Comparison of Reservoir Simulation Techniques for Gas Reservoirs: Semi-Analytical Tank Flow Model Approach versus Finite Volume Solutions

Date

2023-11-22

Author

Doğan, Mehmet Onur
Jamalbayli, Tayfun
Jamalbayov, Mahammad

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Comparison of Reservoir Simulation Techniques for Gas Reservoirs: Semi-Analytical Tank Flow Model Approach versus Finite Volume SolutionsMehmet Onur Doğan a, Tayfun Jamalbayli* a, Mahammad Jamalbayov ba Middle East Technical University, Turkey b SOCAR "OilGasScientificResearchProject" Institute, Azerbaijan * Corresponding author: jamalbaylit@gmail.comKeywords: Numerical Model Development; Reservoir Simulation; Reservoir Modeling; Gas Condensate Reservoirs; Reservoir EngineeringThis research introduces a hybrid approach for reservoir simulation and explores its practical utility within the context of gas condensate reservoirs. The study assesses the strengths and weaknesses of this approach by comparing it to the conventional two-phase gas condensate model that employs the finite volume method. The methodology utilizes material balance equations to compute the average reservoir pressure and saturation. These computed values are subsequently applied across the reservoir using an analytical flow model, while taking into consideration well placements. This results in the development of a semi-analytical simulation approach. In addition, the finite volume model is also created as a benchmark model for comparative purposes, including IMPES and Fully Implicit solutions. The validity of the finite volume model is established through a comparison with Eclipse simulation software. The proposed simulation approach calculates pressure and saturation distributions that exhibit notable deviations from the results of the finite volume method, particularly struggling to accurately represent the region near the wellbore in terms of saturation. However, it excels in terms of computational efficiency and outperforms traditional methods in terms of speed. To enhance this approach, a future recommendation involves integrating the pressure distribution derived from the hybrid method with traditional saturation calculations. This integration has the potential to rectify discrepancies in saturation distribution while retaining the method's speed advantages. In summary, the hybrid reservoir simulation method presents a promising innovation for reservoir simulation techniques. The outcomes of the study provide a pathway to address these limitations, ultimately paving the way for a more efficient reservoir simulation tool.

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https://hdl.handle.net/11511/106109

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Department of Petroleum and Natural Gas Engineering, Conference / Seminar