Injection-Sensitive Mechanics of Hydraulic Fracture Interaction with Discontinuities

Chuprakov, Dimitry; Melchaeva, Olga; Prioul, Romain

doi:10.1007/s00603-014-0596-7

Cited by 138 publications

(70 citation statements)

References 36 publications

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“…Also, for all of these models, one of the greatest challenges lies in appropriately defining the conditions under which a hydraulic fracture will cross each natural fracture it encounters. Because this issue is essentially one of physics and not of numerical simulation per se, we will not attempt to review the large relevant literature but will instead refer to the review provided by Chuprakov et al (2014). Suffice it to say, however, that regardless of the simulation method, this choice of crossing condition may have a predominant impact on the numerical predictions (Kresse et al, 2013).…”

Section: Engineering Modelsmentioning

confidence: 99%

Numerical methods for hydraulic fracture propagation: A review of recent trends

Lecampion

Bunger

Zhang

2018

Journal of Natural Gas Science and Engineering

353

172

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Section: Engineering Modelsmentioning

confidence: 99%

Numerical methods for hydraulic fracture propagation: A review of recent trends

Lecampion

Bunger

Zhang

2018

Journal of Natural Gas Science and Engineering

353

172

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“…(1) The shale under consideration is an isotropic and brittle medium ( Chuprakov et al, 2014 ). Therefore, linear elastic fracture mechanics is applicable.…”

Section: Description Of the Problemmentioning

confidence: 99%

“…Factors such as pre-existing cracks, bedding planes, frictional effect, crustal stresses, and liquid-solid interaction may collectively influence the propagation of a hydraulic crack ( Warpinski and Teufel, 1987;Zhang and Jeffrey, 2006;Bunger and Detournay, 2008;Chuprakov et al, 2014 ). Such complexity renders it difficult to carry out theoretical analysis, and numerical methods were broadly employed to examine the hydraulic fracture: Zhang et al (2007), Olson (2011, 2014 ), Weng et al (2011), Kresse et al (2013), Guo et al (2015) and Zou et al (2016) simulated the interaction between a hydraulic fracture and frictional or sealed natural cracks.…”

Section: Introductionmentioning

confidence: 99%

Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking

Zeng

Wei

2017

Journal of the Mechanics and Physics of Solids

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a b s t r a c tDriven by the rapid progress in exploiting unconventional energy resources such as shale gas, there is growing interest in hydraulic fracture of brittle yet heterogeneous shales. In particular, how hydraulic cracks interact with natural weak zones in sedimentary rocks to form permeable cracking networks is of significance in engineering practice. Such a process is typically influenced by crack deflection, material anisotropy, crack-surface friction, crustal stresses, and so on. In this work, we extend the He-Hutchinson theory (He and Hutchinson, 1989) to give the closed-form formulae of the strain energy release rate of a hydraulic crack with arbitrary angles with respect to the crustal stress. The critical conditions in which the hydraulic crack deflects into weak interfaces and exhibits a dependence on crack-surface friction and crustal stress anisotropy are given in explicit formulae. We reveal analytically that, with increasing pressure, hydraulic fracture in shales may sequentially undergo friction locking, mode II fracture, and mixed mode fracture. Mode II fracture dominates the hydraulic fracturing process and the impinging angle between the hydraulic crack and the weak interface is the determining factor that accounts for crack deflection; the lower friction coefficient between cracked planes and the greater crustal stress difference favor hydraulic fracturing. In addition to shale fracking, the analytical solution of crack deflection could be used in failure analysis of other brittle media.

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“…For decades, laboratory experiments have been used to study hydraulic fracturing using freshwater as a fracturing fluid [3,[16][17][18][19][20][21][22]. Various studies [23][24][25][26][27][28][29] investigated important factors (such as rock structure, in situ stress, viscosity, and the injection rate of a fracturing fluid) that affect the hydraulic fracturing process.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Hydraulic Fracturing in Shale Considering Anisotropy and Using Freshwater and Supercritical CO2

Afolagboye

Lin

et al. 2018

Energies

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Abstract:The process of hydraulic fracturing makes use of a liquid to fracture reservoir rocks for the exploitation of unconventional resources. Hence, it is vital to understand the processes that produce the fracture networks that occur during hydraulic fracturing. A shale reservoir is one of the largest unconventional resources and it displays obvious anisotropic characteristics due to its inherent sedimentary structures. The viscosity and flow ability of the fracturing fluid plays an important role in this process. We conducted a series of hydraulic fracturing tests on shale cores (from the southern Sichuan Basin) using freshwater and supercritical CO 2 (SCO 2 ) as fracturing fluids to investigate the different modes of fracture propagation. The pump pressure curves that we obtained during the fracturing experiment show how the shale responded to each of the fracturing fluids. We examined the influence of the anisotropic characteristics on the propagation of hydraulic fractures by conducting a series of hydraulic fracturing experiments on the shale cores using different bedding orientations. The bedding orientation of the shale had a profound influence on the fracture propagation when using either freshwater or a SCO 2 fluid. The breakdown pressure of the shale core was affected not only by the bedding orientation but also by the fracturing fluid. A macroscopic observation of the fractures revealed different fracture geometries and propagation patterns. The results demonstrated that the anisotropic structures and the fracturing fluids could influence the path of the hydraulic fracture.

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Injection-Sensitive Mechanics of Hydraulic Fracture Interaction with Discontinuities

Cited by 138 publications

References 36 publications

Numerical methods for hydraulic fracture propagation: A review of recent trends

Numerical methods for hydraulic fracture propagation: A review of recent trends

Crack deflection in brittle media with heterogeneous interfaces and its application in shale fracking

An Experimental Investigation of Hydraulic Fracturing in Shale Considering Anisotropy and Using Freshwater and Supercritical CO2

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