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A substantial volume of oil is trapped in the reservoir after the primary and secondary recovery processes because of pressure and reservoir heterogeneity. Experimental results have indicated that silica nanoparticle (SNP) flooding is highly efficient in enhanced oil recovery (EOR). The performance is a function of preparation and modification processes. The use of SNP modified by (3–Aminopropyl) triethoxysilane (APTES) is yet to be extensively examined for potential use in EOR. In this study, a modified SNP was examined to determine its influence in EOR applications. Sessile drop technique was utilized to determine the effectiveness of the modified SNP in altering the wettability of the oil-wet sandstone core. Subsequently, the interfacial tension (IFT) between oil and water was also investigated. Furthermore, the oil displacement efficiency of the modified nanofluid was compared with the unmodified. Zeta …