A successful post-test evaluation well was drilled in the Sloss Field, Kimball County, Nebraska, following a micellar-polymer flood. Drilling and sampling procedures are discussed which help insure valid data. Sulfonate loss, adsorption plus partitioning, was determined to be 0.4 of a pound per barrel (1.1 Kg/m3) of pore space. From core analysis and logging survey, oil was displaced over the entire pay interval from the average post waterflood residual of 30%, although some of the lower permeability zones had a final oil saturation of up to 16% compared to the average of 8%. The polyacrylamide polymer used in the mobility control bank was severely degraded causing the loss of mobility control. The degradation was not caused by a simple thermally induced hydrolysis. Limited tests indicate well workover fluids may have contributed to the degradation.

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