Puyang Junhong Rubber Co., Ltd.

Puyang Junhong Rubber Co., Ltd.

The force of sucker rod centralizer is analyzed

2021 09/23

It is well known that eccentric wear of sucker rod centralizer and tubing has always been a big problem affecting the normal operation of production.The analysis of eccentric wear of sucker rod is generally considered from the following aspects:combination of sucker rod,material of sucker rod,sucker rod centralizer,optimization of production parameters,downhole fluid characteristics and so on.With the oilfield entering the period of ultra-high water cut and chemical oil recovery,the phenomenon of partial wear is more and more serious.
centralizer
During power transfer,the load of sucker rod centralizers varies with the position of sucker rod centralizers,with the upper sucker rod centralizers having a large load and the lower sucker rod centralizers having a small load.

Sucker rod centralizers usually have the following loads:

1.Weight of sucker rod centralizer;

2.Liquid column weight above the plunger in the tubing;

3.Pressure generated by wellhead back pressure;

4.The friction between plunger and pump barrel,sucker rod centralizer and its collar and tubing,tubing and liquid column,sucker rod centralizer and liquid injection,and liquid internal viscous force;

5.Buoyancy of liquid in string to sucker rod centralizer;

6 sucker rod centralizer and liquid column inertia force;

7.Vibration force caused by elastic deformation of sucker rod centralizer;

8.Impact load caused by inconsistent liquid and piston movement or pump not full.