The paper considers the experience of huge mature field development optimization by the example of oil Field Y in the Western Siberia.

The approach for automation selection the prospective wells for workover program for the multi-formation field was developed. The automated waterflooding optimization was constructed to increase the sweep efficiency and to balance the injection values by wells. This approach has a significant potential to minimize time expenditures for routine operations, and enables improvement of field development strategies quality.

The field development based on secondary recovery methods like workovers, drilling and waterflooding optimization for the field Y (secondary recovery) allowed increasing recovery factor to some degree. For significant increase of recovery the enhancement oil recovery program (tertiary recovery) was prepared.

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