Corrosion characteristics of transportation pipelines in oil-water emulsion with CO2:A review
The multiphase transport pipelines with oil and water are extremely susceptible to internal corrosion in the acidic environment with CO2,which has become one of the key issues limiting the development of CO2 capture and storage by the enhanced oil recovery technology.At present,the study of CO2 corrosion behavior in oil-water system has become a hot issue widely focused on the field of pipeline safety and low carbon technology.Focusing on CO2 corrosion behavior of steel in oil-water system,this paper summarized the behavior characteristics and research methods of CO2 corrosion and compared the advantages and disadvantages of the commonly used experimental research apparatus and the characterization methods of corrosion rate.In addition,the effects of flow conditions,composition of water phase,water cut and stability of emulsion,flow pattern and corrosion product film on CO2 corrosion behavior and the development of corrosion rate model in oil-gas-water multiphase environment were systematically described.Overall,the qualitative analysis and quantitative characterization of the CO2 corrosion factors in oil-water systems are gradually deepening.However,the correlation of the composition of oil phase and the microscopic morphology of emulsion with the corrosion rate is still unclear.In situ data collection can be carried out by coupling micro-instruments such as Focused Beam Reflectance Measurement in the existing macro apparatus.The effects of crude oil composition,interfacial wettability properties,emulsion microstructure and reversed-phase point on the CO2 corrosion rate and film properties should be investigated.A general corrosion rate mechanism model considering the oil phase and emulsion characteristics are supposed to be established and gradually applied to engineering practice.
CO2 corrosionwater-oil emulsioncorrosion rategathering pipelineexperimental research
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