Abstract: At present,there are more and more complex wellbores in oilfields,such as inclined well,directional well,lateral well and so on.Sucker rods bucking and wellbore bending can lead to serious eccentric wear of sucker rods.To solve this problem,this paper presents a finite element method (FEM) for dynamics behavior of sucker rods.The wear prediction model of sucker rod and tubing is established based on the energy principle.The fraction power which is generated by the robpipe wear and energy loss are connected in making this model.By using this FEM simulation in an instance,we can calculate the contact force on the rob.As a result,wear volume loss between sucker rods and tubing could be quantitatively analysed.The results show that FEM analysis is effective to predict the wear situation of eccentric wear between sucker rods and tubing.It also helps oil fields in adopting reasonable measures to preventing eccentric wear.

Key words: sucker rod, tubing, 3D wellbore, finite element simulation, abrasion prediction