Unlocking Hidden Opportunity in Tango Formation: Significant Incremental Recovery Through Practical Application of Reservoir Management and Characterization

Abstrak

Field Bravo started production in 1972 and has been maturing and declining over the last few decades. Most of production comes from the Delta formation currently under the waterflood, with several areas of additional production coming from Tango  reservoirs, commonly under primary recovery mechanism.

Waterflood optimization efforts were done to arrest aging field decline, while at the same time looking for production  improvement opportunities in non-waterflooded reservoirs. This paper presents a success story in unlocking a hidden opportunity found in the T reservoir through production history and surveillance data revisit.

The use of comprehensive production history and surveillance analysis provided an integrated review to investigate reservoir performance and to develop most appropriate reservoir optimization strategy.

One key success factor in the application of this strategy was to perform an analysis by utilizing specific mapping methodology to capture the size of opportunity combined with pressure analysis and historical sand production allocation. Further reservoir management strategy was developed from reservoir characterization using basic production data (water-cut), high resolution stratigraphic analysis, y-plot analysis, and capacitance-resistance modeling. The result of the approach is significant incremental recovery from a reservoir that has had already recovered high volumes of oil since its production.