管柱脱落的故障现象是:运行电流很低,基本上是电机的空载电流,除了有一股一股的气外,井口基本上无产液,正发循环时油套连通。The failure phenomenon of the string is: the running current is very low, basically the motor"s no load current. Besides the gas with a single strand of gas, the wellhead basically has no liquid production, and the oil sleeve is connected when circulating.减少管柱脱落的措施有:将油管上扣扭矩由原来的值提高到值;采用油管螺纹垫片;定子上的装卸短节采用防松螺纹连接;采用油管锚或张力封隔器固定螺杆泵。The measures to reduce the falling off of the pipe string are as follows: increase the torque from the original value to the maximum value; use the oil pipe screw gasket; the loading and unloading joint on the stator is connected by loosening screw thread; and use the oil pipe anchor or tension packer to fix the screw pump.

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 c***ity drain, the structure is very simple, a steel shell and a plastic / rubber bushing c***ity 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.
单螺杆泵的使用方法:
单螺杆泵在发达***已广泛使用,德国称“偏心转子泵”。由于其单螺杆泵在发达***已广泛使用,德国称“偏心转子泵”。由于其优良的性能,在国内的应用范围也在迅速扩大。它的特点是对介质的适应性强、流量平稳、压力脉动小、自吸能力高,这是其它任何泵种所不能替代的。
单螺杆泵使用方法,螺杆泵使用注意事项:
1、启动螺杆泵前还得必须先确定螺杆泵的运转方向,单螺杆泵不能反转。
2、螺杆泵严禁在泵腔无液体的情况下空运转,必须在启动前由泵进口把液体注入泵体后再启动螺杆泵,以免空转磨损螺杆泵定子。

单螺杆泵有以下优点:
1)因为泵内的回转部件惯性力较低,故可使用很高的转速;
2)结构坚实,安装***容易;
3)单螺杆泵的压力和流量范围宽阔。压力约在3.4-340千克力/cm2,流量可达18600cm3/分;
4)单螺杆泵的吸入性能好,具有自吸能力;
5)与其它回转泵相比,对进入的气体和污物不太敏感;
6)流量均匀连续,振动小,噪音低;
7)单螺杆泵的运送液体的种类和粘度范围宽广。
单螺杆泵的缺点是,螺杆的加工和装配要求较高;泵的性能对液体的粘度变化比较敏感。