... US government Reservoir Characterization reservoir geomechanics Fluid Dynamics GeoModel microcrack porosity application Upstream Oil & Gas strength triaxial compression compression test invariant compaction pore collapse Wellbore Design limit surface elasticity stress state...

... with an induced anisotropic damage. The latter is due to initiation and growth of oriented microcracks that lead to directional deterioration of elastic properties. A constitutive model coupling plastic deformation and induced anisotropic damage is then proposed. The plastic behaviour is described by a typical...

... ABSTRACT ABSTRACT Cracks develop in brittle materials under compressive load as a result of growth of microcracks causing irreversible damage and produce acoustic emission (AE). At high applied load, this damage causes strain localization leading to the ultimate fracture plane. Laboratory...

... characterization micromechanism sandstone fracture mechanism Reservoir Characterization trajectory hydraulic fracturing microcrack crack growth EC test Upstream Oil & Gas crack length specimen edge cleavage specimen porous rock geometry fracture surface loading condition experimental data...

... anisotropy (Rothman, 1975; O'Connell & Budianski, 1974; Jaeger & Cook, 1979; Crampin, 1981; Zheng, 1989; Sayers, 1990; Hudson, 1991). However, more specific information about the approach to failure can be obtained by taking advantage of the tendency for microcracks to predominantly orient along...

... to their inherent microcrack fabric, and the Inada granite has the distinct anisotropy of this kind. In this study, specimens in nearly three anisotropic directions, perpendicular to each other (the velocities of longitudinal wave are 4.59 km/s, 5.00 km/s, and 4.82 km/s), were measured. The results of permeability...

... directions. This is discussed in the light of the influence of in-situ microcracks on core-based stress orientation techniques. Reservoir Characterization maximum strain reservoir geomechanics orientation drilling operation microcrack Upstream Oil & Gas Perreau core sample Elf core...

... analysis technique, the linear microcrack strains are the difference between the observed response of the strain gage and the estimated intrinsic material strain. These crack strains may be displayed in a tensor form and principal directions and magnitudes calculated, the trace of the crack strain tensor...

... on the micromechanics of microcrack closure and grain elasticity we have related the nonlinear dynamic response of a granular rock to the nonlinear behavior under static loading. Such a relationship between nonlinear static and dynamic properties will be helpful in understanding the nonlinear behavior of granular rocks...

... Characterization strength critical exponent rock mass symmetry tricritical point tensile strength fracture brittle fracture equation incipient failure macrocrack Upstream Oil & Gas microcrack phase change critical phenomenon continuous phase transition order parameter Rock Mechanics, Nelson...