[1]程林松,时俊杰,曹仁义,等.局部非热平衡对增强型地热系统的影响探究[J].深圳大学学报理工版,2022,39(6):649-659.[doi:10.3724/SP.J.1249.2022.06649]
 CHENG Linsong,SHI Junjie,CAO Renyi,et al.Influence of local thermal non-equilibrium on enhanced geothermal system[J].Journal of Shenzhen University Science and Engineering,2022,39(6):649-659.[doi:10.3724/SP.J.1249.2022.06649]
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局部非热平衡对增强型地热系统的影响探究()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第39卷
期数:
2022年第6期
页码:
649-659
栏目:
环境与能源
出版日期:
2022-11-15

文章信息/Info

Title:
Influence of local thermal non-equilibrium on enhanced geothermal system
文章编号:
202206006
作者:
程林松时俊杰曹仁义杨晨旭杜旭林
中国石油大学(北京)石油工程学院,北京102249
Author(s):
CHENG Linsong SHI Junjie CAO Renyi YANG Chenxu DU Xulin
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, P.R.China
关键词:
地热学油气水渗流力学致密储层局部非热平衡嵌入式离散裂缝模型数值模拟致密基质复杂裂缝增强型地热系统
Keywords:
geothermics oil gas and water seepage mechanics tight reservoir local non-thermal equilibrium embedded discrete fracture model numerical simulation tight matrix complex fractures enhanced geothermal system
分类号:
P314;TE312;TE32
DOI:
10.3724/SP.J.1249.2022.06649
文献标志码:
A
摘要:
干热岩的有效开发需要依托增强型地热系统所形成的复杂裂缝网络,而致密基质与不同裂缝之间形成了不同尺度的传质传热环境,导致多孔介质传质传热过程存在复杂性.为分析局部非热平衡对复杂裂缝系统传质传热过程的影响,建立考虑局部非热平衡假设的毫米尺度传质传热模型,揭示局部非热平衡假设对基质-裂缝传质传热过程影响的微观作用机理.同时,建立考虑局部非热平衡假设的嵌入式离散裂缝模型和求解方法,通过储层物性参数敏感性研究分析考虑局部非热平衡假设的必要性.结果表明,不考虑局部非热平衡假设会低估在近裂缝区域的岩石温度,而高估传热前缘区域的流体温度;局部非热平衡对增强型地热系统的影响主要体现在注入早期;而注入强度越高或基质裂缝渗透率越低或基质裂缝孔隙度差异越大、或岩石热扩散系数越大、或对流挨热系数越小,都越需要考虑局部非热平衡假设.研究结果可为增强型地热系统的精确数值模拟提供参考.
Abstract:
Effective development of hot dry rock depends on complex fracture network formed by enhanced geothermal system. Different scales of mass and heat transfer environment are formed between tight matrix and different fractures, which leads to the complexity of mass and heat transfer process in porous media. In order to analyze the influence of local thermal non-equilibrium on the mass and heat transfer process of complex fracture system, a millimeter-scale mass and heat transfer model considering local non-thermal equilibrium is established. The microscopic mechanism of the effect of local non-thermal equilibrium assumption on mass and heat transfer process in matrix-fracture system is revealed. An embedded discrete fracture model considering local thermal non-equilibrium assumption and its solution method are also established. The necessity of considering local thermal non-equilibrium by studying the sensitivity of formation physical parameters. The results show that ignoring the local thermal non-equilibrium assumption will underestimate the rock temperature near the fracture zone and overestimate the fluid temperature in the heat transfer front zone. The effect of local thermal non-equilibrium on the enhanced geothermal system is mainly reflected in the early stage of injection. The higher the injection intensity, the lower the matrix fracture permeability, the greater the matrix fracture porosity difference, the greater the rock thermal diffusion coefficient, the smaller the convective heat transfer coefficient, the more need to consider the heat transfer model based on local thermal non-equilibrium assumption. The results can provide reference for accurate numerical simulation of enhanced geothermal system.
更新日期/Last Update: 2022-11-30