Promising Directions for Research into Internal Corrosion of Gas Pipelines in Carbon Dioxide Environments

 The problem of combating internal corrosion is relevant at gas facilities in the conditions of production and transportation of hydrocarbons with the presence of aggressive CO₂.The article discusses the main conditions for the occurrence of carbon dioxide corrosion in a gas pipeline, the operating conditions of which will differ from oil fields (the degree of filling of the pipe space with the liquid phase and the aggregate state of the main produced fluids - oil and gas/gas condensate).This will influence corrosion manifestations, which requires special consideration and approach to modeling corrosion tests for gas pipeline conditions.

The study of corrosion processes that occur during transportation of gas with the presence of a liquid phase through a gas pipeline served as the basis for the development of two corrosion stands that allow for simulation tests under carbon dioxide corrosion conditions characteristic of the main gas fields of the Russian Federation. With their help, the most intense corrosion effects are reproduced, corresponding to the parameters and modes of movement of gas-liquid media: liquid circulation and variable wetting of the gas pipeline wall, which lead to the prevention of the formation or destruction of films of corrosion products, which causes the formation of general and local corrosion damage on steel.

The ability to reproduce on both corrosion stands the nature of the movement of the liquid phase, thermobaric conditions and the chemical composition of water corresponding to real environments makes it possible to simulate in the laboratory dynamic corrosion conditions inside the gas pipeline of the production and transportation facilities of untreated gas of PJSC Gazprom. In test stands, the main parameters that influence internal carbon dioxide corrosion are set and regulated: temperature, partial pressure of carbon dioxide, mineral composition of the aqueous phase or dynamic conditions for the transfer of liquid phase flow through a pipeline.

An analysis of the corrosion products obtained after testing using electron scanning microscopy and X-ray diffraction methods made it possible to establish the influence of corrosion conditions on the morphology of their formation.

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