Abstract: With the development of tertiary oil recovery technique,pressure fluctuation has become an important new technique for enhancing oil recovery.By means of high ferquqency pulsation pressure servo system,the effect of pressure fluctuation on rock wettability was researched experimentally.The wettability of core before and after vibration was qualitatively and quantitatively analyzed.It is concluded that pressure fluctuation considerably affected core wettability,namely,the wettability of core after vibration varied from neutrality to water wettability and from weak hydrophilicity to strong water wettability.

Key words: pressure fluctuation, oil recovery mechanism, self-soaking method, inherent frequency, wettability, simulation test

摘要： 随着三次采油技术的不断发展,压力波动采油已成为一种重要的采油新技术.利用高频脉动压力伺服系统进行了压力波动对岩石润湿性影响的室内实验研究,并对岩石在振动前后的润湿性进行了定性和定量分析,得出了压力波动对岩石润湿性具有较大影响的结论,即岩石在振动后其润湿性由中性向亲水性转化,由弱亲水向强亲水性转化,这有利于原油的增产与采收率的提高.

关键词: 压力波动, 采油机理, 自吸法, 固有频率, 润湿性, 模拟实验