Abstract
This study investigates the phenomena observed during CO₂ injection processing in wellbores, particularly the annular pressure buildup typically attributed to inadequate packer sealing. We propose that temperature, pressure, and phase changes during CO₂ injection induce equivalent stresses, leading to packer unsealing. A detailed CO₂ injection model was developed, incorporating temperature-pressure coupling and phase transitions using the state equation. The model evaluates the effects of injection temperature, pressure, and volume on CO₂ density, temperature, pressure, phase state, and velocity, and calculates the stress on the tubing at various depths. Validation against actual measurements showed errors of 1.43% for pressure and 0.66% for temperature, confirming the model's accuracy. Key findings reveal that injection temperature significantly affects CO₂ phase changes, while injection temperature and volume respectively impact stress at the wellhead and bottom. The model provides a robust tool for optimizing CO₂-EOR processes, confirming that changes in injection parameters can indeed cause packer unsealing, and its reliance on precise input data highlights the need for accurate field measurements.
Published Version
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