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作者:

Xi, Yan (Xi, Yan.) | Yao, Yu (Yao, Yu.) | Guo, Xue-Li (Guo, Xue-Li.) | Li, Jun (Li, Jun.) | Tian, Yu-Dong (Tian, Yu-Dong.) | Liu, Gong-Hui (Liu, Gong-Hui.)

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摘要:

A microannulus (MA) is the primary reason for sustained casing pressure in multi-stage fractured-shale gas wells. However, the effect of the casing eccentricity on the long horizontal section has not been considered. In this study, a full-scale integrity tester for cement sheaths is adopted to measure the cumulative plastic deformation. Numerical models are applied to evaluate the development of the cumulative plastic deformation and quantify the MA width considering casing centralization and eccentricity in the context of multiple loading and unloading cycles. Subsequently, the influences of the eccentricity distance and angle, cement-sheath mechanical variables, and different well depths on the cumulative sheath plastic deformation and sheath MA development are explored. The research results demonstrate that casing eccentricity significantly increases the cumulative sheath plastic deformation compared with that of the casing-centered condition. Consequently, the risk of sealing integrity failure increases. The accumulated plastic deformation increases when the eccentricity distance increases. In contrast, the initial plastic deformation increases as the eccentricity angle increases. However, the cumulative plastic deformation decreases after a specific loading and unloading cycle count. Affected by the coupled influence of the internal casing pressure and fracturing stages, the width of the MA in the horizontal section increased from the toe to the heel, and the casing eccentricity significantly increased the MA width at each stage, thus increasing the risk of gas channeling. Finally, an engineering case is considered to study the influence of casing eccentricity. The results show that cement slurries that form low and high elastic moduli can be applied to form a cement sheath when the fracturing stage is lower or higher than a specific value, respectively. The results of this study offer theoretical references and engineering support for the integrity control of cement sheath sealing. (c) 2024 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

关键词:

Casing eccentricity Cement sheath Microannulus Numerical simulation

作者机构:

  • [ 1 ] [Xi, Yan]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 2 ] [Yao, Yu]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 3 ] [Liu, Gong-Hui]Beijing Univ Technol, Beijing 100124, Peoples R China
  • [ 4 ] [Guo, Xue-Li]CNPC Engn Technol R&D Co Ltd, Beijing 102200, Peoples R China
  • [ 5 ] [Li, Jun]China Univ Petr Beijing Karamay, Karamay 834000, Xinjiang, Peoples R China
  • [ 6 ] [Li, Jun]China Univ Petr, Beijing 102249, Peoples R China
  • [ 7 ] [Tian, Yu-Dong]CNPC Daqing Drilling Engn Corp, Daqing 163311, Heilongjiang, Peoples R China

通讯作者信息:

  • [Xi, Yan]Beijing Univ Technol, Beijing 100124, Peoples R China;;

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来源 :

PETROLEUM SCIENCE

ISSN: 1672-5107

年份: 2024

期: 5

卷: 21

页码: 3428-3445

5 . 6 0 0

JCR@2022

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