The reinjection of produced water is an important prerequisite for maintaining pressure and for flooding reservoirs. Thirty years ago Barkman and Davidson introduced the first compre-hensive theory for predicting the behaviour of injection wells. This theory was employed and tested for many years in actual injection projects at 'Preussag-Energie', including the develop-ment of a special-purpose instrument. In the present article, a survey of operational experience is given, and necessary ex-tensions of the model are delineated. Furthermore, the article highlights some important aspects which should be considered in laboratory investigations.

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