Advancing Cement Paste Shrinkage Modeling: Investigating The Normalized Ultrasonic Pulse Transit Time Evolution And Its Impact On Stress Analysis In Oil Wells
Palavras-chave:
cement shrinkage, finite element method, transit time, degree of hydration, remaining capacity.Resumo
This study presents a new modeling approach for predicting cement paste shrinkage evolution, with a
specific focus on its relationship with transit time, and consequently with the hydration of the cement paste. Cement
plays a crucial role in well integrity, and therefore, cement shrinkage is a critical factor in stress analysis within
oil wells. By developing a proper modeling technique, it becomes possible to numerically calculate the residual
capacity of the cement sheath, accounting for thermal and pressure loads throughout the well's lifespan. In this
research, a new modeling approach is proposed for the evolution of shrinkage based on cement slurry cured under
temperature 60 °C and pressure of 1.0 kpsi. The development of the cement was analyzed using ultrasonic pulse
velocity and volumetric shrinkage tests over a period of 90 hours. The newly developed shrinkage evolution model
is compared to the traditional linear adjustment method, considering the degree of hydration.
