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Magnetic Responsive Pickering Emulsion Containing SiO2-Fe3O4 Particles with Highly Selective Water Plugging in
Xiaofeng Xing1, Zhiyin Zhao1, Dongmei Yang1
1College of Chemistry and Chemical Engineering of Southwest Petroleum University, Chengdu 610500, PR China.
Abstract:
The development of selective water-plugging materials is a challenging task in oil field research. A magnetically responsive emulsion containing SiO2-Fe3O4 particles was prepared using the mechanical emulsification method. The stability, magnetic demulsification, and water-plugging performance of the emulsion were evaluated. The results showed that the emulsion with SiO2-Fe3O4 particles could maintain stability for up to 30 days at room temperature. However, when the temperature exceeded 80 °C, the thermal stability decreased with an increase in the SiO2-Fe3O4 ratio. Meanwhile, based on the magnetic response of Fe3O4 particles, the demulsification behavior of the emulsion under a constant magnetic field strength was analyzed, revealing that the stability of the emulsion is jointly determined by the particle membrane and surfactant. Results from the displacement experiments showed that when the water phase plugging rate reached more than 97%, the oil phase plugging rate was only 45%. Mechanism analysis and contact angle characterization verified that the plugging rates for the water and oil phases depend on the cross-linking form of the SiO2-Fe3O4 composite material. Fe3O4 particles "wrapping" around SiO2 particles are beneficial for enhancing water-plugging performance.
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