Probabilistic Approach in Wellbore Stability Analysis during Drilling

Table 1

Vertical wellbore failure for different stress regimes.

Input	Value
(psi/ft)	1.1
(psi/ft)	1
(psi/ft)	0.9
(psi/ft)	0.46
Cohesion (psi)	870
Friction angle (deg.)	31.3
Poisson’s ratio	0.33