51312-01683-Corrosion of Carbon Steel in High CO2 Containing Environments - the Effect of High Flow Rate

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Product Number: 51312-01683-SG

ISBN: 01683 2012 CP

Author: Azmi Mohammed Nor

Publication Date: 2012

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The need to explore and develop hydrocarbon gas fields which contain high CO2 contents (up to 80 mole %) demands a new prediction model that would adapted to a high partial pressure CO2 environment that could include supercritical phase. Such demand arises from the fact that the existing prediction models are valid up to 20 bars. Not only will the new model address the non-ideality of gas phase in its water-chemistry but also include flow effects. In the previous study flow-sensitive CO2 corrosion was investigated using a high-pressure high-temperature (HPHT) rotating cylinder electrode (RCE) autoclave via weight loss and electrochemical methods at various pH’s (3 to 5) temperatures (25 to 50°C) near critical and supercritical CO2 partial pressures and at fluid velocities from 0 to 1.0 m/s.In the present study a HPHT thin channel flow cell (TCFC) was employed to study further the flow-sensitive CO2 corrosion in near critical and supercritical CO2 partial pressures. The corrosion rate was correlated with that from HPHT rotating cylinder electrode (RCE) autoclave tests by the similarity solution method. This was to ascertain the geometry-independent corrosion rates. Experiments at a higher fluid velocity (8 m/s) were also carried out to establish flow effects on the formation of ferrous carbonate layer.