... dissipation papanastasiou fluid dynamics flow in porous media simulation tensor plastic deformation porous elasto-plastic media hydraulic fracture propagation plasticity history ARMA 22 0407 Influence of plastic dissipation on the behviour of hydraulic fracturing in a saturated porous elasto...

... finding results from hydraulic fracture simulation studies in weak formations that were carried out originally to investigate the highnet pressures that are often observed in field operations and the differences between simulators and field measurements (Papanastasiou, 1997). Experimental studies have...

... fracture toughness fracture propagation papanastasiou hydraulic fracture propagation deformation hydraulic fracturing fracture journal mechanism interface international journal plasticity fracture height containment propagate ARMA 22 0601 A Plasticity Mechanism for Hydraulic Fracture Height...

... mechanic geomechanics symposium upstream oil & gas equation erosion vardoulakis papanastasiou ARMA 22 0854 A Simplified Hydro-Mechanical Model for Sanding from Hollow Cylinder Tests Gravanis, E. Department of Civil Engineering and Geomatics, Cyprus University of Technology, Limassol, Cyprus...

... mechanical property hydraulic fracture hydraulic fracturing fracture toughness ductility fracture propagation fracture initiation time propagation breakdown international journal rock mechanical test fracture mechanics Upstream Oil & Gas Rock mechanics fracture initiation Papanastasiou...

... fracture front mechanism crack tip atkinson climate change subsurface storage strength propagate Papanastasiou reservoir geomechanics Upstream Oil & Gas injectivity fracture deformation dislocation geological storage insitu stress propagation ARMA 16-362 Hydraulic Fracturing in CO2...

... dislocation correspond criterion papanastasiou propagation scale yielding hydraulic fracturing reservoir geomechanics brittleness index quantity assumption plasticity upstream oil & gas energy release ductility fracture displacement fracture propagation strength small scale ARMA 15...

... stability multilateral well lateral wellbore Mise stress contour plot Papanastasiou stress cloud in-situ stress azimuth junction angle principal in-situ stress ARMA 08-364 Modeling of Stability of Junctions in Multilateral Wells using Finite Element Alberto López Manríquez Delgac, Petroleum...

... of an internally pressurized cylinder (Papanastasiou et al. 1995). We found that when initiation of a tensile fracture occurs in the elastic regime, the breakdown pressure can be estimated from equation (1). When tensile failure occurs after plastic yielding, classical elastoplasticity predicts a breakdown...

... logic programming Upstream Oil & Gas tensile failure Thiercelin Hubbert regime initiation pressurization experiment MPa cavity expansion tensile stress breakdown pressure Papanastasiou estimation Willis equation plastic fracture generalized stress internal pressure equation...