激光表面改性油管与接箍磨损配合研究

Study on the Wear Matching of Laser Surface Modified Oil Tubing and Oil-sucker Rod Coupling

油田机采井抽油杆接箍与油管在工作状态下构成滑动摩擦副,同时还承受介质腐蚀和交变载荷,产生磨损、腐蚀和疲劳断裂失效。为了解决有杆泵井的管杆偏磨问题,采用5 kW横流CO2激光器对油管内壁和接箍表面进行强化处理,并进行摩擦磨损试验。结合激光强化层的组织分析,对比研究不同油管接箍构成的摩擦副的摩擦磨损性能。结果表明:激光相变硬化油管与激光熔覆Ni35接箍的配合效果比较理想;在摩擦磨损过程中,管杆间磨损以磨粒磨损为主。

Oil-sucker rod coupling and oil tubing constitute sliding friction pairs in the work state in the oil wells. The friction pair withstands corrosion and alternate load, which cause wear, corrosion and fatigue failure. In order to solve the problems of the side wear between the oil tubing and coupling in the oil wells, a 5 kW transverse-flow CO2 laser was applied for laser cladding of coupling and laser transformation hardening of the oil tubing inwall, and rubbing wear experiments were carried out to study on the wear resistance of different friction mates. Some comparisons were made to analyze the tribological behaviors of different friction mates combining with analysis of the microstructure. The results show that the match between laser transformation hardening oil tubing and laser cladding coupling is the better choice. The wear of oil tubing and coupling is dominated by abrasive wear.