Вестник нефтегазовой отрасли КазахстанаВестник нефтегазовой отрасли Казахстана2707-42262957-806XKMG Engineering10866210.54859/kjogi108662Review ArticleDevelopment the self-healing concept for well cement support integrity maintenance. Theory and practiceIsmagilovaElvira R.<p>Cand. Sc. (Engineering)</p>yusupova_elvira@mail.ruhttps://orcid.org/0000-0001-9610-0150Research and Design Institute of the Ufa State Petroleum Technological University030420246164733107202309112023Copyright © 2024, Ismagilova E.R.2024<p>Oftentimes oil and gas wells can be affected to various technological as well as chemical and natural stresses. Perforations, fracturing, side tracking from under the casings shoe, formation integrity testings all these lead to the cement sheath fragility and the annulus integrity deterioration causing the emergence of net of cracks in the cement sheath, which contribute to nascence of behind-the-casing flows.</p> <p>World statistics say that the issues of casing string-borehole annulus unsealing prevention, as well as the effective restoration of the cement sheath integrity in the presence of a wide range of water-shutoff materials and technologies for inflows bounding, do still remain open and require non-standard solutions. In this connection, the development of “self-healing” plugging material, which allows the cement stone to independently regenerate its integrity, thereby excluding technological shutdowns and the intervention of repair equipment, is one of the highest priority tasks and promising methods for eliminating behind-the-casing flows, accompanied by restoring the integrity of the well cement sheath. An advanced alternative to the traditional plugging material is elaboration of "self-healing" cements, which is hopeful in the line of the above-mentioned peculiarities.</p>self-healing cementcement sheathmodifying additivesplugging materialbehind-the-casing flowswell support durabilitywater influxөзін-өзі емдейтін цементцемент сақинасыөзгертетін қоспалартампонаж материалыбағана сыртының су айналымыұңғыманы бекітудің беріктігісу ағынысамозалечивающийся цементцементное кольцомодифицирующие добавкитампонажный материалзаколонная циркуляция водыдолговечность крепи скважиныводоприток1.Ismagilova E.R., Agzamov F.A. Development of additives in "self-healing" cements to restore the tightness of the cement ring of oil and gas wells // STJ Drilling-&-Oil. 2016. N 05. P. 36–41.2.Ismagilova E.R., Agzamov F.A., Abbas A.D. Optimization of the dispersion of additives in self-healing cements // GeoResources. 2017. Vol. 19, N 2. P. 129–134.3.Donald Jud G., Watts J.M. Schools and Housing Values // Land Economics. 1981. Vol. 57, N 3. P. 459–470.4.Jianhang F., Xiu Y.Y., Jian G., et al. Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking // Cement and Concrete Research. 2023. Vol. 165. 107074.5.Agzamov F.A., Ismagilova E.R. "Self-healing cements are the key to maintaining the tightness of the well supports." Part 1 // Nanotechnology in construction. 2019. Vol. 11, N 5. P. 577–586. doi:10.15828/2075-8545-2019-11-5-577-586.6.Agzamov F.A., Ismagilova E.R. "Self-healing cements are the key to maintaining the tightness of the well supports." Part 2 // Nanotechnology in construction. 2019. Vol. 11, N 6. P. 730–742. doi:10.15828/2075-8545-2019-11-6-730-742.7.Agzamov F.A., Ismagilova E.R., Beshir M.A. Elaboration of mending additives for the cement sheath repair // Kazakhstan journal for oil & gas industry. 2022. Vol. 4, N 3. P. 69–75. doi:10.54859/kjogi108564.8.Патент РФ на изобретение №2760860/01.12.2021. Бюл. No. 34. Агзамов Ф.А., Исмагилова Э.Р. Тампонажный материал. Available from: https://patents.google.com/patent/RU2760860C1/ru#patentCitations. Дата обращения: 16.08.2023.9.Ismagilova E.R., Ozdoev Z.I. Regulation of sheath properties of modifying additives used for the manufacture of "self-healing" cement. Modern technologies in oil and gas business // Proceedings of the international scientific and technical conference in 2 volumes. 2019. Vol. 1. P. 359–361.10.Патент РФ на полезную модель №154661/27.08.2015. Агзамов Ф.А., Нгуен К., Исмагилова Э.Р. Установка для исследования фильтрационных свойств пористых материалов.11.Hannov I.I. (LLC Geosphere). Drilling a water intake well. Act of completed works. 2021 Feb. Act No. 1. Contract No. 1-B.12.Ismagilova E.R., Agzamov F.A., Kuznetsov M.A. Economic justification of the use of self-healing cement to restore the cement ring; International Scientific and Technical Conference dedicated to the memory of Academic A.H. 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