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• W2894501365 abstract "The low-salinity waterflooding is an attractive eco-friendly producing method, recently, for carbonate reservoirs. When ferrous ion is present in the formation water, that is, acidic water, the injection of low-salinity water generally with neutral pH can yield precipitation or dissolution of Fe-minerals by pH mixing effect. FeSO 4 and pyrite can be precipitated and re-dissolved, or vice versa, while siderite and Fe(OH) 2 are insoluble which are precipitated, causing permeability reduction. Particularly, pyrite chemically reacts with low-salinity water and release sulfate ion, altering the wettability, favorably, to water-wet. In this aspect, we analyzed oil production focusing on dissolution of Fe-minerals and Fe-precipitation using a commercial compositional reservoir simulator. From the simulation results, the quantities of precipitation and dissolution were enormously large regardless of the type of Fe-minerals and there was almost no difference in terms of total volume in this system. However, among Fe-minerals, Fe(OH) 2 precipitation and pyrite dissolution were noticeably large compared to troilite, FeSO 4 , and siderite. Therefore, it is essential to analyze precipitation or dissolution for each Fe-mineral, individually. Meanwhile, in dissolving process of pyrite, sulfate ions were released differently depending on the content of pyrite. Here, the magnitude of the generated sulfate ion was limited at certain level of pyrite content. Thus, it is necessary to pay attention for determining the concentration of sulfate ion in designing the composition of injection water. Ultimately, in the investigation of the efficiency of oil production, it was found that the oil production was enhanced due to an additional sulfate ion generated from FeS 2 dissolution." @default.
• W2894501365 created "2018-10-05" @default.
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• W2894501365 date "2018-09-23" @default.
• W2894501365 modified "2023-09-25" @default.
• W2894501365 title "Enhanced oil recovery efficiency of low-salinity water flooding in oil reservoirs including Fe2+ ions" @default.
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• W2894501365 doi "https://doi.org/10.1177/0144598718800727" @default.
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