... 升降阀 lifting valve 升降法 lifting and lowering method 升降杆 lifter; lifting bar; lifting poker; lifting rod ...
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Method Large diameter oil tube and weighting rod are adopted to decrease lifting resistance of crude oil and to increase lowering-in energy of the string.
方法采用增大油管直径和下加重杆技术，来减少油流上升阻力和增大杆柱下行动力。
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