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TitleDesign and optimization of deep coaxial borehole heat exchangers for cold sedimentary basins
 
AuthorGascuel, V; Raymond, J; Rivard, CORCID logo; Marcil, J -S; Comeau, F -A
SourceGeothermics vol. 105, 102504, 2022 p. 1-36, https://doi.org/10.1016/j.geothermics.2022.102504
Image
Year2022
Alt SeriesNatural Resources Canada, Contribution Series 20210644
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
Subjectsenvironmental geology; Nature and Environment; Science and Technology; hydrocarbons; gas wells; heat flow; geothermal energy; geothermal temperatures
Illustrationsschematic representations; tables; cross-sections; graphs; plots
ProgramEnergy Geoscience Program Coordination
Released2022 07 08
AbstractHeating performance of deep borehole heat exchangers (DBHEs) is heavily impacted by its design and operating flow rate. Here, various designs of coaxial DBHEs were numerically simulated and compared for 1 year of continuous operation in a cold sedimentary basin using the FEFLOW software. Factors affecting performance, including: (1) depth, (2) repurposing an oil and gas (O&G) well or drilling a larger one, (3) repurposing options, (4) inner pipe material, made of either vacuum insulated tubing (VIT) or high-density polyethylene and (5) grout with different thermal conductivity were evaluated. Where an O&G well is available, the most cost-efficient option is repurposing, with the best performance obtained from the deepest and largest diameter wells. While VIT inner pipes performed better in some designs, their performance did not compensate for their cost.
Summary(Plain Language Summary, not published)
Heating performance of various designs of coaxial deep borehole heat exchangers (DBHE) were numerically simulated in a cold sedimentary basin. Factors affecting performance, including: (1) depth, (2) repurposing an oil and gas (O&G) well or drilling a larger one, (3) repurposing options, (4) inner pipe material, and (5) grout with different thermal conductivity, were evaluated. Where an O&G well is available, the most cost-efficient option is repurposing, with the best performances obtained from the deepest and largest diameter wells. While VIT inner pipes performed better in some designs, their performances did not compensate for their cost.
GEOSCAN ID329595

 
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