In this work, the cavitation water jet technique was used to clean the inner walls of oil pipes after tertiary oil recovery. The surface morphology, depth of impinging pits, and corrosion resistance of aluminum samples after impingement with the cavitation water jet were examined using scanning electron microscopy (SEM), 3D microscopy, and an electrochemical workstation. When the inlet pressure was higher than 3$$MPa, the number of cavitation bubbles generated by the cavitation nozzle increased with an increase in inlet pressure. Moreover, the cleaning effect that the cavitation water jet had on the aluminum samples was higher than that of general water jet technology. There were no obvious changes to the surface of the aluminum samples when the inlet pressure was decreased to 13$$MPa. Meanwhile, the mass loss of aluminum samples also increased. However, the internal corrosion resistance of the pipe wall after impact was relatively low. These results indicate that the impinging efficiency of the cavitation water jet was obviously enhanced and the degree of damage to the oil pipe wall was low at an inlet pressure of 15$$MPa. The best target distance was 8–12$$mm, and at this point, the jet flushing effect was the best. Moreover, the jet velocity at the outlet cavity was 184$$m/s, and the jet strike area was 250$$mm².

本工作采用空化水射流技术对三次采油后的油管内壁进行清洗。使用扫描电子显微镜 (SEM)、3D 显微镜和电化学工作站检查了铝样品在受到空化水射流冲击后的表面形貌、冲击坑深度和耐腐蚀性。当入口压力高于 3$$MPa，空化喷嘴产生的空化气泡数量随着入口压力的增加而增加。此外，空化水射流对铝样品的清洗效果高于一般水射流技术。当进口压力降低到 13 时，铝样品表面无明显变化$$兆帕。同时，铝样品的质量损失也有所增加。但冲击后管壁的内耐蚀性相对较低。这些结果表明，在入口压力为 15$$兆帕。最佳目标距离为 8-12$$mm，此时喷射冲洗效果最好。此外，出口腔的射流速度为 184$$m/s，喷气打击面积为 250$$毫米²。