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Estimation of the minimum miscibility pressure for CO_(2)ecrude-oil systems by molecular dynamics simulation

Petroleum Research 2023年第1期8卷 1-10页

作者： Wuge Cui Yunfeng Liang Yoshihiro Masuda Takeshi Tsuji Toshifumi Matsuoka Haruka Takahashi Department of Systems Innovation School of EngineeringThe University of TokyoTokyo113-8656Japan Fukada Geological Institute Tokyo113-0021Japan JX Nippon Oil&Gas Exploration Corporation Tokyo100-8163Japan

CO_(2)injection is an effective enhanced oil recovery technique for energy security with the benefits of carbon *** reach the maximum oil recovery,the miscible condition between CO_(2)and oil needs to be maintained in the reservoir,which requires the operation pressure to be higher than the minimum miscibility pressure(MMP).There are two types of MMPs:the first-contact MMP(FC-MMP)and the multi-contact MMP(MC-MMP).In this study,molecular dynamics simulations were performed for the CO_(2)eoil interface system using two simplified digital oil models:a Bakken dead oil with four lumping components and a live-crude-oil model with 50 types of oil molecules but with no asphaltenes and heavy oil *** vanishing interfacial tension method was used to predict the *** CO_(2)eoil volume ratios were considered to mimic the different degrees of *** estimate the MMP accurately and rapidly,the interfacial tension in the low-pressure regime was used for the ***,different MMPs were obtained,where the MMP value increased with increasing CO_(2)eoil volume ***-MMP can be predicted when the CO_(2)eoil volume ratio is sufficiently *** the CO_(2)eoil volume ratio was approximately 9e10,MMP was closest to the actual MC-MMP *** condensing and vaporizing mechanism was also studied at the molecular *** pure CO_(2)was used,only the vaporizing effect on MMP *** was found that the intermediate C2eC6 components have the main effect on the MMP *** study can help to establish a computational protocol to estimate FC-MMP and MC-MMP,which are widely used in reservoir engineering.

关键词： CO_(2)-EOR Minimum miscibility pressure Molecular dynamics simulations condensing and vaporizing mechanism CO_(2)eoil volume ratio Crude oil

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