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Slug Tests in Wells Screened Across the Water Table: Some Additional Considerations

机译：在整个地下水位筛选的井中的塞测试：一些其他注意事项

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The majority of slug tests done at sites of shallow groundwater contamination are performed in wells screened across the water table and are affected by mechanisms beyond those considered in the standard slug-test models. These additional mechanisms give rise to a number of practical issues that are yet to be fully resolved; four of these are addressed here. The wells in which slug tests are performed were rarely installed for that purpose, so the well design can result in problematic (small signal to noise ratio) test data. The suitability of a particular well design should thus always be assessed prior to field testing. In slug tests of short duration, it can be difficult to identify which portion of the test represents filter-pack drainage and which represents formation response; application of a mass balance can help confirm that test phases have been correctly identified. A key parameter required for all slug test models is the casing radius. However, in this setting, the effective casing radius (borehole radius corrected for filter-pack porosity), not the nominal well radius, is required; this effective radius is best estimated directly from test data. Finally, although conventional slug-test models do not consider filter-pack drainage, these models will yield reasonable hydraulic conductivity estimates when applied to the formation-response phase of a test from an appropriately developed well.
机译：在地下水污染较浅的地点进行的大多数段塞测试都是在经过地下水位筛选的井中进行的，并且受标准段塞测试模型中未考虑的机制的影响。这些额外的机制引起了许多尚未完全解决的实际问题；其中四个在这里解决。为此，很少安装执行塞状测试的孔，因此，孔设计可能会导致测试数据出现问题（信噪比较小）。因此，应始终在现场测试之前评估特定井设计的适用性。在短时间的段塞测试中，可能很难确定测试的哪一部分代表过滤器滤网排水，哪一部分代表地层响应。质量平衡的应用可以帮助确认已经正确识别了测试阶段。所有弹头测试模型所需的关键参数是套管半径。但是，在这种设置下，需要有效的套管半径（针对滤芯孔隙率校正的井眼半径），而不是标称井径；最好直接根据测试数据估算此有效半径。最后，尽管常规的段塞测试模型没有考虑滤池排水，但是当将这些模型应用于适当开发的测试的地层响应阶段时，它们将产生合理的水力传导率估算值。

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  • 来源
    《Ground water》 |2014年第2期|311-316|共6页
  • 作者

    J.J. Butler Jr.;

  • 作者单位

    Kansas Geological Survey, University of Kansas, Lawrence, KS 66047,Group of Hydrogeology, Universitat Politecnica de Valencia,Valencia, Spain;

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