The phenomenon of water sensitivity often occurs in the oil reservoir core during the process of crude oil production, which seriously affects the efficiency of oil extraction. In recent years, near-well ultrasonic processing technology attaches more attention due to its safety and energy efficient. In this paper, the comparison of removing core water sensitivity by ultrasonic wave, chemical injection and ultrasound–chemical combination technique are investigated through experiments. Results show that: lower ultrasonic frequency and higher power can improve the efficiency of core water sensitivity removal; the effects of removing core water sensitivity under ultrasonic treatment get better with increase of core initial permeability; the effect of removing core water sensitivity using ultrasonic treatment won’t get better over time. Ultrasonic treatment time should be controlled in a reasonable range; the effect of removing core water sensitivity using chemical agent alone is slightly better than that using ultrasonic treatment, however, chemical injection could be replaced by ultrasonic treatment for removing core water sensitivity from the viewpoint of oil reservoir protection and the sustainable development of oil field; ultrasound-chemical combination technique has the best effect for water sensitivity removal than using ultrasonic treatment or chemical injection alone.

在原油生产过程中，储油核心经常出现水敏现象，严重影响了采油效率。近年来，近井超声处理技术因其安全性和节能性而倍受关注。通过实验研究了超声波，化学注入和超声-化学结合技术去除核心水敏感性的比较。结果表明：较低的超声频率和较高的功率可以提高岩心水敏感性的去除效率。随着岩心初始渗透率的增加，超声处理去除岩心水敏感性的效果更好。随着时间的流逝，使用超声波处理去除核心水分敏感性的效果不会变好。超声波治疗时间应控制在合理范围内；单独使用化学剂去除核心水敏感性的效果略好于超声处理，但是从保护油藏和油田可持续发展的角度来看，可以通过超声波处理代替化学注入来去除核心水敏感性。与单独使用超声处理或化学注射相比，超声-化学结合技术对水敏感性的去除效果最佳。从油藏保护和油田可持续发展的角度出发，可以用超声波处理代替化学注入来消除岩心水敏感性。与单独使用超声处理或化学注射相比，超声-化学结合技术对水敏感性的去除效果最佳。从油藏保护和油田可持续发展的角度出发，可以用超声波处理代替化学注入来消除岩心水敏感性。与单独使用超声处理或化学注射相比，超声-化学结合技术对水敏感性的去除效果最佳。