A general finite volume based numerical algorithm for hydrocarbon reservoir simulation using blackoil model
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 28 October 2014
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
:Emerald Group Publishing Limited
Copyright © 2014, Emerald Group Publishing Limited