Stress effects on reservoir flow: — Numerical modelling used to reproduce field data

Heffer, Kes; Koutsabeloulis, Nick

doi:10.1144/gsl.sp.1995.084.01.09

Cited by 21 publications

(13 citation statements)

References 8 publications

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“…Numerical geomechanical modeling of the areal influence of cooling, coupled with fluid flow gave rise to an areal pattern of shear zones (relative to S hmax ) that closely resembles the peaks in the frequencies of the field breakthrough orientations for "unfractured" reservoirs ( Fig. 2c; Heffer and Koutsabeloulis, 1993 Conceptual after Zhu and Wong (1997) and Crawford et al (1999) Average effective stress, p' Onset of plastic hardening Initial yield cap D i l a t a t i o n a l , b r i t t l e f a i l u r e Perm. decrease ?…”

Section: Flood Directionality -Aggregated Field Data Statisticsmentioning

confidence: 77%

Geomechanical Influences in Water Injection Projects: an Overview

Heffer¹

2002

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Présentation générale des effets géomécaniques induits par l'injection d'eau dans les réservoirs -Au cours de l'injection d'eau, l'augmentation des pressions interstitielles et la diminution de température entraînent une diminution des contraintes effectives horizontales, notamment à proximité des puits d'injection. Ce déchargement mécanique peut activer des failles et des fractures naturelles au sein du réservoir, du recouvrement, des couches inférieures ou des fractures hydrauliques à proximité des puits d'injection. Ces effets géomécaniques induisent des modifications anisotropes de la perméabilité, généralement en augmentation, qui devraient être intégrées dans la simulation du réservoir, particulièrement du point de vue de la configuration des puits, afin d'en obtenir les meilleurs avantages commerciaux. , over-or under-burden, or Abstract -Geomechanical Influences in Water Injection Projects: An Overview -During water injection, increasing pore pressures and decreasing temperatures imply reductions in effective horizontal stresses, particularly in proximity to injection wells. This unloading can lead to activation of the natural faults and fractures by brittle failure in the body of the reservoir

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Section: Flood Directionality -Aggregated Field Data Statisticsmentioning

confidence: 77%

Geomechanical Influences in Water Injection Projects: an Overview

Heffer¹

2002

Oil & Gas Science and Technology - Rev. IFP

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“…This information on the in situ stress distribution can be used for an improved planning of numerous reservoir applications and may also provide further insights into the drainage pattern of the reservoir, since particularly in fractured reservoirs the tectonic stress causes fluid flow anisotropies (Heffer and Koutsabeloulis, 1995). In addition, the tendency of the existing fault network to slip or dilate in the present-day stress regime can be addressed.…”

Section: Discussionmentioning

confidence: 99%

A workflow for building and calibrating 3-D geomechanical models &ndash a case study for a gas reservoir in the North German Basin

Fischer

Henk

2013

Solid Earth

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Abstract. The optimal use of conventional and unconventional hydrocarbon reservoirs depends, amongst other things, on the local tectonic stress field. For example, wellbore stability, orientation of hydraulically induced fractures and -especially in fractured reservoirs -permeability anisotropies are controlled by the present-day in situ stresses. Faults and lithological changes can lead to stress perturbations and produce local stresses that can significantly deviate from the regional stress field. Geomechanical reservoir models aim for a robust, ideally "pre-drilling" prediction of the local variations in stress magnitude and orientation. This requires a numerical modelling approach that is capable to incorporate the specific geometry and mechanical properties of the subsurface reservoir. The workflow presented in this paper can be used to build 3-D geomechanical models based on the finite element (FE) method and ranging from field-scale models to smaller, detailed submodels of individual fault blocks. The approach is successfully applied to an intensively faulted gas reservoir in the North German Basin. The in situ stresses predicted by the geomechanical FE model were calibrated against stress data actually observed, e.g. borehole breakouts and extended leak-off tests. Such a validated model can provide insights into the stress perturbations in the inter-well space and undrilled parts of the reservoir. In addition, the tendency of the existing fault network to slip or dilate in the present-day stress regime can be addressed.

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“…Flow anisotropy or permeability anisotropy has been documented in many fields that depend on fracture permeability for production (Heffer and Lean, 1993; Heffer and Koutsabeloulis, 1995).…”

Stress effects on reservoir flow: — Numerical modelling used to reproduce field data

Cited by 21 publications

References 8 publications

Geomechanical Influences in Water Injection Projects: an Overview

Geomechanical Influences in Water Injection Projects: an Overview

A workflow for building and calibrating 3-D geomechanical models &ndash a case study for a gas reservoir in the North German Basin

Naturally fractured tight gas reservoir detection optimization. Final report

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