The contact is more prone to relative slip and cracking when tangential displacement reaches its maximum at 0° and 180°, when normal constraint is weakest and frictional resistance is low. The interface is heavily squeezed at 90° because of the greater horizontal primary stress resulting in the smallest tangential displacement. The total tangential displacement exhibits an increasing trend as the cement sheath elastic modulus rises.
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Peridynamics-Based Finite Element Analysis of Sealing Failure at Casing-Cement Sheath Interfaces in Ultra-Deep Wells.
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