Insights into Enhanced Oil Recovery by Coupling Branched-Preformed Particle Gel and Viscosity Reducer Flooding in Ordinary Heavy Oil Reservoir

Table 3

Viscosity reduction rate of three viscosity reducers at different shear rates at 70°C.

Chemical slug	Oil-water volume ratio	Shear rate (r·min^-1)	Crude oil viscosity (mPa·s)	Emulsion viscosity (mPa·s)	Viscosity reduction rate (%)
S1	3 : 7	500	2570	272	89.4
S1	3 : 7	1000	2570	187	92.7
S1	3 : 7	3000	2570	46	98.2
S2	3 : 7	500	2570	421	87.6
S2	3 : 7	1000	2570	241	90.6
S2	3 : 7	3000	2570	127	95.1
S3	3 : 7	500	2570	/	/
S3	3 : 7	1000	2570	1110	56.8
S3	3 : 7	3000	2570	318	83.6