Abstract
At the present stage of gas field development, the products of many mining facilities have increased content of corrosive CO2 . The corrosive effect of CO2 on steel equipment and pipelines is determined by the conditions of its use. CO2 has a potentially wide range of usage at oil and gas facilities for solving technological problems (during production, transportation, storage, etc.). Simulation tests and analysis were carried out to assess the corrosion effect of CO2 on typical steels (carbon, low-alloy and alloyed) used at field facilities. Gas production facilities demonstrate several corrosion formation zones: lower part of the pipe (when moisture accumulates) and top of the pipe (in case of moisture condensation). The authors have analyzed the main factors influencing the intensity of carbon dioxide corrosion processes at hydrocarbon production with CO2 , its storage and use for various technological purposes. The main mechanism for development of carbon dioxide corrosion is presence/condensation of moisture, which triggers the corrosion process, including the formation of local defects (pits, etc.). X-ray diffraction was used for the analysis of corrosion products formed on the steel surface, which can have different protective characteristics depending on the phase state (amorphous or crystalline).
Highlights
The main condition for corrosion process development is the presence of moisture when reactions of its interaction with steel in the solution volume (BOL) or in a thin film of moisture on steel (TOL) occur
TOL corrosion in contrast to the corrosive conditions of oil facilities is typical for gas fields
Water vapor in the gas phase condenses on the pipe inner surface due to the temperature difference between the wet gas flow and the environment, which leads to the appearance and TOL corrosion development
Summary
Диоксид углерода имеет потенциально широкий спектр использования на нефтегазовых объектах для решения технологических задач (при добыче, транспортировке, хранении и др.). Проанализированы основные факторы, влияющие на интенсивность процессов углекислотной коррозии в условиях добычи, хранения и использования углеводородов с СО2 для различных технологических целей. Among the most commonly used are the use of CO2 to intensify oil or gas production at the later stages of field exploitation and as a buffer gas in underground gas storage (UGS) facilities [5] It should be mentioned about the injection of excess CO2 into underground storage facilities in order to reduce its emissions into the environment [6 – 7]. The most dangerous forms of local defects typical for CDC will develop In this regard, the article discusses topical issues of assessing the corrosiveness of carbon dioxide media and the resistance of various steels in the conditions of CDC at oil and gas facilities
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