Role of Fluid Pressure in the Production Behavior of EnhancedGeothermal Systems with CO2 as Working Fluid

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Numerical simulation is used to evaluate mass flow and heatextraction rates from enhanced geothermal injection-production systemsthat are operated using either CO2 or water as heat transmission fluid.For a model system patterned after the European hot dry rock experimentat Soultz, we find significantly greater heat extraction rates for CO2 ascompared to water. The strong dependence of CO2 mobility (=density/viscosity) upon temperature and pressure may lead to unusualproduction behavior, where heat extraction rates can actually increasefor a time, even as the reservoir is subject to thermaldepletion.

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Pruess, Karsten April 13, 2007.

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Numerical simulation is used to evaluate mass flow and heatextraction rates from enhanced geothermal injection-production systemsthat are operated using either CO2 or water as heat transmission fluid.For a model system patterned after the European hot dry rock experimentat Soultz, we find significantly greater heat extraction rates for CO2 ascompared to water. The strong dependence of CO2 mobility (=density/viscosity) upon temperature and pressure may lead to unusualproduction behavior, where heat extraction rates can actually increasefor a time, even as the reservoir is subject to thermaldepletion.

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  • Report No.: LBNL--62611
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/928785 | External Link
  • Office of Scientific & Technical Information Report Number: 928785
  • Archival Resource Key: ark:/67531/metadc897834

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  • April 13, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 8:46 p.m.

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Pruess, Karsten. Role of Fluid Pressure in the Production Behavior of EnhancedGeothermal Systems with CO2 as Working Fluid, report, April 13, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897834/: accessed February 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.