A comparison of two heat transfer models for estimating thermal drawdown in Hot Dry Rock reservoirs

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Estimates of thermal drawdown in Hot Dry Rock geothermal systems have been made with two different models of heat transfer from hydraulically fractured reservoir rock blocks to water circulated through the fracture permeability. One model is based on deconvolution of experimental tracer response curves into a network of flowpaths connected in parallel with heat transfer calculated individually in each flowpath. The second model is based on one-dimensional flow through the rock with a block size distribution described as a group of equivalent-radius spheres for which the heat transfer equations can be solved analytically. The two models were applied to the ... continued below

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113-120

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Robinson, Bruce A. & Kruger, Paul January 1, 1988.

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Estimates of thermal drawdown in Hot Dry Rock geothermal systems have been made with two different models of heat transfer from hydraulically fractured reservoir rock blocks to water circulated through the fracture permeability. One model is based on deconvolution of experimental tracer response curves into a network of flowpaths connected in parallel with heat transfer calculated individually in each flowpath. The second model is based on one-dimensional flow through the rock with a block size distribution described as a group of equivalent-radius spheres for which the heat transfer equations can be solved analytically. The two models were applied to the planned Phase II long-term thermal drawdown experiment at Fenton Hill, NM. The results show good agreement between the two models, with estimates of temperature cooldown from 240ºC to 150ºC in a few years depending on selected operation parameters, but with somewhat differing cooldown curve characteristic shapes. Data from the long-term experiment will be helpful in improving the two models.

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113-120

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  • Proceedings, thirteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 19-21, 1988

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  • Report No.: SGP-TR-113-16
  • Grant Number: AS07-84ID12529
  • Office of Scientific & Technical Information Report Number: 887168
  • Archival Resource Key: ark:/67531/metadc886142

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1988

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  • Sept. 21, 2016, 2:29 a.m.

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  • Jan. 11, 2018, 2:12 p.m.

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Robinson, Bruce A. & Kruger, Paul. A comparison of two heat transfer models for estimating thermal drawdown in Hot Dry Rock reservoirs, article, January 1, 1988; Los Alamos, New Mexico. (digital.library.unt.edu/ark:/67531/metadc886142/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.