Stress-induced wellbore failures are ubiquitous in wells drilled for exploration and production. Through use of wellbore imaging and other logging techniques, stressinduced compressive failure and tensile failure of the wellbore wall can be detected and shear failure (i.e., slip along preexisting shear faults) can be identified. We present new techniques that exploit wellbore image data and enable the determination of the complete stress tensor and the constraint of in-situ rock strength in vertical and inclined wells. We illustrate how to apply this knowledge to limit wellbore instability, design optimally stable wellbores, develop constraints that help mitigate problems associated with sand production, and optimize productivity of fractured reservoirs.

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