.... It may be observed that if a=O (pure solid without pores), and if P2 =0, then the tangential stress is simply -P1 as expressed in equation (9). It may also be noted that if a=1 (Ks»Ks) and VB=0.25, so that ~B=1/3, then, when P2=0, aoo = - P,/3. This implies that, for porous materials, the tangential...

...-point, and final configurations at each loading step are set, including the corresponding coordinates, the incremental displacements, the incremental strains, and the incremental stresses. The introduction of the second-order and third-order elastic constants yields equations of motion...

... fracturing method is the best way to measure the rock stress. reservoir geomechanics observation equation Finland Johansson Reservoir Characterization Upstream Oil & Gas Raasakka water management Yokoyama Rock stress in-situ rock stress shut-in pressure ps borehole high stiffness...

... ABSTRACT: In-situ stress field inversion is to find a model or parameter, which can fit practical data as much as possible. According to the fundamental equations of elastic mechanics, the optimization constraint model based on the least square method is established. The optimization method...

... aperture free surface rock mass Reservoir Characterization Monte Carlo simulation htpf test Upstream Oil & Gas procedure displacement application matrix fracture equation interaction valinezhad Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0...

... shear stress stress drop standard error stress field California estimation absolute stress value Lander earthquake stress direction stress value equation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 An estimation of the absolute...

... shaft equation single well injection low permeability coal seam exploitation coal seam gas heat injection interference in-situ rock stress Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Numerical simulation on in-situ rock stress...

... method laboratory experiment equation Method and theory of in-situ stress measurement Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Application of a downward compact conical-ended borehole overcoring technique to orthotropic rock K. Sakaguchi...

... Computation height direction equation in-situ stress difference Pump Rate TISR fracture propagation length direction Reservoir Characterization elliptical fracture fluid pressure matrix young modulus fracture Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN...

... is established. The finite element equation is derived on the basis of the orthotropic dual media mathematical model, and also the relative two dimensional program of finite element method is developed. Taking the ZP-1well in Qinshui Basin as an example, the effect of the permeability orthotropic coefficient...

... at the center of this arrangement. Reservoir Characterization reservoir geomechanics accuracy validity evaluation gauge critical laboratory investigation displacement procedure concrete block equation installation Situ stress Determination compaction diagonal Duvall vertical direction...

... calculation horizontal stress rock mechanics parameter horizontal principal stress tectonic stress coefficient Reservoir Characterization stress component Santanghu Basin work data closure pressure principal stress equation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group...

... Mining Engineering rock mass metals & mining construction deformation initial stress feasible study Engineering Earthquake roadway stress field equation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Feasible study...

... eberhart Particle Swarm Optimization optimization particle swarm algorithm convergence rate equation machine learning Upstream Oil & Gas back analysis solution space PSO algorithm Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8...

... Characterization stress component database principal stress reservoir geomechanics deviation stress measurement stress database accuracy assessment intelligent data analysis system estimation principal stress direction equation reliability analysis Rock Stress and Earthquakes Xie (ed.) © 2010...

... orientation maximal coefficient maximal horizontal stress reservoir geomechanics stress relief measurement depth range stress orientation machine learning stress variation in-situ stress measurement tectonic stress minimal horizontal stress equation Upstream Oil & Gas regression equation...

.... metals & mining formula calibration sensitivity instrument pressure change simple structure borehole strainmeter elastic cylinder three-chamber structure type tj-3 stability Probe hydraulic pressure change silicone oil sensor equation power consumption solenoid valve Rock Stress...

... drillstring design three-dimensional mohr diagram Mohr diagram plane reactivation diagram Magnitude stress tensor principal stress differential stress sub-stress tensor slip envelope rotation shear stress equation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London...

... of a singular radial fracture and the measuring of fracture opening value on the outline dependence of the pressure in the impenetrable shell are proposed. The fractures are induced by hydraulic fracturing in advance. The test of the solution is carried out using singular integral equations of linear fracture...

... viscous fluid flow initiation injection system hydraulic fracture breakdown pressure breakdown pressure fracture reservoir geomechanics Upstream Oil & Gas equation propagation injection system compressibility different value Lakirouhani tensile strength Rock Stress and Earthquakes...