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Related Experiment Videos

A method for evaluating horizontal well pumping tests.

David E Langseth1, Andrew H Smyth, James May

  • 1Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA. dlangseth@gradientcorp.com

Ground Water
|October 2, 2004
PubMed
Summary
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This study introduces a new method to estimate aquifer parameters like transmissivity and storativity for horizontal wells using vertical well pumping test techniques. It simplifies analysis for groundwater resource management.

Area of Science:

  • Hydrogeology
  • Groundwater Hydrology
  • Aquifer Mechanics

Background:

  • Estimating aquifer parameters (transmissivity, storativity) is crucial for predicting horizontal well performance.
  • Existing methods for vertical wells are well-established, but comparable techniques for horizontal wells are lacking in groundwater literature.
  • Petroleum industry methods exist but have limited applicability for groundwater evaluation.

Purpose of the Study:

  • To present a versatile method for applying vertical well pumping test procedures to horizontal wells.
  • To enable accurate estimation of aquifer parameters for horizontal wells.
  • To bridge the gap in hydrogeological methodologies for horizontal well analysis.

Main Methods:

  • Applying the principle of superposition to model a horizontal well as multiple partially penetrating vertical wells.

Related Experiment Videos

  • Calculating an equivalent vertical well distance for a given pumping rate and observation well.
  • Adapting existing vertical well pumping test algorithms and type curves for horizontal well data.
  • Main Results:

    • The proposed method effectively estimates aquifer parameters for horizontal wells in confined aquifers.
    • Good results were achieved for unconfined aquifers when delayed yield response is absent.
    • Delayed yield response in unconfined aquifers was found to increase method error.

    Conclusions:

    • The presented method offers a simple and versatile approach to analyze horizontal well pumping tests.
    • It allows the use of established vertical well analysis techniques, enhancing groundwater assessment.
    • Further research may be needed to refine the method for unconfined aquifers with significant delayed yield.