number

A solution

B solution

permeability after plugging/μm2

plugging rate/%

1

cationic polymer

cationic polymer

0.49

80.52

2

anionic polymer

anionic polymer

2.23

10.59

3

cationic polymer

anionic polymer

0.19

92.15

4

anionic polymer

cationic polymer

0.25

89.92