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储层特征对水平井多裂隙增强型地热系统采热过程影响的数值模拟研究

刘恒伟 肖鹏 窦斌 田红 郑君

刘恒伟, 肖鹏, 窦斌, 田红, 郑君. 储层特征对水平井多裂隙增强型地热系统采热过程影响的数值模拟研究[J]. 地质科技通报, 2022, 41(3): 341-348. doi: 10.19509/j.cnki.dzkq.2022.0081
引用本文: 刘恒伟, 肖鹏, 窦斌, 田红, 郑君. 储层特征对水平井多裂隙增强型地热系统采热过程影响的数值模拟研究[J]. 地质科技通报, 2022, 41(3): 341-348. doi: 10.19509/j.cnki.dzkq.2022.0081
Liu Hengwei, Xiao Peng, Dou Bin, Tian Hong, Zheng Jun. Numerical simulation of influence of reservoir characteristics on heating process of enhanced geothermal system of horizontal well multi fractures[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 341-348. doi: 10.19509/j.cnki.dzkq.2022.0081
Citation: Liu Hengwei, Xiao Peng, Dou Bin, Tian Hong, Zheng Jun. Numerical simulation of influence of reservoir characteristics on heating process of enhanced geothermal system of horizontal well multi fractures[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 341-348. doi: 10.19509/j.cnki.dzkq.2022.0081

储层特征对水平井多裂隙增强型地热系统采热过程影响的数值模拟研究

doi: 10.19509/j.cnki.dzkq.2022.0081
基金项目: 

国家重点研发计划 2019YFB1504204

详细信息
    作者简介:

    刘恒伟(1992—), 男, 现正攻读地质工程专业博士学位, 主要从事岩土工程勘察工作。E-mail: 1937356874@qq.com

    通讯作者:

    郑君(1987—), 女, 副教授, 主要从事地热能开发利用以及钻进自动化方面的研究及教学工作。E-mail: junzheng@cug.edu.cn

  • 中图分类号: P314

Numerical simulation of influence of reservoir characteristics on heating process of enhanced geothermal system of horizontal well multi fractures

  • 摘要:

    将石油天然气行业发展很成熟的水平井多裂隙开发技术用于增强型地热系统(EGS)可显著提高EGS的经济效益。本研究建立了三维EGS水平井多裂隙物理模型, 采用CFX模拟分析了在井间距以及裂隙间距等不同储层特征条件下EGS的运行性能, 揭示了不同储层特征对于EGS储层采热过程的影响机理。研究结果表明: ①裂隙间距是影响EGS工程运行寿命和开采率的关键因素, 在相同注水流量下, 较大的裂隙间距不易形成热穿透, 系统运行寿命更长, 但降低了储层开采率; 过小的裂隙间距易形成热穿透, 系统运行寿命短, 但开采率高。②井间距对裂隙中的流体流速影响显著, 随着井间距增加, 在相同开采时间下, 产流流体的温度不断升高, 系统的寿命也会随着井间距的增加而增加, 井间距的增大也意味着储层的体积也就更大, 从而有更多的热量可供开采, 因而提高了系统的运行寿命。研究结果可以为EGS储层的建造提供理论指导, 为实现商业化开采地热能做好理论准备。

     

  • 图 1  概念模型

    Figure 1.  Conceptual model

    图 2  算例1,2与竖井模式下解析解TD随时间的变化

    Figure 2.  Evolution of TD for cases 1, 2 and analytical solution under vertical well mode

    图 3  不同裂隙间距情况下截止温度为423.15 K时热储层等温度体积图(333.15~423.15 K)

    Figure 3.  Isothermal (333.15-423.15 K) volume of thermal reservoir under different fracture spacing for the cut-off temperature is 423.15 K

    图 4  不同裂隙间距产流温度随时间的变化曲线

    Figure 4.  Evolution of production temperature for different fracture spacing

    图 5  产流截止温度为393.15 K时不同裂隙间距对储层开采率的影响

    Figure 5.  Influence of different fracture spacing on reservoir production rate when the cut-off temperature of production temperature is 393.15 K

    图 6  算例1,3,4在寿命期内EGS发电功率的变化情况

    Figure 6.  Evolution of power generation of EGS during the life of the case 1, 3, 4

    图 7  算例4,5,6设置下裂隙中z=0处剖面(x-y平面)的速度分布

    Figure 7.  Velocity distribution of the z=0 cross section (x-y plane) in the fracture of cases 4, 5, 6

    图 8  不同井间距(裂隙尺寸)下产流温度随时间的变化

    Figure 8.  Variation in the production temperature with time under different well spacings (fracture sizes)

    表  1  流体与岩石的物理参数

    Table  1.   Physical properties of fluid and rock

    参数 名称 数值
    ρs 岩石密度/(kg·m-3) 2 650
    λs 岩石热导率/(W·m-1·K-1) 3.49
    Cs 岩石比热容/(J·kg-1·K-1) 920
    ρf 水的密度/(kg·m-3) 900
    λf 水的热导率/(W·m-1·K-1) 0.606 9
    Cf 水的比热容/(J·kg-1·K-1) 4 181.7
    μ 高温下水的动力黏度/(mPa·s) 0.3
    k 裂隙渗透率/m2 3×10-9
    γ 裂隙孔隙度 1
    W 裂隙开度/m 0.002
    a 代表性的粗糙高度/m 0.014
    L1 裂隙高度/m 400
    L2 裂隙长度/m 400
    Tinj 注水温度/K 333.15
    D 岩体单元厚度/m 100
    下载: 导出CSV

    表  2  算例设置

    Table  2.   Design of cases

    算例 储层温度分布:平均温度473.15 K 流量q/(kg·s-1) 裂隙间距/m 井间距/m
    上表面温度/K 下表面温度/K 温度梯度/(K·100 m-1)
    1 461.15 485.15 6 8 100 495.0
    2 473.15 473.15 8 100 495.0
    3 461.15 485.15 6 8 80 495.0
    4 461.15 485.15 6 8 50 495.0
    5 461.15 485.15 6 8 50 636.4
    6 461.15 485.15 6 8 50 777.8
    下载: 导出CSV
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