... stress to cause a breakdown in rock strength and initiate chemical weathering (Fletcher et al., 2006; Buss et al., 2008; Goodfellow et al., 2016). Goodfellow et al. (2016) showed evidence for distributed microcracking of the rock matrix surrounding biotite minerals upon oxidation and a coincident...

... fracturing strength rock-concrete interface upstream oil & gas reservoir characterization mortar specimen rock mechanic international journal mining science tensile loading investigation sensor microcrack engineering granite fracture characterization interface tensile strength...

... the anisotropy is low, the orientation of the minimum velocity corresponds to the highly preferred orientation of plagioclase (010) and biotite (001). Image analyses showed that there is also preferred orientation of microcracks regardless of their size and thermal treatment level. Neutron diffraction...

... ABSTRACT: The phase-field method in damage mechanics is attracting increasing popularity in rock engineering, which bridges the gap between microcracking fracture mechanics and quantified damage mechanics. The quasi-static microcrack propagation can be well captured in FEM via the phase-field...

... heterogeneity (Suàrez-Rivera et al., 2002), and strength parameters (Mitaim et al., 2004). reservoir geomechanics microcrack failure mode critical cutter depth reservoir characterization scratch test particle failure mechanism transition strength cutter depth upstream oil & gas coefficient...

... characterization upstream oil & gas reservoir geomechanics barre granite hydraulic fracturing strength shear strain experiment relaxation experiment rock mechanics relaxation evolution microcrack international journal threshold relaxation stage structural geology stress relaxation multistage...

... ABSTRACT: Understanding of the coupling of microstructural parameters to the mechanical deformation of rock requires a multiscale workflow which incorporates the impact of small scale heterogeneity including micropores and microcracks. Previous studies that identify these small features have...

... the kinetics of microcrack growth for brittle rocks. The novelty of the theory is that the distribution density of microcracks is directly incorporated at the continuum level through the notion of directional damage obtained via the noninteracting homogenization scheme. Friction, crack closure and dilation...

... nucleation stress when shearing became dominant. The dominance of non-tension microcracking was characteristic for oblique foliation. The uniaxial loading of anisotropic migmatite resulted in triaxial stress state regardless of the foliation dip. The minimum stress axis was in the subhorizontal direction...

... ABSTRACT: Carbonate reservoirs are characterized by extremely heterogeneity full of microcracks and vugs in it. It also presents anisotropic property of water filtration in terms of distribution of microcracks and void space. Incidents are common practice when drilling through carbonate...

... area including the tensile and shear microcracks, the pipe apertures, and the pressure evolutions within NFs. 1 INTRODUCTION Presence of natural fractures (NF) is critical in defining a prospective shale gas play. The well-known gas shale plays which have contributed significantly to natural gas...

..., microcracking behavior associated with failure modes is investigated. The simulated results show that the 3D-GBM can capture the strength properties and deformation behavior associated with the failure modes of salt rock. This model provides an alternative and promising method to deeply investigate the micro...

... reduce rock strength mainly by 1) extension of preexisting cracks or formation of new microcracks attributed to the thermal expansion of minerals (Ferrero and Marini, 2001; Shushakova, 2013). Notably, quartz phase transition at 573°C increases the differential expansion between quartz and other...

... the fracture strength varies not just spatially, but also by the angle of loading, this work includes angular variability to properly model a heterogeneous rock domain. Two different microcrack distributions, one angularly uniform and one angularly biased towards a specific angle, are used to show...

... defects and inhomogeneity. In the approach, microcracks with certain statistics are incorporated in the computational domain. In the approach, fracture strength values are sampled using a Weibull probability distribution. We use the Mohr-Coulomb failure criterion to define an effective stress...

... rock failure process of rock under uniaxial compression. The modeling results indicate that the strength heterogeneity of inter- and intra-grain contacts affects the microcrack spatial location and hence the fracturing path and fracture pattern. Moreover, the tensile strength of grain contact controls...

... hydraulic fracturing strength mineral phase boundary CCE reduction orientation Simulation synthetic sample Artificial Intelligence element method microcrack mahabadi strength property intensity penalty grain boundary frictional value finite-discrete element method mechanics 1...

... contribute to the injection-related fracture initiation. fluid modeling Upstream Oil & Gas mechanism equation of state fluid injection cfd-dem approach fluid flow injection hydraulic fracturing Simulation microcrack pressure drop velocity field particle fracture initiation base case...

... scaling method reservoir simulation Reservoir Characterization flow in porous media Artificial Intelligence Fluid Dynamics mashhadian elasticity tensor structural geology microcrack multiscale framework wellbore integrity Wellbore Design modeling shale length scale evolution...

.... The microstructure at different stages of deformation indicates that grain-boundary cracking is the dominant brittle deformation mechanism. Microcracking is influenced by the loading configuration and the geometric relationships between neighboring grains. These microcracks display a preferred orientation parallel...