Abstract

MAYORGA-RIBERO, Karina Andrea; GAMBUS-ORDAZ, Maika Karen; PALENCIA-MUNOZ, Miguel Fernando  and  SUAREZ-ARIAS, Diego Fernando. Numerical modeling to evaluate tensile mechanical and shear failure of cement in the casing-cement interface. Dyna rev.fac.nac.minas [online]. 2022, vol.89, n.221, pp.41-49.  Epub Aug 26, 2022. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v89n221.98464.

This paper proposes the development of a 3D numerical model of the casing-cement-formation system to evaluate the mechanical tensile and shear failure of the cement at the casing-cement interface as the pressure and temperature conditions of the formation and borehole vary during production. The numerical model which includes the formation pressure, unlike others proposed, was designed by stages under finite element discretization and validated by analytical models. Results show that increasing the formation temperature increases the probability of tensile and shear failure in the cement, while increasing the wellbore temperature decreases these probabilities. On the other hand, the decrease in the well pressure reduces the probability of shear failure and increases the tensile failure. In the case of formation pressure, the opposite occurs.

Keywords : cement; stress; mechanical failure; shear failure; tension failure; numerical model; finite elements.

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