Abstract

PENA BALLESTEROS, Darío Yesid; PEDRAZA TORRES, Sandra Rocío  and  VASQUEZ QUINTERO, Custodio. Corrosion evaluation of an AISI-SAE 1020 steel under conditions of brine CO₂-H₂S multiphase flow. Ing. Desarro. [online]. 2010, n.27, pp.187-214. ISSN 0122-3461.

The corrosion by CO₂/ H₂S in gas and petroleum production represents one of the most important areas of research, due to the necessity to evaluating the severity of corrosion and thus to decrease the risk of operation problems and in addition the decrease of effective costs of production. In Colombia, the researchers have been oriented to the study of CO₂ corrosion, although in the country production can appear traces of H₂S, which are potentially harmful for the materials of the hydrocarbon transporting pipelines. In this first part, the steel in a multiphase system containing brine-CO₂-H₂S was evaluated. To carry out this research, the concentrations of CO₂ and H₂S and the hydrodynamics conditions present in the pipelines were simulated in an electrode rotating cylinder. In this geometry, the corrosion rate was determined on steel AISI 1020, as well as, the mass transfer coefficients and viscous layers of the representative species of the system; the morphology of corrosion products formed in these environments was also characterized. This study allowed concluding that the species related to CO₂ (H₂CO₃), are those that influence the mechanism of deterioration of steel AISI 1020. This behavior was strongly influenced by the variation of the electrode speed, the temperature and pH.

Keywords : Multiphase system; CO₂; H₂S; mass transfer coefficients; viscous sub-layer; sub-layer of diffusion shear stress.

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