During oil recovery by rod pump, owing to the elastic stretching and shrinking of the tubing string, the stroke loss of the subsurface pump reaches 10%.
在有杆泵抽油过程中，因油管弹性伸缩，抽油泵冲程损失达10%以上。
The equation for calculating the fullness coefficient of a subsurface pump is derived.
推导出计算抽油泵充满系数的公式。
The equation for calculating the fullness coefficient of a subsurface pump is derived.
推导出计算抽油泵充满系数的公式。
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