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Finite element analysis for inclined wellbore stability of transversely iso-tropic rock with HMCD coupling based on weak plane strength criterion

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Abstract

The finite element analysis (FEA) technology by hydraulic-mechanical-chemical-damage (HMCD) coupling is proposed in this paper for inclined wellbore stability analysis of water-sensitive and laminated rock, developed basing on the recently established FEA technology for transversely isotropic rock with hydraulic-mechanical-damage (HMD) coupling. The chemical activity of the drilling fluid is considered as phenomenological hydration behavior, the moisture content and parameters of rock considering hydration could be determined with time. The finite element (FE) solutions of numerical wellbore model considering the chemical activity of drilling fluid, damage tensor calculation and weak plane strength criterion for transversely isotropic rock are developed for researching the wellbore failure characteristics and computing the time-dependent collapse and fracture pressure of laminated rock as shale reservoirs. A three-dimensional FE model and elastic solid deformation and seepage flow coupled equations are developed, and the damage tensor calculation technology for transversely isotropic rock are realized by introducing effect of the hydration and the stress state under the current load. The proposed method utilizing weak plane strength criterion fully reflects the strength parameters in rock matrix and weak plane. To the end, an effective and reliable numerically three-step FEA strategy is well established for wellbore stability analysis. Numerical examples are given to show that the proposed method can establish efficient and applicable FE model and be suitable for analyzing the timedependent solutions of pore pressure and stresses, and the evolution region considering the hydration surrounding wellbore, furthermore to compute the collapse cycling time and the safe mud weight for collapse and fracture pressure of transversely isotropic rock.

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Authors and Affiliations

  1. Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China

    YongLiang Wang, Zhuo Zhuang & ZhanLi Liu

  2. Zienkiewicz Centre for Computational Engineering & Energy Safety Research Institute, College of Engineering, Swansea University, Swansea, SA2 8PP, UK

    YongLiang Wang & ChenFeng Li

  3. Drilling Research Institute, China National Petroleum Corporation, Beijing, 100195, China

    HengLin Yang

Authors
  1. YongLiang Wang
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  2. Zhuo Zhuang
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  5. ChenFeng Li
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Correspondence to YongLiang Wang.

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11431_2016_460_MOESM1_ESM.docx

Finite element analysis for inclined wellbore stability of transversely isotropic rock with HMCD coupling based on weak plane strength criterion

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Wang, Y., Zhuang, Z., Liu, Z. et al. Finite element analysis for inclined wellbore stability of transversely iso-tropic rock with HMCD coupling based on weak plane strength criterion. Sci. China Technol. Sci. 60, 624–637 (2017). https://doi.org/10.1007/s11431-016-0460-2

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