A Dynamic Discrete Fracture Model for Fluid Flow in Fractured Low-Permeability Reservoirs

2015 ◽  
Author(s):  
Zhengdong Lei ◽  
Bin Gong ◽  
Fang Wang ◽  
Tingting Wang ◽  
Qianshan Li
Keyword(s):  
Fluid Flow ◽  
Fracture Model ◽  
Low Permeability ◽  
Discrete Fracture Model ◽  
Discrete Fracture ◽  
Low Permeability Reservoirs

A Dynamic Discrete Fracture Model for Simulation of Tight Low-Permeability Reservoirs

2014 ◽  
Author(s):  
Zhengdong Lei ◽  
Changbing Tian ◽  
Fang Wang ◽  
Wenhuan Wang ◽  
Huanhuan Peng ◽  
...  
Keyword(s):  
Fracture Model ◽  
Low Permeability ◽  
Discrete Fracture Model ◽  
Discrete Fracture ◽  
Low Permeability Reservoirs

A Dynamic Discrete Fracture Model for Simulation of Tight Low-Permeability Reservoirs

2014 ◽  
Author(s):  
Zhengdong Lei ◽  
Changbing Tian ◽  
Fang Wang ◽  
Wenhuan Wang ◽  
Huanhuan Peng ◽  
...  
Keyword(s):  
Fracture Model ◽  
Low Permeability ◽  
Discrete Fracture Model ◽  
Discrete Fracture ◽  
Low Permeability Reservoirs

scholarly journals Study on a Dual Embedded Discrete Fracture Model for Fluid Flow in Fractured Porous Media

2020 ◽  
Vol 124 (1) ◽  
pp. 5-21
Author(s):  
Heng Zhang ◽  
Tingyu Li ◽  
Dongxu Han ◽  
Daobing Wang ◽  
Dongliang Sun ◽  
...  
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Fractured Porous Media ◽  
Fracture Model ◽  
Discrete Fracture Model ◽  
Discrete Fracture

scholarly journals Development of an Efficient Embedded Discrete Fracture Model for 3D Compositional Reservoir Simulation in Fractured Reservoirs

SPE Journal ◽  
2013 ◽  
Vol 19 (02) ◽  
pp. 289-303 ◽  
Author(s):  
Ali Moinfar ◽  
Abdoljalil Varavei ◽  
Kamy Sepehrnoori ◽  
Russell T. Johns
Keyword(s):  
Fluid Flow ◽  
Oil Recovery ◽  
Fractured Reservoirs ◽  
Naturally Fractured Reservoirs ◽  
Fracture Model ◽  
Continuum Models ◽  
Fine Grid ◽  
Discrete Fracture Model ◽  
Discrete Fracture ◽  
Naturally Fractured

Summary Many naturally fractured reservoirs around the world have depleted significantly, and improved-oil-recovery (IOR) processes are necessary for further development. Hence, the modeling of fractured reservoirs has received increased attention recently. Accurate modeling and simulation of naturally fractured reservoirs (NFRs) is still challenging because of permeability anisotropies and contrasts. Nonphysical abstractions inherent in conventional dual-porosity and dual-permeability models make them inadequate for solving different fluid-flow problems in fractured reservoirs. Also, recent technologies for discrete fracture modeling may suffer from large simulation run times, and the industry has not used such approaches widely, even though they give more-accurate representations of fractured reservoirs than dual-continuum models. We developed an embedded discrete fracture model (DFM) for an in-house compositional reservoir simulator that borrows the dual-medium concept from conventional dual-continuum models and also incorporates the effect of each fracture explicitly. The model is compatible with existing finite-difference reservoir simulators. In contrast to dual-continuum models, fractures have arbitrary orientations and can be oblique or vertical, honoring the complexity of a typical NFR. The accuracy of the embedded DFM is confirmed by comparing the results with the fine-grid, explicit-fracture simulations for a case study including orthogonal fractures and a case with a nonaligned fracture. We also perform a grid-sensitivity study to show the convergence of the method as the grid is refined. Our simulations indicate that to achieve accurate results, the embedded discrete fracture model may only require moderate mesh refinement around the fractures and hence offers a computationally efficient approach. Furthermore, examples of waterflooding, gas injection, and primary depletion are presented to demonstrate the performance and applicability of the developed method for simulating fluid flow in NFRs.

A Cut-Cell Polyhedral Finite Element Model for Coupled Fluid Flow and Mechanics in Fractured Reservoirs

SPE Journal ◽  
2021 ◽  
pp. 1-24
Author(s):  
I Shovkun ◽  
H. A. Tchelepi
Keyword(s):  
Finite Element ◽  
Fluid Flow ◽  
Fractured Reservoirs ◽  
Mechanical Deformation ◽  
Fracture Model ◽  
Single Fracture ◽  
Discrete Fracture Model ◽  
Cut Cell ◽  
Flux Approximation ◽  
Discrete Fracture

Summary Mechanical deformation induced by injection and withdrawal of fluids from the subsurface can significantly alter the flow paths in naturally fractured reservoirs. Modeling coupled fluid flow and mechanical deformation in fractured reservoirs relies on either sophisticated gridding techniques or enhancing the variables (degrees of freedom) that represent the physics to describe the behavior of fractured formation accurately. The objective of this study is to develop a spatial discretization scheme that cuts the “matrix” grid with fracture planes and utilizes traditional formulations for fluid flow and geomechanics. The flow model uses the standard low-order finite volume method with the compartmental embedded discrete fracture model (cEDFM). Due to the presence of nonstandard polyhedra in the grid after cutting/splitting, we use numerical harmonic shape functions within a polyhedral finite element (PFE) formulation for mechanical deformation. To enforce fracture-contact constraints, we use a penalty approach. We provide a series of comparisons between the approach that uses conforming unstructured grids and an unstructured discrete fracture model (uDFM) with the new cut-cell PFE formulation. The manuscript validates and compares both methods for linear elastic, single-fracture slip, and Mandel’s problems with tetrahedral, Cartesian, and perpendicular-bisectional (PBI) grids. Finally, the paper presents a fully coupled 3D simulation with multiple inclined intersecting faults activated in shear by fluid injection, which caused an increase in effective reservoir permeability. Our approach allows for great reduction in the complexity of the (gridded) model construction while retaining the solution accuracy together with great savings in the computational cost compared with uDFM. The flexibility of our model with respect to the types of grid polyhedra allows us to eliminate mesh artifacts in the solution of the transport equations typically observed when using tetrahedral grids and two-point flux approximation.

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