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Lajme 71 Pamje
Frozen soil poses core challenges to water well drilling rig due to its high ice content and significant freeze-thaw cycles, showing dual-state properties of “hard at low temperatures and soft when thawed”. When drilling into permafrost layers, drill bits face three major issues:

 

  1. Rock-like hardness:
    Frozen soil with ice can have a compressive strength over 100 MPa, causing ordinary alloy bits to chip easily.
  2. Frost heave damage:
    Water expands by 9% when freezing, and the borehole wall may squeeze the drill pipe, leading to stuck pipes.
  3. Thaw settlement risk:
    Heat from the drill thaws local frozen soil, increasing the probability of borehole wall collapse by over 30%.

 

Solutions should focus on three aspects: upgrading drill power (e.g., increasing hydraulic torque by 40%), optimizing bit materials (applying tungsten carbide coatings), and improving mud systems (adding antifreeze agents) to form a systematic solution.water well drilling rig