文章对抽油杆柱断脱的设计方法进行了详细的理论分析，指出了其中存在的问题。
The paper gives a detailed analysis of the design method causing rod string dropout and points out its inadequacies.
针对井口驱动螺杆泵抽油杆柱断脱频繁的问题，应用弹塑性理论分析了抽油杆柱在井中的受力状况。
In the light of the frequent breaking of the rod string in a surface driven screw pump well, the force condition of the string in the well is analyzed by means of the elastoplasticity theory.
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