井眼轨迹控制工具组合轴承力学与疲劳寿命研究

发布时间：2018-05-05 17:31

本文选题：井眼轨迹控制工具 + 组合轴承　；参考：《长江大学》2017年博士论文

【摘要】：井眼轨迹控制工具是一种无级可调新型指向式旋转导向钻井系统,它可灵活并精确地控制井眼轨迹,能够钻出平滑、完整的复杂井眼,具有机械钻速高、位移延伸力强等优点。这就要求井眼轨迹控制工具的组合轴承能够在高温、高压、大偏转角和重载工况下可靠运转。为了精准地控制井眼轨迹,要求工具的组合轴承在承载时具有较小的径向位移和较高的旋转精度。因此,需要深入研究井眼轨迹控制工具组合轴承的力学性能与疲劳寿命。本文以井眼轨迹控制工具为研究对象,系统地分析了井眼轨迹控制工具组合轴承的工作原理,提出了组合轴承的载荷、位移以及疲劳寿命分析方法,为组合轴承的设计、分析提供了理论依据,并在新型井眼轨迹控制工具中得到了很好地应用。本论文的主要研究如下:在考虑工具外壳刚度影响的基础上,以推力调心滚子+调心滚子+推力调心滚子组成的组合轴承为例,分析了推力调心滚子和调心滚子轴承外球面滚道支承工具主轴偏转的工作原理,结合工具主轴偏转角与内外环偏心距之间的关系,建立了组合轴承的超静定静力学平衡方程,结合内部各轴承的位移协调条件,求解出组合轴承内部构件的载荷分布。在超静定静力学平衡方程基础上,考虑井眼轨迹控制工具工作转速,将滚子离心力与陀螺力矩由常规计算中的动载荷设为静载荷,并采用半空间法解决组合轴承静载荷设定中的滚子与滚道Hertz接触与滑动问题,建立了组合轴承的拟静力学平衡方程,主要包括滚子载荷、滚子力矩、滚道载荷和滚道阻力矩等四个方面。考虑工具及组合轴承的具体结构和轴承位移协调条件,建立了组合轴承简化后的有限元分析模型,研究了径向载荷、轴向预紧力、主轴偏转角、转速以及内外环偏心距对组合轴承应力和径向位移的影响;得出组合轴承最大von Mises应力位于左推力调心滚子与滚道在径向载荷方向的接触面上,为362.86MPa。井眼轨迹控制工具工作的环境温度较高,本文就环境温度对组合轴承及轴承滚子与滚道固-固传导关系进行了研究,建立了组合轴承热力耦合分析模型,求解了环境温度分别为50℃、100℃和150℃三种情况下,组合轴承应力及温度场的分布;得出组合轴承的最高温度区域分布在调心滚子轴承在径向载荷方向的接触面上,达到152.7℃,组合轴承最大von Mises应力随着环境温度的升高而增大,分别为415.05MPa(50℃)、509.04MPa(100℃),629.74MPa(150℃),径向位移随着环境温度的升高而减小,分别为5.16μm(50℃)、5.04μm(100℃),4.91μm(150℃)。利用井眼轨迹控制工具和工具的测试控制系统,采用自制的径向位移测量短节,设计了转速、内外环偏转角和偏心距对组合轴承径向位移影响的正交实验方案,完成了216次的混合水平完全正交实验,得出偏心距对组合轴承径向位移的影响最大,与有限元分析结果的趋势完全一致。基于单个轴承的Lundberg-Palamgren疲劳寿命理论和Ioannides-Harris疲劳寿命理论,分别提出了采用概率乘积定理的组合轴承L-P疲劳寿命经验公式,以及结合热力耦合分析结果和实际工况的I-H疲劳寿命计算方法,建立了组合轴承IH疲劳寿命分析模型;通过二种方法与组合轴承寿命试验结果相比较,发现组合轴承I-H疲劳寿命计算方法更符合实际,可用于同类组合轴承的疲劳寿命计算。
[Abstract]:Well trajectory control tool is a new type of stepless adjustable directional rotary steering drilling system. It can control well trajectory flexibly and accurately. It can drill smooth and complete complex boreholes, with high mechanical drilling speed and strong displacement extension force. This requires that the combined bearing of the hole trajectory control tool can be high temperature, high pressure and large deviation. In order to accurately control the wellbore trajectory, the combined bearings of the tool have smaller radial displacement and higher rotation accuracy in order to accurately control the wellbore trajectory. Therefore, it is necessary to study the mechanical properties and fatigue life of the combined bearings for well trajectory control tools. The working principle of combined bearing is analyzed systematically, the load, displacement and fatigue life analysis method of combined bearing are put forward, which provides a theoretical basis for the design of combined bearings, and is well applied in the new hole trajectory control tool. The main research in this paper is as follows: in consideration of the following: On the basis of the influence of the stiffness of the tool shell, the working principle of the spindle deflection of the thrust roller and the adjustable roller bearing and the outer spherical raceway supporting tool is analyzed with the combined bearing of the thrust roller plus the roller and the thrust roller and the thrust roller. The relationship between the deflection angle of the tool spindle and the eccentricity of the inner and outer ring is established. The load distribution of the internal components of the composite bearing is solved by the static statics equilibrium equation of the bearing and the displacement coordination conditions of the internal bearings. On the basis of the statically statically statics equilibrium equation, the working speed of the hole trajectory control tool is considered, and the roller centrifugal force and the torques in the conventional calculation are set as static loads in the conventional calculation. The semi space method is used to solve the contact and sliding problems of roller and raceway Hertz in the static load setting of composite bearings. The quasi static equilibrium equation of the combined bearing is established, which mainly includes four aspects of roller load, roller torque, raceway load and raceway resistance moment. The concrete structure of the tool and the combined bearing and the bearing displacement coordination are considered. The influence of radial load, axial pretension, spindle deflection angle, rotation speed and eccentricity of inner and outer ring on the stress and radial displacement of composite bearings is studied, and the maximum von Mises stress of the combined bearing is located in the radial load direction of the left push roller and the raceway. On the surface, the environment temperature is higher for the 362.86MPa. well trajectory control tool. This paper studies the relationship between the composite bearing and the bearing roller and the raceway, and establishes the thermal coupling analysis model of the combined bearing. The combined bearing stress is solved under the conditions of 50, 100 and 150 degrees centigrade temperature respectively. And the distribution of the temperature field, the maximum temperature region of the composite bearing is distributed on the contact surface of the roller bearing in the direction of radial load. The maximum von Mises stress of the composite bearing increases with the increase of the ambient temperature, which is 415.05MPa (50), 509.04MPa (100), 629.74MPa (150), and the radial displacement is with the ambient temperature. The degree is reduced, which is 5.16 mu m (50 C), 5.04 mu m (100 C) and 4.91 mu m (150 C). Using the test control system of well trajectory control tools and tools, the orthogonal experimental scheme of rotating speed, deflection angle and eccentricity of inner and outer rings on the radial displacement of combined bearing is designed by using the test control system of well trajectory control tools and tools. The orthogonal experiment is designed for 216 times. The effect of eccentricity on the radial displacement of composite bearings is the greatest, which is the same as the trend of the finite element analysis. Based on the Lundberg-Palamgren fatigue life theory of single bearing and the Ioannides-Harris fatigue life theory, the fatigue life of the combined bearing L-P of the combined bearing theorem is proposed. The empirical formula, as well as the I-H fatigue life calculation method which combines the results of thermal coupling analysis and the actual working condition, has established the IH fatigue life analysis model of the composite bearing. By comparing the two methods with the results of the combined bearing life test, it is found that the fatigue life calculation method of the combined bearing I-H is more practical, and can be used for the fatigue of the same kind of composite bearings. Work life calculation.

【学位授予单位】：长江大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TE92

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