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عنوان فارسی مقاله:

شبیه سازی جریان حوزه گسترده در مواد متخلخل شکافدار در چارچوب شبکه بولتزمن


عنوان انگلیسی مقاله:

Field-wide flow simulation in fractured porous media within lattice Boltzmann framework


سال انتشار : 2016



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مقدمه انگلیسی مقاله:

1. Introduction

This paper will provide a numerical methodology for the simulation of fluid flow through a fractured reservoir system (FRS); the goal of which is to optimize fluid production while reducing the cost associated with improper characterization of the subsurface environment. We will focus on two aspects of the FRS considered most pivotal: first, the complex boundary geometries present within the FRS between the fracture and surrounding porous medium, and second, the various flow regimes present within the FRS at various scales. The FRS, distinct from the porous rock matrix, provides high conductive pathways for fluid flow. The majority of fluid production comes from these high conductive pathways and the neighboring porous matrix, and so, the geometry of the FRS is a primary indicator of future fluid production (King, 2016, Warpinski and Teufel, 2016). The rate of production is also heavily dependent on the accelerating elements within the flow field. In a reservoir where fluid flows only through the porous rock matrix, Darcy flow is the primary flow regime (Dake, 1978). However, in the FRS, inertial flows and nonlinear damping flows play a significant part in the evolution of the flow field (Forchheimer, 2016, Anwar, 2008, Liu et al., 2016). It is necessary, therefore, for a FRS simulation tool to address both the complex boundary geometries and the multiple accelerating elements present in the flow field.Fluid flow in porous media at the field scale is most popularly modeled through finite element, finite volume, and finite difference methods (Aziz and Settari, 1979). To capture the cross flow between the porous rock matrix and the embedded fracture network, these methods incorporate single-porosity, dual-porosity, and discrete fracture models (Zidane and Firoozabadi, 2014, Moortgat and Firoozabadi, 2010, McClure et al., 2016 ). However, due to the challenges behind the implementation of these methods, and the high computational cost associated with capturing the geometry of the FRS, many in practice choose to idealize the fracture geometry (Mayerhofer et al., 2016, Cipolla et al., 2016, Fuentes-Cruz et al., 2016). Instead of simulating the FRS within the finite element/volume/difference framework, we propose a different simulation paradigm for the FRS using the lattice Boltzmann method (LBM). The LBM has fundamental properties, which make the method an attractive alternative - including the ability to capture multiple flow regimes of a slightly compressible fluid (Succi, 2001) as well as fine grained system resolution, while maintaining computational efficiency through simple parallelization procedures (Kandhai et al., 2016, Laniewski-Wollk and Rokicki, 2016). Originally developed from the Lattice Gas Automata, the LBM has been successfully applied to fluid flow through porous medium at the pore scale (Succi, 2001). However, sufficient pore geometry information is unavailable at the field scale, and so the LBM was modified to simulate flow over the representative volume element (REV) (Dardis and McCloskey, 1998, Spaid and Phelan, 1997, Freed, 1998)



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کلمات کلیدی:

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