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Experimental and Modeling Study of Scale and Flow Geometry Effects on Carbonate Matrix Acidizing Efficiency

Karimi, Masoud | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56765 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahaboddin
  7. Abstract:
  8. Acidizing is one of the common methods of stimulating the well to remove formation damage and Skin factor. In carbonate reservoirs, hydrochloric acid creates permeable channels called wormholes due to the reaction with the porous medium. Previous researches have studied the effect of the main rock and fluid parameters (temperature, pressure, type and concentration of acid and rock lithology) at the core scale. However, wellbore scale will different from core scale due to the difference in the wormhole density, the flow geometry, the amount of acid leakage from wormhole wall and competition. Very limited models predict these effects for large scales. In this research, the geometry of linear and radial flow of acid in different scales are evaluated by laboratory and modeling. The aim of these investigations is to provide a fast, direct and implementable model in simulation software to predict the growth rate of wormholes in different scales of porous medium and different geometries of acid flow. In laboratory, the radial acid injection setup was designed and built for the first time in Iran to simulate wormhole propagation in radial geometry equivalent to the geometry of the acid flow around the well. The linear and radial models developed in this thesis predicted the acid breakthrough pore volume and acid response curve for performed experiments with error coefficients R2=0.953, MSE=0.04652 and RMSE=0.2155. Also, taking account the fluid loss, the wormhole tip velocity is calculated 2 to 3 times as compared to the previous models, which will cause higher accuracy in calculating the acid breakthrough volume. The developed model accuracy is less than 10% error compared to the laboratory results
  9. Keywords:
  10. Carbonated Rock ; Acidizing Treatment ; Wormhole ; Matrix Acidizing ; Scale Effect ; Wormhole Propagation ; Wormhole Wall Fluid Loss ; Wormhole Tip Velocity ; Carbonate Resrevoirs

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