Қазақстанның мұнай-газ саласының хабаршысыҚазақстанның мұнай-газ саласының хабаршысы2707-42262957-806XKMG Engineering10896210.54859/kjogi108962Review ArticleSpacer fluids for wells drilled with invert emulsion drilling fluids: a review of their role in preventing formation damageKabdushevArman A.<p>PhD</p>arman-kz@mail.ruhttps://orcid.org/0000-0003-3579-9054AgzamovFarit A.<p>D. Sc. (Engineering), Professor</p>faritag@yandex.ruhttps://orcid.org/0000-0001-5850-5261IssayevaDina A.isaevadina86@gmail.comhttps://orcid.org/0009-0005-0384-0122IsmailovAbdulakhat A.<p>Cand. Sc. (Engineering), Professor</p>a.ismailov@kbtu.kzhttps://orcid.org/0000-0002-1957-5168Dulaty UniversityUfa State Petroleum Technological UniversityKazakh-British Technical University300620268216261303202622052026Copyright © 2026, Kabdushev A.A., Agzamov F.A., Issayeva D.A., Ismailov A.A.2026<p>This article examines problems associated with the quality of cementing and casing integrity in oil and gas wells under conditions of increasing drilling activity in Kazakhstan. It is shown that complications such as behind-casing hydrocarbon migration, sustained casing pressure, and water coning are largely caused by poor cementing quality and the loss of wellbore integrity. It is noted that more than 30% of wells worldwide exhibit inter-casing pressures of varying intensity, which highlights the relevance and significance of this issue. The main causes of cement sheath degradation under the influence of mechanical, hydraulic, and thermal loads during well operation are analyzed. Particular attention is given to the problem of incomplete displacement of drilling fluids in the annular space, which leads to channel formation and a reduction in the isolation properties of the cement sheath. The role of buffer fluids in the cementing of wells drilled with hydrocarbon-based drilling fluids is also considered. The study emphasizes the need to develop effective buffer systems that ensure compatibility between drilling fluids and cement slurries, thereby improving displacement efficiency and enhancing the overall quality of well cementing and zonal isolation.</p>well cementingwellbore integrityinter-casing pressurebehind-casing hydrocarbon migrationcement sheathspacer fluidsoil-based drilling fluidszonal isolationұңғымаларды цементтеуұңғыма оқпанының тұтастығыбағанаааралық қысымколонна сыртындағы көмірсутектердің көшіп-қонуыцемент тасыбуферлік сұйықтықтаркөмірсутек негізіндегі бұрғылау ерітінділеріқабаттарды оқшаулауцементирование скважинцелостность ствола скважинымежколонное давлениезаколонная миграция углеводородовцементный каменьбуферные жидкостибуровые растворы на углеводородной основеизоляция пластов1.kazenergy.com [интернет]. KAZENERGY. Национальный энергетический доклад 2021 [дата обращения 02.02.2026]. 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