PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 675–683

© 2020 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 the European Structural Integrity Society (ESIS) ExCo Abstract In this work we consider application of rock damage model to the description of such geomechanical effect accompanying steam assisted gravity drainage method of heavy oil recovery as surface heave. To describe oil recovery by this method, we have developed coupled thermo-hydro-mechanical model which takes into account main mechanisms of steam-assisted gravity drainage which are reduction of the oil viscosity and gravity-based drainage. Constitutive equations for evolution of internal damage-variable were added to the model to simulate additional contribution to strain induced by the growth of the volumetric-type defects (microcracks) due to the increase in the shear-type defects (microshears). Increase in volumetric strains provides evolution of porosity and permeability of the reservoir as well as ensures surface heave. The proposed model was applied to a three-dimensional numerical simulation of the reservoir area containing two pairs of horizontal wells. Specific feature of the simulation is accounting for the non-uniform steam distribution along the horizontal wellbore which strongly affects the shape of the steam chamber. The obtained results have shown that damage-induced strains allow one to obtain significant increase in values of porosity, permeability and vertical displacement in comparison to the case of the pure thermo-elastic strains. © 2020 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 the European Structural Integrity Society (ESIS) ExCo Keywords: SAGD; mesoscopic defects; coupled problems; rock damage 1. Introduction Surface uplift is one of the key geomechanical phenomena accompanying thermal enhanced oil recovery operations. As reported by Uribe-Patino et al. (2017), the observed values of a surface displacement can vary from several millimeters to several centimeters. This effect can be explained as the development of shear failure which occurring in reservoir due to the propagation of the thermal front. Moreover, shear failure together with microfracturing of the 1st Virtual European Conference on Fracture Application of Rock Damage Model to Thermal Oil Recovery 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 Abstract In this work we consider application of rock damage model to the description of such geomechanical effect accompanying steam assisted g avity drainage method of heavy oil recovery as surfac heave. To describe oil recovery by this ethod, we h ve developed couple thermo-hydr -mec anical model which takes into account main mechanisms of steam-assisted gravity drain g which are red ction of the oil viscosity a d gravity-based drainage. Constit tive equations for evolution of internal damage-v riabl ere added to he mod l to simulate a ditional contribut on to strain induc d by the g owth of the volumetric-type defects (microcracks) due to th increase in the shear-type defects (microshears). In rease in volumetric s rains provides evolution of porosity nd permeability of the r servoir as well as nsures urfa e heave. The p oposed m del was appl ed to a thr e-dimensional numerical simulation of the res voi area containing two pairs of horizontal wells. Sp cific f ature of the simulation is accounti g for the non-uniform steam distribut on along he horizontal wellbore which strongly affects the shape of the steam ch mber. The obtained res lts have shown that damage-i duced strains al o one to obtain ignificant in reas in values of porosity, perm ability and vertical di pl c ment i comp rison to the ca e of the pure th rm -elastic stra ns. © 2020 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 u der re ponsibility of European Structural Integri y Soci ty (ESIS) ExC K ywords: SAGD; mesoscopic defects; coupled problems; rock damag 1. Introduction Surface uplift is one of the key geomechanical phenomena accompanying thermal enhanced oil recovery operations. As report d by Urib -Pa ino t al. (2017), the observed v lues of a surfac displacement can vary fr m several millimeters to several centimeters. This effect can b explained as the development of sh ar failure which occurring in reservoir due to the propagation of th therm l front. Moreover, shear failure together with microfracturing of the 1st Virtual European Conference on Fracture Application of Rock Damage Model to Thermal Oil Recovery 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. * Corresponding author. Tel.: +7-342-237-8317; fax: +7-342-237-8487. E-mail address: kostina@icmm.

2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 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 u der responsibility of t European Structural Integrity So i ty (ESIS) ExCo

2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.078