ArticleACS omega2026
Modified Starch Flooding in Carbonates: Impact on Oil Recovery and Crude Oil Composition.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Enhanced oil recovery (EOR) in carbonate reservoirs has been a persistent challenge due to their complex wettability and heterogeneity. In a previous study, the introduction of quaternary ammonium groups was shown to increase the amphiphilic character and solubility of the starch derivatives, promoting wettability alteration from oil-wet to mixed-wet conditions at concentrations of 1 mg/mL on the limestone outcrop surface. Motivated by these findings, three 2-hydroxy-3-(trimethylammonium)-propyl starch derivatives (HTPS), previously synthesized from corn starch with different cationic degrees of substitution (DS) and molar masses (MM), were evaluated as potential enhanced oil recovery (EOR) agents. Core-flood experiments on carbonate plugs revealed incremental oil recoveries of 6-11% over conventional waterflooding, with higher DS and MM enhancing oil displacement efficiency through improved carbonate wettability alteration and sweep efficiency. To provide molecular-level evidence for the oil recovery mechanisms, the original crude oil and recovered oils from core-flood tests were analyzed by ultrahigh-resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI(±) FT-ICR MS). The compositional analysis demonstrated significant changes in acidic and basic polar compounds, particularly within nitrogen- and oxygen-containing classes, suggesting selective adsorption and fractionation processes at the rock-fluid interface. These findings highlight ESI(±) FT-ICR MS as a key analytical tool linking macroscopic recovery performance with molecular-level fractionation in the recovered oil, thus validating the mechanisms behind the enhanced oil recovery observed in carbonate cores.
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