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11242 Corrosion of Carbon Steel in High CO2 Environment: Flow Effect

Picture for 11242 Corrosion of Carbon Steel in High CO2 Environment: Flow Effect
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Product Number: 51300-11242-SG
ISBN: 2011 11242 CP
Author: A. Mohammed Nor, M.F. Suhor, M.F. Mohamed, M. Singer and S. Nesic
Publication Date: 2011
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At first glance, the need to explore and develop hydrocarbon gas fields which contain high CO2 contents (up to 80 mole %) would call for the use of expensive corrosion resistant alloys. This would have the potential to render project development costs untenable. An alternative approach would be to evaluate the technical feasibility of using carbon steels. Unlike transportation and sequestration of supercritical CO2, where the amount of water is normally negligible or comes from condensation, field development has to consider the presence of formation water. This water has the potential to contain multiple corrosive species. In addition to the action of such species during carbon steel corrosion, evaluations that involve the effect of flow on corrosion rates are required as flow has the possible effects of challenging the protectiveness of the corrosion product films and increasing the mass transfer rates close to the pipe wall.

In the present study, flow-sensitive CO2 corrosion has been investigated using a high-pressure hightemperature rotating cylinder electrode (RCE) autoclave and a pipe flow loop system. Corrosion rates are measured via weight loss and by electrochemical methods at various pH’s (3 to 5), temperatures (25 to 50°C), near critical and supercritical CO2 partial pressures and at equivalent fluid velocities from 0 to 1.5 m/s.

Keywords: Supercritical CO2, rotating cylinder electrode, flow-sensitive corrosion
At first glance, the need to explore and develop hydrocarbon gas fields which contain high CO2 contents (up to 80 mole %) would call for the use of expensive corrosion resistant alloys. This would have the potential to render project development costs untenable. An alternative approach would be to evaluate the technical feasibility of using carbon steels. Unlike transportation and sequestration of supercritical CO2, where the amount of water is normally negligible or comes from condensation, field development has to consider the presence of formation water. This water has the potential to contain multiple corrosive species. In addition to the action of such species during carbon steel corrosion, evaluations that involve the effect of flow on corrosion rates are required as flow has the possible effects of challenging the protectiveness of the corrosion product films and increasing the mass transfer rates close to the pipe wall.

In the present study, flow-sensitive CO2 corrosion has been investigated using a high-pressure hightemperature rotating cylinder electrode (RCE) autoclave and a pipe flow loop system. Corrosion rates are measured via weight loss and by electrochemical methods at various pH’s (3 to 5), temperatures (25 to 50°C), near critical and supercritical CO2 partial pressures and at equivalent fluid velocities from 0 to 1.5 m/s.

Keywords: Supercritical CO2, rotating cylinder electrode, flow-sensitive corrosion
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