The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing

Table 3

Regression coefficients of the factors influencing shale porosity.

Model	Non-normalized coefficient		Normalized coefficient
		Standard error	Beta	t	Significance
(Constant)	0.417	0.216		1.931	0.066
Shut-in time	-0.057	0.153	-0.078	0.372	0.713
Backflow outlet pressure	-0.012	0.017	-0.141	-0.688	0.498
Differential pressure during backflow	-0.066	0.058	-0.232	-1.142	0.266