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Experimental Investigation on the Performance of Preformed Particle Gel (PPG) in the Combined Injection of Low-Salinity Water and CO2: Conformance Control and for in the Naturally Fractured Systems

Abbasi Khoshkar, Peyman | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51172 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobin; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Excessive water production in highly heterogeneous mature reservoirs (water flooded or affected by water zones) leads to increased production costs. Water production causes sediment formation, creation of corrosion, water treatment and disposal, and finally due to the inefficiency of production, it leads to closure of the well.Among the methods introduced to reduce water production, the use of polymers and gels as an affordable and effective method has been widely used in enhanced oil recovery processes. The main mechanism in this method is blocking or limiting the major paths of water flow (fractures or high permeability zones) and thereby increasing sweep efficiency in water injection. “Preformed particle gel (PPG)” is a type of gel that has important advantages such as temperature resistance, long term stability, and so on.In summary, this research consists of three sections. In the first part, the PPG was synthesized by a novel method using nanoparticles. In the second part, the swelling performance of PPG samples under different conditions such as various pH of the environment, the type and concentration of cation and salt anions and so on was studied through different bulk tests. In the third section through the use of Hele-Shaw setup and micro model, application and effect of PPG on increasing the sweep efficiency of water injection and improving the oil production in EOR (such as low salinity water injection or carbon dioxide injection) studied for fractured systems. Static results proved that synthesized gel particles have good properties such as: temperature stability, pH-insensitivity, long-term stability and so on. The swelling of the synthesized gel in the early times has an inverse relationship with salt water concentration, but in the long term it acts independently of the amount of water salinity. Residual resistance factor (the factor which defines the gel ability to control water and CO2 fingering) for water and CO2 injection in this study are better than those reported in the open literature
  9. Keywords:
  10. Water Flooding ; Heterogeneous Reservoirs ; Enhanced Oil Recovery ; Preformed Particle Gel ; Swelling Ratio ; Residual Resistance Factor

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