Destruction mechanisms and methods of laboratory autoclave tests of internal coatings of oil pipes

Yudin, P.E.; Petrov, S.S.; Maximuk, A.V.; Knyazeva, Zhanna

doi:10.1051/e3sconf/201912101009

Cited by 3 publications

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References 4 publications

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“…Polymer powder coatings have been used in the oil and gas industry for more than 30 years [3], but the issues related to the assessment of their durability under expected operating conditions remain relevant [4]. There is an extensive list of tests to determine the quality of polymer coatings and resistance to aggressive conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Kovalev

Alekseeva

Shaposhnikov

et al. 2021

Proceedings of the 1st International Electronic Conference on Metallurgy and Metals

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The use of polymer coatings is one of the most common methods of protecting metal structures from corrosion damage. For example, in the oil and gas industry, polymer coatings are used to protect the inner surfaces of oilfield pipelines. One of the open questions is predicting the life of the selected protective coating. Existing research methods are aimed at assessing the quality of coating application and its behavior under conditions that simulate operational ones, but they do not allow to talk about a guaranteed service life. In this regard, laboratory tests should include tests as close as possible to operational influences in order to identify the deficiencies of the investigated coatings. The paper discusses the methodological features of autoclave testing with a pressure drop for polymer powder coatings. Autoclave tests simulate operating conditions, but the way they are performed can affect the final result. Autoclave decompression tests were carried out in environments containing CO2 and H2S gases. The effects of pressure release rate, temperature and coating quality were evaluated. Methods for assessing the degradation of coatings after testing are considered. The result of the work is a description of the factors that can affect the results of autoclave decompression tests of polymer anticorrosive coatings.

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Section: Introductionmentioning

confidence: 99%

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Kovalev

Alekseeva

Shaposhnikov

et al. 2021

Proceedings of the 1st International Electronic Conference on Metallurgy and Metals

View full text Add to dashboard Cite

show abstract

“…Polymer powder coatings have been used in the oil and gas industry for over 30 years [3], but the issues related to the assessment of their durability under expected operating conditions remain relevant [4]. There is an extensive list of tests to determine the quality of polymer coatings and resistance to aggressive conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Factors Influencing the Autoclave Tests Results of Internal Anticorrosive Polymer Coatings

Kovalev

Alekseeva

Shaposhnikov

et al. 2021

Metals

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Polymer coatings are one of the most common methods for protecting metal structures from corrosion damage. For example, in the oil and gas industry, polymer coatings are used to protect the inner surfaces of oilfield pipelines. Forecasting the service life of the coating is an unsolved problem. Existing test methods allow to assess the quality of coating application and compliance with the declared properties, for example, resistance at a certain temperature, but do not allow to understand the expected service life or degradation dynamics. One solution to this problem may be the development of existing methods of autoclave testing of coatings with the addition of more criteria for assessing degradation. This paper considers the methodological features of autoclave testing with rapid pressure relief. The decompression autoclave test was considered from the point of view of the principles of its conduct and evaluation of test results. The tests were carried out in environments containing hydrogen sulfide and carbon dioxide. The main object of the tests was anticorrosive polymer powder coatings applied in industrial conditions. The work assessed the influence of the following factors on the test result: pressure relief time, test cycle, and coating quality. Attention was also paid to the evaluation methods; aside from the adhesion assessment, optical microscopy and the evaluation of the microhardness of coatings were used. As a result of the work carried out, it was shown that the pressure relief rate within 5 s affects the test results. An increase in micropores and a drop in the microhardness of coatings after cyclic autoclave tests were also shown. The method of assessing the degradation of coatings using microhardness also showed the convergence of the results with the traditional method of assessing adhesion. The results of the work can be used to modify the autoclave testing method and transition to resource forecasting.

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“…Самым важным показателем покрытий является адгезионная прочность полимера с металлической подложкой, зависящая от технологии проведения операций нанесения. Здесь важно качество применяемых материалов, соблюдение правильной технологии подготовки поверхности металла и самого процесса окрашивания, температурных режимов сушки [13]. Наряду с вышеперечисленными требованиями, стабильность защитных свойств полимерного покрытия не всегда зависит от самого покрытия, а определяется также условиями и параметрами эксплуатации [9].…”

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Destruction of Internal Anticorrosive Polymer Coatings of Oilfield Pipes during Operation

Surgaeva,

Yudin,

Amosov

2024

Safety of Technogenic and Natural Systems

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Introduction. Failure of equipment, specifically pipes in the oilfield complex, due to the development of corrosion processes leads to numerous losses, destruction of expensive components, disruption of technological processes and, as a result, environmental damage. The use of anticorrosive coatings as an internal protection of oilfield pipes offers many advantages and can significantly reduce the rate of corrosion, but does not provide a complete solution to this problem. Destruction of internal anticorrosive polymer coatings (IACPC) occurs for numerous reasons. The causes and mechanisms of destruction are insufficiently investigated. Therefore, the aim of this work was to analyze the destruction of internal anticorrosive polymer coatings using practical examples, which made it possible to form and identify the main causes of damage and degradation of coatings during operation.Materials and Methods. A complex of laboratory studies was carried out to study the damage to internal polymer anticorrosive coatings during operation and to establish the main causes of destruction. The initial phase of the investigation involved a detailed examination of the materials related to the accident circumstances, including the operating conditions of the coated pipeline (composition of the operating medium, temperature, pressure, and presence of mechanical impurities), operation time, and type of polymeric material used. The second phase involved laboratory testing of the coating, which included the determination of layer thickness, dielectric continuity, adhesive strength (by the normal separation method), investigation of thermokinetic properties by means of differential scanning callometry (DSC), study of the coating structure using scanning electron microscopy.Results. Practical examples of the destruction of internal anticorrosive coatings of oilfield pipes were analyzed. For each case, characteristic signs of degradation of the anti-corrosive coating were identified. Changes in the microstructure of the coatings, as well as the formation of corrosion products, were observed depending on the type of destruction. The focus was on studying the degree of polymerization of the coating, both using the traditional method of determining the ΔTg parameter using DSC, and based on indirect signs detected during microscopic studies.Discussion and Conclusion. The practical cases of damage to the internal anticorrosion coating of pipes of the oil and gas complex considered in the article allowed us to divide the causes of destruction into three groups: operational, technological and defects during transportation, storage and construction and installation works. Based on these findings, we have formulated recommendations for manufacturers to ensure maximum performance from their coatings. It is noted that the compliance with the presented recommendations makes it possible to obtain internal anticorrosive polymer coatings with a minimum guaranteed lifespan of 15 years, as demonstrated by the successful operations of pipelines in Western Siberia, such as those operated by Surgutneftegaz PJSC and LUKOIL – Western Siberia LLC.

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Destruction mechanisms and methods of laboratory autoclave tests of internal coatings of oil pipes

Cited by 3 publications

References 4 publications

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Investigation of Factors Influencing the Autoclave Tests Results of Internal Anticorrosive Polymer Coatings

Destruction of Internal Anticorrosive Polymer Coatings of Oilfield Pipes during Operation

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