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Experimental Study of LSW Injection in Fractured Porous Media: Fracture Geometrical Properties at Pore Scale

Mahmoudzadeh Zarandi, Atena | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53502 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Masihi, Mohsen; Fatemi, Mobeen
  7. Abstract:
  8. Enhancing oil production from fractured reservoirs is challenging. The flow characteristics observed in naturally fractured reservoirs are complicated due to interaction between the two different flow domains: fracture and matrix. Spontaneous imbibition is one of the most important recovery processes in water-wet fractured reservoirs. Oil cannot be spontaneously produced from oil-wet rocks, unless the capillary pressure barrier between fracture conduits and matrix is overcome. The flow characteristics in fractured systems thus relate to the wettability of the rocks. Low salinity water injection has been widely studied as a method of enhancing oil recovery in recent years. However, its impact has been less noticeable in fracture reservoirs. Despite numerous studies and various mechanisms proposed in low salinity water injection, there is still no consensus on the dominant mechanism of this process. In this study, the effect of low salinity water injection on oil recovery compared to formation water and seawater in four different micro models has been investigated. In addition to the effect of fracture geometry, the effect of wetting conditions was also studied. The results of experiments in oil-wet condition showed the formation of water-in-oil micro-emulsions in low salinity water injection and the swelling of the oil, which had a significant effect on oil recovery, resulting in twice the oil production compared to the other two waters. Low salinity water injection in water-wet conditions also improved the capillary imbibition process which resulted in increasing the oil recovery by about 50% in fracture reservoirs
  9. Keywords:
  10. Fractured Reservoirs ; Micromodel ; Fracture Geometrical Properties ; Imbibition Process ; Low Salinity Water Flooding ; Displacement Mechanism ; Pore-Scale Model

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