Parametric Sensivity Study of Operating and Design Variables in Wellbore Heat Exchangers

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This report documents the results of an extensive sensitivity study conducted by the Idaho National Engineering and Environmental Laboratory. This study investigated the effects of various operating and design parameters on wellbore heat exchanger performance to determine conditions for optimal thermal energy extraction and evaluate the potential for using a wellbore heat exchanger model for power generation. Variables studied included operational parameters such as circulation rates, wellbore geometries and working fluid properties, and regional properties including basal heat flux and formation rock type. Energy extraction is strongly affected by fluid residence time, heat transfer contact area, and formation thermal properties. ... continued below

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Shook, G. Michael; Nalla, Gopi; Mines, Gregory L. & Bloomfield, K. Kit May 1, 2004.

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This report documents the results of an extensive sensitivity study conducted by the Idaho National Engineering and Environmental Laboratory. This study investigated the effects of various operating and design parameters on wellbore heat exchanger performance to determine conditions for optimal thermal energy extraction and evaluate the potential for using a wellbore heat exchanger model for power generation. Variables studied included operational parameters such as circulation rates, wellbore geometries and working fluid properties, and regional properties including basal heat flux and formation rock type. Energy extraction is strongly affected by fluid residence time, heat transfer contact area, and formation thermal properties. Water appears to be the most appropriate working fluid. Aside from minimal tubing insulation, tubing properties are second order effects. On the basis of the sensitivity study, a best case model was simulated and the results compared against existing low-temperature power generation plants. Even assuming ideal work conversion to electric power, a wellbore heat exchange model cannot generate 200 kW (682.4e+3 BTU/h) at the onset of pseudosteady state. Using realistic conversion efficiency, the method is unlikely to generate 50 kW (170.6e+3 BTU/h).

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  • Report No.: INEEL/EXT-03-01433
  • Grant Number: DE-AC07-99ID-13727
  • DOI: 10.2172/910645 | External Link
  • Office of Scientific & Technical Information Report Number: 910645
  • Archival Resource Key: ark:/67531/metadc887671

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 2004

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 15, 2016, 3:12 p.m.

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Shook, G. Michael; Nalla, Gopi; Mines, Gregory L. & Bloomfield, K. Kit. Parametric Sensivity Study of Operating and Design Variables in Wellbore Heat Exchangers, report, May 1, 2004; [Idaho Falls, Idaho]. (digital.library.unt.edu/ark:/67531/metadc887671/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.