Forced oscillations of the Los Alamos Scientific Laboratory's dry hot rock geothermal reservoir

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Equations of motion are derived for the Los Alamos Scientific Laboratory's geothermal reservoir consisting of an elastic half-space (rock), with an open vertical pipe from the surface connected at depth with a vertical penny-shaped fracture. This reservoir, which is filled with water (laminar flow through a pipe), is subjected to seismic waves and/or blast-like impulses applied downhole. Oscillations (responses) of the water column, of the downhole internal net pressure required to keep the fracture open, and of the fracture itself, are found for the reservoir. If the fracture is continuously oscillated subject to pressure waves applied downhole and failure of ... continued below

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Medium: P; Size: Pages: 6

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Hsu, Y.C. November 1, 1975.

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Description

Equations of motion are derived for the Los Alamos Scientific Laboratory's geothermal reservoir consisting of an elastic half-space (rock), with an open vertical pipe from the surface connected at depth with a vertical penny-shaped fracture. This reservoir, which is filled with water (laminar flow through a pipe), is subjected to seismic waves and/or blast-like impulses applied downhole. Oscillations (responses) of the water column, of the downhole internal net pressure required to keep the fracture open, and of the fracture itself, are found for the reservoir. If the fracture is continuously oscillated subject to pressure waves applied downhole and failure of the fracture surface occurs, it is usually through fatigue after a long period of time. Of concern next is transient oscillation of the fracture when down-hole blast-like impulses are applied. Of particular concern is the maximum amplitude, G/sub max/, of the fracture (crack) oscillation in early cycles. Generally, failure due to G/sub max/ is attributed singly to the strength of the fractured rock being exceeded. Since the period, tau, of the oscillations is sensitive to the radius, R, of the fracture, experimental determination of tau, in conjunction with Eq. (20), will permit R to be evaluated accurately. (auth)

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Medium: P; Size: Pages: 6

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  • Report No.: LA-6170-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5001938 | External Link
  • Office of Scientific & Technical Information Report Number: 5001938
  • Archival Resource Key: ark:/67531/metadc1060199

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  • November 1, 1975

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

Description Last Updated

  • Feb. 2, 2018, 2:38 p.m.

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Hsu, Y.C. Forced oscillations of the Los Alamos Scientific Laboratory's dry hot rock geothermal reservoir, report, November 1, 1975; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1060199/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.