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09445 A Multi-Electrode Approach to Evaluating Inhibition of Underdeposit Corrosion in CO2 Environments

Picture for 09445 A Multi-Electrode Approach to Evaluating Inhibition of Underdeposit Corrosion in CO2 Environme
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Product Number: 51300-09445-SG
ISBN: 09445 2009 CP
Author: Gareth Hinds, Shengqi Zhou, Alan Turnbull and Phil Cooling
Publication Date: 2009
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A multi-electrode array consisting of 24 carbon steel electrodes encased in epoxy has been used to evaluate inhibitors for control of underdeposit corrosion in the oil and gas industry. The electrode array enables examination of the effect of varying degrees of pre-corrosion during a single test and also statistical variation in electrode response. The array is mounted in a cup under sand (simulated field deposit) and coupled to an external carbon steel electrode in such a way that the galvanic corrosion current at each electrode can be monitored. The test method was demonstrated on two different inhibitors exposed to a simulated field brine under sweet (CO2) conditions. The adoption of the multi-electrode array highlighted the importance of statistical variations in determining the worst-case corrosion rate, which might otherwise not be identified in conventional tests.

Keywords: inhibition, underdeposit corrosion, multi-electrode
A multi-electrode array consisting of 24 carbon steel electrodes encased in epoxy has been used to evaluate inhibitors for control of underdeposit corrosion in the oil and gas industry. The electrode array enables examination of the effect of varying degrees of pre-corrosion during a single test and also statistical variation in electrode response. The array is mounted in a cup under sand (simulated field deposit) and coupled to an external carbon steel electrode in such a way that the galvanic corrosion current at each electrode can be monitored. The test method was demonstrated on two different inhibitors exposed to a simulated field brine under sweet (CO2) conditions. The adoption of the multi-electrode array highlighted the importance of statistical variations in determining the worst-case corrosion rate, which might otherwise not be identified in conventional tests.

Keywords: inhibition, underdeposit corrosion, multi-electrode
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