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Taper Mill

Milling through any restriction

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Drillstar Taper Mills are designed to repair collapsed casings or tubings and to shave off cement or corroded parts in casings.

If a restriction is found in your well architecture, our taper mill hardfacing is designed to clean the casing without cutting it and to penetrate the metal very gradually. The upper part of the taper mill is long enough to allow the addition of stabilizing blades while still remaining easy to fish.

These downhole tools can be hardfaced with your choice of TOPLOY (tungsten carbide grains) or cutting inserts : TOPMILL / SWORDFISH inserts.

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

Top thread
Long type
Short type
Neck OD
3¼” - 3⅞”2⅜"34"30"3"
4” - 4⅜”2⅜"34"30"3⅛"
4½” - 5⅜"2⅞"38"31"3¾"
5½” - 5⅝"3½"42"32"4¼"
5¾” - 6⅜"3½"44"32"4¾"
6½” - 7⅜"3½"46"34"4¾"
7½” - 7⅞"4½"54"36"5¾"
8⅜” - 9½"4½"54"36"5¾"
9⅜” - 9⅞"4½", 6⅝"54"36"5¾", 7¾"
10⅜” - 11"6⅝"57"38"7¾"
11½” - 12¼"6⅝"60"40"7¾"
14¾” - 15"6⅝"70"60"7¾"
17” - 17½"6⅝"70"60"7¾"
20” - 26"6⅝", 7⅝"70"60"7¾", 9½"

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