Miscible CO₂-based enhanced oil recovery (CO₂-EOR) flooding has been used, on many occasions, to maximize the recovery by mobilizing the residual oil. The success of this method, however, depends highly on the minimum miscibility pressure (MMP), the compatibility of CO₂ with the reservoir rock and fluids. Although there have been several studies on the application of CO₂-EOR, the impact of oil compositions associated with MMP on the feasibility of this technique has not been addressed elsewhere. In this study, a simulation study was carried out to investigate the effect of three different oil compositions on the miscibility and ultimate oil recovery of miscible CO₂-EOR method. The results obtained indicated the oil type does not pose a significant impact on the success of miscible CO₂-EOR. It was also found that the ultimate recovery of oil increases in a short period of time by injecting CO₂ at the miscible conditions at the early stage of natural production. Comparatively, the reservoir with the fluid sample S2 seems to be a suitable choice for the miscible CO₂ flooding once the recovery factor was considered together with the total amount of the fluid injected and produced.

中文翻译：

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不同原油组成的油气藏中混溶CO 2驱的可行性

在许多情况下，已经使用基于可混溶的CO ₂的强化采油（CO ₂ -EOR）驱油，通过动员剩余油来最大化采收率。但是，该方法的成功很大程度上取决于最小混溶压力（MMP），CO ₂与储层岩石和流体的相容性。尽管已经有一些关于CO ₂ -EOR的应用的研究，但是与MMP有关的油组合物对该技术的可行性的影响尚未在其他地方解决。在这项研究中，进行了模拟研究，以研究三种不同的油成分对可混溶CO ₂的混溶性和最终采油率的影响。-EOR方法。获得的结果表明，油的类型不会对可混溶的CO ₂ -EOR的成功产生重大影响。还发现在自然生产的早期阶段，通过在可混溶条件下注入CO _2可以在短时间内提高石油的最终采收率。相比之下，一旦将采收率与注入和产出的流体总量一起考虑，带有流体样品S2的储层似乎是混溶CO ₂驱油的合适选择。