... stress that led to the development of the measured breakout. Most commonly, Mohr-Coulomb failure criterion is used which disregards the influence of intermediate stress on strength. Different polyaxial criteria have been proposed to include this effect. Here, we first review selected polyaxial criteria...

... of hydraulic stimulation in the slate for the operation of a geothermal power plant. A failure criterion for slate incorporated with a transversely isotropic model was established to describe the behavior of slate. The developed model was validated using a benchmark problem of geothermal techniques under...

...-linear weakening failure criterion that allows irreversible tensile failures. To couple the fracture development and fluid flow inside and outside the fracture, we introduce a method to modify the fracture's neighboring elements by an anisotropic permeability as a function of fracture width. To ensure...

... ABSTRACT An analytical solution is developed for evaluating the stability of an impermeable wellbore in rock formation that obeys Hoek-Brown failure criterion in a hydrostatic stress field. The solution is derived in the framework of the graphical analysis method recently developed by Chen...

... engineering simulation numerical code artificial compliance reservoir characterization fracture pattern cohesive zone model international journal hydraulic fracturing mesh finite-discrete element method bt test tensile strength cohesive element uc test failure criterion fragmentation process...

... and abandonment activities. Mohr-Coulomb Failure Criterion is adopted in studying the risks of plug failure by establishing the circle of stresses exerted on the rock and cement annulus bodies. The result depicts that significant stress and strain changes occur during the well P&A operation that greatly...

... the strength of the rock in neglecting the strengthening effect of the intermediate stress. In this study, the Mogi-Coulomb criterion which is a triaxial failure criterion is used to investigate the wellbore stability analysis. The rock is modeled with a strain hardening plastic material. The wellbore...

... of failure criterion for cement and most of them simply used the Mohr-Coulomb criterion. In this work, comprehensive research is performed to collect published conventional and true triaxial compression strength data of cement. All the accessible data are used to evaluate the accuracy of six different...

... Formation proceedings southern iraq Drilling failure criterion mud weight window rock mechanical property Upstream Oil & Gas criterion horizontal stress breakout Magnitude ARMA 19 241 Safe Mud Weight Window Determination: A Case Study from Southern Iraq Abbas, Ahmed K. Iraqi Drilling...

... Characterization volumetric strain Rock mechanics sandstone evolution Upstream Oil & Gas material property failure criterion rothbach sandstone strain localization theory strength biaxial test international journal Hoek mechanical behaviour stress path ARMA 19 410 Modeling of brittle failure...

... elasticity, or the Lekhnitskii-Amadei anisotropic elasticity solution. Shear failure along the borehole wall can be modeled using two variants of the Jaeger plane of weakness model, using either the Mohr-Coulomb or the Mogi-Coulomb failure criterion for failure along planes other than a bedding plane...

.../volume of collapse failure by using image processing approach is presented. Since image processing can be applied to any result set, the proposed approach is independent of any failure criterion (such as Mohr Coulomb, Mogi-Coulomb and Modified Lade criteria) and very versatile. For hydrocarbon fields...

... will aggravate the damage, especially in the border between different formations. Damage mechanics can give a better way to evaluate cement sheath integrity in the life of a well. cement property Upstream Oil & Gas damage mechanics failure criterion Reservoir Characterization casing and cementing...

..., elevated pore pressure and temperature conditions. Wellbore Design axial stress reservoir geomechanics Upstream Oil & Gas Reservoir Characterization structural geology pore pressure stress state failure criterion MPa shale formation effective stress deviatoric stress experimental...

... angle reservoir geomechanics pore pressure sandstone reduction minimum slip angle Upstream Oil & Gas failure criterion Pore Fluid angle curve Rock Mech anisotropy ARMA 18 1256 The Influence of Water-oil Content on the Strength of Sandstone with Weakness Plane Yuanxun Nie, Guangqing...

... by poroelasticity, thermoelasticity and fracture compression are investigated. With Mohr-Coulomb failure criterion, we calculate the fault reactivation potential around the fracture. Then, two case studies of constant water injection into a hydraulic fracture are presented. This work is of interest...

...) and generalized internal friction angle (equation) is build with the test data. Taking maximum principal strain e as strain softening parameter, (equation) and (equation) were evolved by the piecewise linear functions based on Mohr-Coulomb failure criterion and the friction angle f was deduced in reverse...

... designers to assess the combined effect of blasting quality and gravity in the tunnel convergence. Reservoir Characterization failure criterion Symposium rock mass Upstream Oil & Gas convergence excavation ground response curve displacement criterion gravity determination gravity...

... intermediate principal stress principal stress shale specimen Manco Shale strength failure criterion experiment failure plane Eagleford Shale Barnett shale ARMA 17-255 Strength Criteria for Shale under True-Triaxial Stresses Alex Vachaparampil, Ahmad Ghassemi Reservoir Geomechanics and Seismicity...

... strength failure criterions in describing the process of extensile fracturing (spalling) makes it ideal for modelling damage processes in hard rock pillars. The majority of numerical studies of pillars to date, however, have focused on the application of strain-softening material models; while these models...