... at the site. Instead, we demonstrate borehole wall failure by shear. By employing the Coulomb criterion, a probable stress distribution with depth is derived. 1 INTRODUCTION The hydraulic fracturing methodology has had a vast application worldwide since it was first introduced in the 1960-ies (e.g...

... breakout span as it varies with depth is obtained. Laboratory tests of core samples in a polyaxial cell render the true triaxial strength criterion of the rock. Using the condition of limit equilibrium between the local state of stress at the edges of breakout-borehole wall intersections and the strength...

... is required. In this latter case a multitude of ambiguities arise to the point that analysis of breakdown pressure for in situ stress estimation is often considered unreliable. wellbore integrity hydraulic fracturing compressibility Reservoir Characterization Wellbore Design criterion Detournay...

... in-situ stress regime project site Upstream Oil & Gas criterion in-situ stress measurement principal stress contour principal stress basket shape Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Influence of high horizontal stress regime...