Abstract
Wettability alternation phenomena is considered one of the most important enhanced oil recovery (EOR) mechanisms in the chemical flooding process and induced by the adsorption of surfactant on the rock surface. These phenomena are studied by a mesoscopic method named as dissipative particle dynamics (DPD). Both the alteration phenomena of water-wet to oil-wet and that of oil-wet to water-wet are simulated based on reasonable definition of interaction parameters between beads. The wetting hysteresis phenomenon and the process of oil-drops detachment from rock surfaces with different wettability are simulated by adding long-range external forces on the fluid particles. The simulation results show that, the oil drop is liable to spread on the oil-wetting surface and move in the form of liquid film flow, whereas it is likely to move as a whole on the water-wetting surface. There are the same phenomena occuring in wettability-alternated cases. The results also show that DPD method provides a feasible approach to the problems of seepage flow with physicochemical phenomena and can be used to study the mechanism of EOR of chemical flooding.
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The project was supported by the National Basic Research Program of China (973 Program) (2005CB221304).
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Li, X., Liu, Y., Tang, J. et al. Dissipative particle dynamics simulation of wettability alternation phenomena in the chemical flooding process. Acta Mech Sin 25, 583–587 (2009). https://doi.org/10.1007/s10409-009-0247-5
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DOI: https://doi.org/10.1007/s10409-009-0247-5