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Role Of Acetic Acid On The Kinetics And Mechanism Of Carbon Steel Dissolution Under CO2 Top Of Line Corrosion

Picture for Role Of Acetic Acid On The Kinetics And Mechanism Of Carbon Steel Dissolution Under CO2 Top Of Line Corrosion
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Top of line corrosion (TLC) is a specific corrosion mechanism observed in the oil and gas industry. This phenomena occurs under stratified or wet-gas flow regimes when the upper internal pipeline walls are sufficiently cooled (by heat transfer to the surrounding outer environment), promoting local condensation of water vapor. Carbon dioxide (CO2) and organic acids dissolving into the condensed water generate a change in the solution chemistry, ultimately influencing the corrosion kinetics of the contacting carbon steel.

Product Number: 51322-17818-SG
Author: Mariana Costa Folena, José Antônio da Cunha Ponciano Gomes, Frederick Pessu, Anne Neville, Richard Barker
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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Based on a review of both literature and field data, it is apparent that the role of acetic acid (HAc) in oilfield brines is both extremely complex and somewhat controversial. Although it is commonly believed that the presence of this organic compound enhances both the general and the localized corrosion rate of carbon steel, HAc has recently been reported to also act as a weak inhibitor in specific aqueous environments. These observations prompted a study into whether such behavior is apparent in a CO2 top of line corrosion (TLC) scenario i.e. when HAc dissolves into condensed water which forms on the upper internal wall of carbon steel pipelines during wet-gas or stratified flow. Four different water condensation rates/temperature TLC conditions were selected to investigate the role of HAc on both the kinetics and mechanism of carbon steel dissolution. A miniature three-electrode setup was developed to characterize the real-time TLC response through the implementation of electrochemical measurements. Surface analysis techniques (microscopy and profilometry) were performed to complement the electrochemical results. Collective consideration of the corrosion response and condensate chemistry indicates that similar effects were observed compared to those reported in the literature in bulk aqueous environments, in that the introduction of HAc can result in either an accentuation or diminution in corrosion rate depending upon the operating conditions. In fact, a decrease in corrosion rate was reported at a surface temperature of 20.5oC and water condensation rate of 0.5 ml/m2.s despite a reduction in condensate pH being generated due to HAc presence.

Based on a review of both literature and field data, it is apparent that the role of acetic acid (HAc) in oilfield brines is both extremely complex and somewhat controversial. Although it is commonly believed that the presence of this organic compound enhances both the general and the localized corrosion rate of carbon steel, HAc has recently been reported to also act as a weak inhibitor in specific aqueous environments. These observations prompted a study into whether such behavior is apparent in a CO2 top of line corrosion (TLC) scenario i.e. when HAc dissolves into condensed water which forms on the upper internal wall of carbon steel pipelines during wet-gas or stratified flow. Four different water condensation rates/temperature TLC conditions were selected to investigate the role of HAc on both the kinetics and mechanism of carbon steel dissolution. A miniature three-electrode setup was developed to characterize the real-time TLC response through the implementation of electrochemical measurements. Surface analysis techniques (microscopy and profilometry) were performed to complement the electrochemical results. Collective consideration of the corrosion response and condensate chemistry indicates that similar effects were observed compared to those reported in the literature in bulk aqueous environments, in that the introduction of HAc can result in either an accentuation or diminution in corrosion rate depending upon the operating conditions. In fact, a decrease in corrosion rate was reported at a surface temperature of 20.5oC and water condensation rate of 0.5 ml/m2.s despite a reduction in condensate pH being generated due to HAc presence.

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01033 CONTROL OF TOP OF LINE CORROSION BY CHEMICAL TREATMENT

Product Number: 51300-01033-SG
ISBN: 01033 2001 CP
Author: Yves M. Gunaltun, Ahmed Belghazi
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Dual Functional Corrosion Inhibitor Design And Testing For Top-Of-Line And Bottom Of Line Corrosion

Product Number: 51322-17787-SG
Author: Larry Chen, Nihal Obeyesekere, Jonathan Wylde, Michael Sim
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TOL corrosion is reported to occur in large diameter wet gas pipeline in stratified flow conditions
due to low fluid velocities1. With increasing distance from the inlet, the wet gas pipeline becomes
cooler as it loses heat to the environment. Such cooling causes water, hydrocarbon, and other
high vapor pressure species to condense on the pipe wall. The upper part of the pipe will
constantly be supplied with freshly condensed water while the less corrosive water saturated
with corrosion products will be drained along the pipe wall to the bottom of the line.
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51316-7274-Inhibition Mechanisms for CO2 Corrosion Mitigation by Amines at the Top-of-the-Line

Product Number: 51316-7274-SG
ISBN: 7274 2016 CP
Author: Zineb Belarbi
Publication Date: 2016
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The principal objective of this work is to investigate and understand the TLC inhibition mechanism in the presence of diethylamine (DEA) and morpholine. In order to determine possible interactions between the tested amines and the steel surface, the surface charge was investigated by determining the potential of zero charge (PZC).
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