Challenging HPHT and extreme temperature wells are opportunities where increased design efficiency can be crucial. In critical well casing design, accurate assumptions regarding bending stiffness may be necessary to avoid overly-conservative as well as non-conservative analysis. Results predicted include deflection of the casing centerline from the wellbore centerline, effective dogleg curvature, bending deformation, wall contact forces, and bending stress magnification. The FEM represents a fully stiff-string model wherein the casing is approximated by general beam elements with 6 degrees of freedom at each node to account for all possible physical displacements and rotations. A purpose-built finite-element model (FEM) is applied to simulate radial displacement of a casing string constrained within an outer wellbore.
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