Experiment

Core

Chemicals and Materials

Determination of breakthrough pressure gradient

sand pack (sectional area, 4.9 cm2; length, 20 cm).

polymer, quartz sand (60 - 80 mesh size), chromium crosslinking agent, constant flux pump, core holder, precise pressure gauge, et al.

Determination of recovery increment

Two cylindrical cores (sectional area, 4.9 cm2; length, 9.8 cm). The water permeability of cores is 500 × 10−3 μm2, and 2000 × 10−3 μm2

polymer, constant flux pump, core holder, pressure sensor (Haian County Petroleum Science and Technology Co., Ltd., Haian, China), precise pressure gauge (Haian County Petroleum Science and Technology Co., Ltd., Haian, China), graduate (Haian County Petroleum Science and Technology Co., Ltd., Haian, China), cylinder (Haian County Petroleum Science and Technology Co., Ltd., Haian, China), oil tank (Haian County Petroleum Science and Technology Co., Ltd., Haian, China), et al.