The quality of injection waters used in any new or existing waterflood or EOR ·process should be considered as a critical component of reservoir management and surveillance programs. Despite decades of industry experience with recovery processes utilizing water in the Permian Basin (and most other major oil producing basins of the world), water quality is an often neglected aspect of reservoir management programs. Consequently, severe injectivity and operational problems are frequently experienced.

This paper describes a case study of water quality control for the Clearfork and Glorieta reservoirs (Permian age) of the North Robertson Unit (NRU) located in the Permian Basin of West Texas. A cost-effective surveillance program for the timely identification and treatment of potential water quality control problems has been designed and implemented. Integration of geological and reservoir parameters, which are crucial to ensure the realization of optimal reservoir performance and operational objectives, is highlighted.

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