Waterflooding as a means of secondary recovery is one of the oldest techniques used in the petroleum industry. The design and development of the waterflood usually attracts the most attention and surveillance is a relatively less rigorously followed practice, although its importance in the waterflood's success cannot be understated. There are many techniques for monitoring a water injection/waterflood project. Estimation of flood front with Streamline modeling is a simple and powerful method to understand the injected water movement as it offers a direct visualization technique to map the flood front. This understanding is also at par/ supplementary to finite difference Simulation in mostof the cases.

This paper describes a field example of estimation of flood front movement in a mature oil field using in-house developed Streamline modeling based on which infill drilling was optimized and fresh areas were identified for new inputs which added economic value to the Asset.

The case study brings out the technique's effectiveness as a simple, low cost, quick look tool of Reservoir Surveillance in waterflooding and how it can be used in such cases.

Based on the results presented herein, it is concluded that such innovative methods for quick decision making including economic aspects can make the difference while selecting surveillance methodology.

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