Abstract
Questions of the corrosion inhibitors selection for protection of oil-field pipelines have been studied in the article. Results of research of technological and anticorrosive properties of the corrosion inhibitors in mediums simulating industrial environments are presented. The methodological approaches to selection of the corrosion inhibitors on a stage of laboratory experiments on an example of Kaverdinsky gas-condensate deposites have been described. It was found that all the surfactants tested in the simulated medium of the formation waters show a protective effect of more than 90% with a dosage of 1 g/dm3. It is recommended to use bischofite solution with a mass fraction of 24% MgCl2 and corrosion inhibiting 0.1% КI-1M admixture to protect industrial gas pipelines from carbon dioxide corrosion. This composition provides a degree of corrosion protection to 99.6%. The results of industrial tests confirmed the effectiveness of complex system – bischofite solution with a mass fraction of 24 % MgCl2 and addition of 0.1% KI-1M corrosion inhibitor. The cationic surfactants KI-1M, St, SRK and amphoteric surfactants EM and KAPB effectively protect in simulating medium and provide a degree of protection from carbon dioxide corrosion to 91.2-98.9%.
Highlights
Corrosion is one of the main causes of equipment durability in the oil and gas industry, which causes huge economic losses and environmental damage [1,2,3,4,5,6,7]
Despite the progress made in combating corrosion destruction of gas equipment, more than 3000 failures of hydrocarbon collection systems pipelines because of internal corrosion are recorded annually
Comparative analysis of the data indicates the feasibility of using bischofite solution with a mass fraction of 24% of MgCl2 and the addition of a corrosion inhibitor 0.1% KI-1M for protection of industrial gas pipelines from carbon dioxide corrosion, as long as this system provides a degree of protection against corrosion 99.6% relatively to stimulated medium of formation waters
Summary
Corrosion is one of the main causes of equipment durability in the oil and gas industry, which causes huge economic losses and environmental damage [1,2,3,4,5,6,7]. Industrial pipelines are characterized by a continuous change in costs, phase and chemical composition of the transported products The consequence of this is the instability and unpredictability of corrosive aggressiveness of the environment, localization of corrosion damage both along the route and along the intersection of pipes [14, 15]. The adoption of feasible practices of laboratory tests procedure for cleaning pipelines is shown schematically in Fig. 1 [9, 14, 15]
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