Determination of the Hydration Damage Instability Period in a Shale Borehole Wall and Its Application to a Fuling Shale Gas Reservoir in China

Table 2

Changing relationship of damage variable, soaking time, and water content of shale.

Group	Soaking time (h)	Water content (%)	Damage variable
1	0	3.51	0.005
2	24	5.59	0.071
3	36	6.17	0.128
4	48	6.39	0.174
5	72	6.63	0.231
6	336	7.52	0.452
7	454	7.84	0.531
8	526	8.15	0.594
9	672	8.54	0.692
10	744	9.00	0.756
11	986	9.00	0.901
12	1200	9.00	0.904