Changes in permeability during flow of water through granite subjected to a temperature gradient Metadata

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Title

  • Main Title Changes in permeability during flow of water through granite subjected to a temperature gradient

Creator

  • Author: Lockner, D.
    Creator Type: Personal
  • Author: Bartz, D.
    Creator Type: Personal
  • Author: Byerlee, J.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: US Geological Survey, Menlo Park, CA
    Place of Publication: United States

Date

  • Creation: 1978-01-01

Language

  • English

Description

  • Content Description: The useful lifetime of a geothermal reservoir as an energy source can depend strongly on the technique used to extract heat. In both naturally occurring geothermal fields and artificial geothermal reservoirs, such as the Los Alamos hot dry rock experimental continuous extraction of heat requires maintenance of a channel of permeable material to and away from the heat source. Since such a system must be recharged to maintain production over a useful period of time, water must be heated and thus transported through rock in the presence of large temperature gradients. We have designed experiments to study permeability changes in rock due to fluid flow along a temperature gradient to further understanding of how heat production in geothermal reservoirs may depend on these effects. Cylindrical samples of Westerly Granite, 8.9 cm long, 7.6 cm in diameter, and containing a 0.66 cm diameter borehole, were used. A resistance heater was placed in the borehole as a heat source, giving a radially symmetric temperature gradient. Confining pressure and pore pressure were applied to the sample; a pore pressure gradient was applied to induce radial flow either toward or away from the borehole. Although permeability may not have remained homogeneous during the experiments, an apparent permeability, averaged over the whole sample, was calculated from Darcy's Law by measuring the pore fluid flow rate.
  • Physical Description: pages 50-53

Subject

  • Keyword: Granites
  • STI Subject Categories: 02 Petroleum
  • Keyword: Geothermal Fields
  • Keyword: Boreholes
  • Keyword: Fluid Flow
  • Keyword: Reservoir Engineering
  • Keyword: Heaters
  • Keyword: Temperature Gradients
  • Keyword: Maintenance
  • Keyword: Production
  • Keyword: Heat Sources
  • STI Subject Categories: 15 Geothermal Energy
  • Keyword: Lifetime
  • Keyword: Permeability
  • Keyword: Pore Pressure
  • Keyword: Water Geothermal Legacy
  • Keyword: Geothermal Legacy
  • Keyword: Energy Sources

Source

  • Conference: Proceedings fourth workshop geothermal reservoir engineering, Stanford, CA, December 13-15, 1978

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: SGP-TR-30
  • Report No.: CONF-781222-7
  • Office of Scientific & Technical Information Report Number: 892137
  • Archival Resource Key: ark:/67531/metadc882175
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