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Percolation behavior of two typical non-Newtonian oil displacement agents
ZHANG Li-juan, YUE Xiang-an
(MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249 9 China)
Abstract:
According to pore throat as the basic flow cell of real porous media in reservoir and pore size stochastic distribution, the microscale model of porous media was simplified as 2D stochastic channel bundle with cross section variation. The flow behaviors of viscoelastic and power law oil displacement agents in pore throat model and microscale model of porous media were studied by numerical method. The results show that for viscoelastic oil displacement agent,the viscoelastic effect is obvious and seepage resistance increases markedly with viscoelastic property increasing when flow rate reaches a critical value. The seepage resistance increases with the decrease of heterogeneity and mean pore size of porous media. For power law one, the effects of flow rate,heterogeneity and mean pore siz^ of porous media on the seepage resistance are similar to that on viscoelastic oil displacement agent. However, the seepage resistance of power law oil displacement agent is far less than that of viscoelastic one and decreases with the non-Newtonian property increasing. By comparison of three kinds of oil displacement agents flowing through cores and through 2D stochastic channel bundle, it is found that 2D stochastic channel bundle can be used as simple model of porous media,which overcomes multi-factor synthetic effects and can illustrate the effect of one factor such as rheolog-ical property,pore size and heterogeneity on the percolation behavior of oil displacement agent.
Key words:  seepage resistance  oil displacement agent  micro-channel bundle  viscoelastic fluid  power law fluid  polymer flooding