The article presents the results of pilot field tests of the corrosion inhibitor (CI) designated as CI-2. The previously obtained correlation for the presence of CI-2 content in the aqueous phase of transported products from its partition coefficient L under field conditions was tested. It was confirmed that for CI-2 the threshold concentration of partition activation was approximately 25 g/m3. At low concentrations of CI-2 in the aqueous phase, the number of defects in the corrosion control samples visually decreases, while there is a clear stimulation of localized corrosion (LC) on the remaining defects. The effect of a «stockade» was found during the operation of CI-2, expressed in an unstable manifestation of the protective effect of the inhibitor in relation to LC with an increase in the equivalent protective concentration. Increasing the equivalent protective concentration to 110 g/m3 can’t neutralize this effect and ensure the stability of the inhibitor. Corrosion monitoring during field tests, using the double focusing method, enables to fix the ratio of LC on corrosion control samples as an average of 2,5. For one of the oil companies of the West Siberian region, the empirical coefficient of the ratio between maximum LC and average LC is determined to be 2,5-3,0, while the ratio of the rate of LC to the rate of general corrosion is more than 112. To improve the quality of inhibitor protection, it is necessary to use reliable instrumental methods for recording LC. Establishing numerical standards for average and maximum LC rates is essential. It is also important to improve the methodological approaches used in laboratories to select CI with stable effectiveness against LC.
References
1. Yanin E.P., Korroziya kak istochnik zagryazneniya okruzhayushchey sredy (Corrosion as a source of environmental pollution), Moscow: ARSO Publ., 2020, 112 p.
2. Markin A.N., Nizamov R.E., Sukhoverkhov S.V., Neftepromyslovaya khimiya: prakticheskoe rukovodstvo (Oilfield chemistry: A practical guide), Vladivostok: Dal’nauka Publ., 2011, 288 p.
3. Tkacheva V.E., Brikov A.V., Lunin D.A., Markin A.N., Lokal’naya CO2-korroziya neftepromyslovogo oborudovaniya (Localized CO2 corrosion of oilfield equipment), Ufa: Publ. of RN-BashNIPIneft’, 2021, 168 p.
4. Markin A.N., Nizamov R.E., CO2-korroziya neftepromyslovogo oborudovaniya (CO2 corrosion of oilfield equipment), Moscow: Publ. of VNIIOENG, 2003, 188 p.
5. Turdymatov A.A., Abdrakhmanov N.Kh., Abdrakhmanova K.N., Vorokhobko V.V., Efficiency of chemical inhibitory protection in fight against internal corrosion of field pipelines (In Russ.), Neftegazovoe delo, 2016, no. 3, pp. 137–156.
6. Serysheva G.S., Analysis of the selection and evaluation of the effectiveness of new brands of corrosion inhibitors at the facilities of the RITEK-Samara-Nafta TPP (In Russ.), Inzhenernaya praktika, 2020, no. 4, pp. 44–46.
7. Savel’ev V.V., Ivanov A.N., Avdeev A.S. et al., Integrated solutions for improving the reliability of Vietsovpetro subsea oil pipelines (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2024, no. 2, pp. 106–110,
DOI: https://doi.org/10.24887/0028-2448-2024-2-106-110
8. Velikzhanina N.V., Korberg P.N., The effectiveness of the implementation of inhibitor protection of high-pressure water pipelines at the fields of TPP Langepasneftegaz of LUKOIL-Western Siberia LLC (In Russ.), Inzhenernaya praktika, 2019, no. 1, pp. 42–47.
9. Tkacheva V.E., Markin A.N., Markin I.A., Presnyakov A.Yu., Local corrosion: calculation in oil field conditions (according to weight measurements) (In Russ.), Praktika protivokorrozionnoy zashchity, 2021, V. 26, no. 1, pp. 28-40,
DOI: https://doi.org/10.31615/j.corros.prot.2021.99.1-3
10. Vtorenko E.A., Valekzhanin I.V., Latypov O.A., Khakimov A.M., Determination of the rate of local corrosion of tubing as a necessary element of corrosion monitoring (In Russ.), KORROZIYa, 2024, no. 4 (105), pp. 40-44,
DOI: https://doi.org/10.24412/2076-6785-2024-4-40-44
11. Fot K.S., Markin A.N., High corrosion inhibitor availability concept: Myth or reality? (In Russ.), Neftegazovoe delo, 2025, V. 23, no. 2, pp. 179–190,
DOI: https://doi.org/10.24412/2076-6785-2024-4-40-44
12. Horsup D.I., Clark J.C., Binks B.P. et al., The fate of oilfield corrosion inhibitors in multiphase systems, CORROSION, 2010, V. 66, no. 3,
DOI: https://doi.org/10.5006/1.3359624
13. Fot K.S., Kolevatov A.N., Zhmaeva E.V. et al., Corrosion inhibitor partition coefficient as a promising tool for effective inhibitory protection (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2025, no. 1, pp. 80–85,
DOI: https://doi.org/10.24887/0028-2448-2025-1-80-85
14. Fot K.S., Tkacheva V.E., Garfutdinov I.F., Markin A.N., Effective dosage of corrosion inhibitors for oilfield equipment protection from localized carbon dioxide corrosion (In Russ.), Neftegazovoe delo, 2024, no. 5, pp. 193–220,
DOI: https://doi.org/10.17122/ogbus-2024-5-193-220
15. Zvezdkina E.M., Zhuravel’ N.G., Lapitskaya E.V. et al., Analysis and ways to improve the efficiency of inhibitor protection of oil field pipelines at the Republican Unitary Enterprise “Production Association “Belorusneft” (In Russ.), Inzhenernaya praktika, 2012, no. 5.
16. Tkacheva V.E., Markin A.N., Medium for local CO2-corrosion laboratory testing (In Russ.), Praktika protivokorrozionnoy zashchity, 2021, V. 26, no. 4,
pp. 7–17, DOI: https://doi.org/10.31615/j.corros.prot.2021.102.4-1
