Study of Quadrilateral Unstructured Grids in a Numerical Simulation of Fractured Reservoirs

doi:10.11885/j.issn.1674-5086.2017.03.25.21

Abstract

Abstract: The introduction of unstructured quadrilateral meshes in the numerical simulation of fractured reservoirs is a popular area of research in the field of high-precision numerical simulation. These meshes can be used to create a grid with an unfixed number of connected components under the conditions of complex reservoir boundaries, cross fractures, multiple fractures, multi-directional fractures, complex multilateral wells, etc. Compared to other unstructured meshes, these meshes require fewer grids and have a higher precision. In this study, a mixed percolation model was established by combining the continuous medium model and the discrete fracture model. The numerical solution showed that the introduction of quadrilateral unstructured grids resulted in a significant decrease in the computational efficiency of the numerical simulation. Therefore, three solutions were proposed:morphing of the fracture endpoints with an improved paving algorithm, reordering of two-dimensional and threedimensional mesh numbers, and MPI parallel computing. The computational efficiency was then increased by an average of 70%.

Key words: unstructured quadrilateral mesh, computational efficiency, discrete fracture, mathematical model, reservoir numerical simulation

CLC Number:

TE319

LIU Yong, PENG Xiaolong, DU Zhimin. Study of Quadrilateral Unstructured Grids in a Numerical Simulation of Fractured Reservoirs[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 105-115.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2017.03.25.21

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