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Parametric Investigation of Fluid Migration in Casing-Liner Cement Sheaths and Microannulus Using Computational Fluid

Mahmoud Elzenary1, Murtada Saleh Aljawad1,2, Shirish Patil1,2

  • 1College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia.

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Summary

This study models fluid leakage in cement sheaths, finding that higher permeability, larger microannuli, and shorter overlaps increase leakage. Fluid compressibility significantly amplifies leakage at high pressures.

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Area of Science:

  • Petroleum Engineering
  • Fluid Dynamics
  • Geology

Background:

  • Cement sheath integrity is crucial for wellbore stability and preventing fluid migration.
  • Microannuli formation in casing-liner overlaps can compromise zonal isolation.
  • Understanding fluid leakage dynamics is essential for effective well design and risk management.

Purpose of the Study:

  • To develop a computational fluid dynamics (CFD) model for fluid leakage through cement sheaths in casing-liner overlaps with microannuli.
  • To investigate the impact of various parameters on fluid leakage rates under transient conditions.
  • To provide insights for optimizing cement sheath properties and well configurations.

Main Methods:

  • Development of a fluid dynamic model based on Darcy's law for transient flow.
  • Simulation of fluid leakage through a cement sheath with a microannulus in the casing-liner overlap.
  • Parametric study analyzing the effects of permeability, porosity, microannulus size, overlap length, pressure, and temperature.

Main Results:

  • Increased permeability, larger microannuli, and shorter overlap lengths significantly enhance fluid leakage rates.
  • Lower porosity adversely affects leakage, while high operating pressures substantially increase flow rates.
  • Fluid compressibility amplifies leakage at high pressures due to gas expansivity, especially under transient conditions.

Conclusions:

  • The developed model accurately predicts fluid leakage dynamics in casing-liner overlaps.
  • Optimizing cement sheath properties (e.g., permeability, porosity) and overlap design is critical for well integrity.
  • Understanding the influence of pressure and fluid compressibility is vital for managing leakage risks in oil and gas wells.