• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ground water >New Method for Continuous Transmissivity Profiling in Fractured Rock
【24h】

New Method for Continuous Transmissivity Profiling in Fractured Rock

机译：裂隙岩体连续透射分析的新方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new method is presented to search for hydraulically transmissive features in open boreholes in bedrock. A flexible borehole liner made of a watertight, nylon fabric is filled with water to create a constant driving head to evert (reverse of invert) the liner down the hole so that the liner pushes the borehole water out into transmissive fractures or other permeable features. The descent rate is governed by the bulk transmissivity of the remaining permeable features below the liner. Initially, the liner descent rate or velocity is a measure of transmissivity (T) of the entire hole. As the everting liner passes and seals each permeable feature, changes in the liner velocity indicate the position of each feature and an estimate of T using the Thiem equation for steady radial flow. This method has been performed in boreholes with diameters ranging from 96 to 330 mm. Profiling commonly takes a few hours in holes 200- to 300-m long. After arrival of the liner at the bottom of the hole, the liner acts as a seal preventing borehole cross connection between transmissive features at different depths. Liner removal allows the hole to be used for other purposes. The T values determined using this method in a dolostone aquifer were found to be similar to the values from injection tests using conventional straddle packers. This method is not a replacement for straddle-packer hydraulic testing of specific zones where greater accuracy is desired; however, it is effective and efficient for scanning entire holes for transmissive features.
机译：提出了一种寻找基岩裸眼中水力传输特征的新方法。由不透水的尼龙织物制成的柔性井眼衬管注满水，以形成一个恒定的驱动头，使衬管沿孔外翻（反向），从而使衬管将井眼水推压成可穿透的裂缝或其他可渗透特征。下降速率取决于衬里下方其余可渗透特征的整体透射率。最初，衬管下降速率或速度是整个孔的透射率（T）的量度。当外翻衬管通过并密封每个可渗透特征时，衬管速度的变化将指示每个特征的位置，并使用Thiem方程估算T来获得稳定的径向流。该方法是在直径范围为96至330 mm的钻孔中执行的。在200至300 m长的孔中进行仿形通常需要几个小时。在衬管到达孔的底部之后，衬管用作密封件，以防止在不同深度处的透射特征之间的井眼交叉连接。去除衬里可以将该孔用于其他目的。发现在白云石含水层中使用此方法确定的T值类似于使用常规跨式封隔器进行注水测试得到的T值。这种方法不能替代需要更高精度的特定区域的跨装式液压试验。然而，它对于扫描整个孔的透射特征是有效且高效的。

著录项

  • 来源
    《Ground water》 |2014年第3期|352-367|共16页
  • 作者

    Carl E. Keller; John A. Cherry; Beth L. Parker;

  • 作者单位

    Flexible Underground Technologies Limited, Santa FE, NM 87506;

    School of Engineering, University of Guelph, Guelph, ON N1G2W1, Canada;

    School of Engineering, University of Guelph, Guelph, ON N1G2W1, Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号