Study on the Key Influential Factors on Water Huff-n-Puff in Ultralow-Permeability Reservoir

Table 2

Experimental results of static spontaneous imbibition under different wettabilities.

Core number	Core basic information
	Core permeability (10^-3 μm^2)	Contact angle (°)	Relative wettability index	Core wettability	Core length (cm)	Imbibition solution	Imbibition recovery (%)
1-1	1.2	143	-0.62	Oil-wet	5.3	Simulated water	13.9
1-2	1.1	84	0.10	Intermediate-wet	5.5		22.1
1-3	0.9	48	0.79	Water-wet	5.2		31.3