同时分析了下冲程抽油杆所产生的螺旋弯曲变形。

Deformation of helical buckling appeared on rod during down stroke is also analyzed.

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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。

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%.

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以抽油杆柱为研究对象，论述了斜直井游梁式抽油机冲程和冲次的计算方法。

Taking the rod string as the object of study, a method of computing pumping stroke and speed of walking beam pumping units for slant straight wells is also presented.

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