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• W2945078825 abstract "Modification of oil–brine–minerals interfacial properties with biosurfactant-producing microorganisms and their extracellular metabolites has been considered as one of the viable strategies for microbial enhanced oil recovery (MEOR). In this study, the effect of lipopeptide biosurfactant produced by Bacillus subtilis on the interfacial tension (IFT) and wettability in oil–brine–mineral systems was quantitatively examined by monitoring dodecane–brine IFT and the contact angle of a dodecane–brine–quartz system during cultivation of B. subtilis. The effect of high temperature (35–45 °C) and pressure (∼10 MPa), emulating conditions of in situ reservoir environments, on the effectiveness of the biosurfactant producers was also assessed using a custom-designed high-pressure bioreactor. Within the examined temperature range, it was confirmed that B. subtilis produced the lipopeptide biosurfactant (surfactin) with and without oxygen using nitrate (NO3–) as the alternative electron acceptor. Thereby, the IFT was reduced from ∼50 to ∼10 mN/m and the wettability was modified from the values indicating an intermediate water-wet condition (θ = ∼45–50°) to a strong water-wet condition (θ = ∼20–25°). With the significantly improved capillary factor (γ cos θ) by a factor of 4.4, the two-phase flow simulations using the pore network model estimated significant increases in oil recovery rates in microbially treated reservoirs. The lowest rate and amount of surfactin production were observed at 45 °C, suggesting that higher temperatures may not be favorable for surfactin production by Bacillus spp. These results provide unique quantitative experimental evidence corroborating the feasibility of utilizing biosurfactant-producing microorganisms for MEOR practices targeting reservoirs with high pressure and moderately high temperature." @default.
• W2945078825 created "2019-05-29" @default.
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• W2945078825 date "2019-05-13" @default.
• W2945078825 modified "2023-10-14" @default.
• W2945078825 title "Modification of Interfacial Tension and Wettability in Oil–Brine–Quartz System by in Situ Bacterial Biosurfactant Production at Reservoir Conditions: Implications for Microbial Enhanced Oil Recovery" @default.
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• W2945078825 doi "https://doi.org/10.1021/acs.energyfuels.9b00545" @default.
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