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Finite element modelling of hydraulic fracture flow in porous media. / Mauricio Centeno Lobao

Swansea University Author: Mauricio Centeno Lobao

Abstract

In the present thesis, a computational framework for the analysis of coupled hydro-fracture flow in deformable porous media using a Finite/Discrete Element Method is presented. In this context, a series of developments have been made in order to provide a more efficient and robust numerical model ca...

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Published: 2007
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42741
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spelling 2018-08-02T16:24:30.3050039 v2 42741 2018-08-02 Finite element modelling of hydraulic fracture flow in porous media. c1c378447314486ea027d81d6b213f70 NULL Mauricio Centeno Lobao Mauricio Centeno Lobao true true 2018-08-02 In the present thesis, a computational framework for the analysis of coupled hydro-fracture flow in deformable porous media using a Finite/Discrete Element Method is presented. In this context, a series of developments have been made in order to provide a more efficient and robust numerical model capable of dealing with oil production and slope stability problems. The mechanical response of the skeleton is highly dependent on its seepage behaviour as pore pressure modifications affect the in situ stress field. The u-p formulation has been employed using an explicit time integration scheme where fully saturated and single-phase partially saturated analysis are incorporated for 2-D and 3-D cases. Owing to their inherent simplicity, low order elements provide an excellent framework in which contact conditions coupled with crack propagation can be dealt with in an effective manner. For linear elements this implies single point integration which, however, can result in spurious zero-energy modes. Therefore, in order to obtain reliable results, a stabilization technique has been devised to eliminate hourglassing. The success of the modelling strategy ultimately depends on the interdependence of different phenomena. The linking between the displacement components, network and pore pressures represents an important role in the efficiency of the overall coupling procedure. Therefore, a master-slave technique is proposed to link seepage and network fields, proving to be particularly attractive from a computational cost point of view. Another important development that has provided substantial savings in CPU times is the use of an explicit-explicit subcycling scheme. Numerical examples have been used to assess the accuracy and efficiency of the proposed framework. Special attention is focused on the investigation of hydraulic fracture propagation in oil production problems and plane failure analysis of the stability of slopes. E-Thesis Civil engineering.;Hydraulic engineering.;Geological engineering.;Petroleum engineering. 31 12 2007 2007-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.3050039 2018-08-02T16:24:30.3050039 College of Engineering Engineering Mauricio Centeno Lobao NULL 1 0042741-02082018162518.pdf 10807510.pdf 2018-08-02T16:25:18.3230000 Output 15646468 application/pdf E-Thesis true 2018-08-02T16:25:18.3230000 false
title Finite element modelling of hydraulic fracture flow in porous media.
spellingShingle Finite element modelling of hydraulic fracture flow in porous media.
Mauricio Centeno Lobao
title_short Finite element modelling of hydraulic fracture flow in porous media.
title_full Finite element modelling of hydraulic fracture flow in porous media.
title_fullStr Finite element modelling of hydraulic fracture flow in porous media.
title_full_unstemmed Finite element modelling of hydraulic fracture flow in porous media.
title_sort Finite element modelling of hydraulic fracture flow in porous media.
author_id_str_mv c1c378447314486ea027d81d6b213f70
author_id_fullname_str_mv c1c378447314486ea027d81d6b213f70_***_Mauricio Centeno Lobao
author Mauricio Centeno Lobao
author2 Mauricio Centeno Lobao
format E-Thesis
publishDate 2007
institution Swansea University
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
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description In the present thesis, a computational framework for the analysis of coupled hydro-fracture flow in deformable porous media using a Finite/Discrete Element Method is presented. In this context, a series of developments have been made in order to provide a more efficient and robust numerical model capable of dealing with oil production and slope stability problems. The mechanical response of the skeleton is highly dependent on its seepage behaviour as pore pressure modifications affect the in situ stress field. The u-p formulation has been employed using an explicit time integration scheme where fully saturated and single-phase partially saturated analysis are incorporated for 2-D and 3-D cases. Owing to their inherent simplicity, low order elements provide an excellent framework in which contact conditions coupled with crack propagation can be dealt with in an effective manner. For linear elements this implies single point integration which, however, can result in spurious zero-energy modes. Therefore, in order to obtain reliable results, a stabilization technique has been devised to eliminate hourglassing. The success of the modelling strategy ultimately depends on the interdependence of different phenomena. The linking between the displacement components, network and pore pressures represents an important role in the efficiency of the overall coupling procedure. Therefore, a master-slave technique is proposed to link seepage and network fields, proving to be particularly attractive from a computational cost point of view. Another important development that has provided substantial savings in CPU times is the use of an explicit-explicit subcycling scheme. Numerical examples have been used to assess the accuracy and efficiency of the proposed framework. Special attention is focused on the investigation of hydraulic fracture propagation in oil production problems and plane failure analysis of the stability of slopes.
published_date 2007-12-31T03:56:34Z
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score 10.897445