FORM ANALYSIS OF VERTICAL WELLBORE STABILITY


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Variables Distribution Par1 Par2 Par3 Par4
Mud pressure (pm)
Pore pressure (u)
Minimum horizontal stress (σh)
Maximum horizontal stress (σH)
Cohesion (c′)
Tan(Friction angle) (tanφ′)
Variables pm u σh σH c′ tanφ′
pm 1.0
u 1.0
σh 1.0
σH 1.0
c′ 1.0
tanφ′ 1.0

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Normal
Lognormal
Beta
Extreme value
Exponential
Uniform
Triangular
Weibull
Gamma
Pert