This paper presents the revitalization plan of two long producing fields located in the Campos Basin, offshore Brazil. Both produce from high OOIP, complex albian carbonate reservoirs. The fields started producing in the early 1980's and their exploitation strategies were mainly based on vertical and deviated wells. No secondary recovery process was initially adopted. Both reservoirs exhibit low average permeabilities (less than 10 millidarcies) and high heterogeneity. In Albian-B, vertical heterogeneity has led to uneven reservoir depletion. From the drilling of recent wells, stratigraphic layers with better properties have been found to be severely depleted. Albian-E exhibits remarkable areal contrasts. The northern part of the reservoir is extremely tight while the southern is naturally fractured.

Currently, the production performance of both reservoirs creates the opportunity of increasing their ultimate recovery factor. In 2009, a pilot project aimed at appraising water injection toke place. The project scope was defined by a pair producer-injector, both horizontal multi-fractured. Through the monitoring of the two wells the displacement efficiency has being characterized in Albian-B reservoir. This information has guided the revitalization plan of the reservoirs. New drainage strategies were defined with help of assisted optimization. The studies pointed out attractive revitalization scenarios with a new platform to produce both reservoirs.

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