PSI - Issue 18

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

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Procedia Structural Integrity 18 (2019) 301–308

25th International Conference on Fracture and Structural Integrity Numerical Simulation of Rock Damage Induced by Steam Injection in a Horizontal Wellbore during the Crude Oil Production A. Kostina a, *, M. Zhelnin a , O. Plekhov a , Yu. Klukin b a Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Mining Institute of the Ural Branch of Russian academy of science, Sibirskaya st., 78a, Perm, 614007, Russia Abstract Application of damage mechanics to problems of thermal oil extraction is caused by a significant influence of structural evolution on permeability and porosity of rocks. In this work damage evolution in the reservoir is described in terms of the macroscopic structural parameter which has a physical meaning of the additional (structural) strain induced by the initiation and evolution of the defects. The specific feature of the work is application of the structural parameter to a comprehensive behavior of a multiphase porous media subjected to simultaneous mechanical and thermal loadings. A three-dimensional numerical simulation of the steam assisted gravity drainage process with and without structural changes was carried out. As a result, it has been shown that defect induced strains significantly affect the values of surface heave, porosity and permeability and, as a consequence, the oil production rate. 25th International Conference on Fracture and Structural Integrity Numerical Simulation of Rock Damage Induced by Steam Injection in a Horizontal Wellbore during the Crude Oil Production A. Kostina a, *, M. Zhelnin a , O. Plekhov a , Yu. Klukin b a Institute of conti uou media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Mining Institute of the Ural Branch of Russian academy of science, Sibirskaya st., 78a, Perm, 614007, Russia Abstract Application of damage mechanics to problems of thermal oil extraction is caused by a significant influence of structural evolution on permeability and porosity of rocks. In this work damage evolution in the reservoir is described in terms of the macroscopic structural parameter which has a physical meaning of the additional (structural) strain induced by the initiation and evolution of the defects. The specific feature of the work is application of the structural parameter to a comprehensive behavior of a multiphase porous media subjected to simultaneous mechanical and thermal loadings. A three-dimensional numerical simulation of the steam assisted gravity drainage process with and without structural changes was carried out. As a result, it has been shown that defect induced strains significantly affect the values of surface heave, porosity and permeability and, as a consequence, the oil production rate.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

Keywords: SAGD; mesoscopic defects; coupled problems; rock damage Keywords: SAGD; mesoscopic defects; coupled problems; rock damage

1. Introduction Thermal methods of oil recovery are widely applied to the development of crude oil deposits. Usually, these methods are based on the injection of steam into vertical or horizontal wells. High temperature significantly reduces oil viscosity, increases oil mobility and enhances oil production rate. Accurate simulation of thermal oil recovery requires simultaneous consideration of flow, thermal and mechanical processes. As it has been mentioned by Shafiei 1. Introduction Thermal methods of oil recovery are widely applied to the development of crude oil deposits. Usually, these methods are based on the injection of steam into vertical or horizontal wells. High temperature significantly reduces oil viscosity, increases oil mobility and enhances oil production rate. Accurate simulation of thermal oil recovery requires simultaneous consideration of flow, thermal and mechanical processes. As it has been mentioned by Shafiei

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Correspon ing 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  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.169