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Poroelastoplastic Modeling of Borehole Stability
The stability of boreholes is a major concern in petroleum and geotechnical engineering. Rock is a porous material and the presence of freely moving fluid modifies the mechanical response of a rock. This mechanical response is characterized by fully coupled deformation-diffusion behavior. Instability of boreholes near the borehole walls are a common occurrence and an analysis of this phenomenon depends highly on the constitutive model adopted to describe the behavior of the solid matrix. Linear elastic models are well known and have been extensively applied in practice. However, the behavior near the borehole walls is likely to be elastoplastic in nature with accompanying shear induced volumetric strains (dilation and compaction). A fully coupled, poroelastoplastic, plane strain finite element code, TeraBHStabl, specifically developed for borehole stability problems is presented to study the fluid-saturated rocks. A bounding surface elastoplastic constitutive model is used to predict the elastoplastic nature of the porous rock near the borehole wall. The stresses predicted by TeraBHStabl can be utilized to identify the failure zones around the borehole by incorporating rock failure criteria. These stress predictions are helpful to gain insight into loading conditions that require poroelastoplastic modeling of rocks for borehole stability problems.
Poroelastoplastic Modeling of Borehole Stability
The stability of boreholes is a major concern in petroleum and geotechnical engineering. Rock is a porous material and the presence of freely moving fluid modifies the mechanical response of a rock. This mechanical response is characterized by fully coupled deformation-diffusion behavior. Instability of boreholes near the borehole walls are a common occurrence and an analysis of this phenomenon depends highly on the constitutive model adopted to describe the behavior of the solid matrix. Linear elastic models are well known and have been extensively applied in practice. However, the behavior near the borehole walls is likely to be elastoplastic in nature with accompanying shear induced volumetric strains (dilation and compaction). A fully coupled, poroelastoplastic, plane strain finite element code, TeraBHStabl, specifically developed for borehole stability problems is presented to study the fluid-saturated rocks. A bounding surface elastoplastic constitutive model is used to predict the elastoplastic nature of the porous rock near the borehole wall. The stresses predicted by TeraBHStabl can be utilized to identify the failure zones around the borehole by incorporating rock failure criteria. These stress predictions are helpful to gain insight into loading conditions that require poroelastoplastic modeling of rocks for borehole stability problems.
Poroelastoplastic Modeling of Borehole Stability
Kirupakaran, Karrthik (author) / Muraleetharan, K. K. "Muraleei" (author) / Abousleiman, Younane N. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 3342-3351
2012-03-29
Conference paper
Electronic Resource
English
Poroelastoplastic Modeling of Borehole Stability
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