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    非完整井下单井注抽试验数值模拟方法改进

    顾昊琛 王全荣 詹红兵

    顾昊琛, 王全荣, 詹红兵, 2020. 非完整井下单井注抽试验数值模拟方法改进. 地球科学, 45(2): 685-692. doi: 10.3799/dqkx.2018.366
    引用本文: 顾昊琛, 王全荣, 詹红兵, 2020. 非完整井下单井注抽试验数值模拟方法改进. 地球科学, 45(2): 685-692. doi: 10.3799/dqkx.2018.366
    Gu Haochen, Wang Quanrong, Zhan Hongbin, 2020. An Improved Approach in Modeling Injection-Withdraw Test of the Partially Penetrating Well. Earth Science, 45(2): 685-692. doi: 10.3799/dqkx.2018.366
    Citation: Gu Haochen, Wang Quanrong, Zhan Hongbin, 2020. An Improved Approach in Modeling Injection-Withdraw Test of the Partially Penetrating Well. Earth Science, 45(2): 685-692. doi: 10.3799/dqkx.2018.366

    非完整井下单井注抽试验数值模拟方法改进

    doi: 10.3799/dqkx.2018.366
    基金项目: 

    国家自然科学基金青年基金 41502229

    国家自然科学基金创新群体 41521001

    中央高校基本科研业务费专项资金摇篮计划 CUGL160407

    中国地质调查局项目 DD20190263

    中国地质调查局项目 DD2019040022

    详细信息
      作者简介:

      顾昊琛(1994—), 男, 硕士研究生, 主要从事地下水流动及污染物迁移规律数值模拟研究

      通讯作者:

      王全荣

    • 中图分类号: P641.2

    An Improved Approach in Modeling Injection-Withdraw Test of the Partially Penetrating Well

    • 摘要: 单井注抽试验(SWIW试验)具有成本低、耗时短、易操作等优点,被广泛用于获取野外含水层的弥散度等物理化学参数.然而,井筒附近的流场变化复杂,给模型求解带来不便,尤其是非完整井问题.针对非完整井SWIW试验问题,MODFLOW/MT3DMS软件中包含3种模块:传统WELL模块、高渗透性WELL模块和MNW模块,分别代表 3种常规的数值模拟方法.研究表明现有的这3个模块都存在一些假设条件,野外试验条件可能难以满足.为此,本研究提出一种新的计算方法,即将MNW模块中考虑井中溶质混溶的公式运用到高渗透性WELL模块上,通过一个参数反求案例的分析,证明SWIW试验模拟结果的精度得到提高.基于改进后的模型,探究传统模型中常用的两个假设条件的影响:忽略滤水管空间位置和假设试验过程中流场是稳定.结果表明:(1)非完整井井筒滤水管的位置对浓度结果的影响不可忽略;(2)含水层渗透系数与储水系数的比值较小时,稳定流场这个假设条件会带来误差.

       

    • 图  1  单井注抽试验概念模型示意图(Wang et al., 2017

      a.注入过程;b.抽取过程(初期);B为厚度(m);黑色箭头表示井筒附近水流方向,蓝色箭头表示距离井较远的含水层水流方向,红色深浅表示溶质浓度的高低

      Fig.  1.  The conceptual model of single well injection and extraction test

      图  2  网格系统平面示意图

      Fig.  2.  Grid system in a plan view

      图  3  网格系统三维示意图

      Fig.  3.  Grid system in 3-D view

      图  4  3种模型井筒滤水管里的水位对比

      Fig.  4.  Comparison of water level between three modules in the wellbore

      图  5  3种模型井筒浓度对比图

      a.井筒滤水管顶部;b.井筒滤水管中部

      Fig.  5.  Comparison of concentration between three modules in the wellbore

      图  6  3种模块拟合结果

      Fig.  6.  The fitting results of the three modules

      图  7  滤水管在不同位置下的计算结果对比

      Fig.  7.  Results comparison of the new method under different inlet pipe positions

      图  8  不同K/Ss下的井筒水位图

      Fig.  8.  The water level in wellbore under different K/Ss

      图  9  不同K/Ss下的井筒浓度

      Fig.  9.  The concentration in wellbore under different K/Ss

      表  1  3种模块反求的参数

      Table  1.   Parameters estimated by the three modules

      孔隙度 弥散度(m)
      COMSOL模型 0.3 0.62
      改进后的高渗CW模型 0.3 0.60
      Huang et al.(2010)的解析解 0.5 0.59
      MNW模型 0.3 0.45
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2018-12-09
    • 刊出日期:  2020-02-15

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