| Περίληψη: | Considering the increasing demand for energy, worldwide, and the depletion of oil and natural gas resources, it is important to exploit and increase oil production from exploited reservoirs by introducing new technologies for Enhanced Oil Recovery (EOR). EOR includes processes such as chemical EOR, thermal EOR, gas injection and other methods. Surfactants, polymers, alkaline solutions and nanoparticles have an important role in chemical EOR. In the present work, the surface and interfacial tension of various suspensions of the hydrophobic anionic copolymer P(AMPSAx-co-AAy-DMAz) and polymer-coated nanoparticles (PNPs) were measured, at different concentrations with and without salts (NaCl, MgSO4), by using the dynamic pendant drop method and Du Nouy ring method on tensiometer. The measurements were made to simulate the brine that commonly coexists with the oil. Also, from the contact angle measurements of the suspensions, on a glass and PMMA surface, wetting phenomena (spreading) were studied. The particle diameter distribution of the suspensions and their stability were studied with the dynamic light scattering (DLS) instrument. From the results of the measurements and accounting for the reduction of the dynamic interfacial tension (with n-dodecane), stable emulsions (Pickering emulsions) were prepared. The stability of the emulsions was observed macroscopically (visual observation) and microscopically (optical microscope) and their rheological properties were studied. The most stable PNP-based fluids were tested as agents of enhanced oil recovery by immiscible displacements tests in a glass - etched pore network. Oil displacement performance was used as a criterion to evaluate the performance of PNP-based fluids as EOR agents.
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