通过对螺杆泵采油系统进行分析，得到抽油杆柱力学模型，并对杆柱所承受载荷进行推导计算。
Analysis screw pump system, get the mechanical model of rod string, deduct and calculate undertaking load of rod string.
本文主要讨论了矿物解离度、矿浆浓度和循环泵压力对浮选柱分选指标的影响。
This paper discussed three parameters:degree of separation, concentration of mine and pressure of circle pump.
之后司钻上提整个钻柱，移去卡瓦，在开泵并旋转的同时小心地下放钻柱，当钻头接触到井底之后，重新开始钻进。
The driller then picks up the entire drillstring to remove the slips, carefully lowers the drillstring while starting the pumps and rotary, and resumes drilling when the bit touches bottom.
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