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Journal of Porous Media
IF: 1.752 5-Year IF: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Print: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019028985
pages 1379-1393

INVESTIGATION OF APPLICABILITY OF DUAL-POROSITY MODEL FOR POLYMER FLOODING SIMULATION

Assila Taymourtash
Institute of Petroleum Engineering, College of Engineering, University of Tehran, Tehran, Iran
Behnam Sedaee Sola
Institute of Petroleum Engineering, College of Engineering, University of Tehran, Tehran, Iran

ABSTRACT

Numerical simulation of the fractured reservoirs is one of the most challenging issues in reservoir engineering. This will be more significant in enhanced oil recovery, where the reservoir behavior is highly complicated. The dual-porosity model is one of the main methods for simulating a fractured reservoir in the field scale. The application of this model has been prevalent in the recent years. The good consistency of its results with the real reservoir behavior has well shown its competency, but the reliability of the results in simulating the enhanced recovery processes has not been published. In this paper the polymer flooding process—as an appropriate method substituting water flooding in fractured reservoirs—has been simulated with two methods including the dual-medium and dual-porosity modeling. The results from both models have been compared and the proficiency of the dual-porosity model in the polymer flooding simulation has been investigated. This study shows that the assumption of the equal cells volume of matrix and fracture in the dual-porosity model, which was used in many of the previous studies, will result in incorrect calculation of the amount of adsorbed polymer. This will consequently result in incorrect value of the reservoir rock permeability reduction, and also incorrect value of the polymer solution viscosity passing through the reservoir. Consequently, the prediction of the polymer solution behavior in the reservoir will not be reliable with this model. In the case of using the assumption of equal cells volume, which is inevitable to use in the field-scale simulation because of the huge runtime, some parameters should be modified. Modification of simulation based on guidelines mentioned in this research can improve the accuracy of numerical simulation in both educational and industrial projects.


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