高温潜油电机设计及对地电容计算分析

发布时间：2018-07-24 18:17

【摘要】：在油田生产中潜油电泵所处工作环境温度较高,这就对潜油电机的性能提出了更高要求。为了提高稠油采收率，目前普遍使用蒸汽驱。蒸汽驱是将蒸汽注入到一口或多口井中，先通过加热把地下粘度较大的稠油降粘，降粘后的稠油在蒸汽蒸馏的作用下，原油会驱向邻近多口生产井，这样以便于采出。随着温度的升高，电机的效率下降，使用寿命也随之降低。在其它条件不变的情况下，要想延长潜油电机的运转寿命，现在普遍做法是通过降低潜油电机的电流，减小损耗，使得潜油电机自身温度的上升得到降低。目前大部分生产厂家都采用提高输入电压的方式来提高电机效率，这就随之带来另一个问题，随着输入电压和温度的升高，绕组绝缘被破坏，加上潜油电机细长结构，使得电机对地电容增大，对于中性点不接地电机，如果电容电流过大，这将会对绕组和定子铁心之间的绝缘造成损坏从而形成常见的单相接地故障，又恰巧出现另一接地点的话，，这样会造成匝间或着相间短路，从而对电机造成更严重的破坏。因此，对于高温潜油电机的对地电容不能再忽略，高温潜油电机对地电容的计算与分析具有迫切需求。本文结合工程实际，修正了潜油电机的设计方法。通过优化潜油电机端部漏抗和转子齿磁路计算以及机械损耗计算，针对潜油电机的细长结构，重新设计了斜槽，设计了全新的116型高温潜油电机。利用Ansoft/RMxprt软件对电机性能做了仿真分析，进一步确定电磁设计优化方案的合理性。用有限元分析方法建立考虑对地电容的潜油电机三维Ansys模型，用静电场分析方法求解出电容的数值解，并作出了考虑对地电容的端部等效电路。最后利用电路仿真软件Tina7所提供的电路分析计算的方法最后将定子绕组电位分布计算出来并根据计算结果绘制出电位分布曲线。通过分析绕组的电位分布，在提高输入电压时必须考虑对对地电容的影响。将额定电压提高1.2倍作为输入电压，既可以满足对地电容不被击穿，同时可以显著提高电机性能。
[Abstract]:The working environment of the electric submersible pump in oil field is relatively high, which puts forward higher requirements for the performance of the submersible motor. In order to improve heavy oil recovery, steam flooding is widely used at present. Steam flooding is the injection of steam into one or more wells, and the viscous oil with high underground viscosity is first reduced by heating. The crude oil will be driven to several production wells in the vicinity by steam distillation, so as to facilitate production. With the increase of temperature, the efficiency and service life of the motor decrease. In order to prolong the operating life of the submersible motor under other conditions, it is common to reduce the current and loss of the submersible motor and reduce the temperature rise of the submersible motor. At present, most manufacturers increase the efficiency of the motor by increasing the input voltage, which brings another problem. With the increase of the input voltage and temperature, the insulation of the windings is destroyed, and the submersible motor has a slender structure. If the capacitance current of the motor is too large, it will damage the insulation between the winding and the stator core, thus forming a common single-phase grounding fault, which makes the electrical capacitance to the ground of the motor increase, and for the neutral point ungrounded motor, if the capacitance current is too large, it will damage the insulation between the winding and the stator core. Another spot happens to occur, which can cause interturn or interphase short circuit, thus causing more serious damage to the motor. Therefore, the ground capacitance of high temperature submersible motor can no longer be ignored, and the calculation and analysis of the ground capacitance of high temperature submersible motor have an urgent need. In this paper, the design method of submersible motor is modified in combination with engineering practice. By optimizing the end leakage reactance, rotor tooth magnetic circuit calculation and mechanical loss calculation of the submersible motor, a new type 116 high temperature submersible motor is designed for the slender structure of the submersible motor. The performance of the motor is simulated and analyzed by using Ansoft/RMxprt software, and the rationality of the optimization scheme of electromagnetic design is further determined. The three-dimensional Ansys model of submersible motor considering ground capacitance is established by finite element method. The numerical solution of capacitance is solved by electrostatic field analysis method, and the end equivalent circuit with respect to ground capacitance is made. Finally, the potential distribution of stator windings is calculated by the method of circuit analysis and calculation provided by the circuit simulation software Tina7, and the potential distribution curve is drawn according to the calculated results. By analyzing the potential distribution of the winding, the influence on the earth capacitance must be considered when increasing the input voltage. If the rated voltage is increased by 1.2 times as the input voltage, it can not only satisfy the ground capacitance without breakdown, but also significantly improve the performance of the motor.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE93;TM302

【参考文献】