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Experimental Study of ASP Flooding in Shaly Heavy Oil Reservoirs Using Five-Spot Micromodels

Mehranfar, Amin | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43127 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood; Masihi, Mohsen; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Heavy oil reservoirs include a major part of the world’s oil reservoirs. Therefore consideration to their enhanced oil recovery (EOR) aspects has a great importance. In heavy oil reservoirs secondary and tertiary EOR methods, have an insignificant effect on oil recovery and so we’d better to use chemical methods to improve mobility and oil recovery. One of the appropriate EOR methods which has attracted a lot of attention is alkaline – surfactant – polymer (ASP) flooding which has a considerable impact on EOR from heavy oil reservoirs. In this EOR method, the low concentration of surfactant in the injecting fluid, results in a low or ultra-low interfacial tension (IFT) between residual oil and injecting fluid that leads to more diffusion and contact of injecting fluid with reservoir oil. Also the present alkaline reacts with oil organic acids and produces in-situ surfactant which results in a lower IFT and more release and production of residual oil. In this method the polymer causes an increase in injecting fluid viscosity and reduces mobility ratio and viscous fingering. On the other hand a major part of oil reservoirs, especially heavy oils contain shale layers. In such reservoirs shale presence causes oil trapping and reduction in oil recovery percentage. In addition water flooding in such shaly heavy oil reservoirs, results in a low and unfavorable recovery factor, while using ASP as the injecting fluid, leads to a considerable increase in ultimate recovery factor. In this project ASP flooding in shaly and free-shale porous media is investigated using five-spot glass micromodels. The effects of various parameters like alkaline type and concentration and the salinity effect on one of them, surfactant type and concentration and the salinity effect on one of them, polymer type and concentration and the salinity effect on all of them, ASP type and the salinity effect on its performance and also the effects of shale properties such as length, orientation, numbers, continuity and discontinuity, their distance from injecting and producing wells, the distance between them, connate water saturation and also the presence of random shales are investigated. In addition some models of heterogeneous cross sections of sand stone, lime stone and dolomite are created to provide an understanding into the relationship between oil recovery and porous medium heterogenety. Also the wettability effect on chemical performance and oil recovery factor is evaluated through using two water-wet and oil-wet models containing random shale distribution. Furthermore phase displacement methods and displacement mechanisms in different conditions in shaly and heterogeneous models are investigated
  9. Keywords:
  10. Enhanced Oil Recovery ; Heavy Oil ; Alkaline-Surfactant-Polymer (ASP)Flooding ; Five-Spot Micromodel ; Discontinuous Shaly Structure

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