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Closed-form solution of stress state and stability analysis of wellbore in anisotropic permeable rocks

Do, D.-P. and Tran, N.-H. and Dang, H.-L. and Hoxha, D. (2019) Closed-form solution of stress state and stability analysis of wellbore in anisotropic permeable rocks. International Journal of Rock Mechanics and Mining Sciences, 113. pp. 11-23. ISSN 13651609

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Abstract

This work aims to develop a closed-form solution of stress state around wellbore drilled in the anisotropic permeable rocks taking into account the transient effect of fluid flow. For this purpose, a simplified method was adopted to solve the anisotropic hydraulic diffusion equation. Knowing the explicit transient evolution of pore pressure, the hydraulic and hydro-mechanical potentials were proposed through which stress state around wellbore are determined thanks to the use of the well-known complex potential approach. The validity of this closed-form solution was verified by comparing with the result obtained from the numerical simulation. By combining the analytical solution of stresses on well wall with a chosen anisotropic failure criterion of rock mass, the stability analysis of wellbore was carried out. Through the parametric study, we elucidated the influence of different factors on the safe mud pressure window notably the anisotropic poro-elastic properties, the anisotropic strength of the rock masses as well as the anisotropic initial stress state and the inclined bedding plane of formation. © 2018 Elsevier Ltd

Item Type: Article
Divisions: Institutes > Institute of Techniques for Special Engineering
Identification Number: 10.1016/j.ijrmms.2018.11.002
Uncontrolled Keywords: Anisotropy; Boreholes; Flow of fluids; Oil field equipment; Rocks; Anisotropic strength; Closed form solutions; Permeable rocks; Poro-elastic; Pressure window; Transient flow; Wellbore stability; Rock mechanics; anisotropic medium; computer simulation; drilling; numerical model; permeability; poroelasticity; rock mechanics; stability analysis; stress field; stress measurement; transient flow; well logging
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/9463

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