管柱脱落是自由式管柱结构经常发生的一种现象，这是由于正常运转时转子旋转对定子产生的摩擦扭矩方向实际上是定子及油管的连接螺纹的卸扣方向，如果摩擦力矩大于油管扣的上扣扭矩，油管就脱扣。当尾管很重时，莫诺，还会出现螺纹掳扣。当管柱脱落时，通过作业重新连接好就能恢复生产。如果未发生螺纹掳扣，可以采取对扣方式打捞，如果发生掳扣，必须下打捞工具进行打捞。Column shedding is a common phenomenon of free tube structure， which is due to the direction of rotation of the friction torque generated by the stator rotor during normal operation is actually a stator and tubing connection1 screw shackle direction， if the friction torque is greater than the pipe le on torque， oil pipe tripping. When the tail pipe is very heavy， there will also be a thread caption. When the pipe column falls off， the production can be restored by reconnecting the work. If the le is not threaded， it can be salvaged by the way of the le. If the le occurs， the fishing tool must be salvaged.
Ａ、定子A， stator定子是螺杆泵的一个关键部件，并直接影响到井下机组的寿命。定子制造质量越高，井下机组的寿命就越长。定子的作用就是提供转子工作和液体抽汲的螺旋腔，其结构非常简单，由钢制外壳和塑料／橡胶衬套内腔有双螺旋、三螺旋、四螺旋甚至五螺旋、六螺旋，在相同尺寸下，螺旋数越多，泵的排量越高。The stator is a key component of the screw pump， which directly affects the life of the downhole unit. The higher the quality of the stator， the longer the life of the downhole unit. The role is to provide a rotor stator and liquid pumping spiral cavity drain， the structure is very simple， a steel shell and a plastic / rubber bushing cavity with double helix， three helix， four or even five， six spiral helical spiral， in the same size， the number of spiral， the displacement of the pump is high.
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