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03324 THE ROLE OF ACETATE IN CO2 CORROSION OF CARBON STEEL STUDIES RELATED TO OILFIELD CONDITIONS

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Product Number: 51300-03324-SG
ISBN: 03324 2003 CP
Author: Yannick Garsany, Derek Pletcher, Bill Hedges
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The influence of acetate ion on the rate of corrosion of carbon steel (X65) in oilfield brines also containing CO2 has been investigated using voltammetry at rotating disc electrodes. It is demonstrated that the speciation of the brine is a major factor and it is shown that the rate of corrosion of the steel is largely determined by the concentration of undissociated acetic acid in the brine. This arises because the proton donor, as well as the free proton, is a reactant in the cathodic reaction leading to corrosion and the concentration of acetic acid is usually significantly higher than that of the free proton in the brines. In laboratory simulated brines containing only NaCl and NaOAc saturated with CO2, the pH and the concentration of acetic acid is a function only of the acetate concentration and hence there is a direct relationship between the corrosion rate and the acetate content of the simulated brine. In real oilfield brines, the situation is more complex. Other species in the brine, particularly HCO3 - , can influence the pH and, hence, the concentration of acetic acid; predicting the corrosion rate then requires more extensive information about the composition. The role of carbonic acid, bicarbonate and carbon dioxide as potential proton donors is also discussed and it is concluded that with > 1 mM OAc - , the current density for acetic acid reduction will dominate the current density for the reduction of all other species. Keywords: Carbon dioxide, acetate, carbon steel corrosion, voltammetry, oilfield brines.
The influence of acetate ion on the rate of corrosion of carbon steel (X65) in oilfield brines also containing CO2 has been investigated using voltammetry at rotating disc electrodes. It is demonstrated that the speciation of the brine is a major factor and it is shown that the rate of corrosion of the steel is largely determined by the concentration of undissociated acetic acid in the brine. This arises because the proton donor, as well as the free proton, is a reactant in the cathodic reaction leading to corrosion and the concentration of acetic acid is usually significantly higher than that of the free proton in the brines. In laboratory simulated brines containing only NaCl and NaOAc saturated with CO2, the pH and the concentration of acetic acid is a function only of the acetate concentration and hence there is a direct relationship between the corrosion rate and the acetate content of the simulated brine. In real oilfield brines, the situation is more complex. Other species in the brine, particularly HCO3 - , can influence the pH and, hence, the concentration of acetic acid; predicting the corrosion rate then requires more extensive information about the composition. The role of carbonic acid, bicarbonate and carbon dioxide as potential proton donors is also discussed and it is concluded that with > 1 mM OAc - , the current density for acetic acid reduction will dominate the current density for the reduction of all other species. Keywords: Carbon dioxide, acetate, carbon steel corrosion, voltammetry, oilfield brines.
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02273 THE ROLE OF ACETATE IN CO2 CORROSION OF CARBON STEEL: HAS THE CHEMISTRY BEEN FORGOTTEN?

Product Number: 51300-02273-SG
ISBN: 02273 2002 CP
Author: Yannick Garsany, Derek Pletcher, and Bill Hedges
Publication Date: 2003
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The influence of acetate ion on the rate of corrosion of carbon steel (X65) in 3 % NaCl brine saturated with carbon dioxide has been investigated using voltammetry at a rotating disc electrode. The rate of corrosion can only be understood if it is recognised that the cathodic process in the steel corrosion is affected by acetic acid.
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