Abstract
To get the knowledge of local corrosion, thinning is useful for developing targeted inspection plans for pipe components in the oil/gas industry. Aiming at this object, this work presents a computer fluid dynamics (CFD) method to predict CO2 aqueous corrosion in complex fluid domains. The processes involved in CO2 aqueous corrosion, including flow dynamics, mass transfer, chemical reactions, and electrochemical reactions, are modeled and simulated by a commercial CFD software of Fluent V15.0 (Version, manufacturer, city, country). Mass transfer in the straight pipe flow and jet impinging flow are simulated using three low-Reynolds-number turbulent models (Abe–Kondoh–Nagano k − ε model, Change–Hsieh–Chenk k − ε model, and k − ε shear stress transport model). The flow domains are meshed by grids with the first near-wall node at the position at y+ = 0.1. Comparisons between simulations and experimental data show the Abe–Kondoh–Nagano model provides the best predictions of near-wall flow and mass transfer. Thus, it is used to predict CO2 aqueous corrosion. Corrosion rates of dissolved CO2 in straight pipes and a jet impinging are predicted. The predicted corrosion rates are compared with experimental data and results derived from commercial software, Multicorp V5.2.105. The results show that predicted corrosion rates are reasonable. The locations of the highest corrosion rate for a jet impinging system are revealed.
Highlights
CO2 gas in the presence of liquid water is a main cause of corrosion in oil/gas production and transport
Nesic et al [6] presented a mechanistic model for uniform CO2 corrosion with no protective film based on several individual electrochemical reactions, such as hydrogen ion reduction, carbolic acid reduction, water reduction, oxygen reduction, and iron dissolution
The latter is directly related to the mass transfer coefficient, which can be derived from the experience model of Berger and Hau [15]
Summary
CO2 gas in the presence of liquid water is a main cause of corrosion in oil/gas production and transport. The corrosion rate can be calculated from the combination of the active current density and the diffusion-limited current density The latter is directly related to the mass transfer coefficient, which can be derived from the experience model of Berger and Hau [15]. The above models were validated under certain corrosion conditions They are only “point” models since the experience mass transfer coefficient and the turbulent diffusion coefficient in these models are derived from experiments on straight pipes or rotating cylinder systems, where flow is independent of space. Predictions of uniform corrosion for a CO2 solution in straight pipes and a jet impinging geometry are presented and validated with experimental data and results obtained using. This work could be extended to corrosion predictions for domains with complex 3D geometry
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