Technical Points of Water Well Drilling Rig in Fracture Water Exploration

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A water well drilling rig needs special techniques to explore fracture water, which is uneven and hard to find.

 

  1. Directional drilling to track fractures: Rock fractures have directions. The rig drills along fracture trends to find water-rich ones. In a granite area, it followed a 30° NE trend. At 120m, it found a 5cm-wide fracture with 20m³/h yield.
  2. Core fracture analysis: Count core fractures—density, orientation, fillings. This judges water conductivity. In sandstone, 80-100m cores had 5 fractures/m, mostly open. Pump tests confirmed this as the main aquifer.
  3. Combining logging and pressure tests: Use hydrogeological logging to spot fracture zones. A low-resistivity segment (water-rich) guided dense coring. It found partially filled but still conductive fractures. For deep fractures, the water well drilling rig does pressure tests. In metamorphic rock, 150-180m had high water absorption, good for extraction.

The water well rig, with geology and geophysics, boosts exploration success for fracture water.