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Numerical Simulation of Near-well Flow for Gas-condensate Reservoirs and Investigation of the Effect of Various Flow Parameters

Amirifar, Leyla | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43894 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizade Manzari, Mehrdad
  7. Abstract:
  8. This thesis studies a gas condensate reservoir and considers the effect of different parameters. In this group of gas reservoirs, if the pressure drops below the dew point pressure, liquid phase appears. Appearing and disappearing of phases creates four regions in the reservoir. In the region far from the production well, pressure is still above the dew point pressure and vapor phase is present. By approaching production well, pressure drops below the dew point pressure and liquid phase starts to form but it is immobile. In closer regions to the well the liquid phase saturation grows and this phase becomes mobile. As a result, relative permeability of the vapor phase decreases sharply. In the vicinity of the well, the porosity of the reservoir rock acts as a capillary tube and improves vapor phase’s relative permeability. On the other hand, flow velocity is high in this region. As a consequence Darcy’s law can not be applied due to additional pressure drop. Therefore liquid phase saturation increases.In this study a one dimensional radial model is used for the reservoir and the produc-tion well is located at the center. Grid generation in the radial direction is logarithmic. Governing equations, which are based on compositional model, are first discretized with finite difference method and then linearized with Newton-Raphson method. Fi-nally, the obtained equations are solved numerically with IMPES method to determine the flow patterns. Peng-Robinson equation of state is used for phase equlibria calcu-lations. Effect of various parameters on pressure and phase saturation distributions is investigated in this work.Results show that capillary forces enhance well performance by increasing the pres-sure while the presence of non-Darcy flow and skin effect decrease the reservoir pres-sure. The higher the initial pressure, the higher the reservoir pressure during the pro-duction. But it also leads to more pressure drop. Increasing production rate results in pressure reduction due to less recovery time
  9. Keywords:
  10. Gas Condensate Reservoirs ; Two Phase Flow ; Integrated Model

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