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Type: Conference paper
Title: DFN model for flow simulation in hydraulically fractured wells with pre-existing natural fractures using unstructured quadrilateral grids
Author: Wang, K.
Peng, X.
Du, Z.
Haghighi, M.
Sayyafzadeh, M.
Citation: Proceedings Asia Pacific Unconventional Resources Conference and Exhibition, 2015 / pp.SPE-177020-MS-1-SPE-177020-MS-20
Publisher: Society of Petroleum Engineers
Issue Date: 2015
ISBN: 9781613993880
Conference Name: Asia Pacific Unconventional Resources Conference and Exhibition (15URCE) (09 Nov 2015 - 11 Nov 2015 : Brisbane, QLD)
Statement of
Keke Wang, Xiaolong Peng, Zhimin Du, Manouchehr Haghighi, Muhammad Sayyafzadeh
Abstract: Multiphase flow simulation of hydraulically fractured wells with pre-existing natural fractures is a challenging task. Discrete fracture network (DFN) is an effective method to simulate a system of anisotropic fracture network. In DFN method unlike double porosity approach, fractures can be defined in different scales and in different apertures and directions such that all details of fractures will be included in the simulation. Also all the interactions and fluid flow in and between the fractures and within the matrix are modelled in a unified manner, using the same computational grid. We developed software based on DFN model in which both induced fractures and pre-existing natural fractures can be placed at any location and direction in the geological model. Then, quadrilateral unstructured grids are generated using Paving method. Quadrilateral grids are more efficient and more flexible than triangular grids such that the number of quadrilateral grids is reduced to half. A drawback of algorithm in this mesh generation process is that very small grids are generated in the intersection of fractures and in the ends of the fracture grids due to the size difference between the fracture and the matrix. In order to avoid severe time-step restrictions associated with small cells, an endpoint transformation method is used to replace the quadrilateral grids with the triangular grids at both ends of the fracture. As a result, the number of very small grids at the ends of fractures is notably decreased.
Keywords: MPFA method; discrete fracture model; naturally fractured reservoir; quadrilateral unstructured mesh
Rights: © 2015 Society of Petroleum Engineers
RMID: 0030044841
DOI: 10.2118/177020-MS
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Appears in Collections:Australian School of Petroleum publications

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