Wellbore Stability of a Deep-Water Shallow Hydrate Reservoir Based on Strain Softening Characteristics

Table 2

Parameter values used in the analysis of influencing factors.

Parameter	Case 1	Case 2	Case 3
Depth (mbsf)	200	400	600
Maximum horizontal ground stress (MPa)	15.76	21.52	27.28
Minimum horizontal ground stress (MPa)	14.33	19.56	24.80
Vertical ground stress (MPa)	19.70	26.90	34.10
Mud pressure (MPa)	14.77	17.03	19.30
Pore pressure (MPa)	14.50	16.50	18.50
Maximum horizontal effective ground stress (MPa)	1.26	5.02	8.78
Minimum horizontal effective ground stress (MPa)	-0.17	3.06	6.30
Vertical effective ground stress (MPa)	5.20	10.40	15.60
Borehole support stress (MPa)	0.27	0.53	0.80