定向井抽油杆柱防偏磨扶正环优化配置研究

The Research of Centralizer Optimal Configuration for Rod Anti-eccentric in the Controlled Directional Well

在定向井中由于井眼弯曲,导致杆管自然接触,在运动过程中发生摩擦磨损,造成杆管偏磨现象。考虑井斜及方位角的影响,通过对抽油杆柱受力情况进行分析,建立了数学模型,推导出了简支梁失稳间距方程,应用MATLAB软件编程计算出了定向井中扶正环的合理安放位置。最后,根据大量试验井计算结果,总结出了一套符合现场实际操作的扶正环布置方案。在某油田计算了12口斜井数据并进行了现场应用,优化后发现,三段型井和五段型井安装扶正器的数量较之常规方法分别减少了19.60%和10.55%,目前这些油井均正常生产。

In the controlled directional well, rod and tubing will contact because of wellbore bending, which could lead to rubbing wear during movement, resulting the eccentric wear between rod and tube. Considering the effects of deviation angle and azimuth angle, then derive the destablization equation of simple beam by analyzing the force condition of rod string and constructing the mathematics model, finally calaulate the reasonable assign position of centralizer by MATLAP, pro gramming. Based on a great number of computational solution, we conclude a layout scheme accord with actual operation of oil field. 12 wells in one oil field are calculated and applied to the field, the reduction ratio of optimized centralizer is 19.60% in three section type wells, and 10.55% in five section type wells, at present this wells are in normal production.