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A general finite volume based numerical algorithm for hydrocarbon reservoir simulation using blackoil model

Mehdi Mosharaf Dehkordi (School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran)
Mehrdad T. Manzari (School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran)
H. Ghafouri (Civil Engineering Department, Shahid Chamran University, Ahwaz, Iran)
R. Fatehi (Department of Mechanical Engineering, Persian Gulf University, Bushehr, Iran)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 28 October 2014

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Abstract

Purpose

The purpose of this paper is to present a detailed algorithm for simulating three-dimensional hydrocarbon reservoirs using the blackoil model.

Design/methodology/approach

The numerical algorithm uses a cell-centred structured grid finite volume method. The blackoil formulation is written in a way that an Implicit Pressure Explicit Saturation approach can be used. The flow field is obtained by solving a general gas pressure equation derived by manipulating the governing equations. All possible variations of the pressure equation coefficients are given for different reservoir conditions. Key computational details including treatment of non-linear terms, expansion of accumulation terms, transitions from under-saturated to saturated states and vice versa, high gas injection rates, evolution of gas in the oil production wells and adaptive time-stepping procedures are elaborated.

Findings

It was shown that using a proper linearization method, less computational difficulties occur especially when free gas is released with high rates. The computational performance of the proposed algorithm is assessed by solving the first SPE comparative study problem with both constant and variable bubble point conditions.

Research limitations/implications

While discretization is performed and implemented for unstructured grids, the numerical results are presented only for structured grids, as expected, the accuracy of numerical results are best for structured grids. Also, the reservoir is assumed to be non-fractured.

Practical implications

The proposed algorithm can be efficiently used for simulating a wide range of practical problems wherever blackoil model is applicable.

Originality/value

A complete and detailed description of ingredients of an efficient finite volume-based algorithm for simulating blackoil flows in hydrocarbon reservoirs is presented.

Keywords

Acknowledgements

The authors appreciate the financial support received from the Iran National Science Foundation (INSF) to complete this research.

Citation

Mosharaf Dehkordi, M., T. Manzari, M., Ghafouri, H. and Fatehi, R. (2014), "A general finite volume based numerical algorithm for hydrocarbon reservoir simulation using blackoil model", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 24 No. 8, pp. 1831-1863. https://doi.org/10.1108/HFF-10-2013-0302

Publisher

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Emerald Group Publishing Limited

Copyright © 2014, Emerald Group Publishing Limited