{"title":"强化地热系统中作为热交换流体的 sCO2 和 H2O 的热工水力性能对比分析","authors":"Jerome Sfeir, George Moridis, Jean-Louis Briaud","doi":"10.1007/s11242-024-02128-2","DOIUrl":null,"url":null,"abstract":"<p>The relative performance of H<sub>2</sub>O and sCO<sub>2</sub> as geothermal working fluids (GWFs) in liquid-dominated enhanced geothermal systems (EGSs) was investigated in this study. Such systems rely on the injection of GWFs (geothermal working fluids) to sustain geothermal energy recovery, which is dominated by conduction-based heat exchange from the rock to the GWF in the hydraulic fracture. H<sub>2</sub>O is currently the only GWF considered for EGS operations, but supercritical CO<sub>2</sub> has been proposed as a potential GWF because of its lower density and viscosity, which lead to the hypothesis of potentially significant thermal energy recovery. However, H<sub>2</sub>O appears to have an initial advantage because of its significantly higher thermal conductivity. We compared the performance of H<sub>2</sub>O and SCO<sub>2</sub> as GWFs in a 3D stencil (minimum repeatable element) of an EGS involving a hydraulic fracture connecting the injection and the production wells, the main body of the EGS rock that provides the heat source, and boundaries that are sufficiently distant from the main body of the main body of the rock to maintain constant pressure and temperature conditions over a 30-year period of EGS operations In our studies we considered variations in the initial reservoir temperature, in the injection method (at a constant-rate and at a constant bottomhole pressure) and in the reservoir permeability, in an effort (a) not only to compare the EGS performance of H<sub>2</sub>O and sCO<sub>2</sub> as GWFs but also (b) to determine the conditions (if any) under which sCO<sub>2</sub> can be more effective than H<sub>2</sub>O. The results of the study indicated the overwhelming superiority of H<sub>2</sub>O as a GWF under any and all of the conditions covered by the study, producing fluids at dependably much higher temperatures and yielding invariably drastically higher energy recovery than sCO<sub>2</sub> despite the consistently higher GWF injection and production rates attained with sCO<sub>2</sub>.</p>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Analysis of Comparative Thermo-Hydraulic Performance of sCO2 and H2O as Heat-Exchange Fluids in Enhanced Geothermal Systems\",\"authors\":\"Jerome Sfeir, George Moridis, Jean-Louis Briaud\",\"doi\":\"10.1007/s11242-024-02128-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The relative performance of H<sub>2</sub>O and sCO<sub>2</sub> as geothermal working fluids (GWFs) in liquid-dominated enhanced geothermal systems (EGSs) was investigated in this study. Such systems rely on the injection of GWFs (geothermal working fluids) to sustain geothermal energy recovery, which is dominated by conduction-based heat exchange from the rock to the GWF in the hydraulic fracture. H<sub>2</sub>O is currently the only GWF considered for EGS operations, but supercritical CO<sub>2</sub> has been proposed as a potential GWF because of its lower density and viscosity, which lead to the hypothesis of potentially significant thermal energy recovery. However, H<sub>2</sub>O appears to have an initial advantage because of its significantly higher thermal conductivity. We compared the performance of H<sub>2</sub>O and SCO<sub>2</sub> as GWFs in a 3D stencil (minimum repeatable element) of an EGS involving a hydraulic fracture connecting the injection and the production wells, the main body of the EGS rock that provides the heat source, and boundaries that are sufficiently distant from the main body of the main body of the rock to maintain constant pressure and temperature conditions over a 30-year period of EGS operations In our studies we considered variations in the initial reservoir temperature, in the injection method (at a constant-rate and at a constant bottomhole pressure) and in the reservoir permeability, in an effort (a) not only to compare the EGS performance of H<sub>2</sub>O and sCO<sub>2</sub> as GWFs but also (b) to determine the conditions (if any) under which sCO<sub>2</sub> can be more effective than H<sub>2</sub>O. The results of the study indicated the overwhelming superiority of H<sub>2</sub>O as a GWF under any and all of the conditions covered by the study, producing fluids at dependably much higher temperatures and yielding invariably drastically higher energy recovery than sCO<sub>2</sub> despite the consistently higher GWF injection and production rates attained with sCO<sub>2</sub>.</p>\",\"PeriodicalId\":804,\"journal\":{\"name\":\"Transport in Porous Media\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-09-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Transport in Porous Media\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1007/s11242-024-02128-2\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transport in Porous Media","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s11242-024-02128-2","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Analysis of Comparative Thermo-Hydraulic Performance of sCO2 and H2O as Heat-Exchange Fluids in Enhanced Geothermal Systems
The relative performance of H2O and sCO2 as geothermal working fluids (GWFs) in liquid-dominated enhanced geothermal systems (EGSs) was investigated in this study. Such systems rely on the injection of GWFs (geothermal working fluids) to sustain geothermal energy recovery, which is dominated by conduction-based heat exchange from the rock to the GWF in the hydraulic fracture. H2O is currently the only GWF considered for EGS operations, but supercritical CO2 has been proposed as a potential GWF because of its lower density and viscosity, which lead to the hypothesis of potentially significant thermal energy recovery. However, H2O appears to have an initial advantage because of its significantly higher thermal conductivity. We compared the performance of H2O and SCO2 as GWFs in a 3D stencil (minimum repeatable element) of an EGS involving a hydraulic fracture connecting the injection and the production wells, the main body of the EGS rock that provides the heat source, and boundaries that are sufficiently distant from the main body of the main body of the rock to maintain constant pressure and temperature conditions over a 30-year period of EGS operations In our studies we considered variations in the initial reservoir temperature, in the injection method (at a constant-rate and at a constant bottomhole pressure) and in the reservoir permeability, in an effort (a) not only to compare the EGS performance of H2O and sCO2 as GWFs but also (b) to determine the conditions (if any) under which sCO2 can be more effective than H2O. The results of the study indicated the overwhelming superiority of H2O as a GWF under any and all of the conditions covered by the study, producing fluids at dependably much higher temperatures and yielding invariably drastically higher energy recovery than sCO2 despite the consistently higher GWF injection and production rates attained with sCO2.
期刊介绍:
-Publishes original research on physical, chemical, and biological aspects of transport in porous media-
Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)-
Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications-
Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes-
Expanded in 2007 from 12 to 15 issues per year.
Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).