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• W2182703645 abstract "Initial fluid distribution for heterogeneous reservoirs i.e. layered reservoirs with different permeability and porosity is often modeled by simplified capillary J-function for input to reservoir simulation. Leverett introduced the model in 1941 and showed that dimensionless capillary J (Sw)-function varies only with fluid saturation. However, theories of capillary pressure indicate that Leverett J-function should also be a function of tortuosity, irreducible liquid saturation and pore size distribution. As a result, scaling of capillary pressure by Leverett J-function should be limited to the formations whose pore size distribution and irreducible liquid saturation are equal. The pore size distribution is likely to affect the shape of the drainage capillary pressure (Pc) saturation curve. Therefore if pore size distribution is different in two formations, saturation exponent, a key parameter for the drainage Pc curve is likely to be different. The effect of tortuosity on Jfunction is not pronounced since its value does not change too much. However, if Leverett J-function is used to obtain Pc-saturation functions for different formations whose irreducible liquid saturation and the saturation exponent are different, then significant saturation discrepancy might arise in the scaled Pc-functions. It is also observed that irreducible liquid saturation is a function of specific surface area, wettability and interfacial tension of the rock-fluid system. Therefore scaling of Pc by Leverett J-function may provide incorrect Pc-saturation value at low saturation range even for the similar rocks but whose fluid systems are different. In this paper, we define a modified J-function that includes tortuosity, irreducible liquid saturation and saturation exponent so that the modified J-function may be used for scaling of Pc-saturation functions for any formations. We also propose auxiliary equations for estimating tortuosity, irreducible liquid saturation and saturation exponent from permeability and porosity data that may be used to calculate the modified J-function." @default.
• W2182703645 created "2016-06-24" @default.
• W2182703645 creator A5032455876 @default.
• W2182703645 date "2001-01-01" @default.
• W2182703645 modified "2023-09-27" @default.
• W2182703645 title "MODELING OF CAPILLARY PRESSURE FOR HETEROGENEOUS RESERVOIRS BY A MODIFIED J-FUNCTION" @default.
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