... 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...

... 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...

... upstream oil & gas numerical method numerical code hydraulic fracturing uc test failure criterion reservoir characterization fracture pattern cohesive zone model international journal bt test tensile strength reservoir geomechanics engineering simulation mesh finite-discrete...

... 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...

... 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...

... material property strength biaxial test international journal mechanical behaviour Reservoir Characterization stress path volumetric strain Rock mechanics sandstone evolution Hoek failure criterion rothbach sandstone strain localization theory 1. INTRODUCTION To describe the influence...

...1. INTRODUCTION Numerous failure criteria have been used in the past in order to specify the conditions for which the rock failure can occur. Among those failure criteria, the Mohr- Coulomb failure criterion is frequently used to describe the intact rock failure and the rock-on-rock frictional...

... is relatively more complicated because many shear failure criteria can be used and it is not clear which one works the best for cement. Many researchers analyzed the stress distribution around the cement and predict cement shear failure based on a certain failure criterion. Most researchers (Teodoriu et al...

... failure criterion mud weight window Upstream Oil & Gas criterion horizontal stress Drilling Zubair Formation southern iraq rock mechanical property breakout Magnitude 1. INTRODUCTION One of the most critical challenges affecting the drilling and production operations is wellbore...

... designers to assess the combined effect of blasting quality and gravity in the tunnel convergence. Reservoir Characterization failure criterion Symposium rock mass tunnel criterion gravity displacement consideration plastic zone circular tunnel Upstream Oil & Gas convergence...

... 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...

.... The wellbore stresses and rock strength properties obtained from the MEM are then used to calculate the area of collapse based on the Coulomb failure criterion (red area outlined in black in Figure 2; Moos et al., 2007; Zoback, 2010). It is obvious that the magnitudes of the in situ stresses and the rock...

... cement property Upstream Oil & Gas damage mechanics cement chemistry pore pressure Simulation failure criterion cement formulation cyclic loading elasticity modulus cement sheath integrity triaxial compression test Reservoir Characterization casing and cementing criterion...

..., elevated pore pressure and temperature conditions. Reservoir Characterization structural geology pore pressure wellbore integrity osmosis shale deviatoric stress Wellbore Design axial stress stress state reservoir geomechanics Upstream Oil & Gas failure criterion geomechanical...

.... The normal stress and the tangential stress along the weakness plane have corresponding relationships with the slip angle. The Mohr-Coulomb criterion is used the failure criterion. The maximum and minimum slip angle ARMA 18 1256 The Influence of Water-oil Content on the Strength of Sandstone with Weakness...

... that increasing the intermediate principal stress may have an embrittling effect on rock. 1. INTRODUCTION Reservoir Characterization reservoir geomechanics Rock mechanics international journal strength failure criterion plane brittleness Barnett shale criterion rock brittleness rock strength...

... 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...