A TOOL FOR ESTIMATING WATER FLOOD PERFORMANCE IN A LAYERED LINEAR RESERVOIR.

ABSTRACT Waterflooding is a method of secondary recovery which is usually performed to increase the recovery of crude oil from the reservoir. It is however necessary to quantify the water before and after breakthrough while predicting the waterflooding performance of the reservoir. More often than not, there are usually challenges associated with water saturation determination prior to waterflooding. Certain complexities may arise in the course of specifying an efficient waterflooding performance model for an homogeneous stratified reservoir. In this study, a mathematical model was developed to establish a relationship between watercut of the flooding stream and water saturation. The model serves as a means for determining the average water saturation after breakthrough. The developed mathematical model was subsequently validated with some range of data points while incorporating stiles method so that the waterflooding performance of the homogeneous reservoir is precisely described with a chart. The developed mathematical model was proven to be consistent and efficient on the part of adequately computing the average water saturation after breakthrough. Moreover, when a permeability distribution and flow capacity chart was included to highlight the effect of reservoir heterogeneity on the water flood performance; it was observed that about two-third of the injected water swept just 20% of the reservoir rock before breakthrough.