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In a naturally-fractured formation, the maximum mudweight (the lost-circulation pressure gradient) allowed along the interval is distributed between the minimum and maximum in-situ stress gradients. For a vertical wellbore drilled in an extensional stress environment, the spectrum of lost-circulation pressure gradients is dominated by the values close to the maximum (vertical) in-situ stress gradient. For a vertical wellbore drilled in an compressional stress environment, the spectrum of lost-circulation pressure gradients is dominated by the values close to the minimum (vertical) in-situ stress gradient. The minimum required length of the open-hole testing section increases with the length of the interval to be drilled, but there is no clear dependence of the minimum required length on the fracture density.

From Fracture Gradient to Spectrum of Lost-circulation Pressures: A Paradigm Shift?