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- W2238156569 abstract "Numerical simulation is used to evaluate mass flow and heat extraction rates from enhanced geothermal injection-production systems that are operated using either CO2 or water as heat transmission fluid. For a model system patterned after the European hot dry rock experiment at Soultz, we find significantly greater heat extraction rates for CO2 as compared to water. The strong dependence of CO2 mobility (= density/viscosity) upon temperature and pressure may lead to unusual production behavior, where heat extraction rates can actually increase for a time, even as the reservoir is subject to thermal depletion. We present the first-ever three-dimensional simulations of CO2 injection-production systems. These show strong effects of gravity on mass flow and heat extraction, due to the large contrast of CO2 density between cold injection and hot production conditions. The tendency for preferential flow of cold, dense CO2 along the reservoir bottom can lead to premature thermal breakthrough. The problem can be avoided by producing from only a limited depth interval at the top of the reservoir." @default.
- W2238156569 created "2016-06-24" @default.
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- W2238156569 date "2008-06-16" @default.
- W2238156569 modified "2023-09-28" @default.
- W2238156569 title "On the production behavior of enhanced geothermal systems with CO2 as working fluid" @default.
- W2238156569 hasPublicationYear "2008" @default.
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