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Exploring CO2 Annular Corrosion In Flexible Pipes At Different Pressures

Product Number: 51321-16796-SG
Author: Maira Eleni Mitzithra; John Rothwell; Shiladitya Paul; Fabricio Pinheiro dos Santos
Publication Date: 2021
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This paper presents in situ pH and corrosion rate results obtained from the tests carried out at 20bar CO2, for flexible wire material, in 3.5% NaCl, at 30°C, 40°C and 60°C with a CO2 gas flow rate of 0.001ml/min/cm2, a V/S ratio of 1ml/cm2 and a duration of 2 months. These are compared with tests at 40 barg CO2, presented in previously published work, and tests at 1barg CO2, 5barg CO2 and 10barg CO2 for similar annular test conditions. In general, the pH and corrosion behaviour were related to dissolved iron concentration, precipitation kinetics and scale formation on the surface of the specimens. The lowest corrosion rate was recorded for the test with the lowest V/S and CO2 flux which featured a thin and compact iron carbonate layer. For a given V/A ratio and CO2 flux, changes in the long term in­ situ pH and corrosion rates were found to become less significant as CO2 increases beyond 20barg and temperatures increase beyond 40°C. Different carbonated morphologies were apparent and related to the test conditions.

This paper presents in situ pH and corrosion rate results obtained from the tests carried out at 20bar CO2, for flexible wire material, in 3.5% NaCl, at 30°C, 40°C and 60°C with a CO2 gas flow rate of 0.001ml/min/cm2, a V/S ratio of 1ml/cm2 and a duration of 2 months. These are compared with tests at 40 barg CO2, presented in previously published work, and tests at 1barg CO2, 5barg CO2 and 10barg CO2 for similar annular test conditions. In general, the pH and corrosion behaviour were related to dissolved iron concentration, precipitation kinetics and scale formation on the surface of the specimens. The lowest corrosion rate was recorded for the test with the lowest V/S and CO2 flux which featured a thin and compact iron carbonate layer. For a given V/A ratio and CO2 flux, changes in the long term in­ situ pH and corrosion rates were found to become less significant as CO2 increases beyond 20barg and temperatures increase beyond 40°C. Different carbonated morphologies were apparent and related to the test conditions.

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