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Neutron imaging: a new possibility for laboratory observation of hydraulic fractures in shale?

Roshankhah, S. and Marshall, J. P. and Tengattini, A. and Ando, E. and Rubino, V. and Rosakis, A. J. and Viggiani, G. and Andrade, J. E. (2018) Neutron imaging: a new possibility for laboratory observation of hydraulic fractures in shale? Géotechnique Letters, 8 (4). pp. 316-323. ISSN 2045-2543. https://resolver.caltech.edu/CaltechAUTHORS:20190117-081917303

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Abstract

Hydraulic fracturing, the creation of fractures by high-pressure fluid injection into a solid medium, is of interest to enhance the permeability of rocks. This complex three-dimensional hydro-mechanical process, however, has only been studied in the laboratory by boundary measurements or acoustic techniques with low spatio-temporal resolutions until now. In this paper, direct, high spatial resolution, and near real-time visualisation results of hydraulic fracture generation and propagation in prismatic specimens of Marcellus shale rock under in situ conditions (70 MPa, plane strain) are presented. Poly-methyl methacrylate specimens are also tested under the same conditions to highlight the importance of rocks' internal structure on the response of the tested rock. The results reveal a complex interaction among the injected fluid, the pre-existing natural fractures in shale structure, and the hydraulically induced fracture highlighting the governing role of rock fabric even under high stresses. These measurements are possible due to the unique sensitivity of neutrons to water. Besides the intrinsic interest of the results presented, this exploratory investigation highlights the potential of neutron imaging in elucidating the evolution of fluid flow and fluid-driven fractures, as X-rays have done for the evolution of solid structure only. Further, understanding of the mechanics of fracking will lead to development of more accurate hydro-mechanical constitutive models thus enabling the design of field operations with higher efficiencies.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1680/jgele.18.00129DOIArticle
ORCID:
AuthorORCID
Roshankhah, S.0000-0002-1160-7882
Marshall, J. P.0000-0001-6208-1801
Rubino, V.0000-0002-4023-8668
Rosakis, A. J.0000-0003-0559-0794
Additional Information:© 2018 ICE Publishing. Published Online: December 21, 2018.
Subject Keywords:laboratory tests; monitoring; rocks/rock mechanics
Issue or Number:4
Record Number:CaltechAUTHORS:20190117-081917303
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190117-081917303
Official Citation:Neutron imaging: a new possibility for laboratory observation of hydraulic fractures in shale? S. Roshankhah, J. P. Marshall, A. Tengattini, E. Ando, V. Rubino, A. J. Rosakis, G. Viggiani, and J. E. Andrade Géotechnique Letters 2018 8:4, 316-323, doi: 10.1680/jgele.18.00129
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92334
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Jan 2019 22:48
Last Modified:09 Mar 2020 13:19

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