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porothermoelasticity
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Modeling of Wellbore Stability in Shales including Proelsatic, Chemical and Thermal Effects
, M.Sc. Thesis Sharif University of Technology ; Ghotbi, Sirous (Supervisor) ; Pishvaie, Mahmoud Reza (Supervisor)
Abstract
Wellbore instability is one of the serious problems during drilling. This can cause delay in drilling, increasing drilling costs and in some cases well abandonment. The present project investigates the effects of non- isothermal drilling and the difference in salt concentration between formation fluid and drilling fluid on the stability of wellbores drilled in the saturated porous shale formations subjected to an arbitrary stress field. This project also focuses on the analysis of wellbore stability in shale formations in which the thermal diffusivity is higher than fluid invasion and the mechanism of heat transfer is dominated by conduction. The governing equations used in this dissertation...
Asymmetric mechanical and thermal stresses in 2D-FGPPMs hollow cylinder
, Article Journal of Thermal Stresses ; Volume 40, Issue 4 , 2017 , Pages 448-469 ; 01495739 (ISSN) ; Firoozbakhsh, K ; Jabbari, M ; SelkGhafari, A ; Sharif University of Technology
Taylor and Francis Ltd
2017
Abstract
The general solution of steady-state asymmetric mechanical and thermal stresses of a hollow thick cylinder made of fluid-saturated functionally graded porous piezoelectric materials based on two-dimensional equations of thermoelasticity is considered. The general form of thermal and mechanical boundary conditions is considered on the inside and outside surfaces. A direct method is used to solve the heat conduction equation and the nonhomogeneous system of partial differential Navier equations, using the complex Fourier series and the power law functions method. The material properties are assumed to depend on the radial and circumferential variables and are expressed as power law functions...