Law of corrosion mass transfer in oil and gas pipeline
The corrosion caused by CO2,known as"sweet"corrosion,has become a significant challenge for oil and gas pipelines.Numerous one-dimensional corrosion prediction models have been proposed to forecast and prevent corrosion hazards.However,these models lack consideration of the complex flow within the pipeline.Therefore,a multi-field coupled finite element model was constructed to investigate the mass transfer law of corrosion in pipelines.The comprehensive consideration of chemical reaction,electrochemical corrosion reaction,and corrosion product formation in CO2 aqueous solution was undertaken.The electrochemical corrosion model was integrated with flow calculations to simulate the mass transfer of CO2 corrosion in straight pipe flow.The results indicated that the thickness of the mass transfer boundary layer was less than 1/10 of that of the flow boundary layer,and the presence of flow enhanced the rate of corrosion mass transfer,resulting in a higher flow corrosion rate.The consumption of H+on the pipeline surface was not fully exhausted under flow corrosion,leading to distinct variations in the H+Sherwood number(Sh)with Reynolds number(Re)in corrosion mass transfer at different pH.Considering the actual flow,the study derived an empirical correlation equation for mass transfer to predict flow corrosion in oil and gas pipelines.
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