Based on computer simulation technology, we put forward the shear stress model of nonspherical magnetic particle MRG, and take the hexagon form magnetic particle MRG as an example; this paper deduces hexagon magnetic particle MRG shear stress formula. The model simulate and calculate the relationship between shear yield stress and magnetic field intensity respectively when radius and side length is equal and when the volume is equal also shear yield stress in the zero field condition. The simulation results show that in the same volume condition the shear yield stress of nonspherical magnetic particle MRG is bigger than that of spherical magnetic particle MRG; the shear yield stress of nonspherical magnetic particle MRG cut down with contacting side length’s reducing but also greater than that of spherical magnetic particle MRG and this relationship is also the same in the zero field condition, so spherical magnetic particle MRG is not the best choice. Therefore, this research has an extremely vital significance for the development and application of high-performance MRG.
The addition of nanoparticles (NPs) to polymer solutions can effectively improve the rheological and thermal properties of the polymer solution. However, the interaction between NPs and cellulose, a potential alternative for polymers applied in enhanced oil recovery (EOR), has been scarcely reported. In this work, the effects of three typical NPs (AlOOH, SiO 2 , and ZnO NPs) on the rheological properties, emulsifying ability, and resistance to harsh conditions of carboxylic cellulose nanofiber (CCNF) solutions were investigated thoroughly. The results indicate that only AlOOH NPs exert a positive impact on the CCNF's rheological properties, which should be ascribed to the delicate electrostatic attraction between the CCNF and AlOOH NPs. The intensified network of the CCNF/AlOOH system also results in a superior emulsifying performance and temperature and salt tolerance than other mixed CCNF/NPs systems. In the core flooding test, the CCNF/AlOOH system outperforms the individual CCNF system and the conventional partially hydrolyzed polyacrylamide, reflecting the potential of incorporating AlOOH NPs in the CCNF to promote the CCNF's practical application in EOR.
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