Abstract
ABSTRACT Polymers for low salinity reservoirs and low viscosity crude oils are well known. For sandstone reservoirs with highly concentrated brines of low pH-values, reservoir temperatures up to 80 °C and crude oil viscosities of 20 to 200 mPa⋅s suitable polymers have hitherto not been available. Under consideration of these conditions rapid selection methods for polymers (biopolymers, HEC, PAA/HPAA etc.) were developed. By application of these novel test procedures to about 340 different products several promising polymers, as well as general correlations could be ascertained. Test results concerning the shear stability, filtration, adsorption/retention and flow of polymer solutions in porous media allow reliable predictions about the efficiency of viscous flooding media. Moreover quality and application values of suitable polymers for enhanced oil recovery are critically compared. Preselected polymers were tested in laboratory flooding experiments and have shown substantial increases in oil recovery of up to 24% OOIP.
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