Stochastic Optimization of In Situ Horizontal Stress Magnitudes Using Probabilistic Model of Rock Failure at Wellbore Breakout Margin

Constraining the relationship between the borehole breakout width and rock compressive strength in a vertical borehole is fundamental for determining the magnitudes of the principal in situ horizontal stresses. However, the deterministic relationship yields indeterminate solutions for the two unknown stresses. This paper describes a new method incorporating probabilistic distributions of rock strength and breakout width in a vertical wellbore...