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00055 Inhibitor Selection for Internal Corrosion Control of Pipelines: Comparison of Rates of General Corrosion and Pitting Corrosion under Gassy-Oil Pipeline Conditions

Picture for 00055 Inhibitor Selection for Internal Corrosion
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Product Number: 51300-00055-SG
ISBN: 00055 2000 CP
Author: S. Papavinasam, R.W. Revie, M. Attard, A. Demoz, H. Sun, J.C. Donini, and K. Michaelian
Industry: Pipelines, Tanks, and Underground Systems
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Field experiments were carried out in a gassy-oil field using two continuous inhibitors, each at four concentrations, 0, 50, 100 and 200 ppm, and two batch inhibitors, each at two concentrations, 0 and 2000 ppm. Laboratory experiments were carried out using 12 different methodologies with the same inhibitors at the same concentrations as used in the field. By comparing the general and pitting corrosion rates in field and laboratory experiments at the same inhibitor concentration, a ranking of laboratory methodologies has been developed. The approaches used to calculate the ranking of the laboratory methodologies were: Comparison of the logarithm of the ratio of the general corrosion rate in the laboratory to that in the field; Comparison of the logarithm of the ratio of the pitting corrosion rate in the laboratory to that in the field; and Comparison of the percent inhibition (calculated from both general corrosion rate and pitting corrosion rate) in the laboratory and in the field. Keywords: Field experiments; rotating cage; rotating cylinder electrode; rotating disk electrode, jet impingement; high-temperature, high-pressure; pitting corrosion; wall shear stress; flow; inhibition.
Field experiments were carried out in a gassy-oil field using two continuous inhibitors, each at four concentrations, 0, 50, 100 and 200 ppm, and two batch inhibitors, each at two concentrations, 0 and 2000 ppm. Laboratory experiments were carried out using 12 different methodologies with the same inhibitors at the same concentrations as used in the field. By comparing the general and pitting corrosion rates in field and laboratory experiments at the same inhibitor concentration, a ranking of laboratory methodologies has been developed. The approaches used to calculate the ranking of the laboratory methodologies were: Comparison of the logarithm of the ratio of the general corrosion rate in the laboratory to that in the field; Comparison of the logarithm of the ratio of the pitting corrosion rate in the laboratory to that in the field; and Comparison of the percent inhibition (calculated from both general corrosion rate and pitting corrosion rate) in the laboratory and in the field. Keywords: Field experiments; rotating cage; rotating cylinder electrode; rotating disk electrode, jet impingement; high-temperature, high-pressure; pitting corrosion; wall shear stress; flow; inhibition.
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