Mud Rotary & Air Rotary Drilling

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Mud Rotary for collecting the least disturbed/highest quality in-situ test

The mud rotary drilling method is a gentle and mud-balanced drilling technique to collect the best quality sample or least disturbed / highest quality in-situ test (SPT, thin-walled-tube, Vane Shear, PMT, etc.).

  • High-quality undisturbed sampling (hydraulic or mechanical fixed piston thin-walled tube samples)
  • High-quality SPT testing, with a calibrated SPT hammer (SPT energy testing)
  • High-quality in-situ testing (EVST, PMT, DMT, other)
  • Representative samples at discrete elevations
  • Performed on its own, or through Air Rotary or Sonic Drilling or Auger Drilling cased holes
  • On or off-shore applications

Air Rotary for consolidated formations with a high risk of caving

The equipment used in air rotary drilling is adapted from the air-operated down-the-hole hammer.

Cuttings blow up through the drive sub and casing annulus to a swivel, which conducts them to a sample collector or onto the ground.

  • No need for drilling mud
  • Rapid removal of cuttings
  • Simple groundwater and soil sampling during drilling
  • Ability to measure yield estimates at a selected depth in the formation
  • High rates of penetration, especially in resistant rock formations such as basalt

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