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Inhibiting localized corrosion of carbon steel pipelines in sour service

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Use of corrosion inhibitors (CI) to protect metallic equipment, especially carbon steel pipelines from corrosion has long been an established, effective, economic, and hence globally accepted technique. The oil and gas industry has been using CIs to protect the pipelines under various exposure conditions including sour and sweet services . Complete understanding of corrosion mechanisms under sour conditions and protecting pipeline steel under such conditions has always been a challenging task due to the complexity of such systems.

Product Number: 51323-18833-SG
Author: Anupom Sabhapondit, Aboubakr M Abdullah, Nicholas Laycock, Manoj Gonuguntla, Shimjith Madayi, Tom Bos
Publication Date: 2023
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$20.00
$20.00

Laboratory studies for an asset confirmed no general or localized corrosion of carbon steel exposed to a sour environment with a corrosion inhibitor (CI) under various concentrations of brine at different temperatures. In an extended program, it was investigated if the same CI can protect the welds and the heat affected zones (HAZ) of the pipeline. It was found that at the upper temperature limit, the HAZ was prone to minor localized corrosion and a higher dosage of the CI could effectively prevent it. In the field, the actual residual CI concentration in the aqueous phase was already high enough and thus protected the welded zones preventing corrosion. In some tests, the current between any two among parent, HAZ and weld was measured, and no evidence of galvanic effect was found. Results at low and high wall shear stress conditions generated in autoclaves and a high shear flow loop respectively, were consistent. Test temperatures ranging from 14-75 °C, total dissolved solids (TDS) from 5.7 to 229 g/L and test fluids with and without monoethylene glycol (MEG) were covered in the study. Both Linear Polarization Resistance (LPR) technique and weight loss measurements were used for calculating the corrosion rate (CR).

Laboratory studies for an asset confirmed no general or localized corrosion of carbon steel exposed to a sour environment with a corrosion inhibitor (CI) under various concentrations of brine at different temperatures. In an extended program, it was investigated if the same CI can protect the welds and the heat affected zones (HAZ) of the pipeline. It was found that at the upper temperature limit, the HAZ was prone to minor localized corrosion and a higher dosage of the CI could effectively prevent it. In the field, the actual residual CI concentration in the aqueous phase was already high enough and thus protected the welded zones preventing corrosion. In some tests, the current between any two among parent, HAZ and weld was measured, and no evidence of galvanic effect was found. Results at low and high wall shear stress conditions generated in autoclaves and a high shear flow loop respectively, were consistent. Test temperatures ranging from 14-75 °C, total dissolved solids (TDS) from 5.7 to 229 g/L and test fluids with and without monoethylene glycol (MEG) were covered in the study. Both Linear Polarization Resistance (LPR) technique and weight loss measurements were used for calculating the corrosion rate (CR).

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10278 A Parametric Study of Sour Corrosion of Carbon Steel

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A parametric study of sour corrosion was conducted and is presented in this paper to provide a better understanding of corrosion in sour gas environments. Various parameters that are known to affect the corrosion rate were evaluated and their impacts on corrosion rate are discussed.

 
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