压缩式密封胶筒密封性能及可靠性设计研究

发布时间：2018-05-31 06:32

本文选题：封隔器 + 压缩式密封胶筒　；参考：《天津科技大学》2017年硕士论文

【摘要】：压缩式密封胶筒是封隔器的关键部件,胶筒的密封性能直接影响封隔器在井下对油层的分层效果及油井的开采效率。本文根据压缩式封隔器密封胶筒的结构和工作特点,研究了压缩式密封胶筒的密封机理和失效机理。分析封隔器在初封阶段和工作阶段胶筒的密封原理,及其对应的自由变形、约束变形和稳定变形三种变形状况下的工作特性。通过建立胶筒密封性能数值分析模型,应用压力法分析了胶筒在自由变形、约束变形和稳定变形阶段的材料、几何和应力变化等非线性关系,得出胶筒密封性能的数值计算模型,并确立了封隔器胶筒密封性能判别准则。通过建立了压缩式封隔器胶筒密封的非线性有限元模型,从其材料非线性、几何结构的非线性和胶筒接触力学的非线性特点,综合应用于胶筒密封性能分析中,模拟分析胶筒在密封过程中变形、应力的分布特点,并与数值分析模型进行对比。应用有限元分析模型分析了复杂结构、载荷多变的密封胶筒的密封性能分析,应用该分析模型分析胶筒结构设计端面尺寸结构、支撑环结构、隔环设计等因素对胶筒密封性能的影响分析。从影响胶筒密封性能的结构设计和材料设计角度,通过分析胶筒应力集中的数值计算模型,结合结构可靠性概率分析法的四阶矩技术,分析胶筒结构参数、材料参数以及载荷在非正态分布随机不确定性变化影响下胶筒密封性能的可靠性及灵敏度分析计算。分析得出影响胶筒密封可靠性的主要影响参数及参数变化的灵敏度分析,该分析方法可作为工程应用中胶筒的可靠性评估指标及结构参数设计的依据,为压缩式封隔器胶筒的结构设计提供理论依据和方法指导,对提高封隔器胶筒的密封性能和可靠性具有重要的意义。
[Abstract]:Compression seal cylinder is the key component of Packer. The sealing performance of the Packer directly affects the oil layer stratification effect and the production efficiency of oil well. According to the structure and working characteristics of compressed Packer, the sealing mechanism and failure mechanism of compressed Packer are studied in this paper. This paper analyzes the sealing principle of the Packer in the initial sealing stage and the working stage, and the working characteristics of the Packer under three kinds of deformation conditions: free deformation, constrained deformation and stable deformation. By establishing a numerical analysis model of cylinder seal performance, the nonlinear relationships of materials, geometry and stress changes in free deformation, confined deformation and stable deformation are analyzed by means of pressure method. The numerical calculation model of the seal performance of rubber cylinder is obtained, and the criterion of the seal performance of the Packer cylinder is established. The nonlinear finite element model of rubber cylinder seal of compression Packer is established. According to the nonlinear characteristics of material, geometric structure and contact mechanics, the model is applied to the performance analysis of rubber cylinder seal. The characteristics of deformation and stress distribution in the sealing process are simulated and compared with the numerical analysis model. Finite element analysis model is used to analyze the sealing performance of the sealant cylinder with complex structure and variable load. The end face dimension structure and supporting ring structure of the cylinder structure are analyzed by using the model. The influence of the ring design on the seal performance of rubber cylinder is analyzed. From the point of view of structural design and material design which affect the sealing performance of rubber cylinder, the structural parameters of rubber tube are analyzed by analyzing the numerical model of stress concentration and combining with the four-order moment technique of probability analysis of structural reliability. The reliability and sensitivity of the sealing performance of rubber cylinder are calculated under the influence of material parameters and loads under the influence of random uncertainty of non-normal distribution. The sensitivity analysis of the main parameters affecting the reliability of rubber cylinder seal and the variation of the parameters are obtained. The analytical method can be used as the basis for the reliability evaluation index and structural parameter design of the rubber tube in engineering application. It provides the theoretical basis and method guidance for the structure design of the compression Packer rubber cylinder. It is of great significance to improve the sealing performance and reliability of the Packer rubber cylinder.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2

【参考文献】