Watermelon mills FA type
Watermelon mills FA type
The Watermelon Mill is used to gauge “window” in casing string in order to provide rock-destruction tool passability having diameter not exceeding the nominal diameter of the Mill.

The Watermelon Mill may be used:

  • independently on tool with washover through openings in box (pin)
  • in conjunction with second Watermelon Mill and Window Mill with washover through circulating openings of the Window Mill
  • in conjunction with rock-destruction tool with washover through circulating openings of rock-destruction tool
  • in conjunction with Starting-Window Mill to cut and gauge “window” in one trip.
Technical characteristics
Code Nominal diameter of the casing, in. Casing diameter D, in. Length, in. Equivalent to API 7 (USA)
FA-112 5,51 4,41 50,4 2 7/8 Reg
FA-114 5,51 4,49 50,4 2 7/8 Reg
FA-116 5,51 4,57 50,4 2 7/8 Reg
FA-118 5,51 4,65 50,4 2 7/8 Reg
FA-120 5,51 4,72 50,4 2 7/8 Reg
FA-124 5,75 4,88 50,4 2 7/8 Reg
FA-136 6,61 5,35 50,4 NC-31
FA-142 6,61 5,59 50,4 NC-31
FA-151 7,01 5,94 50,4 NC-31
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