• 地质工程与环境工程 •

### 工质变物性对EGS热开采过程影响的数值模拟

1. 中国科学院可再生能源重点实验室/中国科学院广州能源研究所先进能源系统实验室, 广州 510640
• 收稿日期:2014-10-29 发布日期:2015-07-26
• 作者简介:曹文炅(1983),男,助理研究员,博士,主要从事多孔介质传热传质及增强型地热系统数值模拟方面的研究,E-mail:caowj@ms.giec.ac.cn.
• 基金资助:

国家"863"计划项目(2012AA052802)

### Effects of Variable Properties of Heat Transmission Fluid on EGS Heat Extraction: A Numerical Study

Cao Wenjiong, Chen Jiliang, Jiang Fangming

1. Laboratory of Advanced Energy System, CAS/ Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, CAS, Guangzhou 510640, China
• Received:2014-10-29 Published:2015-07-26

Abstract:

The large changes to the temperature and pressure associated with EGS heat exploitation will lead to pronounced changes to the thermo-physical properties of the heat transmission fluid, which will in turn affect the fluid flow and heat transportation inside the EGS subsurface system. It is necessary to establish a variable thermo-physical property EGS model to simulate the EGS heat extraction process and to predict the performance of EGS including its lifetime and capacity. The present work is extended to a previously developed three dimensional EGS heat extraction model with considering the local thermal non-equilibrium between the rock matrix and fluid flowing in the fractures in the porous reservoir, by introducing a module modeling with the property variation of water and supercritical carbon dioxide (SCCO2). The model with fully coupled thermal and hydraulic actions is used to investigate the impacts of thermo-physical properties on the water-EGS heat extraction. It is found that the lifetime of the EGS is 9.0 a under the density effects and 7.5 a under the specific heat capacity effects, indicating that the larger the density and the specific heat capacity of the working fluid possessed are, the shorter the EGS's lifetime is. Under the viscosity effects, the lifetime of the EGS extends to 18.0 a, meaning that the larger the viscosity of the working fluid is, the longer the EGS can be operated. However, the thermal conductivity of working fluid hardly has any effect on the EGS performance. Specially, we compare the heat extraction performance of water-EGS and SCCO2-EGS. Under a fixed injection pressure, the lifetime of water-EGS is longer than that of SCCO2-EGS; but the extraction ratio of the former is lower than the latter at the same time instant mainly due to the much higher mass flow rate of the latter in the EGS operation.

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