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Pilot Mill

Fast and dependable casing milling

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Drillstar Pilot Mill is designed for milling tubular fish, cleaning a casing internal diameter before running a casing patch and suppressing the damaged parts of a casing.

Thanks to the pilot bit located below the blades, DRILLSTAR Pilot Mill can be perfectly directed into the fish head, avoiding side tracking. The pilot is hardfaced for optimum resistance to wear and enables perfect, smooth guiding of the milling blades.

These downhole tools can be hardfaced with your choice of TOPLOY (tungsten carbide grains) or cutting inserts : TOPMILL (square) or SWORDFISH (shaped). Inserts enable better ROP and tool life.

All features (pilot diameter, fishing neck, number of blades, etc.) can be customized to your exact needs.

All mills can be hardfaced using TOPLOY S : excellent behaviour thanks to its matrix specially designed to release worn grains. Inserts enable better ROP and tool life, while TOPLOY backing significantly improves the hardfacing resistance to downhole shocks. Two standard types of inserts are available : TOPMILL square inserts, or SWORDFISH® shaped inserts. Custom inserts are available on request.

Drillstar cutting inserts are made of premium cutting grade tungsten carbide, and can replace TOPLOY on most milling tools. They enable you to mill faster and longer, while reducing the necessary weight on bit.

These large, square-shaped tungsten carbide inserts are widely used today for all milling applications.

These innovative inserts combine the advantages of both square and round-shaped models (exclusivity from Cutting & Wear).

Standard dimensions

Dressed
OD
Top thread
API REG Pin
Pilot ODOveralll
Length
Fishing
Neck
OD
3¼" - 3⅞"2⅜"20"1¾" - 2¾"3"
4" - 4⅜"2⅜"21"1¾" - 2¾"3⅛"
4" - 5⅜"2⅞"23"2" - 3¼"3¾"
5½" - 5⅝"3½"23"2½" - 4¾"4¼"
5¾" - 7⅜"3½"27"2½" - 4¾"4¾"
6" - 9⅞"4½"29"4¾" - 6¾"5¾"
9⅞" - 17½"6⅝"30"7¾" - 15"7¾"
17½" – 20"7⅝"33"7¾" - 15"9½"