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

Table 2

Oil displacement efficiency and increase range of core 3-1 and 3-2.

	Core 3-1					Core 3-2
Imbibition time	0 h	5 h	24 h	48 h	168 h	0 h	5 h	24 h	48 h	168 h
Oil displacement efficiency (%)	0.00	0.60	2.27	3.58	18.35	0.00	5.94	8.33	12.47	33.68
Increase range (%)	2.00	0.60	1.69	1.32	14.74	0.00	5.92	2.39	4.16	21.31