Application of Water Well Drilling Rigs in Hydrogeological Parameter Measurement

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A water well drilling rig enables drilling and tests, vital for measuring hydrogeological parameters. These include permeability and storativity.

 

  1. Measuring permeability coefficient: Use drill holes for pumping tests. Calculate via water yield at different drawdowns. A sand aquifer yielded 20m³/h at 5m drawdown, giving 8m/d permeability—strong water conduction.
  2. Determining specific yield: Monitor dewatering in unconfined aquifers via observation holes. A silty clay aquifer dropped 2m, releasing 300m³. Specific yield of 0.15 showed moderate water release.
  3. Testing transmissivity and storativity: Confined aquifers need stable or transient pumping tests. A sandstone aquifer gave 500m²/d transmissivity and 1×10⁻⁴ storativity—good for large-scale development. Shallow holes test vadose zone permeability, aiding recharge assessment.

Drill holes act as “test sites.” Core data (例如, porosity) verifies parameters. A water well drilling rig ensures accurate measurements, supporting groundwater evaluation.