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。Thefailurephenomenonofthestringis:therunningcurrentisverylow,basicallythemotorsnoloadcurrent.Besidesthegaswithasinglestrandofgas,thewellheadbasicallyhasnoliquidproduction,andtheoilsleeveisconnectedwhencirculating.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。Themeasurestoreducethefallingoffofthepipestringareasfollows:increasethetorquefromtheoriginalvaluetothemaximumvalue;usetheoilpipescrewgasket;theloadingandunloadingjointonthestatorisconnectedbylooseningscrewthread;andusetheoilpipeanchorortensionpackertofixthescrewpump.定转子过早磨损Prematurewearoffixedrotor定转子过早磨损主要是由于定转子的间隙过小引起的。Theprematurewearofthefixedrotorismainlycausedbythe***allgapbetweenthefixedrotorandtherotor.油管与抽油杆柱磨损Oilpipeandrodstringwear油管与抽油杆柱磨损的原因一是因为井斜抽油杆贴在油管壁上引起的，可以通过加抽油杆扶正器使抽油杆柱居中来减轻或消除，另一个原因是定转子不同心及转子的偏心运动造成的，在定子以上加一节内径较大的回转筒即可避免。Tubingandsuckerrodwearreasonisbecausethedeviationofsuckerrodattachedtothetubingwallcausedbyheating,pumpingrodcentralizermaketherodcentertoreduceoreliminate,anotherreasoniscausedbytheeccentricmotionoftherotorandtherotorarenotconcentric,***oidadaythediameterofrotarycylinderinthestatorcanbelargerthan.Ｅ、抽油杆扶正器E,suckerrodcentralizer抽油杆扶正器由心轴和扶正筒组成，它接在两根抽油杆之间，被卡在两个抽油杆接箍之间。心轴也就是一要极短的抽油杆短节。扶正筒是一个内孔比心轴大１ＭＭ左右的空心塑料筒，外部有四个略比油管内径小的扶正翼，采取浇注成型。扶正筒可以围绕心轴转动，防止抽油杆旋转时与内壁接触而磨蚀油管，又可以让流体通过。Thesuckerrodcentralizeriscomposedoftheheartshaftandtheuprightcylinder,whichisconnectedbetweenthetwosuckerrodsandisstuckbetweenthetwosuckerrodhoops.Theaxisoftheheartisalsoanextremelyshortrodshortsection.ThecenteringcylinderisahollowplastictubeinnerholeBixinshaftaround1MM,externalfourslightly***allerthanthediameterofthetubingcentralizerwing,adoptcasting.Thecentralizercanrevolvearoundtheaxistopreventthesuckerrodfromtouchingtheinnerwallwhenitrotates,anditcanalsoletthefluidpassthrough.现将在现场采用同规格的G型单螺杆泵及齿轮泵在完全相同工况条件下并在输送出口压力为1MPa时进行了简单的对比,测量了这样两组数据:当输送重油粘度约为75×102-6m2/s时,齿轮泵出口压力表的指针跳动幅度为±0.16,三螺杆泵出口压力表的指针跳动幅度为±0.05,双螺杆泵出口压力表的指针跳动的幅度为±0.04;而当输送重油粘度约为150×102-6m2/s时,齿轮泵出口压力表的指针跳动幅度为±0.22,三螺杆泵出口压力表的指针跳动的幅度为±0.06,双G型单螺杆泵出口压力表的指针跳动的幅度为±0.04。这说明,G型单螺杆泵在重油的输送和喷燃过程中,介质的输送压力很稳定。并且随着介质粘度的加大,G型单螺杆泵(尤其是双螺杆泵)的无脉动特点相比之下更为明显。)