Abstract
Water flooding reservoirs are susceptible to a number of challenges, including an increase in reservoir heterogeneity and an elevated water content over the course of production. This can significantly diminish crude oil recovery efficiency. In order to address the issue of low water flooding recovery efficiency, a new approach to synthesizing an amphiphilic Janus TiO2 nanoparticle is presented. The Pickering emulsion method, utilizing sucrose stearate (SE-15) as the dispersant, allows the construction of an in-situ emulsified nanofluid (Janus TiO2/SE-15) with a water-in-oil (W/O) type morphology. Zeta potential experiments revealed that the nanofluid exhibited optimal stability when the mass fraction ratio of SE-15 to Janus TiO2 was 2:3. The nanofluid performance study demonstrated that the water-wet contact angle of the core could be reduced from 100° to 88.5° after 2 h of immersion. Moreover, the formation of a water-in-oil emulsion was observed between Janus TiO2/SE-15 and crude oil, with the emulsification viscosity enhancement rate exhibiting the greatest increase at the concentration of Janus TiO2/SE-15 of 0.08%. The results of core drive experiments indicate that the nanofluid drive can effectively increase the injection pressure and expand the wave volume. The results of core drive experiments indicate that nano-fluid drive can effectively increase the injection pressure and expand the wave volume. The final recovery rate of Janus TiO2/SE-15 nano-fluid was 61.77%. The Janus TiO2/SE-15 nanofluid, the subject of this study, is of significant importance for water flooding reservoirs, as it can be employed to enhance recovery.
Published Version
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