Results of air-permeability testing in a vertical borehole at Yucca Mountain, Nevada
- Geological Survey, Denver, CO (United States)
- Geological Survey, Mercury, NV (United States)
Air-injection testing to determine air permeabilities was conducted in borehole UE-25 UZ No.16 as part of the Yucca Mountain Surface-Based Borehole Investigations Project. Air permeabilities of the rocks tested are: (1) Tiva Canyon Member; 2.0 E-13 m{sup 2} to 88.0 E-13 m{sup 2}; (2) Topopah Spring Member; 1.1 E-13 m{sup 2} to 12.0 E-13 m{sup 2}. Based on the moisture observed on the downhole equipment, the borehole wall is dry down to 268.3 meters below surface level and wet below this depth. Testing above 268.3 meters showed no wellbore storage or skin effects. Tests conducted below 268.3 meters showed both wellbore storage and skin effects. Tests that forced water out of the rock exhibited a characteristic pressure drop in the arithmetic pressure plots. The stabilization pressure of the steady-state testing following this pressure drop provides an estimate of the test interval in-situ capillary pressure. Permeabilities calculated from the steady-state period following the pressure drop were less than those calculated from the transient tests, because the steady-state analysis did not account for skin effects.
- Research Organization:
- American Society of Civil Engineers, New York, NY (United States); American Nuclear Society, La Grange Park, IL (United States)
- DOE Contract Number:
- AI08-92NV10874
- OSTI ID:
- 61002
- Report Number(s):
- CONF-940553--Vol.4
- Country of Publication:
- United States
- Language:
- English
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