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Macro- and micro-compression testing of shales

Journal Article · · Journal of Petroleum Science and Engineering
 [1];  [2];  [2];  [3];  [3]
  1. Univ. of Utah, Salt Lake City, UT (United States); University of Utah
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Here, macro- and micro-geomechanical properties of shales were investigated at millimeter- and micrometer-scale using an example of the Woodford Shale. Geomechanical properties, such as uniaxial (unconfined) compressive strength and Young's modulus, were quantified at the millimeter-scale and compared with results from micro-compression testing experiments of FIB-SEM-nanofabricated micro-pillars. Size-scale and compositional/structural heterogeneity effect on elasto-plastic deformation and failure behavior of shales were investigated. Also, relationship between elemental/mineral composition and unconfined compressive strength and Young's modulus, at a micrometer-scale, was discussed. It was shown that geomechanical properties of shales are scale-dependent and are strongly affected by compositional/structural anisotropy. In particular, micro-compression testing experiments showed non-uniformly distributed compressive strength and Young's modulus within the investigated Woodford Shale rock samples. It was demonstrated, that geomechanical properties of shales, investigated at the micrometer-scale, tend to be affected by different minerals and/or pores, while the same properties, investigated at the millimeter-scale, are governed by different micro-facies (and/or micro-fractures) present within the rock. This shows that geomechanical properties of shales can be dramatically different depending on the scale of investigation and compositional/structural heterogeneity of these rocks, and therefore are not easily transferable across the scales.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Multi-Scale Fluid-Solid Interactions in Architected and Natural Materials (MUSE); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0019285
OSTI ID:
1617883
Alternate ID(s):
OSTI ID: 1606472
Journal Information:
Journal of Petroleum Science and Engineering, Journal Name: Journal of Petroleum Science and Engineering Journal Issue: C Vol. 191; ISSN 0920-4105
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (19)

Geomechanical Characterization of Marcellus Shale journal April 2016
Instrumented nanoindentation and 3D mechanistic modeling of a shale at multiple scales journal January 2015
Fracability Estimation for Longmaxi Shale: Coupled Brittleness, Stress–Strain and Fracture journal July 2018
A GPU-accelerated package for simulation of flow in nanoporous source rocks with many-body dissipative particle dynamics journal February 2020
Pore system characterization of organic-rich shales using nanoscale-resolution 3D imaging journal December 2019
What controls the mechanical properties of shale rocks? – Part I: Strength and Young's modulus journal November 2015
What controls the mechanical properties of shale rocks? – Part II: Brittleness journal August 2016
A 3D peridynamic simulation of hydraulic fracture process in a heterogeneous medium journal September 2016
Microstructural and geomechanical analysis of Bakken shale at nanoscale journal May 2017
Confinement Effect on Porosity and Permeability of Shales journal January 2020
Many-body dissipative particle dynamics modeling of fluid flow in fine-grained nanoporous shales journal May 2017
Sample Dimensions Influence Strength and Crystal Plasticity journal August 2004
Geomechanical and petrophysical properties of mudrocks: introduction journal January 2017
Microscale Characterization of Mechanical Properties journal August 2007
Effect of mineralogy and organic matter on mechanical properties of shale journal August 2015
Mechanical properties of shale-gas reservoir rocks — Part 1: Static and dynamic elastic properties and anisotropy journal September 2013
Mechanical properties of shale-gas reservoir rocks — Part 2: Ductile creep, brittle strength, and their relation to the elastic modulus journal September 2013
Macroscale Mechanical and Microscale Structural Changes in Chinese Wufeng Shale With Supercritical Carbon Dioxide Fracturing journal December 2017
Fracture Characteristics and Change of Permeability Under the Influence of Natural Fractures: Experimental Study of Wufeng–Longmaxi Shale journal April 2018

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