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Analytical and Semi-Analytical Tools for the Design of Oscillatory Pumping Tests

机译：振荡泵测试设计的分析和半分析工具

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摘要

Oscillatory pumping testsin which flow is varied in a periodic fashionprovide a method for understanding aquifer heterogeneity that is complementary to strategies such as slug testing and constant-rate pumping tests. During oscillatory testing, pressure data collected at non-pumping wells can be processed to extract metrics, such as signal amplitude and phase lag, from a time series. These metrics are robust against common sensor problems (including drift and noise) and have been shown to provide information about aquifer heterogeneity. Field implementations of oscillatory pumping tests for characterization, however, are not common and thus there are few guidelines for their design and implementation. Here, we use available analytical solutions from the literature to develop design guidelines for oscillatory pumping tests, while considering practical field constraints. We present two key analytical results for design and analysis of oscillatory pumping tests. First, we provide methods for choosing testing frequencies and flow rates which maximize the signal amplitude that can be expected at a distance from an oscillating pumping well, given design constraints such as maximum/minimum oscillator frequency and maximum volume cycled. Preliminary data from field testing helps to validate the methodology. Second, we develop a semi-analytical method for computing the sensitivity of oscillatory signals to spatially distributed aquifer flow parameters. This method can be quickly applied to understand the sensed extent of an aquifer at a given testing frequency. Both results can be applied given only bulk aquifer parameter estimates, and can help to optimize design of oscillatory pumping test campaigns.
机译：流量周期性变化的振荡抽水试验提供了一种理解含水层非均质性的方法，该方法是对段塞试验和恒速抽水试验等策略的补充。在振荡测试期间，可以处理在非抽油机井收集的压力数据，以从时间序列中提取指标，例如信号幅度和相位滞后。这些度量标准对常见的传感器问题（包括漂移和噪声）具有鲁棒性，并已显示出可提供有关含水层非均质性的信息。然而，用于表征的振荡泵浦测试的现场实施并不常见，因此，关于其设计和实施的指导原则很少。在这里，我们使用文献中可用的分析解决方案来开发振荡泵浦测试的设计准则，同时考虑实际的现场约束。我们提供了用于振荡泵浦测试设计和分析的两个关键分析结果。首先，在给定设计限制（例如最大/最小振荡器频率和最大循环体积）的情况下，我们提供了选择测试频率和流速的方法，这些方法可使信号振幅最大化，该振幅可以在距振荡泵井一定距离处获得。现场测试的初步数据有助于验证该方法。其次，我们开发了一种半解析方法，用于计算振荡信号对空间分布的含水层流量参数的敏感性。该方法可以快速应用，以了解在给定测试频率下感测到的含水层范围。仅给出大量含水层参数估计值，即可应用这两种结果，并且可以帮助优化振荡抽水试验方案的设计。

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  • 来源
    《Ground water》 |2015年第6期|896-907|共12页
  • 作者

    Cardiff Michael; Barrash Warren;

  • 作者单位

    Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA;

    Boise State Univ, Dept Geosci, Boise, ID 83725 USA;

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  • 正文语种 eng
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