高温高压井完井封隔器锁紧机构力学分析及有限元模拟  

Mechanical analysis and finite element simulation of well completion packer locking mechanism in HT/HP wells

作　　者：秦彦斌[1] 王鹏[1] 窦益华[1] QIN Yanbin;WANG Pen;DOU Yihua(College of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065 China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065

出　　处：《机械设计与制造工程》2018年第3期51-55,共5页Machine Design and Manufacturing Engineering

基　　金：国家科技重大专项(2016ZX05051-19);西安石油大学研究生创新与实践能力培养项目(YCS16212061)

摘　　要：针对高温高压井完井封隔器锁紧机构失效而引起的中心管损伤及断裂等问题,以7英寸MHR完井封隔器为研究对象,运用莫尔定理推导出锁紧环压缩量计算公式,得到锁紧环压缩量的影响参数为锁紧环楔形角及锁紧环开口角度;利用静力学理论建立MHR完井封隔器锁紧环和中心管的接触应力方程及锁紧环受剪切应力方程;分别改变锁紧环楔形角、锁紧环开口角度、锁紧环齿宽及锁紧机构所受轴向压力,运用ANSYS Workbench模拟了MHR完井封隔器锁紧机构的力学性能。结果表明:锁紧环受力不均且主要工作部位为锁紧环前端螺纹,楔形角是影响锁紧环压缩量的主要因素,楔形角越大锁紧环压缩量越小;锁紧环与中心管最大应力均随轴向压力的增大而增大,锁紧环的最大应力与齿宽成正比,而中心管最大应力与齿宽成反比。该研究可为封隔器锁紧机构的设计、优化提供参考依据。To solve the central tube is damaged or the center tube is broken caused by the failure of the packer locking mechanism,taking the 7-inch MHR packer as the research object,the deformation formula of the locking ring is deduced by using the Moore theorem,the influence of the locking ring deformation parameters are the wedge angle of the locking ring and the opening angle of the locking ring.The contact stress equation of the MHR packer locking ring and the center tube and the shear stress equation of the locking ring are established by using the static theory.To change the wedge angle of the locking ring,the opening angle of the locking ring,the locking ring width and the axial pressure of the locking mechanism respectively,the mechanical properties of the MHR packer locking mechanism were simulated by ANSYS Workbench.The results show that the locking ring is unevenly stressed when working and the main working parts are front thread,the wedge angle is the main factor affecting the deformation of the locking ring.The larger the wedge angle is,the smaller the deformation of the locking ring is.The maximum stress of the locking ring and the central tube increases with the increase of the axial pressure.The maximum stress of the ring is proportional to the tooth width,and the central tube is inversely proportional to the tooth width.The study can provide a reference for the design and optimization of the packer locking mechanism.

关 键 词：封隔器 锁紧机构 力学分析 有限元分析 

分 类 号：TE931[石油与天然气工程—石油机械设备]