Abstract

ABSTRACT A method for the simultaneous determination of capillary pressure and relative permeability curves of oil/water systems from coreflood experiments is presented. The Levenberg-Marquardt optimization technique is used to match results from a numerical simulator to laboratory coreflood data by applying a nonlinear least-squares procedure. The simulator is an IMPES finite-difference program which models the simultaneous one-dimensional flow of oil and water through a core. Exponentional functions are used to describe relative permeabilities and capillary pressure curves. Results show that relative permeabilities can be in error when capillary pressure terms are neglected and that the adjustment of a variable which combines oil and total flow rate output data leads to better matches than the adjustment of cumulative oil recovery.

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