CT scanning and flow measurements of shale fractures after multiple shearing events
- National Energy Technology Lab. (NETL), Morgantown, WV (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States); ; AECOM, Morgantown, WV (United States)
- 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
Web of Science
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 |
Similar Records
Gouge formation and dilation impacts to flow during fracture shearing
Rapid Mineral Precipitation During Shear Fracturing of Carbonate-Rich Shales