接触载荷对CT80连续油管摩擦磨损性能的影响

Effect of Load on Friction and Wear Performance of CT80 Tubing

为了解采油过程中CT80连续油管内置电缆的摩擦磨损性能,模拟该磨损环境,表征了载荷对油管摩擦磨损行为的影响,讨论了油管磨损机制。在试验压力50~200 N间,基于油管失重计算其壁厚减薄量、磨损率,采用扫描电子显微镜及金相显微镜对油管磨损表面及截面形貌进行了表征。结果表明:摩擦系数随着载荷增加而升高;载荷低于100 N时,随着载荷增大油管磨损率、失重和壁厚减薄量快速增加,当载荷大于100 N时增长趋势平稳;随着载荷增加,CT80磨损区域的晶粒变形程度升高,导致该区域发生冷变形强化;载荷低于100 N时油管主要发生磨粒磨损;载荷大于100 N时除了磨粒磨损外油管还发生了腐蚀磨损;油管磨损率等参数的变化可能与其冷变形强化有关。

To monitor the change of the friction and wear behaviors of the CT80 tubing during oil recovery process,the influence of load on the friction and wear behaviors of the tubing was characterized by simulating the wear environment,and the wear mechanism was discussed.Subsequently,the wear rate and thickness reduction of oil tubing were calculated based on its weight loss when the loads were in the range of 50 N to 200 N,and the wear surface and cross-sectional morphologies of oil tubing were observed by scanning electron microscope(SEM)and metallographic microscope.Results showed that the friction coefficient increased with the increase of load.When the load was less than 100 N,the weight loss,thickness reduction and wear rate of the CT80 increased rapidly as the load increased,while the growth trends became stable when the load was higher than 100 N.Moreover,with the increase of the load,the degree of grain deformation under the wear area increased,which led to cold deformation strengthening.The main wear form was abrasive wear under less than 100 N of the load.Furthermore,when the load was higher than 100 N,in addition to abrasive wear,corrosion also occurred.In general,the change of the wear rate might be related to the cold deformation strengthening.