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注入时间和静水压力对孔隙热储层中Cl运移影响

赵丽 黄尚峥 张庆 卢宇灿 金毅 王心义 邢明飞

赵丽,黄尚峥,张庆,等. 注入时间和静水压力对孔隙热储层中Cl−运移影响[J]. 水文地质工程地质,2022,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202206026
引用本文: 赵丽,黄尚峥,张庆,等. 注入时间和静水压力对孔隙热储层中Cl运移影响[J]. 水文地质工程地质,2022,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202206026
ZHAO Li, HUANG Shangzheng, ZHANG Qing, et al. Effect of injection time and hydrostatic pressure on chloride migration in a porous geothermal reservoir[J]. Hydrogeology & Engineering Geology, 2022, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202206026
Citation: ZHAO Li, HUANG Shangzheng, ZHANG Qing, et al. Effect of injection time and hydrostatic pressure on chloride migration in a porous geothermal reservoir[J]. Hydrogeology & Engineering Geology, 2022, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202206026

注入时间和静水压力对孔隙热储层中Cl运移影响

doi: 10.16030/j.cnki.issn.1000-3665.202206026
基金项目: 陕西省煤矿水害防治技术重点实验室开放基金项目(2021SKMS04);2021年度河南省科技攻关计划项目(212102310502;212102310061);2022年度河南省高等学校重点科研项目(22B610002);河南理工大学博士基金(B2022-38)
详细信息
    作者简介:

    赵丽(1977-),女,教授,博士(后),硕士生导师,主要从事地下水污染与防治方向研究。E-mail:zhaoli@hpu.edu.cn

    通讯作者:

    张庆(1976-),男,高级工程师,博士,硕士生导师,主要从事水文地质、工程地质及地热开发利用方向的研究。E-mail:zhangqing@hpu.edu.cn

  • 中图分类号: P314

Effect of injection time and hydrostatic pressure on chloride migration in a porous geothermal reservoir

  • 摘要: 迄今为止,注入时间和静水压力对溶质在深层承压地热水中的运移规律影响研究少有报道。通过模拟35℃的低温地热环境,开展了注入时间1,2,3,4,5 h以及静水压力0,6,9 MPa条件下Cl的运移柱模拟试验。采用CXTFIT 2. 1软件进行数值模拟,探讨了孔隙型热储砂土中Cl的运移规律和影响因素。结果表明:在模拟的低温孔隙型热储层中,不同注入时间和静水压力下,Cl的运移曲线均呈正态对称分布,CDE模型也可较好地表征其穿透曲线,因此溶质扩散过程符合菲克定律。注入时间的不同,会引起Cl的穿透曲线、运移参数发生变化,这与不同注入时间条件下溶质注入总量、柱内溶质浓度差以及分子扩散能力不同有关。在不同静水压力条件下,弥散系数从0 MPa的25.22 cm2/h增加到9 MPa的36.13 cm2/h,分子扩散系数、机械弥散系数以及弥散度也随之增大,因此溶质的弥散作用随静水压力的增大而增强。研究结果对于丰富地下水的溶质运移理论具有重要意义。
  • 图  1  溶质运移模拟装置简图

    Figure  1.  Schematic diagram of solute transport simulator

    图  2  注入时间4,5 h下运移拟合结果对比

    Figure  2.  Comparison of fitting results of migration at injection times of 4 h and 5 h

    图  3  注入时间1,2,3 h下运移拟合结果对比

    Figure  3.  Comparison of fitting results of migration at injection times of 1 h, 2 h and 3 h

    图  4  穿透试验过程模拟柱进口、出口压力变化图

    Figure  4.  Pressure change diagram of inlet and outlet of simulation column during the penetration test

    图  5  静水压力0,6 MPa下运移拟合结果对比

    Figure  5.  Comparison of migration fitting results under hydrostatic pressures of 0 MPa and 6 MPa

    图  6  静水压力6,9 MPa下运移拟合结果对比

    Figure  6.  Comparison of migration fitting results under hydrostatic pressures of 6 MPa and 9 MPa

    表  1  岩样的物理性质

    Table  1.   Physical properties of rock samples

    测定指标数值
    密度/(g·cm−32.52
    吸湿水/%2.78
    含水率/%13.2
    总孔隙度/%26.19
    pH(水土比2.5∶1)8.6~8.9
    下载: 导出CSV

    表  2  不同注入时间Cl-穿透曲线CDE拟合参数值

    Table  2.   CDE fitting parameters of Cl- penetration curve at different injection times

    通入时间
    /h
    q
    /(cm·h−1
    θCDE模型λ=D/V
    /cm
    Dh=D−Df
    /(cm2·h−1
    Pe=VL/DDf=Vd/Pe
    /(cm2·h−1
    D
    /(cm2·h−1
    V
    /(cm· h−1
    R2
    16.240.4510.6812.880.9810.82910.63760.30.043
    211.2812.10.990.93211.23553.6350.045
    325.2215.030.9961.67825.11929.7980.101
    47.22113.310.9970.5427.19192.1620.029
    57.09713.570.9980.5237.06995.6040.028
    注:q——达西流速/(cm·h−1);θ——填充土柱的有效孔隙度;D——砂柱的纵向弥散系数/(cm2·h−1) ;λ——弥散度/cm;Pe——Peclet 数;Df——分子扩散系数/(cm2·h−1);d——填充砂土的平均粒径/cm,取0.2 cm;L——柱子长度/cm,取50 cm;D h——机械弥散系数/(cm2·h−1); R2——拟合结果的相关系数。
    下载: 导出CSV

    表  3  不同静水压力Cl-穿透曲线CDE拟合参数值

    Table  3.   CDE fitting parameters of Cl- penetration curves under different hydrostatic pressures

    静水压力
    /MPa
    q
    /(cm·h−1
    θCDE模型λ=D/V
    /cm
    Dh=D−Df
    /(cm2·h−1
    Pe=VL/DDf=Vd/Pe
    /(cm2·h−1
    D
    /(cm2·h−1
    R2
    0
    6.24

    0.45
    25.220.9961.67825.11929.7980.101
    632.290.9982.31632.16121.5860.129
    936.130.9942.3835.98521.0070.145
    下载: 导出CSV
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  • 收稿日期:  2022-06-15
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