Wellbore stability analysis: From linear elasticity to postbifurcation modelling
Wellbore stability analysis: From linear elasticity to postbifurcation modelling
This paper reviews some of the progress made on wellbore stability modeling during the last two decades. First we demonstrate the improvement made on mud-pressure predictions by moving from analytic elastic solutions to finite element elastoplastic modeling.
We show this progress, presenting a finite element model based on a generalized plane strain formulation for analyzing efficiently the three-dimensional problem of stability in deviated wellbores. On a more research oriented work, we present results from two advanced theories capable of modeling localization of deformation in shear bands, which causes borehole breakouts. The first theory is based on a more established approach, the Cosserat continuum.
The second theory, called gradient elastoplasticity, is being developed to resolve some of the drawbacks of gradient plasticity theories. Gradient elastoplasticity is a unified theory where both elastic and plastic parts are of gradient type. We demonstrate that both theories, in addition to localization, can also model the scale effect observed in thick-walled cylinder tests
elastoplasticity, deformation, scale effect, plasticity, models, finite element method, cylinders
2-12
Papanastasiou, Panos
a8bb3a01-39ec-4bd6-9e41-70a081503f65
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e
2004
Papanastasiou, Panos
a8bb3a01-39ec-4bd6-9e41-70a081503f65
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e
Papanastasiou, Panos and Zervos, Antonios
(2004)
Wellbore stability analysis: From linear elasticity to postbifurcation modelling.
International Journal of Geomechanics, ASCE, 4 (1), .
(doi:10.1061/(ASCE)1532-3641(2004)4:1(2)).
Abstract
This paper reviews some of the progress made on wellbore stability modeling during the last two decades. First we demonstrate the improvement made on mud-pressure predictions by moving from analytic elastic solutions to finite element elastoplastic modeling.
We show this progress, presenting a finite element model based on a generalized plane strain formulation for analyzing efficiently the three-dimensional problem of stability in deviated wellbores. On a more research oriented work, we present results from two advanced theories capable of modeling localization of deformation in shear bands, which causes borehole breakouts. The first theory is based on a more established approach, the Cosserat continuum.
The second theory, called gradient elastoplasticity, is being developed to resolve some of the drawbacks of gradient plasticity theories. Gradient elastoplasticity is a unified theory where both elastic and plastic parts are of gradient type. We demonstrate that both theories, in addition to localization, can also model the scale effect observed in thick-walled cylinder tests
This record has no associated files available for download.
More information
Published date: 2004
Keywords:
elastoplasticity, deformation, scale effect, plasticity, models, finite element method, cylinders
Identifiers
Local EPrints ID: 39397
URI: http://eprints.soton.ac.uk/id/eprint/39397
ISSN: 1532-3641
PURE UUID: 4f945a14-1e01-45d4-8437-a2bfddffaf9c
Catalogue record
Date deposited: 28 Jun 2006
Last modified: 16 Mar 2024 03:32
Export record
Altmetrics
Contributors
Author:
Panos Papanastasiou
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
