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

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Jerome Sfeir, George Moridis, Jean-Louis Briaud
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引用次数: 0

摘要

本研究调查了 H2O 和 sCO2 作为地热工作流体(GWFs)在液体为主的强化地热系统(EGSs)中的相对性能。这类系统依靠注入地热工作流体(GWFs)来维持地热能的回收,而地热能的回收主要是通过水力裂缝中岩石与地热工作流体之间的传导热交换来实现的。目前,H2O 是 EGS 作业中唯一考虑使用的 GWF,但超临界 CO2 因其密度和粘度较低而被提议作为一种潜在的 GWF,这导致了潜在的大量热能回收的假设。不过,由于 H2O 的热导率明显更高,因此似乎具有初步优势。我们比较了 H2O 和 SCO2 作为 GWF 在 EGS 的三维模版(最小可重复元素)中的性能,该模版涉及连接注入井和生产井的水力裂缝、提供热源的 EGS 岩石主体,以及与岩石主体足够远的边界,以便在 30 年的 EGS 运行期间保持恒定的压力和温度条件、在我们的研究中,我们考虑了储层初始温度的变化、注入方法的变化(恒定速率和恒定井底压力)以及储层渗透率的变化,目的是 (a) 不仅比较 H2O 和 sCO2 作为 GWF 的 EGS 性能,而且 (b) 确定在什么条件下(如果有的话)sCO2 比 H2O 更有效。研究结果表明,在研究涵盖的所有条件下,H2O 作为 GWF 都具有压倒性的优势,尽管 sCO2 的 GWF 注入率和生产率一直较高,但 H2O 产生的流体温度始终比 sCO2 高得多,能量回收率也始终比 sCO2 高得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Analysis of Comparative Thermo-Hydraulic Performance of sCO2 and H2O as Heat-Exchange Fluids in Enhanced Geothermal Systems

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.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
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).
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