An implicitly coupled hydro-geomechanical model for hydraulic fracture simulation with the discontinuous deformation analysis

Morgan, W.E.; Aral, Mustafa M.

doi:10.1016/j.ijrmms.2014.09.021

Cited by 64 publications

(14 citation statements)

References 24 publications

(41 reference statements)

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“…Thus, the DFN seems to be more suitable to simulate the water flow in fractured rock masses, irrespective of its high demand of computer resource. As a matter of fact, DFN has already been implemented into several numerical methods to simulate water flow in fractured rock masses, such as distinct deformation analysis (DDA) [18,[18][19][20][21][22], numerical manifold method (NMM) [23,24], extended finite element method (XFEM) [25][26][27], and discrete element method (DEM) [28,29]. Compared with other numerical methods, DEM coupled with DFN shows the advantages of simulating water flow through fractured rock masses, since it is capable of simulating coupled hydromechanical effect and, especially, massive fractures.…”

Section: Literature Review About Nuclide Transport Simulationmentioning

confidence: 99%

Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses

Liu

Chan

et al. 2017

Geofluids

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It is essential to study nuclide transport with underground water in fractured rock masses in order to evaluate potential radionuclide leakage in nuclear waste disposal. A time-domain random-walk (TDRW) method was firstly implemented into a discrete element method (DEM), that is, UDEC, in this paper to address the pressing challenges of modelling the nuclide transport in fractured rock masses such as massive fractures and coupled hydromechanical effect. The implementation was then validated against analytical solutions for nuclide transport in a single fracture and a simple fracture network. After that, the proposed implementation was applied to model the nuclide transport in a complex fracture network investigated in the DECOVALEX 2011 project to analyze the effect of matrix diffusion and stress on the nuclide transport in the fractured rock masses. It was concluded that the implementation of the TDRW method into UDEC provided a valuable tool to study the nuclide transport in the fractured rock masses. Moreover, it was found that the total travel time of the nuclide particles in the fractured rock masses with the matrix diffusion and external stress modelled was much longer than that without the matrix diffusion and external stress modelled.

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Section: Literature Review About Nuclide Transport Simulationmentioning

confidence: 99%

Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses

Liu

Chan

et al. 2017

Geofluids

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“…The major difference of this pore pressure from the bottom hole pressure obtained in the field (Jeffrey et al 1995), or indoor experiments (Abass et al 1996), is that there is a sudden increase and it slightly drops to a stable value. This is because it is the real time pore pressure simulated within the rock and exhibits a different phenomenon (Ji et al 2009, Morgan et al 2015. Another reason could be that the permeability of the fractured element has been increased immediately after it is cracked, so the increased permeability could lead an increase in the pore pressure.…”

Section: Effect Of Poisson's Ratiomentioning

confidence: 99%

Numerical analysis of the material parameter effects on the initiation of hydraulic fracture in a near wellbore region

Xing

2015

Journal of Natural Gas Science and Engineering

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Please cite this article as: Li, Q., Xing, H., Numerical analysis of the material parameter effects on the initiation of hydraulic fracture in a near wellbore region, Journal of Natural Gas Science & Engineering (2015), doi: 10.1016/j.jngse.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract: Hydraulic fracturing is recognized as a key method to enhance unconventional reservoirs, but it is also quite complicated and challenging due to so many affecting factors such as the formation material parameters, fluid behaviors and geological setting/conditions. However, in unconventional reservoirs, in the near wellbore region, the rock may consist of different materials, and the stress is redistributed during drilling and fracturing process, so the preferable hydraulic fracture path is hard to predict. This paper aims to study the effects of formation material parameters, including drilling effects, on the hydraulic fracturing process in unconventional reservoirs. First, hydraulic fracturing has been simulated in nine cases with different parameters specifically permeability, porosity, Young's modulus, and Poisson's ratio. Then hydraulic fracturing has been studied by a heterogeneous model with multiple zones and layers, and complex stress condition. It is found that under a constant hydraulic pressure boundary, when the values of permeability, porosity, Young's modulus, and Poisson's ratio are higher, hydraulic fracturing initiates earlier; with a heterogeneous distribution of materials, stress concentration is formed between different materials, and the tensile stress concentrated areas become the preferable paths of hydraulic fracturing. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT

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“…Over the past several decades, a great number of progresses have been made on DDA. These improvements are mostly concentrated on suppressing the false volume expansion, strengthening the deformability, scrutinizing the time integral scheme, refining the stress distribution, imposing the boundary conditions, fracturing the jointed rock mass, coupling the fluid and solid, accelerating the convergence of open‐close iteration, enhancing the contact search, optimizing the transformation of vertex‐vertex contact, and improving the calculation of contact force …”

Section: Introductionmentioning

confidence: 99%

Variational inequality‐based particle discontinuous deformation analysis

Fan

Wang

Zheng

2019

Num Anal Meth Geomechanics

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Summary Orienting the circular and rigid particle medium, the variational inequality‐based discontinuous deformation analysis (DDA) is established. In the proposed DDA, the global stiffness matrix, the penalty parameters, and the open‐close iteration are successfully avoided. The contact constraint is transferred into the problem of variational or quasi‐variational inequalities. And explicit variational expression on the contact force is firstly established. To speed up the rate of solving contact force, on the basis of the two‐stage prediction‐correction method, we design a compatibility iteration algorithm (PPC‐CI). The C++ code is developed in multicore environment through the open multi‐processing (OpenMP) in order to take advantage of the parallelizable features of the new DDA. Numerical tests suggest that the presented DDA is effective and promising.

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An implicitly coupled hydro-geomechanical model for hydraulic fracture simulation with the discontinuous deformation analysis

Cited by 64 publications

References 24 publications

Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses

Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses

Numerical analysis of the material parameter effects on the initiation of hydraulic fracture in a near wellbore region

Variational inequality‐based particle discontinuous deformation analysis

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