Improved Reservoir Characterization and IOR Program to Extend the Life Cycle the Mature Field

A decision on field re-development scenario is usually based on extensive volume of seismic, logs and<br>core data. In our paper we study the case of a mature field in the Volga river basin, where the amount of<br>available geological information was limited.<br>The Vorobiev horizon of Devonien formation at this field in Saratov region is in production since 1954.<br>During the 1992-2001 period ten new production wells were drilled. New well data allowed to improve<br>reservoir characterization, update structural maps, establish new geological models and revise the<br>remaining oil reserves. The new models helped to locate the remaining oil reserves in the structural flanks.<br>The re-development program with drilling of infill and side track horizontal lateral wells together with<br>well stimulation methods is proposed. If the proposed measures are implemented, the oil recovery at this<br>field could be increased by 10-11% to achieve more than 77% of STOOIP.