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Compositional Simulation of 1-D Oil Reservoirs Flow Using a High-Resolution Central Scheme

Haghighi, Erfan | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39746 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. In recent years, oil and gas reservoirs are one of the most valuable natural resources and are the main economical basis of the country. Therefore any research which can help to optimize the efficiency and enhance their recovery is of great importance. In the past 30 years, reservoir simulation has evolved from a research field to one of the most flexible tools in reservoir engineering. Simulation is usually more quick, cost effective and reliable than other methods in predicting reservoir performance. Because of complexity of the great amount of computations, research in oil reservoirs field is usually done by mathematical/computer programs, named as simulators. For this reason, various physical models and numerical methods have been used. Compositional model is one of these physical models, which considers the flow including hydrocarbon components and water component which are in the liquid, vapor and aqua phases. The assumptions of isotherm flow, using Darcy’s law for description of velocity and pressure relation and modeling each hydrocarbon component of oil and gas separately, are among the most important and basic assumptions in this model. Mathematical compositional model consists of parabolic equation of velocity and pressure and hyperbolic equation system of mass conservation. Due to different nature of each of the above equations, a sequential approach has been used, in which in a time-step, first parabolic equations of velocity and pressure are solved using the assumption of constant fluid composition with a centered block finite volume scheme. Then assuming constant velocity and pressure, hyperbolic equation system of mass conservation are solved using a finite volume scheme and numerical flux is computed by Kurganov-Tadmor scheme in a structured grid system. One of the most significant characteristics of this method is independency of artificial diffusion from CFL number which is useful in maintaining the accuracy of the method in non-uniform grids or in reduced CFL cases. In this study, the governing equations of oil and gas flows are solved using this efficient numerical method which has been recently used for black-oil model. For verifying the implementation of the model and numerical method, some benchmark problem are solved and investigated.
  9. Keywords:
  10. Porous Media ; Two Phase Flow ; Integrated Model ; Finite Volume Method ; High Resolution Central

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