...1. INTRODUCTION Pre-drill prediction of overpressure is usually achieved through manipulation of seismic data, founded on the empirical relationship between effective stress and seismic velocity [1,2,3]. Velocity-based methods usually require a normal compaction trend and deviations from...

... deformation (e.g., creep strain), we have incorporated Perzyna viscoplasticity theory to the modified Cam clay cap model. Following the procedure described by Hagin and Zoback in the accompanying paper, the threshold compaction pressure as a function of strain rate is determined from basic hydrostatic...

... 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...

... Reservoir Characterization compressibility pore pressure compaction consequence stress path overburden reservoir geomechanics Reservoir Compaction pore compressibility sandstone elastic limit permeability depletion Upstream Oil & Gas experiment stress path coefficient...

... and other field observations (GPS and compaction-log). The applied workflow reduced uncertainties in forward predictions of stress changes from the geo-mechanical model in and around the compacting reservoir, and enabled the design of a new strategy for sand management in the field. 2. GEO-MECHANICS AND 4D...

... not be considered constant through the entire life of the reservoir. However the simplifications sometimes introduced when analysing the reservoir behaviour, both for production prognosis or compaction estimation, like neglecting or simplifying too much the rock compressibility, may lead to erroneous conclusions...

... wellbore integrity Fluid Dynamics Reservoir Characterization reservoir geomechanics Wellbore Design Upstream Oil & Gas displacement subsidence cylindrical surface Reservoir Compaction compressibility compaction shear stress element analysis reservoir simulation Modeling...

... hydraulic fracturing Upstream Oil & Gas plasticity compaction maximum fracture length injection mechanics waste management Simulation operation fracture propagation New York modeling simulator geometry fracture deformation fracture length critical state line fracture...

... Reservoir Characterization wellbore integrity Upstream Oil & Gas plasticity compaction lochaline sand axial stress unconsolidated sand reservoir geomechanics Fluid Dynamics strength porosity Wellbore Design compressibility pore collapse stress path effective stress onset...

...Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 905809 1554 Implications of static poroelasticity for reservoir compaction R. W.Zimmerrnan T. HHuxley School of Environment, Earth Sciences aOO Engineering'/mperial College, LoOOon, UK ABSTRACT: Some...

... standard "uncoupled". petroleum geomechanics results. It is becoming standard practice to evaluate the compaction of pe- troleum reservoirs by inputting the "effective stress" changes brought about by reservoir depletion or in- jection into an analytic or FEM geomechanics model. The deformations due...

... Characterization Upstream Oil & Gas Simulation reservoir geomechanics strength core analysis axial strain sandstone loading stiffness particle compaction stress release bond strength experiment laboratory laboratory experiment stress level size effect synthetic sandstone damage effect...

... Reservoir Characterization Reservoir Compaction Upstream Oil & Gas compaction rotation experiment grain fragmentation laboratory microscopy reservoir geomechanics Castlegate porosity compressive stress Fredrich US government breakage AE activity society of petroleum...

... with a hardening or hardening/softening elliptical end cap to define pore collapse. While these traditional models describe compactive yield and ultimate shear failure, difficulties arise when the behavior involves a transition from compactive to dilatant deformation that occurs before the shear failure or limit...

...Rock Mechamcs, Auberttn, Hassam & M tn (eds) ¸ 1996 Balkema, Rotterdam ISBN 90 5410 838 X Two-dimensional nonlinear finite element analysis of well damage due to reservoir compaction, well-to-well interactions, and localization on weak layers L. Brun Hilbert, Jr- University ofCalifornia t Berkeley...

... compaction and eventual failure at a constant strain rate. The decay in inferred hydraulic diffusivity here is found to be exponential, with a rate constant which depends both on stress state and the fluid chemistry, and which may change during deformation. In particular strain hardening deformation is found...

... that reflects the deformation behavior of irregularly shaped particles. Two-dimensional models also tend to overestimate the volumetric strain response of dilatancy relative to compaction because of the differences in porosity in three dimensions compared to areal density in two dimensions. Accordingly...

.... These anisotropies continue to increase after yielding, for about 1 to 2% volumetric strain, at which point the acoustic velocities begin to increase and the velocity anisotropies remain constant for the duration of the test. Hydrostatic compaction tests evidence small acoustic anisotropies which develop during...