Insights into Enhanced Oil Recovery by Polymer-Viscosity Reducing Surfactant Combination Flooding in Conventional Heavy Oil Reservoir

Table 2

The porosity and permeability of sand packs used for flooding experiments.

Test no.	Chemical slug	Sand packs	Permeability (μm^2)	Porosity (%)
1#	Polymer flooding (P)	High permeability	3.64	42.1
		Low permeability	0.91	35.6
2#	Polymer-viscosity reducing surfactant D1 flooding (P+D1)	High permeability	3.97	41.4
		Low permeability	1.18	36.5
3#	Polymer-viscosity reducing surfactant A1 flooding (P+A1)	High permeability	4.21	41.2
		Low permeability	1.25	38.7