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- W2059834489 abstract "Summary The expanding usage of variable-speed drives (VSD's) indicates that their effects on electrical submersible pump (ESP) performance and longevity merit investigation. This paper demonstrates that speed variation makes ESP equipment selection more complex and critical if maximum pump life is to be achieved. Thrust wear can dramatically affect pump longevity. A common conception is that the rates identifying acceptable thrust limits for any pump speed would be the affinity-law projections of the defining rates at 60 cycles/sec [60 Hz]. This would result in a diverging thrust range as speed increases. This paper (1) shows the fallacy of this concept; (2) demonstrates mathematically and graphically that as speed increases, the thrust range converges; (3) expresses the need for verification of the calculated data with actual measurements; and (4) discusses potential pump damage caused by internal recirculation cavitation at high pumping speeds and the increased exposure’ to vibration damage resulting from speed variation. The benefits of speed variation are summarized. A specific ESP was selected as a typical pump for illustration. Data were normalized by dividing all characteristics by those occurring at the peak efficiency point. The pump performance data thus obtained are used to illustrate techniques for designing a pump to be driven at variable or nonstandard speeds. An operating window is presented that is bounded by the thrust range limits and by the head-vs.-rate curves that correspond to the maximum and minimum driving frequencies to be considered. This is used in the discussion of VSD applications relative to wells of improving productivity and well testing. Also, the pump/motor mismatch inherent in wide-speed-range applications and resultant low motor efficiency are demonstrated." @default.
- W2059834489 created "2016-06-24" @default.
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- W2059834489 date "1987-02-01" @default.
- W2059834489 modified "2023-09-27" @default.
- W2059834489 title "Effects of Speed Variation on the Performance and Longevity of Electric Submersible Pumps" @default.
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- W2059834489 doi "https://doi.org/10.2118/14349-pa" @default.
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