ABSTRACT
Collection of production data from centrifuge displacement with a time resolution of seconds and volume resolution of 4 µl provides the precision for interpreting the transient data for the displaced phase relative permeability curve. Interpretation for the relative permeability requires a simulation model that includes all relevant phenomena that affects the displacement. This includes the variation of the centrifugal force within the sample and during the centrifuge start-up period. Capillary pressure is a significant factor in both the initiation and cessation of production and thus must also be included in the analysis. The finite mobility of the invading phase places limitations on the portion of the relative permeability curve that is in the region of the shock. In addition, the finite mobility of the invading phase reduces the sensitivity to the initial (end ppinf) relative permeability of the displaced phase. The design of experiments in mixed wet systems require a balance between the Brownell-Katz (or Bond) number criteria for displacement of a disconnected phase and retention due to a capillary end effect.
