基于有限元方法的抽油杆管磨损量预测

针对在斜直井、定向井、水平井等井中采取有杆泵采油作业时，由于抽油杆屈曲以及井眼弯曲导致抽油杆严重偏磨的问题，建立了抽油杆动态行为有限元分析方法。利用能量法原理，将抽油杆发生偏磨时产生的摩擦功与金属磨损消耗的能量联系起来，确定了有杆抽油系统杆管偏磨磨损量预测模型，利用有限元分析得到的接触力可以定量分析杆管柱的磨损量。结果表明，有限元方法模拟效果较好，可用于预测井下杆管偏磨情况，对油田采取合理的防偏磨措施具有重要的指导意义。

STUDY ON WEAR PREDICTION OF SUCKER ROD AND TUBING BASED ON FINITE ELEMENT METHOD

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.