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 7

Secondary CSB flooding on core C27, (a) cumulative oil recovery and differential pressure; (b) pH and conductivity of effluents; (c) Ca²⁺ and Mg²⁺ analyses of effluents. The straight lines indicate concentration of Ca²⁺ (coloured) and Mg²⁺ (black) in connate water saturation (—) and CSB injected (. . .).

(a)

(b)

(c)