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Experimental Investigation of ASP Flooding for EOR in Fractured Heavy Oil Reservoirs Using Micromodel Apparatus

Sedaghat, Mohammad Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42472 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Massihi, Mohsen; Ghazanfari, Mohammad Hossein; Rashtchian, Davood
  7. Abstract:
  8. Heavy oil reservoirs contain huge amount of initial oil in place in the world. Thus, enhancement of their production attracts lots of attention. Primary and secondary oil recovery methods have just little effects on the production of these reservoirs, thus, using innovative chemical methods which lead them to increase their mobility is recommended to improve their oil recovery efficiency. One of these proper and novel methods which has been established recently to enhance oil recovery is ASP1 flooding that can significantly increase oil recovery from petroleum heavy oil reservoirs. In addition, considerable numbers of reservoirs especially heavy oil reservoirs are fractured reservoirs. In these reservoirs, fractures have significant effects on recovery enhancement in comparison with conventional reservoirs. In addition, waterflooding does not increase ultimate oil recovery too much. Thus, using ASP flooding is considered an appropriate method for enhanced oil recovery in these heavy oil reservoirs. This work concerns ASP flooding in conventional and fractured porous media with different characteristics by using five-spot micromodels. Different effects such as alkaline type, alkaline concentration, surfactant type, surfactant concentration, polymer type, polymer concentration and finally ASP type and concentrations are discussed in different fracture characteristics such as fracture length, fracture orientation, number of fractures, fracture continuity and fracture dispersion by doing many chemical flooding experiments. In addition, phase displacement and mechanisms of displacement in different conditions in dead end pores and fractured media are studied with taken pictures. Finally, experimental data are simulated by especial software to validate all experiments. The results show that the type of materials and their concentrations which are used in chemical flooding have direct and considerable effects on increasing oil recovery and intensifying displacement mechanisms in dead end and fractured models. For instance, although a cationic surfactant and high molecular weight hydrolyzed polyacrylamide were recommended to increase the efficiency of oil recovery, alkaline type does not show any important feature. Also, based on experimental results, geometric characteristics of fractures have significant effects in enhanced oil recovery. In addition, simulation results prepare essential information to simulate other experiments in glass micromodels
  9. Keywords:
  10. Enhanced Oil Recovery ; Five-Spot Micromodel ; Simulation ; Alkaline-Surfactant-Polymer (ASP)Flooding ; Fractured Patterns

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