AP23484034 – Development of a methodology for assessment of quality, risk situations and decision making when casting well walls in complicated conditions

Objective of the project – is toincrease the efficiency of fixing the walls of wells on the basis of improving the methodology of the system for assessing the quality of cementing and managing the risks of emergency situations.

Relevance: The relevance of the project is determined by the increasing share of oil fields with hard-to-recover reserves worldwide, including Kazakhstan. Under such conditions, improving the quality of well construction becomes especially important, with reliable casing of well walls being one of the key stages. The quality of casing directly depends on the properties of the cement slurry used in well cementing. Despite significant scientific achievements in this field, there remains a need for further improvement of cement compositions. One of the promising directions is the use of various additives, including fiber reinforcement of cement, which enhances its strength characteristics. However, research in this area is still at an early stage, and fiber materials have not yet been widely adopted. Therefore, the development and implementation of new reinforced cement slurries is a relevant task aimed at improving the reliability and durability of wells.

Scientific supervisor: Doctor of technical sciences, Professor, Moldabayeva Gulnaz Zhaksylykovna

Expected and achieved results: During the implementation of the project, a review of the current state of research in the field of analysis and regulation of cement slurry compositions, as well as improving the quality of wellbore casing, was carried out. Studies by domestic and international researchers were analyzed, which made it possible to identify the main directions for further research. A critical analysis of existing cementing systems and technologies, as well as their application in well cementing practices, was conducted. Based on this analysis, key problems and priority tasks for improving well integrity were identified. Optimal compositions for modifying cementing materials used in oil and gas wells were determined. A comprehensive study of the influence of slurry composition on its quality characteristics was carried out. The selection of factors and parameters within the framework of the mathematical theory of experimental design was substantiated. Laboratory studies determined the quantitative influence of the water-cement ratio, viscosity, and static shear stress on the properties of the slurries. The obtained experimental data were processed using correlation and regression analysis methods, which made it possible to develop mathematical models. It was found that an increase in viscosity and static shear stress enhances the sedimentation stability of the slurry, while an increase in the water-cement ratio reduces its stability. Optimal parameter ranges ensuring maximum homogeneity and stability of the system were determined. The developed models and obtained relationships are of practical importance for predicting the behavior of cement and polymer systems and can be used in insulation and repair operations in oil and gas wells.

List of publications with links to them

1. Молдабаева Г.Ж., Козловский А.Л., Сулейменова Р.Т., Садвакасов М.А., Мухси А.С., Абилева С.Ж. Өндіруші ұңғымадағы қысымның таралу заңдылығын зерттеу // Нефть и газ. – 2024. – Т. 5. – № 143. – С. 143–153. – DOI: https://doi.org/10.37878/2708-0080/2024-5.11    
2. Сулейменова Р.Т., Каримова А.С., Абилева С.Ж., Садвакасов М.А., Жаксылыкова М.Ж., Шамшенова А. Жылумен әсер ету технологиясын дамытуды талдау және зерттеу // Нефть и газ. – 2024. – Т. 5. – № 143. – С. 223–236. – DOI: https://doi.org/10.37878/2708-0080/2024-5.17 
3. Молдабаева Г.Ж., Сулейменова Р.Т., Козловский А.Л., Садвакасов М.А., Мухси А.С., Куанышов А. Карбонатты кен орындарында қышқыл өңдеудің тиімділігін болжауға арналған модельдерді зерттеу // Нефть и газ. – 2024. – Т. 4. – № 142. – С. 124–137. – DOI: https://doi.org/10.37878/2708-0080/2024-4.16
4. Сулейменова Р.Т., Молдабаева Г.Ж. Қабаттардың мұнай бергіштігін арттыру әдістері: әдістемелік ұсыныс. – Алматы: Сатпаев университеті, 2024. – 227 б. – ISBN 978-601-10-0541-8.
5. Moldabayeva G.Zh., Kozlovskiy A.L., Sadvakassov M.A. Effect of Nanosized Mineral Additives on Strengthening and Corrosion Resistance of Cementing Mortars // ES Materials and Manufacturing. – 2025. – Vol. 28. – No. 1467. – P. 1–12. – DOI: https://dx.doi.org/10.30919/mm1467
6. Moldabayeva G.Zh., Kozlovskiy A.L., Buktukov N.S., Sadvakassov M.A. Increase of Wear Resistance and Strength of Cementing Mortars Due to Stabilizing Fine-Dispersed Additives of Metallurgical Sludge // ES Materials and Manufacturing. – 2025. – Vol. 28. – No. 1468. – P. 1–9. – DOI: https://dx.doi.org/10.30919/mm1468
7. Efendiyev G.M., Moldabayeva G.Zh., Buktukov N.S., Kuliyev M.Y. Comprehensive Cementing Quality Assessment and Risk Management System // SOCAR Proceedings. – 2024. – Vol. 4. – No. 4. – P. 042–047. – DOI: http://dx.doi.org/10.5510/OGP20240401015
8. Kabdushev A.A., Kembayev A.R., Bimbetova G.Zh., Agzamov F.A., Efendiyev G.M., Nadirov K.S. Development of the Composition of Lightweight Cement Slurry Using Microspheres and Microsilica // SOCAR Proceedings. – 2025. – Vol. 2. – No. 2. – P. 040–047. – DOI: http://dx.doi.org/10.5510/OGP20250201063
9. Молдабаева Г.Ж., Түзелбаева Ш.Р. Кен орындарын игеруді арттыру технологиялары: авторлық құқық объектісіне құқықтарды мемлекеттік тізілімге енгізу туралы куәлік № 49828. – Қазақстан Республикасы, 20.09.2024. – Ғылыми туынды.