String Mills


String Mills

WellEnTech String Mills, sometimes referred to as Watermelon mills, are designed to mill through collapsed casing and liners, eliminating key seats and doglegs, and extending whipstock windows. The blades on the mill are tapered top and bottom to allow reaming both up and down. A connection on the bottom allows a stinger to be run below the mill to keep it centred which prevents cutting out of the casing or sidetracking. String mills are often run piggyback with a tapered mill as a pilot.


  • One Piece Body
  • Robust Construction
  • Spiral Blades
  • Large cutting area
  • Wellbore clean out
  • Casing/Liner repair
  • Extending whipstock windows
  • Eliminating key seats and doglegs

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