Experimental Investigation of Seepage Mechanism on Oil-Water Two-Phase Displacement in Fractured Tight Reservoir

Table 3

Displacement index under different displacing periods.

Rock samples	Type of experiment	Water content is 95%		Water content is 98%		Final period
		Recovery ratio (%)	Injection volume	Recovery ratio (%)	Injection volume	Recovery ratio (%)	Injection volume
H1-5	Before fractured	41.39	0.90	43.76	1.47	45.60	2.50
	After fractured	31.53	1.12	34.41	1.90	36.69	5.66
H11	Before fractured	39.71	0.82	42.11	1.33	43.69	2.08
	After fractured	30.77	1.00	34.67	2.56	36.84	4.49
H13	Before fractured	38.46	1.77	40.76	2.37	42.72	3.59
	After fractured	31.76	1.88	35.90	3.46	38.63	9.72
H2-12	Before fractured	42.06	0.69	45.26	1.47	47.58	3.64
	After fractured	32.62	1.33	37.28	2.62	40.29	7.17