基于REV的干热岩裂隙渗流传热耦合模拟研究  

Coupled Simulation of Seepage and Heat Transfer in Hot Dry Rock Fractur Based on REV

作　　者：董芋双 王志国[1,2] 薛孟 刘昌宇 王忠华[1] 宋永臣[3] DONG Yushuang;WANG Zhiguo;XUE Meng;LIU Changyu;WANG Zhonghua;SONG Yongchen(School of Civil Engineering,Northeast Petroleum University,Daqing 163318,China;Heilongjiang Province Geothermal Resources Efficient Development and Comprehensive Utilization Collaborative Innovation Center,Daqing163318,China;School of Energy and Power,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]东北石油大学土木建筑工程学院,大庆163318 [2]黑龙江省地热资源高效开发与综合利用协同创新中心,大庆163318 [3]大连理工大学能源与动力学院,大连116024

出　　处：《工程热物理学报》2023年第9期2340-2346,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52206235);黑龙江省科学基金项目(No.LH2022E032)。

摘　　要：在“双碳”目标导向下,能源结构调整力度加大,地热能、太阳能等新能源得到快速发展。干热岩微观结构复杂、裂隙分布多样,精细描述与表征存在一定难度,需要深入研究。本文以表征单元体(REV)方法为基础,提出了基于REV的干热岩节理裂隙粗糙度(JRC)描述方法,建立了裂隙单元体(REV-JRC)渗流传热分析模型。根据前述模型,模拟分析了裂隙单元体渗流场和温度场特性。结果发现,裂隙单元体温度场分布随着裂隙结构变化呈现波动性;加大流体注入速度和升高流体温度,裂隙单元体到达稳态的时间缩短,同时流体注入温度过低会导致单元体平均温度降低。本文所做工作可为干热岩可持续开发利用提供一定支撑。Under the guidance of the"double carbon"goal,the adjustment of energy structure has been strengthened,and new energy sources such as geothermal energy and solar energy have developed rapidly.The microstructure of hot dry rock is complex and the fracture distribution is diverse.It is difficult to describe and characterize it in detail,which needs further study.In this paper,based on the characterization unit volume(REV)method,we propose an method for describing the fracture roughness(JRC)of dry heat rock joints based on REV,and establish a fracture unit body(REV-JRC)seepage and heat transfer analysis model.Based on this model,the seepage and temperature fields of the fracture unit are simulated and analysed.The results show that the temperature field distribution of the fracture unit fuctuates with the change of the fracture structure.Increasing the fuid injection rate and increasing the fuid temperature,the time for the fracture unit to reach the steady state is shortened,while decreasing the fuid injection temperature leads to a decrease in the average temperature of the cell when the fluid temperature decreases.The work done in this paper can provide some support for the sustainable development and utilization of hot dry rock.

关 键 词：干热岩 裂隙单元体 节理粗糙度 渗流传热 数值模拟 

分 类 号：TK529[动力工程及工程热物理—热能工程]