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11063 Understanding and Quantifying Corrosion of L80 Carbon Steel in Sour Environments

Picture for 11063 Understanding and Quantifying Corrosion of L80 Carbon Steel in Sour Environments
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Product Number: 51300-11063-SG
ISBN: 11063 2011 CP
Author: Wei Sun, Dylan V. Pugh, Jorge L. Pacheco, Rob S. Nisbet, Nazri M. Nor, M. Scott Kersey, Leozarin B.
Publication Date: 2011
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$20.00
$20.00
The prediction of carbon steel corrosion in sour acid gas environment is more challenging than that in sweet acid gas environments, because in the former environments various iron sulfide scales can form that result in different corrosion mechanisms. A unique approach was developed to study the complex sour acid gas corrosion behavior, which combined the use of long-term corrosion testing data, facility life prediction data obtained from extreme value statistics method (EVS), and validation with long-term field caliper data. This approach was used to evaluate the applicability of carbon steel for downhole tubing in sour acid gas environments, in order to achieve optimum capital expenditure and long-term facilities integrity.

The effects of three key parameters on L80 carbon steel tubing corrosion were investigated. These parameters were H2S concentration, chloride level, and test duration. Laboratory data combining EVS method were used to predict the tubing life, which were then compared with field caliper inspection data. This comparison showed that predictions based on long-duration laboratory data were consistent with the available field caliper data. It also indicated that field caliper inspection data provided reliable information for tubing life predictions, which complemented mechanistic understanding from laboratory studies.

Keywords: iron sulfide, scale, carbon steel, H2S corrosion, chloride
The prediction of carbon steel corrosion in sour acid gas environment is more challenging than that in sweet acid gas environments, because in the former environments various iron sulfide scales can form that result in different corrosion mechanisms. A unique approach was developed to study the complex sour acid gas corrosion behavior, which combined the use of long-term corrosion testing data, facility life prediction data obtained from extreme value statistics method (EVS), and validation with long-term field caliper data. This approach was used to evaluate the applicability of carbon steel for downhole tubing in sour acid gas environments, in order to achieve optimum capital expenditure and long-term facilities integrity.

The effects of three key parameters on L80 carbon steel tubing corrosion were investigated. These parameters were H2S concentration, chloride level, and test duration. Laboratory data combining EVS method were used to predict the tubing life, which were then compared with field caliper inspection data. This comparison showed that predictions based on long-duration laboratory data were consistent with the available field caliper data. It also indicated that field caliper inspection data provided reliable information for tubing life predictions, which complemented mechanistic understanding from laboratory studies.

Keywords: iron sulfide, scale, carbon steel, H2S corrosion, chloride
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Picture for 10278 A Parametric Study of Sour Corrosion of Carbon Steel
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10278 A Parametric Study of Sour Corrosion of Carbon Steel

Product Number: 51300-10278-SG
ISBN: 10278 2010 CP
Author: Wei Sun, Dylan V. Pugh, Stephen N. Smith, Shiun Ling, Jorge L. Pacheco and Robert J. Franco
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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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