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Design and Modeling of the Cement Setting Time

Safaee, Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57119 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shad, Saeed
  7. Abstract:
  8. Cementing plays a crucial role in ensuring the long-term integrity of oil and gas wells, geothermal wells, and geologic sequestration (GS). The productivity of the well is directly impacted by the quality of cementing operations throughout its lifecycle, spanning drilling, production, and abandonment phases. This thesis focuses on modeling cement setting under varying pressure and temperature conditions within wells. It aims to accurately estimate the thickening time of cement slurry, and analyze the influence of thermodynamic factors like pressure, temperature, and heat generated by hydration reactions on the cement setting process through laboratory investigations. The study also delves into microstructural analyses that play a pivotal role in cement setting efficacy. To comprehend the thermodynamics involved in cement setting during hydration, a series of numerical simulation with the interaction of temperature, pressure, and degree of hydration was presented to predict the evolution of temperature and pressure in the wellbore, cement sheath, and formation during cement setting. This model considers the heat transfer of the cement slurry with the formation and drilling fluid in the wellbore, the heat produced during the cement hydration reaction, the gradually decreased pore pressure of cement slurry due to the development of cement gel strength, and the hydration kinetics. The proposed model was validated through three experiments from literature and field data, which demonstrate good agreement with the proposed model. Through this comprehensive analysis, efforts were made to enhance accuracy in predicting cement setting behavior under high-pressure high-temperature conditions—a critical aspect for designing optimal thickening time in challenging cementing operations
  9. Keywords:
  10. Numerical Simulation ; Hydration Reaction Kinetics ; Cement Setting Thermodynamics ; Cement Setting Modeling ; Drilling Cement ; Cementing ; Drilling Operation

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