A Study of Infill Pattern in the Later Period at High Water Cut Stage to the Main Reservoir in the Central Portion of the Saertu Pool

The main reservoir of the Daqing field, the PI reservoir, was evaluated after total water cut had increased to about 90%. The location of high residual oil saturation was correlated with the depositional environment. Recompletion and redevelopment plans were formulated for each lithology. Wells were selectively perforated and additional infill wells were drilled. Finally, a polymer flood was initiated. It was concluded that the reservoir should be perforated twice to increase the volume swept by waterflood before injecting polymer.