An Estimating Method of Fraction of Reinjected Water to Produced Fluid on the Basis of a Lumped Parameter Model

Abstract

We proposed a method for estimating mixing ratio(or fraction) of reinjected water to produced fluid on the basis of a reservoir model developed by Malate and OÆSullivan(l991). A lumped parameter model for the masses of fluid and chloride(C1) was used for a reservoir system consisting reinjection and production zones. The method employs on-line analysis algorithm and estimates an optimum value of the fraction at each moment of C1 concentration measurement of the produced fluid. Field data from Palinpinon in the literature were analyzed with the present method. The results showed good estimates of the fraction were obtained during the early period of C1 concentration measurement.