Analysis of Wellbore Stability considering the Interaction between Fluid and Shale

Table 2

Calculation parameters.

Type	Variables	Value	Unit
Well parameters	Vertical depth TVD	2380	m
	Inclination angle	90	°
	Inclination azimuth angle	0	°
Formation parameters	Elastic modulus in the isotropic plane	32.75	GPa
	Poisson’s ratio in the isotropic plane	0.14	—
	Elastic modulus of normal direction in the isotropic plane	27.02	GPa
	Poisson’s ratio of normal direction in the isotropic plane	0.21	—
	Shear modulus of normal direction in the isotropic plane	13.14	GPa
	Formation dip direction	0	°
	Formation dip angle	30	°
	Cohesive force of intact rock	45	MPa
	Internal friction angle of intact rock	30	°
	Cohesive force of weak plane	25	MPa
	Internal friction angle of weak plane	20	°
In situ stress parameters	Horizontal maximum in situ stress	63.50	MPa
	Horizontal minimum in situ stress	47.39	MPa
	Overlying crustal stress	58.62	MPa
	Horizontal maximum in situ stress orientation	90	°