| 摘要 |
A method and apparatus are provided herein for controlling the speed of a progressing cavity liquid well pump by driving the pump with a variable spee d drive device while measuring the amount of liquid production from the pump. The speed of the pump is continuously varied in speed steps, either upwardly or downwardly, by the variable speed drive device while measuring liquid production, to maintain a linear relationship between liquid production and pump speed.< /SDOAB>
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