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Upscaling Compositional Simulation of Gas Injection Process Due to Enhanced Oil Recovery from an Oil Reservoir

Suri, Sajad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57744 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mihammad Hossein
  7. Abstract:
  8. Gas injection is a common method for enhanced oil recovery. Simulating the processes involved in this method requires solving compositional equations, which are computationally expensive, highlighting the need for compositional upscaling. Upscaling methods are categorized into three groups: single-phase, two-phase, and compositional upscaling. To execute reservoir flow models in coarse-scale simulations, all relevant parameters, including rock properties, flow functions, and phase properties of components, must be upscaled. In this study, due to the need for modifying flow equations, access to the source code of a reservoir simulator is necessary. Thus, a black-oil simulator and subsequently a compositional simulator were developed. For simulating large reservoirs, the Newton-Raphson algorithm with sparse matrices was developed. In the single-phase upscaling step, absolute permeability, which is independent of the fluid properties, is transferred to coarse blocks through a single-phase model. The black-oil simulator was utilized for this purpose. In the next step, using the compositional simulator and by calculating fluxes across each coarse block interface, flow functions (as two-phase properties) and transfer factors (as compositional properties) were upscaled through two-phase and compositional upscaling methods. While single-phase and two-phase methods successfully upscale their respective properties by employing established approaches from previous studies, the compositional method based on transport factors faces challenges in accurately transferring compositional properties. The primary goal of this research is to propose a novel method for compositional upscaling. In this context, transfer factors, which act as flow functions storing phase properties of components, are utilized in coarse-scale models. However, errors in transfer factors during compositional upscaling can lead to inaccuracies. To address this issue, an analytical approach based on flash calculations has been developed, demonstrating improved accuracy compared to the iterative method presented in Durlofsky's work
  9. Keywords:
  10. Compositional Simulation ; Transfer Factor ; Gas Injection ; Analytical Method ; Enhanced Oil Recovery ; Upscaling

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