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首页> 外文会议>2018 17th International Ural Conference on AC Electric Drives >Frequency elastic drive system operation of sucker rod pumping system
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Frequency elastic drive system operation of sucker rod pumping system

机译：抽油杆抽油机系统的频率弹性驱动系统运行

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The scope of this initiative is to introduce a frequency elastic drive system for sucker rod pumping systems to reduce operating costs, provide a grid load at reduced power peaks as well as to increase the meantime between failures (MTBF) by reducing stresses in the system. Field test results of the presented operation mode, obtained by an efficient monitoring system, have shown promising results. Conventional electrical engine driven sucker rod pumping systems operate under a constant motor frequency of normally 50Hz. If equipped with a variable speed drive (VSD), the frequency can vary but is still kept constant over the whole pumping cycle. As a result of the constant rotation speed, the system components are suffering under given peak loads and torques coming from the load behavior. The methodology presented enables an operation mode that is able to reduce high accelerations and decelerations of the system during one pumping cycle by adjusting the motor frequency automatically according to the system's needs. The key of this methodology is the correct adjustment of the motor frequency, which has to be defined for each sucker rod pumping system individually. Generally, during peak load sections, the frequency is reduced which causes a slowing down of the pumping unit to reduce the load, essentially at the beginning of the upstroke and the downstroke, where the polished rod, respectively the counter weights, are lifted. During the remaining stroke, the system is accelerated to obtain the same cycle time as for the standard fixed frequency operation mode. This paper presents how to specify the frequency elastic operation mode and a case study for different stroke profiles. Recently performed tests and simulations have already shown the successful application of this technology in the field. The most significant results, obtained during the tests, have shown a clear reduction of the peak load at the surface structure, a higher electrical efficiency and a better volumetric efficiency of the downhole pump. In general, the frequency elastic drive operation results in an essential decrease of the electrical energy consumption and a reduction of the systems mechanical stresses, causing a tremendous increase in the lifetime of the sucker rod pumping system. The presented knowledge is essential for the improvement of existing and future sucker rod pumping systems. By using the proposed technology, the system performance as well as the meantime between failures can be extended essentially.
机译：该计划的范围是引入用于抽油杆抽油系统的频率弹性驱动系统，以降低运行成本，以降低的功率峰值提供电网负载，并通过减少系统中的应力来增加平均故障间隔时间（MTBF）。通过有效的监控系统对所提出的操作模式进行的现场测试结果显示出了令人鼓舞的结果。常规的由发动机驱动的抽油杆抽油系统在通常为50Hz的恒定电动机频率下运行。如果配备了变速驱动器（VSD），则频率可以变化，但在整个泵送周期内仍保持恒定。由于转速恒定，系统组件在给定的峰值负载下承受着来自负载行为的转矩。所介绍的方法论使一种运行模式成为可能，该模式可以根据系统的需要自动调节电动机频率，从而在一个泵送周期内减少系统的高加速度和减速度。这种方法的关键是正确调整电动机频率，必须分别为每个抽油杆抽油系统定义电动机频率。通常，在峰值负载部分期间，频率降低，这导致泵送单元的减慢以减小负载，基本上在上冲程和下冲程的开始处，在该开始时，抛光杆或配重被举起。在剩余行程中，系统将加速以获取与标准固定频率操作模式相同的循环时间。本文介绍了如何指定频率弹性操作模式以及针对不同冲程轮廓的案例研究。最近进行的测试和模拟已经显示了该技术在该领域的成功应用。在测试过程中获得的最重要的结果表明，表面结构的峰值负荷明显降低，井下泵的电效率更高，容积效率更高。通常，频率弹性驱动操作导致电能消耗的显着降低和系统机械应力的降低，从而导致抽油杆抽油系统的使用寿命大大增加。所提供的知识对于改进现有和将来的抽油杆抽油系统至关重要。通过使用所提出的技术，系统性能以及故障间隔时间可以得到实质性的扩展。

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