Experimental Study on the Distribution of Retained Fracturing Fluids and Its Effect on the Permeability and Wettability in Tight Oil Reservoirs

Table 3

Mixed wettability test results of different core slices.

No.	Before fracturing fluid retention				After fracturing fluid retention
	Hydrophilicity coefficient	Lipophilic coefficient	Mixed wettability	Wettability	Hydrophilicity coefficient	Lipophilic coefficient	Mixed wettability	Wettability
A-1	0.577	0.422	0.154	Weak hydrophilicity	0.572	0.427	0.145	Weak hydrophilicity
A-2	0.574	0.425	0.149	Weak hydrophilicity	0.608	0.391	0.217	Weak hydrophilicity
A-3	0.527	0.472	0.055	Neutral	0.649	0.350	0.299	Weak hydrophilicity
A-4	0.641	0.358	0.283	Weak hydrophilicity	0.655	0.344	0.311	Hydrophilicity
A-5	0.636	0.363	0.273	Weak hydrophilicity	0.639	0.360	0.278	Weak hydrophilicity
B-4	0.634	0.365	0.268	Weak hydrophilicity	0.715	0.284	0.430	Hydrophilicity