Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field)
The paper considers borehole wall stability in a junction zone of coaxial wells where a borehole of bigger diameter connects with a smaller one. To determine the shapes and character of rock destruction, 3D poroelastic modeling of the stressed state of the rock around the coaxial junction with accou...
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ftdoajarticles:oai:doaj.org/article:b8d2168e2a024829b88df0970642e251 2023-05-15T17:02:56+02:00 Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) Alexander V. Seryakov Maxim Yu. Podberezhny Oleg B. Bocharo Marat A. Azamatov 2020-09-01T00:00:00Z https://doi.org/10.18599/grs.2020.3.69-78 https://doaj.org/article/b8d2168e2a024829b88df0970642e251 EN RU eng rus Georesursy Ltd. https://geors.ru/archive/article/1054/ https://doaj.org/toc/1608-5043 https://doaj.org/toc/1608-5078 doi:10.18599/grs.2020.3.69-78 1608-5043 1608-5078 https://doaj.org/article/b8d2168e2a024829b88df0970642e251 Georesursy, Vol 22, Iss 3, Pp 69-78 (2020) 3d poroelastic modeling coaxial junction vertical and inclined well anisotropy rock failure sandstone reservoir Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.18599/grs.2020.3.69-78 2023-01-08T01:28:05Z The paper considers borehole wall stability in a junction zone of coaxial wells where a borehole of bigger diameter connects with a smaller one. To determine the shapes and character of rock destruction, 3D poroelastic modeling of the stressed state of the rock around the coaxial junction with account for mudcake formation was performed. The geomechanical model considers the anisotropy of the medium’s deformation properties that are characteristic for the coastal-marine reservoirs of Western Siberia. The rock failure is estimated based on the Mohr-Coulomb criterion with account for tensile destruction condition. The paper considers cases of vertical and inclined junctions of a well drilled at a depth of 2 km in sandstone productive pay with known poroelastic anisotropic properties. The stress and pore pressure analysis has been performed for a mud pressure drop range from 1 to 70 atm and coaxial junctions with different combinations of borehole diameters. The safe mud pressure window has been determined for vertical and inclined junctions. It has been found that the rock failure pattern for junction of bigger diameters is, in general, similar to that for smaller diameters with some insignificant differences in the destruction areas shapes. It has also been demonstrated that in vertical junctions, the bottom holes of smaller diameter are more stable to reduced drilling-mud pressure than the mainboreholes, while in the inclined junction it is the mainwellbore that is more stable to increased drilling-mud pressure than the bottom hole. Article in Journal/Newspaper khanty khanty-mansi Mansi Siberia Directory of Open Access Journals: DOAJ Articles Georesursy 22 3 69 78 |
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topic |
3d poroelastic modeling coaxial junction vertical and inclined well anisotropy rock failure sandstone reservoir Geology QE1-996.5 |
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3d poroelastic modeling coaxial junction vertical and inclined well anisotropy rock failure sandstone reservoir Geology QE1-996.5 Alexander V. Seryakov Maxim Yu. Podberezhny Oleg B. Bocharo Marat A. Azamatov Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
topic_facet |
3d poroelastic modeling coaxial junction vertical and inclined well anisotropy rock failure sandstone reservoir Geology QE1-996.5 |
description |
The paper considers borehole wall stability in a junction zone of coaxial wells where a borehole of bigger diameter connects with a smaller one. To determine the shapes and character of rock destruction, 3D poroelastic modeling of the stressed state of the rock around the coaxial junction with account for mudcake formation was performed. The geomechanical model considers the anisotropy of the medium’s deformation properties that are characteristic for the coastal-marine reservoirs of Western Siberia. The rock failure is estimated based on the Mohr-Coulomb criterion with account for tensile destruction condition. The paper considers cases of vertical and inclined junctions of a well drilled at a depth of 2 km in sandstone productive pay with known poroelastic anisotropic properties. The stress and pore pressure analysis has been performed for a mud pressure drop range from 1 to 70 atm and coaxial junctions with different combinations of borehole diameters. The safe mud pressure window has been determined for vertical and inclined junctions. It has been found that the rock failure pattern for junction of bigger diameters is, in general, similar to that for smaller diameters with some insignificant differences in the destruction areas shapes. It has also been demonstrated that in vertical junctions, the bottom holes of smaller diameter are more stable to reduced drilling-mud pressure than the mainboreholes, while in the inclined junction it is the mainwellbore that is more stable to increased drilling-mud pressure than the bottom hole. |
format |
Article in Journal/Newspaper |
author |
Alexander V. Seryakov Maxim Yu. Podberezhny Oleg B. Bocharo Marat A. Azamatov |
author_facet |
Alexander V. Seryakov Maxim Yu. Podberezhny Oleg B. Bocharo Marat A. Azamatov |
author_sort |
Alexander V. Seryakov |
title |
Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
title_short |
Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
title_full |
Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
title_fullStr |
Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
title_full_unstemmed |
Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field) |
title_sort |
junction zone stability in coaxial wells of different diameters (on the example of the khanty-mansi autonomous district oil field) |
publisher |
Georesursy Ltd. |
publishDate |
2020 |
url |
https://doi.org/10.18599/grs.2020.3.69-78 https://doaj.org/article/b8d2168e2a024829b88df0970642e251 |
genre |
khanty khanty-mansi Mansi Siberia |
genre_facet |
khanty khanty-mansi Mansi Siberia |
op_source |
Georesursy, Vol 22, Iss 3, Pp 69-78 (2020) |
op_relation |
https://geors.ru/archive/article/1054/ https://doaj.org/toc/1608-5043 https://doaj.org/toc/1608-5078 doi:10.18599/grs.2020.3.69-78 1608-5043 1608-5078 https://doaj.org/article/b8d2168e2a024829b88df0970642e251 |
op_doi |
https://doi.org/10.18599/grs.2020.3.69-78 |
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Georesursy |
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69 |
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78 |
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