PSI - Issue 37

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Procedia Structural Integrity 37 (2022) 431–438

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract The work is devoted to the numerical study of shear dilation effect on oil recovery rate on the base of the originally develop coupled thermo-hydro-mechanical model. The governing equations of the model include momentum, mass and energy balance laws which are supplemented by constitutive equations and state laws. Filtration of each phase is described by Darcy’s law. Effe ct of pore fluid on stress- strain state of the reservoir is described within Biot theory. Hook’s law is applied to evaluate elastic strains. Plastic str ains are estimated by associated flow rule with Drucker-Prager yield criterion. Numerical simulation is carried out in the finite-element software Comsol Multiphysics using Weak Form PDE Interface, Heat Transfer and Solid Mechanics modules. Field-scale simulation of reservoir area containing injection well has shown that the model can successfully describe surface heave induced by shear failure as well as increase in porosity and permeability values. Moreover, the obtained results have shown that the oil recovery rate gives lower values when plastic strains are not taken into account. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: SAGD; THM models; Shear dilation; Multiphysics problems 1. Introduction Thermally-induced rock dilation is one of the key geomechanical effects accompanying steam-assisted gravity drainage (SAGD). Propagation of thermal front during steam injection leads to initiation of high compressive horizontal stresses with simultaneous reduction of vertical stresses which induces shear failure ahead of the steam front. On macroscale, this effect is observed as displacement of the surface which can attain several centimeters. In Abstract The work is devoted to the numerical study of shear dilation effect on oil recovery rate on the base of the originally develop coupled thermo-hydro-mechanical model. The governing equations of the model include mome tum, mass and energy balance laws which are supplemented by constitutive equations and state laws. Filtration of each phase is described by Darcy’s law. Effe ct of pore fluid on stress- strain state of the reservoir is described within Biot theory. Hook’s law is applied to evaluate elastic strains. Plastic str ains are estimated by associated flow rule with Drucker-Prager yield criterion. Numerical simulation is carried out in the finite-element software Comsol Multiphysics using Weak Form PDE Interface, Heat Transfer and Solid Mechanics modules. Field-scale simulation of reservoir area containing injection well has shown that the model can successfully describe surface heave induced by shear failure as well as increase in porosity and permeability values. Moreover, the obtained results have shown that the oil recover rate gives lower values when plastic strains are not taken into account. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: SAGD; THM models; Shear dilation; Multiphysics problems 1. Introduction Thermally-induced rock dilation is one of the key geomechanical effects accompanying steam-assisted gravity drainage (SAGD). Propagation f thermal ront during st am injection leads to initiation of high compressive hor zontal stresses with simultaneous reduction of vertical stresses wh ch induces shear failure a ead of the steam fr nt. On macroscale, this effect is obs rved as displacement of the surface which can attain s veral centim ters. In ICSI 2021 The 4th International Conference on Structural Integrity Study of Rock Dilation Effect on Oil Recovery during Steam Assisted Gravity Drainage A. Kostina*, M. Zhelnin, O. Plekhov Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia ICSI 2021 The 4th International Conference on Structural Integrity Study of Rock Dilation Effect on Oil Recovery during Steam Assisted Gravity Drainage A. Kostina*, M. Zhelnin, O. Plekhov Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia

* Corresponding author. Tel.: +7-342-237-8317; fax: +7-342-237-8487. E-mail address: kostina@icmm.ru * Corresponding author. Tel.: +7-342-237-8317; fax: +7-342-237-8487. E-mail address: kostina@icmm.ru

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.106