Abstract
Abstract Water channeling through high permeable layers during water flooding results in poor sweep efficiency. There are high costs involved in chemical methods of controlling mobility. Many laboratory studies evidence that injection of water with low salt concentration leads to significant decrease in the core permeability. In this paper the possibility of applying induced fines migration as an enhance oil recovery technique was investigated by modeling of the process. It was shown that the system of equations for water injection with induced formation damage is equivalent to polymer-flooding. It enabled applying polymer option of Eclipse black-oil simulator to model low salinity water flooding with induced formation damage. Investigation of the effect of induced formation damage on sweep efficiency during high salinity and low salinity water flood were the main aims of this study. Eclipse polymer flood model was used to model water injection with induced formation damage in a two layer cake reservoir. Analysis of modeling results showed that induced formation damage was favorable to sweep efficiency. Displacement of oil with low salinity water with induced formation damage resulted in up to 19% extra oil recovery. The sensitivity study showed that improved sweep during low salinity water injection was sensitive to heterogeneity, permeability reduction value, and slug volume. Introducing the permeability dependency of formation damage coefficient reduces IOR effects of induced formation damage during low salinity water flooding if compared with the case of constant formation damage coefficient. Several water flood scenarios with injecting different volume of low salinity water were modeled in order to determine the optimum low salinity slug volume. It was shown that injection of 0.5 PVI of fresh water with high salinity water drive results in similar incremental recovery if compared with continuous injection of low salinity water.
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