Wellbore Cement on Demand: Cement Rheology on Stress Regime Dependency

Abstract: This study aims to explore the dependency of cement rheology on the varying forces experienced in different subsurface environments. The core objective is to provide a cement recipe that enhance wellbore integrity by tailoring cement bond quality to withstand the specific forces encountered in typical stress regimes of subsurface. Rheological assessments of cement slurries have been conducted under controlled laboratory conditions that mimic the forces corresponding to normal fault, strike-slip, and reverse fault regimes. The research involved a series of shear stress tests, compressive strength analyses, and dynamic simulations to model the influence of these forces on cement properties. Results revealed a critical force-dependent rheology relationship. Cement slurries demonstrated varied responses to shear and compressive forces, with optimal formulations emerging for each force regime. In the normal fault regime, cement slurries with high tensile strength were more effective, whereas strike-slip conditions required enhanced shear resistance. For the reverse fault regime, cements with superior compressive performance showed the best results. The innovative aspect of this research lies in the real-time adaptation of cement slurry compositions based on the stress regime and forces acting on the wellbore wall. This approach leverages advanced rheological models and predictive analytics to customize cement formulations dynamically during the cementing process.