Modelagem numérica da interface tubulação/revestimento em poços de petróleo

Abstract

Oil has become one of the greater sources of energy in the contemporary world and ensures that its extraction is done without loss of production wells and structurally reliable is essential. Cementitious coatings of oil wells are used in order to ensure structural support of the wells and corrosion protection. In these structures, the adhesion between steel and cementitious material is responsible for ensuring the mechanical and the thermodynamical efficiencies, protecting them against corrosion, preventing the escape of fluids inside and isolating the hydraulic structure against infiltrations. The push-out test is used to measure the adherence between steel and cement. In this work, the numerical simulation of steel-cement interface was carried. For reproducing the mechanical behavior of this interface, a cohesive-zone model, formulated from the perspective of Damage Mechanics, combined with Coulomb's law for friction were used. The proposed model was implemented in CAST3M software. The numerical results obtained with the proposed model were compared with experimental results of push-out tests made with three different interface conditions. The comparison between the force versus displacement curves obtained experimentally and numerically validated the proposed model.