Foam can mitigate the associated problems with the gas injection by reducing the mobility of the injected gas. The presence of an immiscible oleic phase can adversely affect the foam stability. Nevertheless, under miscible conditions gas and oil mix in different proportions forming a phase with a varying composition at the proximity of the displacement front. Therefore, it is important to understand how the compositional variations of the front affect the foam behavior. In this study through several core-flood experiments under miscible condition, three different regimes were identified based on the effects of the mixed-phase composition on CO₂ foam-flow behavior: In Regime 1 the apparent viscosity of the in-situ fluid was the highest and increased with increasing x_CO2. In Regime 2 the apparent viscosity increased with decreasing x_CO2. In Regime 3 the apparent viscosity of the fluid remained relatively low and insensitive to the value of x_CO2. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

---

混溶条件下成分变化对CO2泡沫的影响

泡沫可以通过降低所注入气体的迁移率来减轻与气体注入相关的问题。不混溶的油相的存在会不利地影响泡沫稳定性。然而，在可混溶的条件下，天然气和石油以不同的比例混合，在驱替前沿附近形成具有变化组成的相。因此，重要的是要了解前部的成分变化如何影响泡沫行为。在这项研究中，通过在混溶条件下进行的几次岩心驱替实验，根据混合相组成对CO ₂泡沫流动行为的影响，确定了三种不同的模式：在方案1中，原位流体的表观粘度为最高，并随着x _CO2的增加而增加。在方案2中，表观粘度随x _CO2的降低而增加。在方案3中，流体的表观粘度保持相对较低，并且对x _CO2的值不敏感。©2017美国化学工程师学会AIChE J，2017