A Synergy between Controlled Salinity Brine and Biosurfactant Flooding for Improved Oil Recovery: An Experimental Investigation Based on Zeta Potential and Interfacial Tension Measurements

Figure 3

Spontaneous imbibition investigations: (a) core sample C23 in formation brine [FMB]; (b) core sample C24 in controlled salinity brine [CSB]; (c) core sample C25 in controlled salinity biosurfactant with greenzyme [CSBSB-G]; (d) core sample C28 in controlled salinity biosurfactant brine with rhamnolipids [CSBSB-R]; (e) observed changes in CSBSB-R system after about 25 days of imbibition; (f) sample of oil produced during FMB imbibition; (g) sample of oil produced during CSB imbibition; (h) sample of oil produced during CSBSB-G imbibition; (i) sample of oil produced during CSBSB-R imbibition.

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