The control rod string which is consisted of pumping rod and controller is tripped into the release string.
抽油杆与控制器组成的控制杆柱下入到丢手管柱内，控制杆柱上部与杆式泵的进油孔相连。
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.
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.
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。
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