...EFFECT OF PORE PRESSURE ON STRESS REORIENTATION AND HYDRAULIC FRACTURE DEVIATION *A. Gholami, M.A. Aghighi and S.S. Rahman School of Petroleum Engineering University of New South Wales Anzac Pde, UNSW 2052 (*Corresponding author: [email protected]) Innovations in Applied and Theoretical Rock...

..., specifically, taking the effect of reservoir pore pressure in the vicinity of the wellbore on the wellbore stability into account. Then experiments on the triaxial stress evaluation were conducted at laboratory where rock mechanical parameters such as Poisson's ratio, Young's modulus, compressive strength...

... engineering concerns like reservoir-induced earthquake, landslide and dam stability. The Malpasset dam and Vajont dam are typical hydraulic projects suffering from seepage in dam foundation and slope, which finally led to failure and landslide. Pore pressure in jointed rock masses is considered...

... reservoir geomechanics pore pressure capillary suction clay shale Nonlinear failure envelope confinement amann Reservoir Characterization strength specimen interpretation dilatancy rock mechanics isrm13 Upstream Oil & Gas 13th international congress failure envelope...

...) which assumes that the total stresses, , are equal to the sum of the effective stresses and the pore pressure, p, according to, ' .m p = + (1) where m is the equivalent vector of Kronecker s delta, which according to Biot (1956) can be represented as m = {0 1}T and the tensile stress and pore...

... by considering the three-layer as an equivalent layer storage formation is analyzed. KEYWORDS Carbon dioxide CO2, equivalent and three-layer storage formation, fault reactivation, hydro-mechanical effects INTRODUCTION Large-scale storage of CO2 in deep underground reservoirs may cause considerable pore-pressure...

... with thermal decomposition of minerals affect the pore pressure and the temperature evolution of the system, and can play a significant role in the extreme strain localization observed in field. The actual width of the localized zone is a key parameter for understanding fault weakening mechanisms. On the basis...

... coalbed methane Fluid Dynamics volumetric strain flow in porous media Upstream Oil & Gas Reservoir Characterization coal seam gas free energy coal bed methane pore pressure complex reservoir surface stress permeability change permeability adsorption surface area porosity...

... of plasticity can accurately describe the nonlinearity of elastic-plastic deformation. Whether the rock is yielded or not is determined by in-situ stress, yield stress, Biot coefficient and pore pressure. Plastic yield has little influence on radial stress but significant impact on circumferential stress...

... Abstract The mechanical behaviour of rock materials is largely influenced by the stress state and pore pressure; this needs to be considered in many applications, such as petroleum engineering, tunnelling or stability of underground excavations. Conventional triaxial tests (σ 2 = σ 3...

... and hydromechanical behaviour observed during the GCS drift digging. The concept of the mine-by experiment emplaced around GCS is presented first. In the second part, the first results in terms of deformations, loading of the support and pore pressure evolution obtained during the drift excavation (short term...

... construction. Upstream Oil & Gas Thickness safety factor emergency spillway tunnel tunnel pressurized tunnel diversion tunnel leakage construction reservoir geomechanics deformation pore pressure Stability Evaluation rock mass pressurized water tunnel Reservoir Characterization...

... and parame- ter input hydraulic calculation will initially be carried out at an injection time interval t. Immediately a change in pore pressure (induced by fluid injection) occurs, the mechanical calculation will be turned on. The total system will no longer be in the state of mechanical equilibrium due...

...). Groundwater is temporarily removed from the rock sur- rounding the cavern during the first phase of construction. This preliminary de-saturation of the host rock mass aims at preventing unacceptable hydrostatic pore pressure and ice for- mation behind the cavern lining. After excavation of cavern...

... reservoir geomechanics variation Stockholm SKB Reservoir Characterization diffusivity hydraulic conductivity hydraulic diffusivity repository permafrost pore pressure ice sheet Lönnqvist rock mass Upstream Oil & Gas fracture Sweden hydrostatic pressure normal stress HÃ...

... effect, and the interconvertibility of mechanical and thermal energy. The model is used to analyze the problem of a wellbore subjected to a hydrostatic in situ stress field. The results indicate that heating induces an increase in the pore pressure, while cooling induces a decrease in the pore pressure...

... ABSTRACT Poroelastic and hydraulic parameters of sedimentary rocks were estimated simultaneously from triaxial compression tests with instantaneous change of axial stress, confining pressure, or pore pressure. In terms of hydraulic constants, those from triaxial tests agreed well with those...

... Reservoir Characterization wellbore stability criterion input parameter rock property determination mud weight procedure stability Upstream Oil & Gas pore pressure correlation rock strength wellbore-stability analysis sensitivity investigation optimum mud weight Harmonising Rock...

... and saturated rock. It has been shown that pore pressure plays an important role in borehole stability and that the Mohr-Coulomb criterion is apparently conservative. The Drucker-Prager criterion is non-conservative and overpredicts the 2 strengthening effect. The Modified Lade criterion is a moderate one...

..., reopening of rock joints on the cavern sur- face, load on rock bolts, settlement of the ground surface, pore pressure distribution in the rock mass and the variation of the ground water level. All the instruments were equipped with thermal sensors to measure the temperature at the depth of the monitoring...