... lateral stress ratio ( K 0 ) is 0.75 for the resedimented material and 0.62 for the intact material. The intact material behaves over-consolidated because its in situ state (7.9 MPa) is less than the yield stress (∼20 MPa). The compressibility of the resedimented specimen is an order of magnitude higher...

... studying seismicity at laboratory scale (Lockner, 1993). berea sandstone cumulative ae event specimen shear stress upstream oil & gas acoustic emission pore fluid strain compression experiment reservoir characterization pore pressure sandstone compression experiment stress ratio...

.... Tectonic geomechanical modeling using boundary element method was subsequently used to obtain the 3D in-situ stress field distribution with the maximum horizontal stress calculated based on the stress ratio from the tectonic model. The generated minimum horizontal stress was calibrated with diagnostic...

... model concludes that the elastic properties of the material modelled does not have a great impact on the final results. On the other hand, the presence of salt structures and the seafloor geometry are the key features that drive the stress changes in these models. stress ratio mechanism...

... MPa stress ratio radial water jet drill diameter differential stress excavation in-situ stress breakout Reservoir Characterization hole-profile geometry nozzle strength borehole stability tangential stress stress field ARMA 19 1951 Numerical modelling of the influence of in-situ...

... developed from recent experimental work on highly smectitic Gulf of Mexico mudrocks. These experimental data demonstrate a friction angle decrease and a uniaxial stress ratio increase with increasing confining stress levels. We find that stress-level dependency predicts a more uniform stress state near salt...

... fracture propagation hydraulic fracture propagation hydraulic fracturing stress ratio cementation interaction map matrix complex reservoir criterion Exhibition application natural fracture absolute stress contrast hydraulic fracture Blanton fracture propagation stress contrast interaction...

..., the technique is known as Microbial Induced Calcium Carbonate precipitation (MICP). Reservoir Characterization stress ratio clay content Upstream Oil & Gas sample preparation method particle specific gravity reservoir sand porosity preparation method sandstone sample clay-rich sandstone...

... seepage borehole breakout reservoir geomechanics stress ratio criteria horizontal stress plastic strain seepage breakout shape permeability change Wellbore Design wellbore breakout mud pressure tangential stress breakout final breakout shape propagation ARMA 16-244 Numerical Modeling...

... a rule governing this type interaction (Rahman, 2009; Fu et al., 2013; Khoei et al., 2015; Grasselli, et al., 2015, for examples) but new fully HM coupled simulations are still useful to understand the interaction processes. complex reservoir stress ratio Reservoir Characterization Upstream Oil...

... solid skeletons based on the hybrid finite element-finite volume method (FEFVM). The magnitude of the equivalent permeability varies significantly with respect to the change of stress ratio. Introduction Natural fractures are ubiquitous in crustal rocks in the form of faults, bedding planes, joints...

... Abstract: As indicated by Thomsen's landmark paper on seismic anisotropy, delta ( d ) can be positive or negative. Because of this, anisotropy may have an additive or subtractive effect on stress ratios, pore-pressure, tectonic stress and anisotropy gradient predictions for seismic based...

... Abstract: In this paper we present results from four laboratory hydraulic fracture experiments were the triaxial stress ratio was varied. This analysis was followed by a numerical modelling study using the distinct element method (XSite). For the four stress states, s 3 was held at 10 MPa...

... stress ratios. A non-linear behavior between normal stress-normal displacements of fractures is adopted so that both scale and stress-dependent normal stiffness of the fractures can be considered. The results show that overall permeability continued to decrease, with the increase of stress ratio, when...

... cracks forming within coal pillars are observed under different conditions, including high stress ratio, laminations, and smaller excavation width. When the yield condition and crack formation are combined, better simulation results can be obtained. 1. INTRODUCTION According to MSHA (2014...

... in the development of hydraulic fracture injection pressures in unconventional reservoirs. hydraulic fracturing stress ratio Upstream Oil & Gas natural fracture injection pressure in-situ pore pressure aperture Simulation net pressure behavior fracture propagation natural fracture aperture...

..., a coupled hydro-mechanical analysis is applied via the Universal Distinct Element Code (UDEC™) software to model both rock and fracture behavior in the HF/NFR system. In the current study, a Voronoi tessellated continuum has been generated to evaluate the effect of the stress ratio on flow into the joints...

... depth, approximately 140m below ground surface. The stress ratios which correctly captured the observed notch were determined to be a K o =4.0 and K Hh =1.4. Using the same calibrated approach, average laboratory test results, a series of models were computed over the range of stress conditions...

... of deviatoric stress state. Reservoir Characterization strength deviatoric stress state true triaxial test reservoir geomechanics dilatancy Mean stress sandstone MPa Upstream Oil & Gas novel loading path loading path Bentheim sandstone axisymmetric compression stress ratio axisymmetric...

... dimension numerical simulation stress anisotropy stress ratio Simulation experiment geometry numerical model lateral stress laboratory experiment borehole wall Magnitude ARMA 12-373 Numerical simulations of sanding under different stress regimes Younessi, A. and Rasouli, V. Curtin University...