... stress envelope failure envelope ARMA 23 0934 Replicating S-Shaped Composite Strength Response Using Bonded-Block Modelling: Capturing Dual Nature of Extensional Versus Shear Fracturing of Brittle Rock Mass Farahmand, Kiarash Queen s University, Kingston, Ontario, Canada/Piteau Associates Ltd...

... stress reservoir characterization strength shear strength metals & mining rock discontinuity displacement geologist geology rock type reservoir geomechanics geological subdiscipline frictional angle fracture roughness failure envelope stiffness direct shear test displacement curve...

... upstream oil & gas termination point initial stage sst reservoir geomechanics multistage triaxial testing mpa mst pagoulato identification reservoir characterization experimental investigation friction angle ppd volumetric strain failure envelope poisson deflection point...

... is not possible with single stage tests and represents an advantage of using automated multistage testing. The test results are then used to investigate the scope for optimization of the Hoek-Brown failure envelope at low confinement commensurate with open pits. In addition, the results are used to investigate...

... Reservoir Characterization strength Upstream Oil & Gas reservoir geomechanics metals & mining bmac framework likelihood envelope simmons moisture condition failure envelope clast strength clast test data shear strength envelope liquid limit category strength parameter...

... the discontinuity during sliding. Upstream Oil & Gas normal load dilation strength Reservoir Characterization normal stress displacement discontinuity test result failure envelope shear strength cn testing reservoir geomechanics concrete specimen cnl failure envelope envelope reclamation...

... ABSTRACT: This paper compared various unloading criteria used in multi-stage triaxial tests for determining the Mohr-Coulomb failure envelope. Results from single-stage triaxial tests formed the baseline for comparison. Three types of rock outcrop were used: Berea sandstone, Eagle Ford shale...

... ABSTRACT: A series of triaxial compression tests on rock core plugs, accomplished at successively higher confining pressures, is generally used to create the shear failure envelope, frictional angle, and cohesion for a given rock type. In cases where limited core material is available, one...

...-stage testing under applied normal stresses of 250 kPa, 500 kPa or 1000 kPa. In general, the failure envelopes obtained tended to flatten with increasing degree of scalping (i.e., reducing maximum particle size). Both the inferred friction angle and the apparent cohesion tended to decrease...

... criteria Rock mechanics low mean stress region reservoir geomechanics criterion international journal failure envelope uniaxial tensile strength Upstream Oil & Gas criteria specimen fracture tensile strength strength tension cutoff Dunnville sandstone principal stress 1. INTRODUCTION...

... a linear failure envelope using a single sample. We measured the tensile strength using a separate suite of samples for Brazilian tensile testing. Our findings suggest a reduction of compressive and tensile rock strength by up to 40% and 45%, respectively in fluid saturated rocks; the magnitude...

... Oil & Gas helium failure envelope stress path coalbed methane biot-like coefficient experiment MPa effective horizontal stress reservoir geomechanics complex reservoir adsorption stress coefficient total horizontal stress permeability equation 1. INTRODUCTION US coalbed methane...

... ultrasonic monitoring can be used to detect the advancement of the fluid front within the rock pore space. Introduction To assess water-weakening effects in reservoir rocks, previous experimental studies have focused on changes in the failure envelopes derived from mechanical tests conducted on rocks...

... veined rock masses. Reservoir Characterization stope back boundary condition failure envelope strength size distribution veined rock mass Upstream Oil & Gas block contact rock mass strength veined rock mass sample fragmentation reservoir geomechanics heterogeneity subcontact rock...

... failure are sub-parallel to the failure envelope except in the highest pressure regime. Damage induced at one effective pressure has a systematic, but variable effect on failure at other effective pressure conditions. The behavior across the transition from dilation to compaction is most consistent...

... machine learning Upstream Oil & Gas correlation reservoir geomechanics rockmass Reservoir Characterization strength variability excavation unsatisfactory performance three-sigma approach reliability plastic zone radius reliability analysis hoek-brown failure envelope...

... fractures or joints. Besides its intrinsic capability to model fracture initiation and propagation starting from simple interaction laws, the model can simulate brittle behavior characterized by high values of UCS/TS ratio associated with non-linear failure envelopes, as observed for stiff rocks...

... results were used as inputs to the field development plan. Upstream Oil & Gas reservoir pressure fe model wellbore Modeling & Simulation volumetric strain failure envelope grid Reservoir Characterization Reservoir Compaction rock property matterhorn field reservoir reservoir...

...-Coulomb failure envelopes for the reservoir rock are based on the average strength (c=7 MPa, =28°) and the lower bound shear strength estimates (c=2 MPa, =25 The Mohr-Coulomb failure envelopes for the caprock are based on the measured lab data (c=27 MPa, =28°) and the lower bound shear strength...

... failure envelope loading stage inflection point MPa Mohr triaxial testing result mechanical property rock failure parameter 1. INTRODUCTION Rock mechanical properties like Young s modulus and Poisson s ratio, along with a rock failure criterion are essential for any wellbore stability, sand...