力法在多封隔器管柱轴向力分析中的应用  

Application of Force Method to Axial Force Analysis of Multi-packer Tubing

作　　者：李明飞[1] 窦益华[1] 曹银萍[1] 李浩[1] LI Mingfei;DOU Yihua;CAO Yinping;LI Hao(College of Mechanical Engineering,Xi'an Shiyou University,Xi'an 710065)

机构地区：[1]西安石油大学机械工程学院

出　　处：《西安石油大学学报（自然科学版）》2020年第1期89-96,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省自然科学基金(2019JM-473);国家自然科学基金项目(51674199)

摘　　要：坐封后,多封隔器管柱为超静定结构,常规单封隔器管柱轴向力的求解方法不适用于该结构。鉴于此,以直井多封隔器管柱为研究对象,基于力法和杆件变形理论,建立了多封隔器管柱超静定结构轴向力的计算模型,推导出轴向力的表达式。以四封隔器管柱为例,考虑压裂工况,分析了温度效应和鼓胀效应下四封隔器间3段管柱的轴向力,对比了文中方法与传统计算方法的结果。研究表明:两种算法计算的差值与温度和压力及其变化量无关,而与封隔器间管柱段的长度有关;两者差值随井深的增加而增加;某段管柱长度的变化对上部管柱段的差值没有影响,而使下部管柱段的差值变化。与传统计算公式逐段计算管柱受力不同,该方法可同时计算封隔器间每段管柱的轴向力,结果更加精确。The multi-packer tubing is a indeterminate structure,and the conventional method for calculating the axial force of single packer tubing is not suitable for this structure.In view of this,based on the force method and the rod deformation theory,the calculation model of the axial force of the indeterminate structure of the multi-packer tubing is established,and the expression of the axial force is derived.Taking the four-packer tubing as an example,considering the fracturing conditions,the axial forces of three segments of the four-packer tubing under the temperature effect and ballooning effect are analyzed,and the axial forces calculated by this method and the traditional method are compared.The result shows that the difference of axial forces calculated by the two methods has nothing to do with temperature and pressure and their variation,but with the length of the tubing between two packers;it increases with the increase of well depth;of three segments of tubing,the change of the length of a certain segment will not affect the calculation difference of the axial force of the segment above it,but will affect that of the axial force of the segment below it.Different from the traditional calculation method to piecewisely calculate the axial force of the tubing,this method can calculate the axial force of each section of tubing between packers at the same time,and the result is more accurate.

关 键 词：管柱 力法 超静定结构 封隔器 轴向力 

分 类 号：TE931[石油与天然气工程—石油机械设备]