Spontaneous Imbibition Experiment and Main Influence Factors in Ultra-Low-Permeability Reservoirs

Table 3

Oil displacement efficiency and maximum contribution rate.

Sample no.	Displacement rate (mL/min)	Spontaneous imbibition displacement efficiency (%)	Displacement efficiency (%)	Maximum contribution rate (%)
Core 3-1	0.02	10.71	12.85	85.80
	0.04	19.59	40.60	49.71
	0.06	49.89	60.38	85.11
Core 3-2	0.02	18.89	22.92	84.77
	0.04	34.59	45.01	79.16
	0.06	13.99	50.52	28.16