Quantifying the acetate-enhanced corrosion of carbon steel in oilfield brines
Quantifying the acetate-enhanced corrosion of carbon steel in oilfield brines
The rare of corrosion of X65 carbon steel in oilfield brines containing carbon dioxide (CO2) is increased by the presence of acetate (or anions of other weak acids) in the brine. It is confirmed that the increase in corrosion rate may be correlated with the equilibrium concentration of acetic acid (HOAc) in the brine and this may be calculated provided the full brine composition is known. It is. however, essential to take into account the ionic strength of the brine. the bicarbonate present. the partial pressure of CO2. and the temperature, as well as the acetate concentration. Moreover. it is shown that the role of acetic acid is as a reactant in the cathodic processes contributing to corrosion: acetic acid. a proton donor, as well as free proton, reduces to give hydrogen gas. Calculation of the relative rates of all possible cathodic reactions at the corrosion potential leads to the conclusion that acetate-enhanced corrosion will be a potential hazard when the equilibrium concentration of acetic acid in the brine is >1 mM (60 ppm). This has been confirmed experimentally.
acetate, bicarbonate, carbon dioxide, curbon steel, oilfield brines, steel corrosionsteady-state voltammetry, weak acids, hydrogen evolution, dioxide, microelectrodes
1155-1167
Garsany, Y.
d8c08794-453b-42f3-97b1-0a2ec0332667
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Sidorin, D.
a993e261-e1b5-4059-bfb3-f0f8cd673a13
Hedges, W.M.
646f617e-ad35-42c2-836a-6b0a4f096770
1 December 2004
Garsany, Y.
d8c08794-453b-42f3-97b1-0a2ec0332667
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Sidorin, D.
a993e261-e1b5-4059-bfb3-f0f8cd673a13
Hedges, W.M.
646f617e-ad35-42c2-836a-6b0a4f096770
Garsany, Y., Pletcher, D., Sidorin, D. and Hedges, W.M.
(2004)
Quantifying the acetate-enhanced corrosion of carbon steel in oilfield brines.
National Association of Corrosion Engineers International: Corrosion Journal, 60 (12), .
Abstract
The rare of corrosion of X65 carbon steel in oilfield brines containing carbon dioxide (CO2) is increased by the presence of acetate (or anions of other weak acids) in the brine. It is confirmed that the increase in corrosion rate may be correlated with the equilibrium concentration of acetic acid (HOAc) in the brine and this may be calculated provided the full brine composition is known. It is. however, essential to take into account the ionic strength of the brine. the bicarbonate present. the partial pressure of CO2. and the temperature, as well as the acetate concentration. Moreover. it is shown that the role of acetic acid is as a reactant in the cathodic processes contributing to corrosion: acetic acid. a proton donor, as well as free proton, reduces to give hydrogen gas. Calculation of the relative rates of all possible cathodic reactions at the corrosion potential leads to the conclusion that acetate-enhanced corrosion will be a potential hazard when the equilibrium concentration of acetic acid in the brine is >1 mM (60 ppm). This has been confirmed experimentally.
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Published date: 1 December 2004
Keywords:
acetate, bicarbonate, carbon dioxide, curbon steel, oilfield brines, steel corrosionsteady-state voltammetry, weak acids, hydrogen evolution, dioxide, microelectrodes
Organisations:
Chemistry
Identifiers
Local EPrints ID: 20808
URI: http://eprints.soton.ac.uk/id/eprint/20808
ISSN: 0010-9312
PURE UUID: 1ec2ead7-306e-4fec-ab98-543f5d414f80
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Date deposited: 01 Mar 2006
Last modified: 08 Jan 2022 09:50
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Contributors
Author:
Y. Garsany
Author:
D. Sidorin
Author:
W.M. Hedges
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