Permeability of the Hydrated Shale under Cyclic Loading and Unloading Conditions

Table 3

Curves of permeability and confined pressure of hydrated shale rocks.

Hydrated days	Cycles	Loading			Unloading
			Fitting curves ( represents permeability ; represents confining pressure )	Relation coefficient		Fitting curves ( represents permeability ; represents confining pressure )	Relation coefficient
0	1	0.9		0.99	0.181		0.99
	2	0.21		0.98	0.089		0.98
	3	0.08		0.97	0.065		0.97
	4	0.065		0.98	0.054		0.98
	5	0.057		0.99	0.051		0.99
2	1	0.91		0.99	0.092		0.99
	2	0.13		0.98	0.071		0.98
	3	0.07		0.97	0.059		0.97
	4	0.056		0.98	0.046		0.98
	5	0.05		0.99	0.044		0.99
5	1	0.924		0.99	0.074		0.9
	2	0.121		0.98	0.071		0.95
	3	0.086		0.97	0.057		0.97
	4	0.066		0.98	0.054		0.98
	5	0.056		0.99	0.05	y^= 11.646x(-1.556)	0.99
10	1	0.95		0.99	0.072		0.99
	2	0.18		0.98	0.067		0.98
	3	0.092		0.97	0.056		0.97
	4	0.061		0.98	0.043		0.98
	5	0.051		0.99	0.042		0.99