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

PDF Version Also Available for Download.

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 ... continued below

Physical Description

pages 50-53

Creation Information

Lockner, D.; Bartz, D. & Byerlee, J. January 1, 1978.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

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

Source

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

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: SGP-TR-30
  • Report No.: CONF-781222-7
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 892137
  • Archival Resource Key: ark:/67531/metadc882175

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • January 1, 1978

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

Description Last Updated

  • Nov. 22, 2016, 10:11 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 1
Total Uses: 2

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Lockner, D.; Bartz, D. & Byerlee, J. Changes in permeability during flow of water through granite subjected to a temperature gradient, article, January 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc882175/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.