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

Table 3

The incremental oil recovery results of polymer flooding and polymer-viscosity reducing surfactant flooding.

Chemical slug	Sand packs	Water flooding recovery (%)	Chemical flooding and subsequent water flooding recovery (%)	Incremental oil recovery (%)
0.15% P	High permeability	60.5	77.0	16.5
	Low permeability	9.6	20.8	11.2
	Total	37.4	51.5	14.1
0.15% P+0.4% D1	High permeability	57.3	75.7	18.4
	Low permeability	12.3	31.8	19.5
	Total	37.3	56.2	18.9
0.15% P+0.4% A1	High permeability	60.5	79.6	19.1
	Low permeability	11.2	34.7	23.5
	Total	37.9	59.1	21.2