were linear functions of velocity at any given saturation.Brine dispersion coefficients were This paper examines the changes in fluid distriindistinguishable from those obtained in stable, butions and the mixing that occurs in immiscible single-phase diap?ncementa on the same cG.e. Oil phases flowing in a porous medium with changes in phase dispersion coefficients were, in general, phase saturations and flow rates. We report experi-greater than those for the brine phase, but decreased mental results for steady-state displacements with as oil saturation increased, and at low water saturations established by secondary drainage, for one saturation were the same or less than those for the outcrop and one reservoir sandstone. Displacements brine phase. Mass transfer coefficients were also were performed using immiscible liquids of matched linear functions of displacement velocity and had density and viscosity at six saturatio!:sranging from similar values for both phases. residual oil to low initial water saturation. Flow rates at a given saturation were usual:.yvaried by The differences in displacement resulta between more t' n an order of magnitude.the two core samples are interpreted in terms of pore structure and changes in fluid distribution with Trapped, dendritic and flowing fractions were changes in saturation and flow rate. Finally, we determined for each phase by fitting effluent composidiscuss the implications of the mixing results for tion data to the Coats-Smith model as modified by the performance of EOR processes. Salter and Hohanty.The oil phase and, contrary to previous investigations, the brine phase both exhibited trapped saturations.

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