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

Table 5

Dynamic imbibition experimental results of different water injection speeds.

Core number	Core permeability (10^-3 μm^2+)	Core length (cm)	Relative wettability index	Imbibition solution	Water injection speed (mL·min^-1)	Final recovery (%)
5-1	1.7	9.9	0.80	Simulated water	0.03	40.6
5-2	1.2	9.8	0.75		0.05	42.8
4-3	1.4	10.0	0.75		0.10	48.6
5-4	1.3	9.6	0.71		0.15	43.1
5-5	1.4	10.0	0.76		0.20	37.4
5-6	1.1	9.7	0.75	Surfactant solution	0.10	52.3