Rules Of Thumb For Bit Selection

  • Shale has a better drilling response to RPM.
  • Limestone has a better drilling response to bit weight.
  • Bits with roller bearings can be run at a higher RPM than bits with journal bearings.
  • Bits with sealed bearings can give longer life than bits with open bearings,
  • Milled tooth bits with journal bearings can be run at higher weights than milled tooth bits with roller bearings.
  • Diamond product bits can run at higher RPM than three cone bits.
  • Bits with high offset may wear more on gauge.
  • Bits with high offset may cause more hole deviation.
  • Cost-per-foot analysis can help you decide which bit to use.
  • Examination of dulls can also help you decide which bit to use.

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