地温梯度
水力压裂
地热能
磁导率
各向异性
石油工程
岩土工程
热的
地质学
环境科学
热能
萃取(化学)
地热采暖
机械
热力学
化学
地球物理学
物理
量子力学
生物化学
色谱法
膜
作者
Jianxing Liao,Zhengmeng Hou,Muhammad Haris,Ye Tao,Yachen Xie,Ye Yue
出处
期刊:Geothermics
[Elsevier]
日期:2020-01-01
卷期号:83: 101729-101729
被引量:19
标识
DOI:10.1016/j.geothermics.2019.101729
摘要
Geothermal energy attracts extensive attention for its excellent features like large capacity and lack of dependency on weather conditions. This paper presents a development of numerical model to study the hydraulic fracturing and heat extraction from geothermal reservoir, especially from brittle hot dry rock (HDR) reservoir. In this numerical model, an anisotropic damage model has been introduced based on Thermal-Hydraulic-Mechanical (THM) coupling code THOUGH2MP-FLAC3D and this damage-permeability model has also been integrated to demonstrate the enhancement in permeability of stimulated fracture network. Furthermore, numerical studies on planed Dikili enhanced geothermal system (EGS) were carried out by using newly developed model. As the simulated results show, a roughly circular fracture network is created, wherein simulated reservoir volume and area reaches to 49 million m3 and 1.41 million m2, respectively. The maximum permeability increases from initial permeability of 4 × 10−18 m2 to 7.52 × 10−14 m2 in z-direction. Based on these results, heat extraction calculations are performed for 10-years at different injection rates. The accumulated amount of produced net energy increases with the rising injection rate, while growth rate of the average thermal capacity over 10-year slows down. The production results suggest that an injection rate of 100 L/s can recover approximately 1.00 × 1016 J of thermal energy of over a 10-year period, with an average thermal capacity of 31.75 MWth.
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