Corrosion evaluation of an AISI-SAE 1020 steel under conditions of brine CO2-H2S multiphase fow

Abstract

Abstract

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 frst 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 corro- sion rate was determined on steel AISI 1020, as well as, the mass transfer

coeffcients 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 infuence the mechanism of deterioration

of steel AISI 1020. This behavior was strongly infuenced by the variation

of the electrode speed, the temperature and pH.