算结果得到内外螺纹整体上应力小于材料允许的屈服极限,且螺纹接头接触压力均大于外在流体压力,可以形成有效密封,研究结果为芯轴悬挂器螺纹结构的选型和使用提供理论基础。In order to prevent failure accident caused by the insufficient strength of the connecting thread at the lower end of the mandrel,the mechanical property experiment of the mandrel material is carried out by using the design and calculation method of high temperature and high pressure of casing string,finite element numerical simulation and experimental means,and a high-strength thread structure for the mandrel hanger is developed,and the finite element calculation of three-dimensional of the thread is carried out under the ultimate composite load.The compression load has a great influence on the stress of the first tooth of the internal shoulder of the internal thread,and the rest of the internal and external thread is relatively safe.The tensile load alleviates the influence of makeup torque on the shoulder of internal and external threads to a certain extent.From the calculation results,it is concluded that the overall stress of the internal and external threads is less than the allowable yield limit of the material,and the contact pressure of the threaded joint is greater than the external fluid pressure,which can form an effective seal.The research results provide a theoretical basis for the selection and use of the threaded structure of the mandrel hanger.

关 键 词：芯轴 螺纹 高强度 复合载荷 有限元 

分 类 号：TE921[石油与天然气工程—石油机械设备] TH131.3[机械工程—机械制造及自动化]