Numerical evaluation of hot dry rock reservoir through stimulation and heat extraction using a three-dimensional anisotropic coupled THM model

Liao Jianxing; Hou Zhengmeng; Haris Muhammad; Tao Ye; Xie Yachen; Yue Ye

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Numerical evaluation of hot dry rock reservoir through stimulation and heat extraction using a three-dimensional anisotropic coupled THM model

机译：三维各向异性耦合THM模型通过激励和热萃取对干热岩储层进行数值评估

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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-HydraulicMechanical (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 m(3) and 1.41 million m(2), respectively. The maximum permeability increases from initial permeability of 4 x 10(-18) m(2) to 7.52 x 10(-14) m(2) 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 x 10(16) J of thermal energy of over a 10-year period, with an average thermal capacity of 31.75 MWth.

机译：地热能因其出色的功能（例如容量大且不依赖天气条件）而受到广泛关注。本文提出了一种数值模型的开发方法，以研究地热储层，特别是脆性干热岩（HDR）储层的水力压裂和热量提取。在该数值模型中，基于热-液压机械（THM）耦合代码THOUGH2MP-FLAC3D引入了各向异性损伤模型，并且该损伤-渗透率模型也已集成，以证明受压裂缝网络渗透率的提高。此外，使用新开发的模型对计划的Dikili增强地热系统（EGS）进行了数值研究。如模拟结果所示，创建了一个大致圆形的裂缝网络，其中模拟的储层体积和面积分别达到了49百万m（3）和141万m（2）。最大磁导率在z方向上从4 x 10（-18）m（2）的初始磁导率增加到7.52 x 10（-14）m（2）。基于这些结果，在不同的注入速率下进行了10年的热量提取计算。随着注入率的增加，生产的净能源的累积量增加，而10年以上的平均热容量的增长速度则放慢。生产结果表明，注入速率为100 L / s的情况下，在10年的时间内可以回收大约1.00 x 10（16）J的热能，平均热容量为31.75 MWth。

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来源
《Geothermics》 |2020年第1期|101729.1-101729.15|共15页
作者
Liao Jianxing; Hou Zhengmeng; Haris Muhammad; Tao Ye; Xie Yachen; Yue Ye;
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作者单位

Tech Univ Clausthal Inst Petr Engn D-38678 Clausthal Zellerfeld Germany;

Tech Univ Clausthal Inst Petr Engn D-38678 Clausthal Zellerfeld Germany|Univ Engn & Technol Lahore Dept Petr & Gas Engn Lahore Pakistan;

Tech Univ Clausthal Inst Petr Engn D-38678 Clausthal Zellerfeld Germany|Sichuan Univ Coll Mfg Sci & Engn Chengdu 610065 Sichuan Peoples R China;

Michigan State Univ Ctr Global Change & Earth Observat E Lansing MI 48823 USA;

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正文语种 eng
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关键词
HDR; Hydraulic fracturing; Heat extraction; THM; THOUGH2MP-FLAC3D; Numerical model;

机译：HDR;水力压裂;热量提取;THM;THOUGH2MP-FLAC3D;数值模型;

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1. The Hijiori Hot Dry Rock test site, Japan Evaluation and optimization of heat extraction from a two-layered reservoir [J] . Norio Tenma, Tsutomu Yamaguchi, George Zyvoloski Geothermics . 2008,第1期

机译：日本Hijiori干岩试验场，评估和优化两层油藏的热量提取
2. Coupled THM and Matrix Stability Modeling of Hydroshearing Stimulation in a Coupled Fracture-Matrix Hot Volcanic System [J] . Xiao Yong, Guo Jianchun, Wang Hehua, Mathematical Problems in Engineering . 2018,第PTa8期

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3. Coupled THM and Matrix Stability Modeling of Hydroshearing Stimulation in a Coupled Fracture-Matrix Hot Volcanic System [J] . Yong Xiao, Jianchun Guo, Hehua Wang, Mathematical Problems in Engineering: Theory, Methods and Applications . 2018,第a期

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4. SENSITIVITY ANALYSIS OF THERMO-HYDRO-MECHANICAL (THM) COUPLED PROCESSES IN A HOT-DRY-ROCK RESERVOIR [C] . Norihiro Watanabe, Christopher I. McDermott, Wenqing Wang, Workshop on Geothermal Reservoir Engineering . 2009

机译：热干岩储层热水机械（THM）耦合工艺的敏感性分析
5. Constitutive modeling of rocks and numerical simulation of oil reservoirs exhibiting pore collapse. [D] . Abdulraheem, Abdulazeez. 1994

机译：岩石的本构模型和表现出孔隙塌陷的油藏的数值模拟。
6. Stimulation Modeling on Three-Dimensional Anisotropic Diffusion of MRI Tracer in the Brain Interstitial Space [O] . Wei Wang, Qingyuan He, Jin Hou, 2019

机译：脑间质空间中MRI示踪剂的三维各向异性扩散的刺激模型
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

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Numerical evaluation of hot dry rock reservoir through stimulation and heat extraction using a three-dimensional anisotropic coupled THM model

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