Abstract

Oil bypassing is a significant problem in edge-water drive reservoirs. The encroaching water from an active aquifer overruns oil and leaves a significant volume of trapped residual oil behind. This causes pre-mature water production and early well abandonment. The technique to inject small volume of low salinity water into abandoned wells in order to create a low permeable barrier against the water fingers is presented. In addition a method of applying commercial reservoir simulators to model the process is introduced. The modeling results shows that injection of small volume of low salinity water results in increasing reservoir production life and consequently 4.5% incremental recovery if compared to normal depletion. The economic evaluation of the technique resulted in NPV value of +7.84 MM US$ meaning that the technique is viable from economic stand point.

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