深井钻探旋转尾管悬挂器轴承密封性能研究

发布时间：2018-12-30 14:54

【摘要】：在超深井、复杂井钻探过程中,旋转尾管固井可以提高固井质量,节约大量成本,保护油气层和自然环境,因此该工艺得到了广泛应用。旋转尾管悬挂器轴承需要在井下高温、高压、泥浆中工作,工况条件十分恶劣,如果轴承密封不严,泥浆及其它杂物进入轴承会加速其磨损。轴承作为重要部件其密封性能的好坏将对旋转尾管悬挂器的顺利使用产生直接影响。为此,本文对旋转尾管悬挂器轴承的密封结构设计及性能进行了分析与研究。论文首先基于旋转尾管悬挂器轴承密封的设计条件,提出了轴承的密封结构、材料选择、安装方式等方案。轴承密封结构中唇形橡胶密封圈的材料性质为超弹性体,结合超弹性体本构非线性理论,分析中考虑了几何非线性、材料非线性和接触非线性。进而确定了表征橡胶材料的参数模型,建立了二维轴对称有限元分析模型,确立了接触类型、边界条件以及加载方式等。其次运用大型非线性有限元软件ABAQUS,研究了预紧状态下,不同初始过盈量对轴承密封圈Von Mises应力以及与挡圈接触面间接触应力的影响;分析了工作压力的变化对轴承密封圈应力、应变的影响。结果表明,不同状态下,轴承密封圈与挡圈接触面间的最大接触应力始终大于工作压力,保证了旋转尾管悬挂器轴承的密封性。然后采用顺序耦合热应力方法,分析了温度载荷、不同初始过盈量对轴承密封圈Von Mises应力和接触应力的变化影响;结果表明,温度变化并不影响轴承密封圈密封性能要求。最后分析了橡胶密封圈的主要失效形式及影响因素,将摩擦系数作为重点考虑因素进行了分析。为提高旋转尾管悬挂器轴承密封的使用寿命提供一定的参考。本文采用非线性有限元法对轴承唇形橡胶密封圈进行了仿真分析,减少了实验成本、缩短研发周期,为旋转尾管悬挂器轴承密封结构的设计优化以及密封性能研究奠定了基础。
[Abstract]:In the drilling process of ultra-deep and complex wells, the rotary tail tube consolidation well can improve cementing quality, save a lot of cost, protect oil and gas reservoir and natural environment, so this technology has been widely used. The rotary tail tube suspension bearing needs to work in the underground high temperature, high pressure and mud, the working condition is very bad, if the bearing seal is not strict, the mud and other sundries entering the bearing will accelerate its wear and tear. As an important component, the sealing performance of bearings will have a direct impact on the smooth use of rotary tail tube suspenders. In this paper, the seal structure design and performance of rotary tail-tube suspension bearings are analyzed and studied. Firstly, based on the design conditions of the bearing seal of the rotary tail tube suspension, the sealing structure, material selection and installation method of the bearing are put forward. The material properties of the lip rubber seal ring in the seal structure of bearing are super elastomer. Combined with the constitutive nonlinear theory of super elastomer, geometric nonlinearity, material nonlinearity and contact nonlinearity are considered in the analysis. Then the parameter model of rubber material was determined, the two-dimensional axisymmetric finite element analysis model was established, and the contact type, boundary condition and loading mode were established. Secondly, the influence of different initial interference on the Von Mises stress of bearing seal ring and the contact stress between the contact surface of bearing seal ring and the ring is studied by using the large-scale nonlinear finite element software ABAQUS,. The influence of the working pressure on the stress and strain of the bearing seal ring is analyzed. The results show that the maximum contact stress between the bearing seal ring and the baffle contact surface is always greater than the working pressure in different states, which ensures the sealing performance of the rotary tail tube suspension bearing. Then, the influence of temperature load and initial interference on the Von Mises stress and contact stress of bearing seal ring is analyzed by using sequential coupled thermal stress method, and the results show that the temperature change does not affect the sealing performance of bearing seal ring. Finally, the main failure forms and influencing factors of rubber sealing ring are analyzed, and the friction coefficient is considered as the key factor. It provides a certain reference for improving the service life of the bearing seal of the rotary tail tube suspension. In this paper, the nonlinear finite element method is used to simulate and analyze the bearing lip rubber seal ring, which reduces the experimental cost and shortens the research and development period. It lays a foundation for the design optimization of the bearing seal structure and the study of the sealing performance of the rotary tail tube suspension bearing.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE927

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