Application of flow-diversion technologies to increase oil recovery at the Uzen field

Abstract

Polymer flooding is a highly effective method of physical and chemical intervention in productive reservoirs. The primary characteristic of polymers is their ability to thicken water, which reduces the viscosity ratio between oil and water in the formation and diminishes water breakthrough conditions caused by viscosity differences or reservoir heterogeneity. Additionally, due to their increased viscosity, polymer solutions can more effectively displace both oil and bound reservoir water from the porous medium. They interact with the porous medium’s framework, including the rock and the cementing substance, leading to the adsorption of polymer molecules onto the surface of the porous medium. This adsorption blocks the channels or hinders water filtration within them. The extent of adsorption is significantly influenced by water mineralization and the rock’s mineral composition, necessitating the creation of a fringe from fresh water to reduce adsorption. Despite this, the positive aspect of adsorption in water-washed formations is evident, as it decreases permeability and aligns the pickup profile, which is particularly beneficial for conditions like those in the Uzen deposit. The article presents an analysis of the effectiveness of Flooding Displacement Technology (FDT) in this context.