Abstract
We report the synthesis of nanosized polystyrene (PSt) microspheres with good uniformity, strong absorptivity, good shear resistance and controllable size. The PSt nanofluid, entitled with a high surface adsorption of nanoparticles, can effectively reduce interfacial tension without using surfactants and alter the wettability towards a more water-wet condition. Subsequently, their fluidic properties for chemical enhanced oil recovery of PSt nanofluidic microspheres were also investigated based upon core flooding experiments, sand-pack and NMR tests. It is found that remaining oil displacement can be realized by regulating the nanofluid behavior, including wettability and interfacial tension. Moreover, deep fluid diversion could be achieved through profile control by plugging pores. All these advantages made the PSt nanofluid to be favorable for oilfield practice.
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