Several reservoir units in the oil fields of a North German sediment basin have been polymer-flooded since 1975. Although the reservoir brine of these units has a relatively high- original salinity, polyacrylamide solutions prepared in fresh water have been injected for enhanced recovery.

After the inplacement of the required polymer slugs, these units have been water flooded for several years and thus have a complete displacement performance history.

The producers included in these floods show distinct oil banks. The production profiles, with water cut, salinity development, and polymer concentration demonstrate the relationship between oil bank and various reservoir and project parameters.

After a brief description of different flood concepts applied during project implementation, this paper will discuss the displacement efficiency of a typical polymer flood. Well-by-well analyses of production performance confirm some basic principles of the polymer flood process

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