TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe reinjection of produced water is an important prerequisite for maintaining pressure and for flooding reservoirs. Thirty years ago Barkman and Davidson introduced the first comprehensive 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 development of a special-purpose instrument. In the present article, a survey of operational experience is given, and necessary extensions of the model are delineated. Furthermore, the article highlights some important aspects which should be considered in laboratory investigations.

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