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Title: CT scanning and flow measurements of shale fractures after multiple shearing events

Journal Article · · International Journal of Rock Mechanics and Mining Sciences
 [1];  [2];  [3];  [4]
  1. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)
  3. National Energy Technology Lab. (NETL), Morgantown, WV (United States); ; AECOM, Morgantown, WV (United States)
  4. National Energy Technology Lab. (NETL), Morgantown, WV (United States); National Energy Technology Lab. (NETL), Morgantown, WV (United States); The MITRE Corp., McLean, VA (United States)

A shearing apparatus was used in conjunction with a Hassler-style core holder to incrementally shear fractured shale cores while maintaining various confining pressures. Computed tomography scans were performed after each shearing event, and were used to obtain information on evolving fracture geometry. Fracture transmissivity was measured after each shearing event to understand the hydrodynamic response to the evolving fracture structure. The digital fracture volumes were used to perform laminar single phase flow simulations (local cubic law with a tapered plate correction model) to qualitatively examine small scale flow path variations within the altered fractures. Fractures were found to generally increase in aperture after several shear slip events, with corresponding transmissivity increases. Lower confining pressure resulted in a fracture more prone to episodic mechanical failure and sudden changes in transmissivity. Conversely, higher confining pressures resulted in a system where, after an initial setting of the fracture surfaces, changes to the fracture geometry and transmissivity occurred gradually. Flow paths within the fractures are largely controlled by the location and evolution of zero aperture locations. Lastly, a reduction in the number of primary flow pathways through the fracture, and an increase in their width, was observed during all shearing tests.

Research Organization:
National Energy Technology Lab. (NETL), Morgantown, WV (United States); Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1440317
Alternate ID(s):
OSTI ID: 1409310; OSTI ID: 1549449
Report Number(s):
NETL-PUB-20420; PII: S136516091630449X
Journal Information:
International Journal of Rock Mechanics and Mining Sciences, Vol. 100, Issue C; ISSN 1365-1609
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (3)

Design and implementation of a shearing apparatus for the experimental study of shear displacement in rocks journal April 2018
Assessment of Hydraulic Connectivity of Fractures in Mudstones by Single‐Borehole Investigations journal May 2018
Spatial Mapping of Fracture Aperture Changes With Shear Displacement Using X‐ray Computerized Tomography journal July 2019

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