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Experimental and Modeling Study of Gravity Drainage in Multi-Stack Blocks System

Karimi Malekabadi, Farzan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47460 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Rostami, Behzad; Gudarznia, Iraj
  7. Abstract:
  8. Gravity drainage is known as one of the major mechanisms of oil recovery in naturally fractured reservoirs which petroleum engineers conducted research in this realm. Block to block interaction such as capillary continuity and reinfiltration mainly control the efficiency of this mechanism. In this study, first of all, free fall and forced gravity drainage experiments have been conducted in a single block apparatus and effect of some parameters like, density viscosity relation, matrix permeability, vertical fracture aperture, presence of viscose force and type of injected gas were investigated, in the second step, three stack block apparatus were designed and constructed. This apparatus were perforated using laser. Perforations have specific number and diameter, so that matrix and fracture can interact. Horizontal fracture can be represented by using spacers with specific features. Then free fall experiment have been conducted in three stack block apparatus and effect of matrix permeability, spacer permeability, spacer wettability, spacer effective area and tilt angle from vertical axis were observed. The results of experiments revealed that by increasing density viscosity relation, matrix permeability oil recovery will increase. Also, presence of viscose driving force and using carbon dioxide can increase oil recovery. In the next phase, COMSOL has been used for modeling of gravity drainage in single and three stack blocks. Sensitivity analysis was performed and effect of some parameters such as density difference was investigated. Gravity drainage in a layered system with a high and low permeability layers were observed. Reinfiltration mechanism was studied by means of saturation profiles, generated by COMSOL. Satisfactory agreement has been observed between experimental result and developed COMSOL model. Finally modeling of three stack block showed that horizontal fracture aperture can decrease oil recovery in early time region of experiments. Also, modeling results revealed order of block permeability has no effect on oil recovery
  9. Keywords:
  10. Capillary Continuing ; Gravity Drainage Mechanism ; Reinfiltration ; COMSOL Software ; Spacer

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