Abstract
Background: The challenging geological and thermobaric conditions of the Western Kazakhstan oil fields impose stringent requirements on cement slurry systems, while standard Portland cement formulations frequently fail to provide adequate zonal isolation over the well’s production lifecycle. Aim: This study aims to identify the key limitations of conventional cement compositions and substantiate the feasibility of introducing SiO₂, Al₂O₃ nanoparticles and carbon nanotubes to improve the rheological and mechanical properties of cement slurries. Materials and Methods: A comparative analysis was conducted using actual cementing program data from a well at the North Uaz field and a well at the Western Prorva field, evaluating slurry density, viscosity, thickening time, fluid loss, and compressive strength. Results: Standard formulations exhibited fluid loss exceeding acceptable thresholds and compressive strength below the required minimums; nanomodified compositions demonstrated a fluid loss reduction of up to 40% with SiO₂ addition and a 15–25% increase in early compressive strength with Al₂O₃. Conclusion: The introduction of nanocomposite additives is technically justified for overcoming the limitations of conventional cement systems under Western Kazakhstan field conditions.