Modeling the effects of natural fractures on the permeability of reservoir rocks
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/190698 |
Resumo: | This work presents a numerical method based on Discrete Fracture Model (DFM) and the Finite Element Method (FEM), where the fractures are approximated by a reduced model. The flow along and across the fracture is described by a simplified set of equations considering both conductive fractures and barriers. The coupled hydromechanical model is composed of a linear poroelastic Biot medium and a nonlinear model based on damage mechanics for the fractures, which captures the nonlinear normal deformation and shear dilation according to the Barton-Bandis model. Both flow and geomechanical models are approximated using the finite element model. Fractures are explicitly represented by three-node standard finite elements with high aspect ratio (i.e. ratio between the largest and the smallest element dimensions) and appropriate constitutive laws. These interface high aspect ratio elements represent a regularization method which continuously approximate the discontinuous pressure and displacement fields on a narrow material band around the fracture. The complete mathematical formulation is presented together with the algorithm suggested for its numerical implementation. The efficiency of the proposed method is demonstrated through numerical examples, as well as the effects of fractures in the hydraulic properties of porous rocks and its dependency of the stress state. |
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Modeling the effects of natural fractures on the permeability of reservoir rocksModelagem do efeito de fraturas naturais na permeabilidade de rochas reservatórioFractured reservoirHydromechanical couplingBarton-Bandis modelInterface finite elements with high aspect ratioReservatórios fraturadosAclopamento hidromecânicoModel de Barton-BandisElementos finitos de interface com elevada razão de aspectoThis work presents a numerical method based on Discrete Fracture Model (DFM) and the Finite Element Method (FEM), where the fractures are approximated by a reduced model. The flow along and across the fracture is described by a simplified set of equations considering both conductive fractures and barriers. The coupled hydromechanical model is composed of a linear poroelastic Biot medium and a nonlinear model based on damage mechanics for the fractures, which captures the nonlinear normal deformation and shear dilation according to the Barton-Bandis model. Both flow and geomechanical models are approximated using the finite element model. Fractures are explicitly represented by three-node standard finite elements with high aspect ratio (i.e. ratio between the largest and the smallest element dimensions) and appropriate constitutive laws. These interface high aspect ratio elements represent a regularization method which continuously approximate the discontinuous pressure and displacement fields on a narrow material band around the fracture. The complete mathematical formulation is presented together with the algorithm suggested for its numerical implementation. The efficiency of the proposed method is demonstrated through numerical examples, as well as the effects of fractures in the hydraulic properties of porous rocks and its dependency of the stress state.Este trabalho apresenta um método numérico baseado no Modelo de Fratura Discreta (MFD) e no Método dos Elementos Finitos (MEF), onde as fraturas são aproximadas por um modelo reduzido. O fluxo ao longo e através da fratura é descrito por um conjunto simplificado de equações, considerando tanto fraturas condutoras quanto barreiras. O modelo hidromecânico acoplado é composto por um meio poroelástico linear e um modelo não linear para fraturas, baseado na mecânica do dano e que captura a deformação normal não linear e a dilatância ao cisalhamento de acordo com o modelo de Barton-Bandis. Os modelos de fluxo e geomecânico são aproximados usando o método dos elementos finitos. As fraturas são explicitamente representadas por elementos finitos triangulares de três nós com elevada razão de aspecto (isto é, a razão entre a maior e a menor dimensão do elemento) e leis constitutivas apropriadas. Esses elementos de elevada razão de aspecto representam um método de regularização que aproxima de forma contínua os campos de pressão e deslocamento descontínuos em uma estreita faixa material ao redor da fratura. A formulação matemática completa é apresentada juntamente com o algoritmo sugerido para sua implementação numérica. A eficiência do método proposto é demonstrada através de exemplos numéricos, bem como os efeitos de fraturas nas propriedades hidráulicas de rochas porosas e sua dependência do estado de tensão.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)001Universidade Estadual Paulista (Unesp)Manzoli, Osvaldo Luís [UNESP]Universidade Estadual Paulista (Unesp)Fabbri, Heber Agnelo Antonel2019-10-10T17:40:54Z2019-10-10T17:40:54Z2019-07-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/11449/19069800092587533004056080P8enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESP2024-06-28T19:31:02Zoai:repositorio.unesp.br:11449/190698Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:40:09.585846Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Modeling the effects of natural fractures on the permeability of reservoir rocks Modelagem do efeito de fraturas naturais na permeabilidade de rochas reservatório |
title |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
spellingShingle |
Modeling the effects of natural fractures on the permeability of reservoir rocks Fabbri, Heber Agnelo Antonel Fractured reservoir Hydromechanical coupling Barton-Bandis model Interface finite elements with high aspect ratio Reservatórios fraturados Aclopamento hidromecânico Model de Barton-Bandis Elementos finitos de interface com elevada razão de aspecto |
title_short |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
title_full |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
title_fullStr |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
title_full_unstemmed |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
title_sort |
Modeling the effects of natural fractures on the permeability of reservoir rocks |
author |
Fabbri, Heber Agnelo Antonel |
author_facet |
Fabbri, Heber Agnelo Antonel |
author_role |
author |
dc.contributor.none.fl_str_mv |
Manzoli, Osvaldo Luís [UNESP] Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Fabbri, Heber Agnelo Antonel |
dc.subject.por.fl_str_mv |
Fractured reservoir Hydromechanical coupling Barton-Bandis model Interface finite elements with high aspect ratio Reservatórios fraturados Aclopamento hidromecânico Model de Barton-Bandis Elementos finitos de interface com elevada razão de aspecto |
topic |
Fractured reservoir Hydromechanical coupling Barton-Bandis model Interface finite elements with high aspect ratio Reservatórios fraturados Aclopamento hidromecânico Model de Barton-Bandis Elementos finitos de interface com elevada razão de aspecto |
description |
This work presents a numerical method based on Discrete Fracture Model (DFM) and the Finite Element Method (FEM), where the fractures are approximated by a reduced model. The flow along and across the fracture is described by a simplified set of equations considering both conductive fractures and barriers. The coupled hydromechanical model is composed of a linear poroelastic Biot medium and a nonlinear model based on damage mechanics for the fractures, which captures the nonlinear normal deformation and shear dilation according to the Barton-Bandis model. Both flow and geomechanical models are approximated using the finite element model. Fractures are explicitly represented by three-node standard finite elements with high aspect ratio (i.e. ratio between the largest and the smallest element dimensions) and appropriate constitutive laws. These interface high aspect ratio elements represent a regularization method which continuously approximate the discontinuous pressure and displacement fields on a narrow material band around the fracture. The complete mathematical formulation is presented together with the algorithm suggested for its numerical implementation. The efficiency of the proposed method is demonstrated through numerical examples, as well as the effects of fractures in the hydraulic properties of porous rocks and its dependency of the stress state. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-10T17:40:54Z 2019-10-10T17:40:54Z 2019-07-12 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/11449/190698 000925875 33004056080P8 |
url |
http://hdl.handle.net/11449/190698 |
identifier_str_mv |
000925875 33004056080P8 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129541073272832 |