In this article we discuss mechanisms of stress-induced wellbore damage, concentrating on the drilling phase. Damage is usually considered to be negative; we argue that yield and mechanical damage are often positive factors in stabilizing boreholes and in enhancing permeability. Various behavioral models for rock under different situations are discussed, and conceptual models of damage and stresses around boreholes are presented. Finally, we discuss briefly issues of borehole stability in high stress fields during production, with respect to solids production management.

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