... in mined hard-rock caverns requires the presence of a water curtain system approximately 20 m above the storage galleries such as to obtain a permanent convergent flow of water in the caverns. A good understanding of the effects of the distribution of the water pore pressure in the different joint sets...

... and changes the distribution of pore pressure around the wellbore. Matrix with high permeability will trigger a more severe breathing effect. However, Young's modulus has little effect on breathing effect. The degree of breathing effect will not deteriorate with the further aperture increase of fracture...

... ABSTRACT: The pore pressure evolution induced by excavation of drifts is analyzed by means of a fully coupled hydro-mechanical finite element simulation. Special emphasis is given to anisotropic initial stress state and anisotropy of the elastic parameters of the rock. The main goal...

... gas monetization Efficiency water curtain tunnel cavern excavation hydraulic fracturing Downstream Oil & Gas pore pressure cavern water curtain construction borehole water curtain borehole compression operation water curtain bore-hole storage cavern water curtain system Rock...

... ABSTRACT: The effective pressure law for the permeability of sandstone is experimentally studied by conducting Darcy's law permeability test under various confining pressure (from 14 to 58 MPa) and pore pressure (from 8 to 23 MPa). Supercritical CO 2 as a pore fluid has been adopted instead...

... with depth due to influence of ground weathering. In this study, coupled stress-flow analysis is performed by calculating two-phase flow, taking into account the effects of pore air pressure. Furthermore, the impacts of weathering on slope stability are also investigated. pore pressure cohesion...

... obtained results such as deformations, strains, stresses, pore pressure, utilisation, forces in the deformation elements and lining sectional forces etc. are time dependent. In order to achieve an acceptable system behaviour, the support measures had to be adjusted to the considered rock conditions...

... properties of COX is considered by applying anisotropic THM parameters. A pore pressure dependent permeability model has been developed to explain the experimental observations. The dependency of thermal conductivity on saturation degree and the temperature effect on water retention behaviour have been...

... concerning the repository layout and long-term behaviour are highlighted. 1 Introduction One of the most important aspects in each geomechanical analysis is the appropriate understanding of the stress field, i.e. the in situ stresses including the pore pressure with their spatial and temporal variation...

... and communicated in a number of ways, as depicted in Figure 3. 2.2 Analysis methodology An initial analysis that included OBG, pore pressure, and calibration to all of the available data was per- formed on each well. In addition, an initial WBS analysis was performed on one select well. At this point, a peer...

... variations. Due to the increasing pore pressure fluid, the size and aperture distribution of the fractures are modified resulting in the formation of preferential flow channels within the geological formation. The numerical approach proposed in this paper is a fully coupled hydro-mechanical model...

... determinations. Transient-state techniques provide with a work- able alternative allowing faster determinations. Here we evaluate three transient state methods: the pulse decay (PDM), the pore-pressure transmission (PPTM) and the pore-pressure oscillation (PPOM) methods which are compared with the conventional...

... common and the main cause for most of problems during drilling operations. In this study, the existing relevant logs, drilling and other data from offset well were analyzed and integrated to construct a precise Mechanical Earth Model (MEM) describing pore pressure, stress magnitudes and orientation...

... & M. Ziegler Geotechnical Engineering, RWTH Aachen University, Aachen, Germany T. Kempka GFZ German Research Centre for Geosciences, Hydrogeology, Potsdam, Germany ABSTRACT: The injection of CO2 into a reservoir can influence the initial stress state significantly due to changes in pore pressures...

... the contribution of pore pressure to the effective stress. For the granular soil, the contact area among grains is very small, thus it is possible to assume that a cross section which is considered is almost occupied by the fluid. Hence, the corresponding effective stress coef- ficient approximately equals to 1...

... Saline Aquifer Upstream Oil & Gas Reservoir Characterization Sequestration Simulation coupling pore pressure reactivation co 2 aquifer reservoir geomechanics modeling injection Vilarrasa constitutive model Rutqvist fracture permeability international journal storage...

... continuous inclinometers – 60 sensors to the depths of 14 to 16 m. One station included 3 uniaxial in-place sensors, automatic piezometer and groundwater pore pressure transducer. Weather monitoring station performed measurements of precipitation, air pressure, air humidity and air temperature. Data were...

... Abstract The Biot consolidation theory allows the formulation the effective stress law in the form of equation binding the components of the stress tensor with the value of pore pressure. This equation contains certain factors (the so-called Biot coefficients) which are mathematical functions...

... sandstone enhanced recovery steam-assisted gravity drainage pore pressure internal friction angle high temperature permeability Rock Mechanics for Resources, Energy and Environment Kwas´niewski & ydz ba (eds) © 2013 Taylor & Francis Group, London, ISBN 978-1-138-00080-3 Dynamic and static rock...

... selecting fracture mechani-cal properties for analyzing HM processes in detail, several aspects should be consid-ered. In situ stresses (natural and induced), as well as hydraulic head (pore pressure), should be described. complex reservoir displacement hydraulic fracturing modeling conductive...