School of Engineering, King's College, University of Aberdeen, Aberdeen AB24 3UE, UK.
School of Engineering, King's College, University of Aberdeen, Aberdeen AB24 3UE, UK.
Ultrason Sonochem. 2017 Mar;35(Pt A):243-250. doi: 10.1016/j.ultsonch.2016.09.026. Epub 2016 Sep 30.
CO flooding process as a common enhanced oil recovery method may suffer from interface instability due to fingering and gravity override, therefore, in this study a method to improve the performance of CO flooding through an integrated ultraosund-CO flooding process is presented. Ultrasonic waves can deliver energy from a generator to oil and affect its properties such as internal energy and viscosity. Thus, a series of CO flooding experiments in the presence of ultrasonic waves were performed for controlled and uncontrolled temperature conditions. Results indicate that oil recovery was improved by using ultrasound-assisted CO flooding compared to conventional CO flooding. However, the changes were more pronounced for uncontrolled temperature conditions of ultrasound-assisted CO flooding. It was found that ultrasonic waves create a more stable interface between displacing and displaced fluids that could be due to the reductions in viscosity, capillary pressure and interfacial tension. In addition, higher CO injection rates, increases the recovery factor in all the experiments which highlights the importance of injection rate as another factor on reduction of the fingering effects and improvement of the sweep efficiency.
CO 驱油法作为一种常见的提高采收率的方法，可能会由于指进和重力超覆而导致界面不稳定，因此，在本研究中，提出了一种通过集成超声-CO 驱油工艺来提高 CO 驱油性能的方法。超声波可以将能量从发生器传递到油中，并影响其内能和粘度等性质。因此，在受控和非控温度条件下进行了一系列带有超声波的 CO 驱油实验。结果表明，与常规 CO 驱油相比，超声辅助 CO 驱油可提高采收率。然而，对于超声辅助 CO 驱油的非控温度条件，变化更为明显。研究发现，超声波在驱替和被驱替流体之间形成了更稳定的界面，这可能是由于粘度、毛管压力和界面张力的降低所致。此外，更高的 CO 注入速率会增加所有实验中的采收率因子，这突出了注入速率作为减少指进效应和提高波及效率的另一个因素的重要性。
