Invasion fluid

Core. No

Core-flooding Experimental data

Invasion/%

Sw2/1

Flowback/%

Qo/ (cc∙min−1)

Nca (×10−5)

Water

Core A

25.82

0.129

50

17.93

10.221

Core B

32.47

0.193

40.63

12.83

7.472

Core C

46.39

0.303

34.78

11.25

6.744

Surfactant

Core D

26.30

0.152

42.31

15.70

188.15

Core E

37.55

0.233

37.84

12.96

161.15

Core F

43.83

0.27

38.64

12.44

148.17