Fig. 21

Microscopic images showing the limited diversion of water into the matrix at the end of tertiary injection of 2xcSW + 1000ppm HPAM, in spite of the fact that pores remained oil-wet.

Microscopic images showing the limited diversion of water into the matrix at the end of tertiary injection of 2xcSW + 1000ppm HPAM, in spite of the fact that pores remained oil-wet.