Nuclear logging and geothermal log interpretation: formation temperature sonde evaluation

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The theory and methodology of the neutron-based technique for the determination of the formation temperature in geothermal fields are discussed. The feasibility of the method was demonstrated before start of the present development phase. The present work is intended to evaluate the response of the temperature probe in a simulated fracture porosity granite matrix at temperatures likely to be encountered in known geothermal reservoirs. An above ground borehole model has been designed and constructed. The effect of high ambient temperatures on the response of the neutron detectors in the probe mockup used in the measurements was investigated and used to ... continued below

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Pages: 61

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Ross, E.W.; Vagelatos, N.; Dickerson, J.M. & Nguyen, V. January 1, 1982.

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Description

The theory and methodology of the neutron-based technique for the determination of the formation temperature in geothermal fields are discussed. The feasibility of the method was demonstrated before start of the present development phase. The present work is intended to evaluate the response of the temperature probe in a simulated fracture porosity granite matrix at temperatures likely to be encountered in known geothermal reservoirs. An above ground borehole model has been designed and constructed. The effect of high ambient temperatures on the response of the neutron detectors in the probe mockup used in the measurements was investigated and used to correct the detector counts. An improved data analysis method has been developed to account properly for the effects of low porosity and high temperatures. Measurements, using the above ground borehole model, have shown that a linear correlation between the ratio of thermal counts from a Gd-filtered detector to counts from a bare detector and formation temperature is good at temperatures as high as 380/sup 0/F. The present results are consistent with earlier data obtained in high-porosity laboratory models at lower temperatures (T < 167/sup 0/F). Further measurements at high temperature at various porosities and formation neutron absorption cross sections would be necessary for a more extensive comparison.

Physical Description

Pages: 61

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NTIS, PC A04/MF A01.

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  • Other Information: Portions of document are illegible

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  • Other: DE82009074
  • Report No.: LA-9159-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5282226 | External Link
  • Office of Scientific & Technical Information Report Number: 5282226
  • Archival Resource Key: ark:/67531/metadc1066641

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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.

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  • January 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 30, 2018, 11:53 a.m.

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Ross, E.W.; Vagelatos, N.; Dickerson, J.M. & Nguyen, V. Nuclear logging and geothermal log interpretation: formation temperature sonde evaluation, report, January 1, 1982; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1066641/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.