Table 3 Experimental results for different EOR processes in three cores.

From: A synergistic approach to enhanced oil recovery by combining in-situ surfactant production and wettability alteration in carbonate reservoirs

Performed scenario

Solution injected

Recovery factor (%)

Ultimate oil recovery

OOIP

Swi

Sor

Secondary flooding

Tertiary flooding

1

2000 mg/L SDS + 4000 mg/L sodium hydroxide

30.2

19

49.2

8.39

0.23

0.387

2

2000 mg/L sodium hydroxide + 1000 mg/L SDS

35.2

13.8

49

6.51

0.22

0.397

3

2000 mg/L SDS + 4000 mg/L sodium carbonate

31.5

12.5

44

8.36

0.24

0.425

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