KG²B, a collaborative benchmarking exercise for estimating the permeability of the Grimsel granodiorite – Part 1: measurements, pressure dependence and pore-fluid effects

David, Christian; Wassermann, J.; Amann, Florian; Lockner, D. A.; Rutter, E. H.; Vanorio, Tiziana; Hildenbrand, A.; Billiotte, Joël; Reuschlé, Thierry; Lasseux, Didier; Fortin, Jérôme; Lenormand, R.; Selvadurai, A. P. S.; Meredith, P. G.; Browning, John; Mitchell, Thomas M.; Loggia, D.; Nono, Frank; Sarout, Joël; Esteban, Lionel; Davy, Catherine; Louis, L.; Boitnott, G. N.; Madonna, Claudio; Jahns, Eberhard; Fleury, Marc; Berthe, Guillaume; Delage, Pierre; Braun, Philipp; Grégoire, David; Perrier, Laurent; Polito, P. J.; Jannot, Yves; Sommier, Alain; Krooß, Bernhard M.; Fink, Reinhard; Hu, Qinhong; Klaver, Jop; Clark, Anthony C.

doi:10.1093/gji/ggy304

Cited by 18 publications

(19 citation statements)

References 62 publications

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“…The operation of hydraulic fracture in the naturally fracture gas reservoirs has some complications due to the presence of natural fractures. Various complex fracturing models of naturally fractured formations have been developed to describe the complex interaction mechanism between NFs and HFs, such as the boundary element method (BEM) (Goodfellow et al 2015;David et al 2018), discrete element method (DEM) (Gehne and Benson 2017;Benson 2004) and the finite element method (FEM) based on the cohesive zone method (CZM).…”

Section: Methodsmentioning

confidence: 99%

“…Today, the term "finite difference" is used as the synonym for the derivation of finite difference, especially in the field of numerical methods. The finite difference approximation, in fact, is the same outside of the differential divisions in the terminology used above (David et al 2018;Gehne and Benson 2017;Benson 2004).…”

Section: Finite Difference Numerical Methodsmentioning

confidence: 99%

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A numerical investigation on the performance of hydraulic fracturing in naturally fractured gas reservoirs based on stimulated rock volume

Al-Rubaye

Mahmud

2020

J Petrol Explor Prod Technol

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All reservoirs are fractured to some degree. Depending on the density, dimension, orientation and the cementation of natural fractures and the location where the hydraulic fracturing is done, preexisting natural fractures can impact hydraulic fracture propagation and the associated flow capacity. Understanding the interactions between hydraulic fracture and natural fractures is crucial in estimating fracture complexity, stimulated reservoir volume, drained reservoir volume and completion efficiency. However, because of the presence of natural fractures with diffuse penetration and different orientations, the operation is complicated in naturally fractured gas reservoirs. For this purpose, two numerical methods are proposed for simulating the hydraulic fracture in a naturally fractured gas reservoir. However, what hydraulic fracture looks like in the subsurface, especially in unconventional reservoirs, remain elusive, and many times, field observations contradict our common beliefs. In this study, the hydraulic fracture model is considered in terms of the state of tensions, on the interaction between the hydraulic fracture and the natural fracture (45°), and the effect of length and height of hydraulic fracture developed and how to distribute induced stress around the well. In order to determine the direction in which the hydraulic fracture is formed strikethrough, the finite difference method and the individual element for numerical solution are used and simulated. The results indicate that the optimum hydraulic fracture time was when the hydraulic fracture is able to connect natural fractures with large streams and connected to the well, and there is a fundamental difference between the tensile and shear opening. The analysis indicates that the growing hydraulic fracture, the tensile and shear stresses applied to the natural fracture.

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Section: Methodsmentioning

confidence: 99%

Section: Finite Difference Numerical Methodsmentioning

confidence: 99%

A numerical investigation on the performance of hydraulic fracturing in naturally fractured gas reservoirs based on stimulated rock volume

Al-Rubaye

Mahmud

2020

J Petrol Explor Prod Technol

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“…The estimation of the permeability of granitic rocks is usually accomplished by conducting either steady state or transient hydraulic pulse tests on cores of the rock. The literature on the topic is extensive and these include the seminal studies by Brace et al [87] and extensive references to further work in permeability estimation are given in [73,[75][76][77][78][79][80][81][82][83][84][88][89][90][91][92][93]. The role of pore fluid migration in plutonic rocks, in particular during their creation, is discussed in [94].…”

Section: Introductionmentioning

confidence: 99%

Estimates for the Effective Permeability of Intact Granite Obtained from the Eastern and Western Flanks of the Canadian Shield

2020

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Granitic rock from the western part of the Canadian Shield is considered as a potential host rock for the siting of a deep geological repository for the storage of heat-emitting high-level nuclear fuel waste. The research program focused on the use of surface permeability measurements conducted at 54 locations on a 300 mm cuboid of granite, obtained from the Lac du Bonnet region in Manitoba, to obtain an estimate for the effective permeability of the cuboid. Companion experiments are conducted on a 280 mm cuboid of granite obtained from Stanstead, Quebec, located in the eastern part of the Canadian Shield. The surface permeabilities for the cuboids of granite are developed from theoretical relationships applicable to experimental situations where steady flow is initiated at a sealed annular surface region with a pressurized central domain. The experimental values for the surface permeability are used with a kriging procedure to estimate the permeability variations within the cuboidal region. The spatial variations of permeability are implemented in computational models of the cuboidal regions to determine the one-dimensional permeabilities in three orthogonal directions. The effective permeability of the granite cuboids is estimated by appeal to the geometric mean. The research provides a non-destructive methodology for estimating the effective permeability of large specimens of rock and the experiments performed give estimates for the effective permeability of the two types of granitic rock obtained from the western and eastern flanks of the Canadian Shield.

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“…The studies in this area are numerous and no attempt will be made to provide a comprehensive survey of past and recent developments. Advances in the area of poroelasticity and its applications to problems in geomechanics in particular are given by Yue and Selvadurai (1995), Selvadurai (1996), Selvadurai (2007), Wang (2000), Verruijt (2015), Cheng (2015), , Selvadurai and Suvorov (2016), and others. The basic development of the classical theory of poroelasticity relies on constitutive assumptions of Hookean elastic behaviour of the porous skeleton and Darcy flow through the porous medium.…”

Section: Introductionmentioning

confidence: 99%

“…If Biot's classi-P. Selvadurai et al: A multi-phasic approach for estimating the Biot coefficient cal theory of poroelasticity is accepted, values of α cannot be greater than unity. Such a value would imply that either K D < 0 or K S < 0, which would violate the positive definiteness arguments for the strain energy of an elastic porous skeleton (Davis and Selvadurai, 1996;Selvadurai, 2000) with no locked-in self equilibrating stresses (i.e. the skeleton expands under compressive isotropic stresses).…”

Section: Introductionmentioning

confidence: 99%

A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

Selvadurai

Nejati

2019

Solid Earth

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Abstract. This paper presents an alternative approach for estimating the Biot coefficient for the Grimsel granite, which appeals to the multi-phasic mineralogical composition of the rock. The modelling considers the transversely isotropic nature of the rock that is evident from both the visual appearance of the rock and determined from mechanical testing. Conventionally, estimation of the compressibility of the solid material is performed by fluid saturation of the pore space and pressurization. The drawback of this approach in terms of complicated experimentation and influences of the unsaturated pore space is alleviated by adopting the methods for estimating the solid material compressibility using developments in theories of multi-phase materials. The results of the proposed approach are compared with estimates available in the literature.

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KG²B, a collaborative benchmarking exercise for estimating the permeability of the Grimsel granodiorite – Part 1: measurements, pressure dependence and pore-fluid effects

Cited by 18 publications

References 62 publications

A numerical investigation on the performance of hydraulic fracturing in naturally fractured gas reservoirs based on stimulated rock volume

A numerical investigation on the performance of hydraulic fracturing in naturally fractured gas reservoirs based on stimulated rock volume

Estimates for the Effective Permeability of Intact Granite Obtained from the Eastern and Western Flanks of the Canadian Shield

A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

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