Summary of recent flow testing of the Fenton Hill HDR Reservoir

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Through May of 1993, a sequence of reservoir flow tests has been conducted at our Fenton Hill Hot Dry Rock (HDR) test site as part of the Long-Term Flow Testing (LTFT) program. This testing, which extended over an aggregate period of about 8 months, has demonstrated several significant features concerning HDR reservoirs that taken together reflect very positively on the future development of the HDR concept into a viable commercial reality. Of most significance is the demonstrated self-regulating nature of the flow through such a reservoir. Both temperature and tracer data indicate that the flow, rather than concentrating in a … continued below

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113-116

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Brown, Donald W. January 20, 1994.

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Through May of 1993, a sequence of reservoir flow tests has been conducted at our Fenton Hill Hot Dry Rock (HDR) test site as part of the Long-Term Flow Testing (LTFT) program. This testing, which extended over an aggregate period of about 8 months, has demonstrated several significant features concerning HDR reservoirs that taken together reflect very positively on the future development of the HDR concept into a viable commercial reality. Of most significance is the demonstrated self-regulating nature of the flow through such a reservoir. Both temperature and tracer data indicate that the flow, rather than concentrating in a few potential direct flow paths, progressively shifted towards more indirect flow paths as the test proceeded. This self-regulating mechanism may be related to the strongly temperature-dependent viscosity of water. Measurements have shown that the reservoir flow impedance is concentrated in the near-wellbore region surrounding the production well. This situation may well be a blessing in disguise since this suggests that the distance between injection and production wells can be significantly increased, with a greatly enhanced access to fractured hot rock, without an undue impedance penalty. However, since the multiply interconnected joints within the HDR reservoir are held open by fluid pressure (pressurepropping), a higher mean reservoir pressure is the obvious path to increased productivity while still retaining the distributed nature of the flow. Other significant observations include a very small rate of reservoir water loss that was still declining at the end of the flow testing, and a set of temperature measurements in the production well that show no significant temperature drawdown during the period of testing.

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113-116

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  • Proceedings, nineteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 18-20, 1994

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  • Report No.: SGP-TR-147-16
  • Office of Scientific & Technical Information Report Number: 889130
  • Archival Resource Key: ark:/67531/metadc884667

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  • January 20, 1994

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  • May 8, 2019, 4:07 p.m.

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Brown, Donald W. Summary of recent flow testing of the Fenton Hill HDR Reservoir, article, January 20, 1994; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc884667/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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