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• W2029559118 abstract "Standard oil/brine spontaneous imbibition experiments are usually performed using cylindrical core plugs with the All-Faces-Open (AFO) or One-End-Open (OEO) sample geometries. The resulting oil production varies approximately with the square root of time. Thus only a single factor (made up of a group of unknowns including relative permeabilities) can be determined. If the sample geometry is changed to Two Ends Open (TEO), oil production can be measured separately from each end face and both counter-current and co-current flows occur in the same experiment. Specifically, using the TEO-free imbibition geometry, with one end contacting the brine and the other end kept in contact with bulk oil at the same pressure, oil is initially produced counter-currently (and rapidly) at the brine face but this soon declines. Oil is then only produced co-currently at the oil end of the core and, depending on circumstances, its rate can increase or decrease with time. The split between co-current and counter-current production, and the two productions rates depends primarily on the oil/brine viscosity ratio. If the pressure is measured during imbibition, the relative permeabilities may be estimated. A theory has been developed based on the approximation of piston like displacement. Experimental results, using positron emission tomography (PET) to image the in-situ spatial development in the waterfront during imbibition, show that this approximation is reasonable. The model is used to estimate parameters such as relative permeability and capillary pressure from spontaneous imbibition, vital inputs in numerical simulations and often measured in time-consuming standard steady-state methods. The experimental data is used to verify the proposed theory and demonstrate the significance of the capillary back pressure at the brine face, a parameter not often included in standard analysis. In particular, it can be seen that the ratio of the non-wetting and wetting phase relative permeabilities behind the front depends on the oil/brine viscosity ratio." @default.
• W2029559118 created "2016-06-24" @default.
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• W2029559118 date "2015-04-14" @default.
• W2029559118 modified "2023-09-26" @default.
• W2029559118 title "Spontaneous Imbibition Revisited - A New Method to Determine Kr and Pc by Inclusion of the Capillary Backpressure" @default.
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• W2029559118 doi "https://doi.org/10.3997/2214-4609.201412131" @default.
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