Studies on a Foam System of Ultralow Interfacial Tension Applied in Daqing Oilfield after Polymer Flooding

Table 1

Properties of DWS after adsorption in cores.

DWS concentration (%)		0.1	0.2	0.3	0.4	0.5
Surface tension (mN/m)	Original solution	0.0056	0.0045	0.0034	0.0084	0.0112
	After adsorption	0.0078	0.0047	0.0035	0.0032	0.0053
Foam volume (mL)	Original solution	164	163	161	165	165
	After adsorption	156	158	160	161	164
Foam stability (min)	Original solution	30.1	32.1	35.1	36.4	36.1
	After adsorption	35.1	38.5	46.2	48.1	50.2