Mechanical Response of Castlegate Sandstone under Hydrostatic Cyclic Loading

Table 2

Testing conditions for each hydrostatic loading test. Tests with multiple pressure conditions indicate maximum and minimum pressure of each cycle.  = confining pressure;  = pore pressure;  = effective pressure during cycles;  = effective pressure during permeability tests. When two values of , , , or are listed, this represents the maximum and minimum pressure of each cycle.

Sample number	(MPa)	(MPa)	(MPa)	(MPa)	Cycle time (hours)	# of cycles	Duration (days)
CG_001	20.68	10.34 & 6.89	10.34 & 13.79	0.55	8	5	2
CG_003	20.68	10.34 & 6.89	10.34 & 13.79	0.55	8	28	10
CG_004	20.68	10.34 & 6.89	10.34 & 13.79	10.17 & 6.72	8	44	16
CG_005	20.68	11.03 & 6.20	9.65 & 14.48	10.89 & 6.07	8	60	23
CG_006	20.68	11.03 & 6.20	9.65 & 14.48	10.76 & 5.93	4	168	32
CG_007	14.82 & 10	0.35	9.65 & 14.47	14.48 & 9.65	4	117	22
CG_009	20.68	10.34	10.34	10.27	—	—	31
CG_010	20.68	10.34 & 6.20	10.34 & 14.48	10.34	2	274	33