EXPERIMENTAL STUDY OF OIL RECOVERY BY LOW SALINITY WATER FLOODING

Abstract

Several laboratory indicated that oil recovery in water flooding is dependent on the salinity of the injected water, that low salinity water injectioncan improve oil recovery. Low salinity brine is a promising method for improving oil recovery in sandstone reservoirs. Several mechanisms have known to be responsible for improving recovery by low salinity water flooding. This project presents laboratory results and analysis of core flood studies of lab oil (iso bar-l) for understanding how low salinity brine affects in the final recovery. An experiment was done in tertiary recovery mode. In an experimental procedure high salinity brineinjected firstly to reach a high water cut value and all oil produced almost depleted, then injection of low salinity brine. Oil recovery by high salinity water injection equals 3.5 cc at water cut 95% and by low salinity water injection equals 0.8 ccat water cut 85% .The results showed that oil recovery increasing when we injected low salinity after injected high salinity brine