Relationship between the Molecular Coil Dimension and the Energy Storage Modulus of Polymer Solution Configured with Oilfield-Produced Sewage

Table 2

Oil displacement efficiency of the polymer solution with different Dh (M_w = 2500 × 10⁴).

Pore-throat ratio	Cp (g/L)	0.0	0.5	1.5	2.5
	Dh (nm)	—	159.7	301.4	327.8
3.5	ER (%)	54.26	75.28	88.15	97.82
	ER improvement (%)	—	21.02	33.89	43.56
7.0	ER (%)	50.41	52.93	54.31	60.85
	ER improvement (%)	—	2.52	3.9	10.44

E _R improvement = E_R (polymer flooding) − E_R (water flooding).