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<p>Nanoparticle-assisted enhanced oil recovery (EOR) represents a promising approach to improve fluid–rock interactions and mobilize residual hydrocarbons in sandstone reservoirs. In this study, we systematically compare the colloidal stability and wettability alteration performance of silicon dioxide (SiO₂) and aluminum oxide (Al₂O₃) nanofluids formulated in 0.075 wt% CaCl₂ synthetic brine under room temperature, static conditions. Stability was evaluated through 18-day visual sedimentation and quantitative mass-balance analysis. Wettability alteration was quantitatively assessed using the captive bubble method on oil-aged sandstone cores across four nanoparticle concentrations (conc.) (0.01–0.10 wt%). Results show that SiO₂ nanofluids exhibit superior colloidal stability with 18-day sedimentation percentages of 62.2–69.3% across concentrations (0.01–0.10 wt%), compared to 70.0–80.1% for Al₂O₃ representing ~ 13–15% relative improvement. SiO₂ achieved dramatic contact angle reductions from baseline oil-wet state (138–140°) to 28–88° depending on concentration, while Al₂O₃ achieved less pronounced reductions (43–110°). The findings underscore the importance of nanoparticle selection and formulation in optimizing wettability alteration and provide actionable insights for designing effective chemical EOR strategies tailored to reservoir characteristics.</p>

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Comparative stability study of silicon dioxide and aluminum oxide nanofluids on wettability alteration in sandstone cores

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Saptarshi Chetia,
  • Pushpa Sharma

摘要

Nanoparticle-assisted enhanced oil recovery (EOR) represents a promising approach to improve fluid–rock interactions and mobilize residual hydrocarbons in sandstone reservoirs. In this study, we systematically compare the colloidal stability and wettability alteration performance of silicon dioxide (SiO₂) and aluminum oxide (Al₂O₃) nanofluids formulated in 0.075 wt% CaCl₂ synthetic brine under room temperature, static conditions. Stability was evaluated through 18-day visual sedimentation and quantitative mass-balance analysis. Wettability alteration was quantitatively assessed using the captive bubble method on oil-aged sandstone cores across four nanoparticle concentrations (conc.) (0.01–0.10 wt%). Results show that SiO₂ nanofluids exhibit superior colloidal stability with 18-day sedimentation percentages of 62.2–69.3% across concentrations (0.01–0.10 wt%), compared to 70.0–80.1% for Al₂O₃ representing ~ 13–15% relative improvement. SiO₂ achieved dramatic contact angle reductions from baseline oil-wet state (138–140°) to 28–88° depending on concentration, while Al₂O₃ achieved less pronounced reductions (43–110°). The findings underscore the importance of nanoparticle selection and formulation in optimizing wettability alteration and provide actionable insights for designing effective chemical EOR strategies tailored to reservoir characteristics.