Effects of phase change specially steam condensation in enhanced oil recovery (EOR) processes such as steam assisted gravity drainage are a key important factor. Due to the last developments in nanotechnology, it is of great interest to use nanoparticles along with hot fluids to increase EOR efficiency. In current research, effects of phase change (steam condensation) on oil recovery from a two-dimensional porous medium during the injection of steam carrying alumina nanoparticles were studied. Additionally, fluid–fluid interfacial morphology development at different injection fluid temperatures i.e., 100, 110, 150, and 200 °C was examined. The governing equations of multi-phase fluid flow along with phase change were solved using finite volume computational technique. Comparing the results of oil recovery factor between phase change and non-phase change cases at 110 °C showed that initially the oil recovery factor in the case of non-phase change increases sharply, but as time goes on, the efficiency of phase change case becomes greater than that of non-phase change case mainly due to the large variations in fluid properties. It was also predicted that in injection of fluid at different temperatures, initially the recovery of oil grows sharply for 200 °C, but the final results of injected fluid with 110 °C achieves the highest efficiency of 67.5%. The final oil recovery at 110 °C increased by 21.5% compared to 200 °C. Moreover, the results predicted that the trend of oil recovery at different injection temperatures had a non-monotonic behavior over the time. Besides, the results showed that the amount of liquid water accumulation in the porous medium was reduced by increasing the injection temperature due to the low resident time and high energy content of the injected fluid at higher temperatures. Overall, the resident time of the injected fluid, its initial energy content (injection temperature), and phase change are the most vital factors in oil recovery factor enhancement.

相变特别是蒸汽冷凝在蒸汽辅助重力泄油等提高采收率 (EOR) 过程中的影响是一个关键的重要因素。由于纳米技术的最新发展，使用纳米颗粒和热流体来提高 EOR 效率非常有趣。在目前的研究中，研究了在注入带有氧化铝纳米颗粒的蒸汽期间相变（蒸汽冷凝）对二维多孔介质采油的影响。此外，还研究了不同注入流体温度（即 100、110、150 和 200 °C）下的流体-流体界面形态发展。使用有限体积计算技术求解了多相流体流动随相变的控制方程。比较110℃相变和非相变情况下的采收率结果表明，最初非相变情况下的采油率急剧增加，但随着时间的推移，相变情况的效率变得大于非相变情况，主要是由于流体性质的大变化。也有人预测，在不同温度下注入流体时，200℃初期采油率急剧上升，但最终结果是110℃注入流体达到了67.5%的最高效率。与 200 °C 相比，110 °C 下的最终石油采收率提高了 21.5%。此外，结果预测，随着时间的推移，不同注入温度下的采油趋势具有非单调行为。除了，结果表明，由于在较高温度下注入流体的低停留时间和高能量含量，提高注入温度会减少多孔介质中液态水的积累量。总的来说，注入流体的停留时间、初始能量含量（注入温度）和相变是提高采收率的最重要因素。