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Failure rules of oil-soluble corrosion inhibitor film on horizontal metal surface placed in gas flow field
DU Qiang1,2, TAN Hongqi3
(1.State Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2.Northwest Sichuan Gas Field of Southwest Oil & Gasfield Company, PetroChina, Jiangyou 621709, China;3.PetroChina International Iraq FZE, Beijing 100120, China)
Abstract:
The failure rules of inhibitor film caused by gas flow were discussed. According to the mechanism, the oil-soluble corrosion inhibitor film was approximately divided into two types:film layer with good fluidity and film layer with poor fluidity. Based on the velocity distribution in easily flowing film layer, the thickness variation with the flowing time was analyzed. Based on the molecular concentration diffusion equation, the governing algebraic equations of thickness failure of not-easy-flow film layer were proposed. Considering the interaction of flow and molecular diffusion,the mathematical model describing the failure rate of the oil film was established. The results show that the failure of inhibitor film is determined by both flow and molecular diffusion. The flow of main solvent in inhibitor makes the film thickness decrease rapidly, but the thickness of not easily flowing film layer formed by molecular adsorption decreases slowly. The fitting curve is in agreement with the experimental data.
Key words:  horizontal metal plate  oil-soluble corrosion inhibitor  film  failure rule