Experimental Study on Optimization of Polymer Preslug Viscosity of ASP Flooding in Interlayer Heterogeneous Well Group Artificial Sandstone Core

Table 3

Experiment scheme for viscosity optimization of polymer preslug.

Name of chemical slug	Slug size; PV	Polymer concentration; mg/L	System viscosity; mPa·s	Alkali concentration; wt%	Surfactant concentration; wt%
Polymer preslug
1	0.093	1900	40	——	——
2	0.075	2360	60	——	——
3	0.064	2775	80	——	——
ASP main slug	0.3	2450	30	1.2	0.3
ASP secondary slug	0.2	2300	30	1.0	0.1
Subsequent polymer slug	0.2	1635	30	——	——