螺杆钻具的流固耦合计算和模态分析

发布时间：2018-08-20 15:43

【摘要】：石油作为工业发展的血液,不仅是动力燃料的来源,其提炼物更是深入到我们生活的方方面面。随着开采深度的加深,钻井难度的加大,要求螺杆钻具性能更高,螺杆钻具设计的好坏影响着钻探工作的效率及水平。因此螺杆钻具投入钻井工作前,需要进行性能参数检测,一般是在螺杆钻具试验台上进行的。本文采用的螺杆钻具及其试验台来源于企业,采用有限元分析软件ANSYS作为分析平台,在已有分析实例的基础上,对螺杆钻具进行流固耦合计算和模态分析。本文主要从两方面研究螺杆钻具。第一是通过分析螺杆钻具的结构特点和工作原理,根据线型特点建立离散点并通过MATLAB曲线拟合生成螺杆马达的线型,构建了螺杆马达的有限元模型,利用ANSYS对螺杆马达进行了静力分析和流固耦合计算,得到了高压钻井液的压力分布和速度分布规律,通过分析对螺杆马达定子进行优化。第二是对螺杆马达定子进行模态分析,构建试验台机架有限元模型并进行模态分析,计算试验台其他设备的固有频率,将螺杆马达的固有频率与其他外激励源的频率进行对比,对螺杆马达转子进行优化。通过以上两方面对螺杆钻具及其试验台设计研究,得出了螺杆钻具在试验台上的优化结果。一方面流固耦合计算显示定子衬套的脆弱部位是定子与转子的啮合处,提出优化螺杆马达的方法,通过在外径160mm的衬套减少5mm的厚度进行优化,优化结果显示减少5mm后的定子衬套总变形减少,转子的密封压力增大,密封性得到增强;另一方面模态分析显示螺杆马达转子不会与试验台及其它激励源发生共振,结构变形小,满足试验要求。通过对螺杆马达转子中心去除直径40mm的圆柱材料进行轻量化设计,并经过分析验证了优化后的马达转子符合工作要求,提高了螺杆马达的性能,为以后的研究改进提供了参考。
[Abstract]:Oil, as the blood of industrial development, is not only the source of power fuel, but also its extract into every aspect of our life. With the deepening of mining depth and the increase of drilling difficulty, screw drilling tools are required to have higher performance. The design of screw drilling tools affects the efficiency and level of drilling work. Therefore, it is necessary to test the performance parameters of screw drilling tools before they are put into drilling operation, which is usually carried out on the test bed of screw drilling tools. The screw drill tool and its test-bed are from the enterprise. The finite element analysis software ANSYS is used as the analysis platform. On the basis of the existing analysis examples, the fluid-solid coupling calculation and modal analysis of the screw drill tool are carried out. This paper mainly studies screw drill tool from two aspects. Firstly, by analyzing the structure and working principle of the screw drilling tool, the discrete points are established according to the linear characteristics and the linear shape of the screw motor is generated by MATLAB curve fitting, and the finite element model of the screw motor is constructed. The static analysis and fluid-solid coupling calculation of the screw motor were carried out by using ANSYS. The pressure distribution and velocity distribution of the high pressure drilling fluid were obtained, and the stator of the screw motor was optimized by the analysis. The second is the modal analysis of the stator of the screw motor. The finite element model of the test stand is constructed and the modal analysis is carried out. The natural frequency of other equipments of the test bed is calculated, and the natural frequency of the screw motor is compared with the frequency of other external excitation sources. The rotor of screw motor is optimized. According to the above two aspects, the design of screw drill tool and its test rig are studied, and the optimized results of screw drilling tool on test bench are obtained. On the one hand, the fluid-solid coupling calculation shows that the weak part of the stator bushing is the meshing place between the stator and the rotor. The method of optimizing the screw motor is put forward to optimize the thickness of the 5mm by reducing the thickness of the 5mm in the outer diameter 160mm bushing. The optimization results show that the total deformation of stator bushing is reduced and the sealing pressure of the rotor is increased, and the sealing property is enhanced after the reduction of 5mm. On the other hand, the modal analysis shows that the rotor of the screw motor will not resonate with the test bed and other excitation sources. The deformation of the structure is small and meets the test requirements. Through the lightweight design of cylindrical material for removing diameter 40mm from the rotor center of screw motor, the optimized rotor meets the working requirements and improves the performance of screw motor, which provides a reference for further research and improvement.
【学位授予单位】：贵州师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE921.2

【参考文献】