Қазақстанның мұнай-газ саласының хабаршысыҚазақстанның мұнай-газ саласының хабаршысы2707-42262957-806XKMG Engineering10856410.54859/kjogi108564Research ArticleElaboration of mending additives for the cement sheath repairAgzamovFarit A.<p>Doctor of Sciences in Technology, Professor, Oil and Gas Well Drilling Department</p>faritag@yandex.ruhttps://orcid.org/0000-0001-5850-5261IsmagilovaElvira R.<p>master of oil and gas business, lecturer of the department "Drilling of oil and gas wells"</p>yusupova_elvira@mail.ruBeshirMuhamed A.<p>Production technologist</p>el.to.the.moe@gmail.comLeading Oil and Gas University of the Russian FederationShell plc151020224369752106202215072022Copyright © 2022, Agzamov F.A., Ismagilova E.R., Beshir M.A.2022<p><em>The dynamic loads and internal stresses applied onto a well during its operation period, gradually leads to deterioration of the cement sheath that usually exists behind the casings. Such mechanical and chemical exposure causes the cement to develop severe cracks that enables cross feeds behind casings and uncontrollable flow between formations leading to oil-gas mixture and migration of hydrocarbons into freshwater aquifers causing immediate harm to local water sources [1], affecting the zonation capability of the cement itself behind the casings.</em></p> <p><em>This issue has been in the industry of oil and gas for ages, leading us to investigate the possibility of maintaining the integrity of the cement stone behind the casings through the principle of self-healing materials, through this principle a self-healing cement was formulated adding secret agents into the ordinary cement powder which will be able to cure cracks in the cement stone under special conditions without human intervention. This can be an effective measure for loss of well integrity prophylaxis and eliminates well shutdowns for well workover operations.</em></p>"self-healing" cementwell support integritymodifying additiveshydraulic sealingcement sheathcracks"самовосстанавливающийся" цементгерметичность крепи скважинымодифицирующие добавкигидроизоляцияцементное кольцотрещины1.Ismagilova E. An approach to restore the integrity of cement stone using modifying additives, The 6th International Scientific and Practical Conference: Innovative Development & Problems in Oil and Gas Industry. – Almaty, KBTU, Kazakhstan, 2014, 558 p.2.Ismagilova E.R., Agzamov F.A., Abbas A.J. Optimization of self-healing additives dispersity in cement. – Georesursy = Georesources, 2017, v. 19, No. 2, pp. 129-134.3.Blaiszik B.J., Kramer S.L.B., Olugebefola S.C., Moore J.S., Sottos N.R., White S.R. Self- Healing Polymers and Composites. – Annu. Rev. Mater. Res., 2010, 40, р. 179–211.4.Jud D.G., Watts J.M. Schools and Housing Values. – Land Economics, 1981, vol. 57, issue 3, p. 459-470.5.Ismagilova E.R., Agzamov F.A. Development of additives for self-healing cements to restore the cement stone integrity in oil and gas wells. – JPT Drilling and Oil, 2016, 05, p. 24–29.6.Ismagilova E.R., Gryaznova Y. Application of modifying additives for well support recovery. – 64-th International Scientific and Engineering Conference of students and young scientists of Ufa State Petroleum Technological University, Ufa, 2013, р. 263-264.7.Agzamov F.A., Ismagilova E.R. Self-healing cements – the key to maintaining the integrity of cement sheath. Part 1. – Nanotehnologii v stroitel’stve = Nanotechnologies in Construction, 2019, Vol. 11, no. 5, pp. 577–586. DOI: 10.15828/2075-8545-2019-11-5-577-586.