Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability

Table 3

Oil recovery for each experiment at different soaking time.

Sample	Gas permeability (×10^-3μm^2)	Oil saturation (%)	Threshold injection pressure (MPa)	Soaking time (hour)	Oil recovery (%)
Core 3^#	5.3	60.37	20	24	45.1
Core 4^#	4.8	59.96	20	48	47.8
Core 5^#	5.0	60.12	20	72	49.2