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Experimental and Modeling Study of Liquid Bridge Stability in Horizontal Fractures: Effects of Flow, Diffusion, and Hysteresis

Sedaghatinasab, Reza | 2025

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 58735 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Capillary continuity between blocks can be established through direct contact, liquid bridge formation, or film flow over non-porous filler particles within the fracture. The capillary pressure curve in a rough fracture is examined under conditions where a liquid bridge forms between conical roughnesses. In the modeling section of this research, the capillary pressure of the fracture resulting from liquid bridge formation is determined based on the roughness characteristics. These capillary pressure values are presented for different rough models with cone-cone and cone-plane configurations. Finally, in this section, a J-function is provided for calculating the capillary pressure of a fracture with known specifications. In the experimental section, using a novel experimental setup, a flowing oil droplet in the presence of various injected gases under reservoir temperature and pressure conditions is investigated. The results indicate that, given the average aperture of carbonate reservoir fractures, the formation of a stable liquid bridge is possible. Another finding is that the breakup length of the flowing oil droplet increases with the injection rate, suggesting that viscous force acts as a stabilizing force for the droplet. Additionally, decreasing the interfacial tension between the oil and the surrounding gas under reservoir conditions reduces the droplet breakup length. In the section on modeling the flowing liquid bridge, simultaneous solving of the Navier-Stokes, continuity, and Young-Laplace equations is used to calculate the fracture capillary pressure arising from a flowing liquid bridge. Furthermore, this research investigates oil flowing liquid bridges between two thin rock sections with varying wettabilities and apertures. In the final section, the mass transfer mechanism, as one of the phenomena possible within a liquid bridge, is examined. In this part, by solving two-dimensional gas mass transfer equations to the liquid bridge, along with the Young-Laplace equation and the Peng-Robinson equation of state, characterization of the liquid bridge including calculating capillary pressure and changes in the bridge profile is performed
  9. Keywords:
  10. Capillary Pressure ; Fractured Reservoirs ; Roughness ; Mass Transfer ; Flowing Droplet ; Liquide Bridge

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