75504 Magazine of Civil Engineering Magazine of Civil Engineering 2712-8172 4 10.34910/MCE.141.4 Cement paste stratification at critical cementing point Cement paste stratification at critical cementing point 0000-0001-5985-8050 57220745862 Kovalchuk Vlada kovalchuk.vsk@gmail.com Tsigelnyuk Elena etsygelnyuk@inbox.ru St. Petersburg State University of Architecture and Civil Engineering LLC “GEOKEM” 13 02 2026 19 1 141 14104 14104

The relevance of this research is driven by the necessity to investigate and predict the technological parameters of grouting mixtures in conditions that closely resemble real-world scenarios. The subject of this study is a grouting compound used in well construction, which serves to ensure the adhesion between the casing and the formation, strengthen the borehole walls, and prevent the leakage of underground fluids. The objective is to develop a methodology for investigating the cement mixture formation based on both theoretical and empirical data, with the aim of most accurately representing the actual behavior of the grouting solution within the annulus of a wellbore. The authors have proposed a model for two types of cement mortar structures. A method for examining the sedimentation stability of cement mortars using a specially designed experimental setup and monitoring protocol is presented. The analysis of samples collected at the proposed site allows us to study changes in the density of cement slurry over time, while simulating the behavior of cement in the annulus during the first hour of pumping. The findings indicate a tendency towards thickening and hardening of the cement mixture, as well as highlight potential issues that may arise when the cement composition does not meet the requirements set by downhole conditions. The statistical analysis of measured data demonstrates good reproducibility with low error, allowing us to simulate deposition of cement under various conditions. The results and the proposed recommendations for improving cement stability will be of value to technical experts and researchers, enabling them to achieve the objectives of environmentally friendly, time-efficient, and economically viable well construction.

 casing cementing structure formation sedimentation cement density cement bleeding cement segregation solids settling fluid loss References Hu, X., Liu, S., Wen, C., Wang, Y., Wang, Y., Zhang, Y., Yang, M. Failure Mechanism of Zonal Isolation for Cement Sheath Induced by Density Reduction Operations after Liner Casing Cementing. ACS Omega. 2025. 10(18). Pp. 18657–18667. DOI: 10.1021/acsomega.5c00006 Wu, X., Li, Z., Hou, M. Z., Liu, J., Huang, S., Su, D., Li, J., Cao, C., Wu, L., Song, W. Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research. ACS Omega. 2024. 9(16). Pp. 17741–17759. DOI: 10.1021/acsomega.4c00475 Alkhamis, M., Imqam, A. A Simple Classification of Wellbore Integrity Problems Related to Fluids Migration. Arabian Journal for Science and Engineering. 2021. 46. Pp. 6131–6141. DOI: 10.1007/s13369-021-05359-3 Stryczek, S., Kremieniewski, M. Multi-Component Cements for Sealing Casing Columns in Boreholes. Buildings. 2023. 13(7). Article no. 1633. DOI: 10.3390/buildings13071633 Khazaei, M., Dehvedar, M. A Novel Fluid Loss Control Agent for Reducing Transition Time and Optimizing Fluid Loss and Rheological Properties in Fresh Cement Slurry. Heliyon. 2025. 11(4). Article no. e42699. DOI: 10.1016/j.heliyon.2025.e42699 El Bitouri, Y., Azema, N. Potential Correlation Between Yield Stress and Bleeding. ACI Materials Journal. 2021. 349. Pp. 479–494. DOI: 10.14359/51732766 Yu, Y., He, Y., Tang, R., Liang, D., Yuan, H-Z. Lattice Boltzmann simulation of power-law fluid flow past fixed and counter-rotating tandem cylinders. Physics of Fluids. 2025. 37. Article no. 033102. DOI: 10.1063/5.0257073 Chernyshov, S., Galkin, V., Ulyanova, Z., Macdonald, D. Development of mathematical models to control the technological properties of cement slurries. Journal of Mining Institute. 2020. 242. Pp. 179–190. DOI: 10.31897/pmi.2020.2.179 Kolawole, J., Combrinck, R., Boshoff, W. Understanding the role of rheology in the plastic settlement and shrinkage cracking of early age concrete. RILEM Technical Letters. 2022. 7. Pp. 112–126. DOI: 10.21809/rilemtechlett.2022.139 Wang, X., Li, S., Zhou, A., Liu, R., Liu, Y., Zhang, C. An analytical model of apparent viscosity in bleeding process. Construction and Building Materials. 2021. 303. Article no. 124471. DOI: 10.1016/j.conbuildmat.2021.124471 Brykov, A. The Aspects of Bleeding Instability of Portland Cement. Recent Progress in Science and Technology. 2023. 9. Pp. 1–7. DOI: 10.9734/bpi/rpst/v9/5802A Peng, Y., Pedersen, B., Ng, S., De Weerdt, K., Jacobsen, S. Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste. Nordic Concrete Research. 2018. 58(1). Pp. 107–125. DOI: 10.2478/ncr-2018-0007 Chen, Z., Liu, Y., Sui, H., Souza, F., Sagoe‐Crentsil, K., Neild, A., Duan, W. Investigating tricalcium silicate dissolution kinetics in cementitious materials through single‐particle analysis. Journal of the American Ceramic Society. 2025. 108(7). Article no. e20491. DOI: 10.1111/jace.20491 Perrot, A., Lecompte, T., Khelifi, H., Brumaud, C., Hot, J., Roussel, N. Yield stress and bleeding of fresh cement pastes. Cement and Concrete Research. 2012. 42(7). Pp. 937–944. DOI: 10.1016/j.cemconres.2012.03.015 Chajec, A., Sadowski, Ł. Bleeding of Cement Pastes Modified with the Addition of Granite Powder. International RILEM Conference on Early-Age and Long-Term Cracking in RC Structures. RILEM Bookseries. 2021. 31. Pp. 307–318. DOI: 10.1007/978-3-030-72921-9_25 El Bitouri, Y., Azéma, N. Contribution of turbidimetry on the characterization of cement pastes bleeding. Advances in Cement Research. 2023. 35(4). Pp. 180–190. DOI: 10.1680/jadcr.22.00040 Massoussi, N., Keita, E., Roussel, N. The heterogeneous nature of bleeding in cement pastes. Cement and Concrete Research. 2017. 95. Pp. 108–116. DOI: 10.1016/j.cemconres.2017.02.012 Draganović, A., Stille, H. Bleeding and Bleeding Measurement of Cement-Based Grout. Proceedings of the Fourth International Conference on Grouting and Deep Mixing. New Orleans, LA, 2012. Pp. 1681–1690. DOI: 10.1061/9780784412350.0143 Wang, N., Gao, Y., Pang, H., Zhu, L., Xia, L., Xia, B. Study on Physical and Mechanical Properties of Micro-Cement Grouting Materials with Different Water-Cement Ratio. Journal of Physics: Conference Series. 2022. 2381. Article no. 012099. DOI: 10.1088/1742-6596/2381/1/012099 Yanliang, J., Sun, Z., Yang, J., Pel, L., Raja, A., Ge, H. NMR study on bleeding properties of the fresh cement pastes mixed with polycarboxylate (PCE) superplasticizers. Construction and Building Materials. 2020. 240. Article no. 117938. DOI: 10.1016/j.conbuildmat.2019.117938 Gökçe, H.S., Andiç-Çakır, Ö. Bleeding characteristics of high consistency heavyweight concrete mixtures. Construction and Building Materials. 2019. 194. Pp. 153–160. DOI: 10.1016/j.conbuildmat.2018.11.029 Abadassi, M., El Bitouri, Y., Azéma, N., Garcia-Diaz, E. Effect of Excessive Bleeding on the Properties of Cement Mortar. Construction Materials. 2023. 3(2). Pp. 164–179. DOI: 10.3390/constrmater3020011 Jancarikova, D., Hela, R., Netsvet, D., Perina, T. Variability in cement properties – influence on bleeding of cement paste. IOP Conference Series: Materials Science and Engineering. 2018. 385. Article no. 012021. DOI: 10.1088/1757-899X/385/1/012021 Peng, Y., Lauten, R.A., Reknes, K., Jacobsen, S. Bleeding and sedimentation of cement paste measured by hydrostatic pressure and Turbiscan. Cement and Concrete Composites. 2017. 76. Pp. 25–38. DOI: 10.1016/j.cemconcomp.2016.11.013 Obgadze, T.A. On mathematical modeling of suspension dynamics. IV Mezhdunarodnyy Kosyginskiy Forum “Problemy inzhenernykh nauk: formirovaniye tekhnologicheskogo suvereniteta.” Sbornik nauchnykh trudov Mezhdunarodnogo nauchno-tekhnicheskogo simpoziuma “Sovremennyye inzhenernyye problemy klyuchevykh otrasley ekonomiki strany” (20–22 fevralya 2024 g.) [The 4th International Kosygin Forum “Problems of Engineering Sciences: Formation of Technological Sovereignty.” Proceedings of the International Scientific and Technical Symposium “Modern Engineering Problems of Key Sectors of the National Economy” (February 20–22, 2024)]. Moscow: The Kosygin State University of Russia, 2024. Pp. 102–105. Von Bronk, T., Haist, M., Lohaus, L. The Influence of Bleeding of Cement Suspensions on Their Rheological Properties. Materials. 2020. 13(7). Article no. 1609. DOI: 10.3390/ma13071609 Selyaev, V.P., Nizina, T.A., Lankina, Yu.A., Zimin, A.N., Nizin, D.R. The program complex for modelling of unfettered by sedimentation of the particles of the filler in the process of curing polymer systems. Construction materials, equipment, technologies of the 21st century Roofing and insulation materials. 2012. 8(163). Pp. 34–37. Bauman, A.V. Sgushchenie i vodooborot. Kompleksnye resheniya i “nou-khau.” [Condensation and water circulation. Comprehensive solutions and “KNOW-HOW.”] [Online]. System requirements: AdobeAcrobatReader. URL: https://gmexp.ru/netcat_files/multifile/2382/Sguschenie_i_vodooborot.pdf (date of application: 03.05.2025). Rahimbaev, Sh.M., Shatov, A.A., Dryamina, M.A., Kamaliev, I.Z. Influence of soda waste products to fluidity properties and settling stability of cement systems. Bashkir Chemical Journal. 2006. 13(3). Pp. 114–117. Mamedtagizade, M.A. Statistical analysis of the influence of the cement slurry composition and properties on the sedimentation stability. Equipment and technologies for the oil and gas industry. 2017. 4. Pp. 25–28. Shahova, L.D., Kotliarov, R.A. Requirements for normal consistency, water demand and water separation of cements for transport construction. Stroitel’nye Materialy [Construction Materials]. 2018. 5. Pp. 57–60. Kastornykh, L.I., Rautkin, A.V., Raev, A.S. Effect of water-retaining admixtures on some properties of self-compacting concretes. Part 1. Rheological characteristics of cement compositions. Stroitel’nye Materialy [Construction Materials]. 2017. 7. Pp. 34–38. Brykov, A.S. Sauses of instability of water separation of cement paste. Cement and Its Application. 2021. 6. Pp. 72–74. Bobryshev, A.N., Lakhno, A.V., Voronov, P.V. New approaches for evaluating rheological models in composites. IOP Conference Series: Materials Science and Engineering. 2015. 86. Article no. 012001. DOI: 10.1088/1757-899X/86/1/012001 Bobryshev, A.N., Galimov, E.R., Kozomazov, N.V. Analiticheskaya otsenka kriticheskogo soderzhaniya elementov v zadachakh teorii protekaniya [Analytical assessment of the critical content of elements in flow theory problems]. Bulletin of Kazan Technological University. 2013. 16(20). Pp. 30–34. Bobryshev, A.N., Zubarev, P.A., Kuvshinov, P.I., Lakhno, A.V. Analysis of filler distribution in the structure of composites. Online bulletin of VolgGASU. Polythematic Series. 2012. 1(20). Pp. 1–28. Yuan, Y., Wang, X., Chen, X., Xiao, P., Koenders, E., Dai, Y. Mathematical models of apparent viscosity as a function of water–cement/binder ratio and superplasticizer in cement pastes. Scientific Reports. 2023. 13. Article no. 22301. DOI: 10.1038/s41598-023-48748-4 Kravchenko, V.V. Modeling of the parameters of the poral state of the cement stone within the concept of “internal moisture.” Vestnik of the Polotsk State University. Part F. Constructions. Applied Sciences. 2017. 8. Pp. 28–41. Khohryakov, O.V., Bahtin, M.A. About the role of changes in state of water in hardening cement of low water requirement. Izvestiya KGASU. 2011. 3(17). Pp. 166–170. Xuebing, W., Shengbo, G. Influence of different curing conditions on water absorption of cement-based materials under dry and wet cycles. Materials Research Express. 2022. 9. Article no. 095203. DOI: 10.1088/2053-1591/ac8cd1 Li, H., Shi, M., Zhang, J., Peng, L. An experimental study on the influence of low - cement content on improved filling characteristics of geotextile bags filled with fine tailings slurry. Frontiers in Materials. Section Structural Materials. 2025. 12. Article no. 1529905. DOI: 10.3389/fmats.2025.1529905 Nikolaev, N., Kozhevnikov, E. Enhancing the cementing quality of the well with horizontal profile. Perm Journal of Petroleum and Mining Engineering. 2014. 11. Pp. 29–37. DOI: 10.15593/2224-9923/2014.11.3