Equivalent discrete fracture networks for modelling fluid flow in highly fractured rock mass

2017 ◽  
Vol 229 ◽  
pp. 21-30 ◽  
Author(s):  
Feng Ren ◽  
Guowei Ma ◽  
Lifeng Fan ◽  
Yang Wang ◽  
Hehua Zhu
Keyword(s):  
Fluid Flow ◽  
Rock Mass ◽  
Fractured Rock ◽  
Fracture Networks ◽  
Fractured Rock Mass ◽  
Discrete Fracture Networks ◽  
Discrete Fracture

Numerically Simulated Groundwater Age Distributions within Complex Flow Systems and Discrete Fracture Networks

2020 ◽  
Author(s):  
John Molson ◽  
Emil Frind
Keyword(s):  
Groundwater Age ◽  
Fractured Rock ◽  
Vertical Plane ◽  
Geochemical Evolution ◽  
Real Field ◽  
Fracture Networks ◽  
Complex Flow ◽  
Discrete Fracture Networks ◽  
Discrete Fracture ◽  
Flow Systems

<p>Numerical simulations of mean groundwater age are presented for a variety of complex flow systems including heterogeneous aquifers and discretely-fractured porous rock. We apply the finite element models FLONET/TR2 (in the 2D vertical plane) and SALTFLOW (in 3D systems), using the standard advection-dispersion equation with an age source term. The age simulations are applied in a variety of contexts including defining capture zones for pumping wells, characterizing fractured rock aquifers, and for improved understanding of flow systems and geochemical evolution. Applications include real field sites and hypothetical conceptual models. Comparisons are also made with advective particle-tracking derived ages which are much faster to compute but do not include dispersive age mixing. Control of numerical (age) dispersion is critical, especially within discrete fracture networks where high age gradients can develop between the fractures and matrix. The presentation will highlight the broad applications of mean groundwater age simulations and will show how they can be useful for providing insight into hydrogeological systems.</p>

scholarly journals Discontinuous Boundary Elements for Fluid Flow Problems in Discrete Fracture Networks

2019 ◽  
Author(s):  
Bin Wang ◽  
Yin Feng ◽  
Xu Zhou ◽  
Sandra Pieraccini ◽  
Stefano Scialò ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Domain Decomposition Method ◽  
Three Dimensional ◽  
Gas Production ◽  
Fracture Networks ◽  
Flow Problems ◽  
Discontinuous Boundary ◽  
Discrete Fracture Networks ◽  
Discrete Fracture ◽  
Element Method

Modeling fluid flow in three-dimensional (3D) Discrete Fracture Networks (DFNs) is of relevance in many engineering applications, such as hydraulic fracturing, oil/gas production, geothermal energy extraction, nuclear waste disposal and CO2 sequestration. A new Boundary Element Method (BEM) technique with discontinuous quadratic elements and a parallel Domain Decomposition Method (DDM) is presented herein for the simulation of the steady-state fluid flow in 3D DFN systems with wellbores, consisting of planar fractures having arbitrary properties and wellbore trajectories. Numerical examples characterized by DFNs of increasing complexity are investigated to evaluate the accuracy and efficiency of the presented technique. The results show that accurate solutions can be obtained with less nodes than with mesh-based methods (e.g. Finite Element Method). In addition, the DDM algorithm used provides a quite fast convergence. The simulation results of the fluid flow around intersections among traces (linear intersections between fractures), intersections between traces and a fracture boundaries, and wellbore intersections is accurate. Source code is available at : https://github.com/BinWang0213/PyDFN3D.

Assessment of fracture characteristics controlling fluid flow performance in discrete fracture networks (DFN)

2019 ◽  
Vol 178 ◽  
pp. 1104-1111 ◽  
Author(s):  
Yao Wenli ◽  
Mostafa Sharifzadeh ◽  
Zhen Yang ◽  
Guang Xu ◽  
Zhigang Fang
Keyword(s):  
Fluid Flow ◽  
Fracture Networks ◽  
Fracture Characteristics ◽  
Discrete Fracture Networks ◽  
Discrete Fracture
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