Milling Tools | Schlumberger

Milling Tools

Clean out restrictions with tools for light to heavy milling

Conductor taper mill

To clean out restrictions in platform or jackup conductor casing, conductor taper mills have a box-connection-down design, which is useful for installing a smaller-diameter taper mill, a junk mill, or other pilot assembly. Conductor taper mills can ream out considerable deformation in just one pass, and their heavy tungsten carbide dressing ensures long life and fast cutting. These milling tools are available from 15 to 28 in, with fishing necks of 9 1/2 in.

String taper mills

Ideal for cleaning out damaged casing, liners, or tubing, string taper mills taper from the top and bottom of the mill, allowing reaming operations from both directions. String taper mills can also remove keyseats in open hole. Pin-down and box-up connections permit the mill to be run in a  drill collar string or combined with a smaller pilot assembly to avoid sidetracking when removing obstructions. String taper mills are available from 3 1/2 to 17 1/2 in, with fishing necks from 3 1/8 to 9 1/2 in.

Taper mills

Taper mills are designed specifically for milling through tight spots in tubulars. Heavy crushed carbide dressing increases on-bottom time, and ground OD and stabilizer pads eliminate the risk of cutting through casing. Taper mills clean out liners, tubing, and other collapsed or deformed tubulars. They can also be run ahead of other milling tools to clean out “bird nests.” Taper mills are available from 3 1/2 to 17 1/2 in, with fishing necks from 3 1/8 to 9 1/2 in.

Tapered mills milling tools.
Conductor taper mill (left), string taper mill (middle), and taper mill (right).
Milling tools.
Bladed junk mill (left), conebuster mill (middle), and cement mill (right).

Bladed junk mills

Bladed junk mills are dressed with high-quality tungsten carbide to ensure optimal performance in all applications. These milling tools are suitable for all types of general junk milling, as well as for removing packers, retainers, and squeeze tools. Bladed junk mills are available from 3 1/2 to 28 in, with fishing necks from 2 7/8 to 11 1/4 in.

Conebuster mills

For heavy milling, such as bit cones, slips, and pieces of downhole tools, conebuster mills have a concave cutting face with a thick cutting structure. This structure ensures efficient milling and long life. Conebuster mills are available from 3 1/2 to 17 1/2 in, with fishing necks from 3 1/8 to 9 1/2 in.

Cement mills

Designed for light milling, cement mills have an open pattern that cuts quickly on tubular fish. This cutting works well for float collar, plugs, bridge plugs, and retainers and does not clog easily with cement or formation. Cement mills are faster and more durable when cutting steel, as compared with a steel-tooth bit, so they are recommended for any operation with steel-tooth-bit alternatives. These milling tools are available from 3 1/2 to 17 1/2 in, with fishing necks from 2 7/8 to 9 1/2 in.

Pilot mills

Pilot mills are suitable for milling sections of tubular junk and can be used as a dress mill for installing casing patches or milling liner hangers and other downhole tools with a throughbore. These milling tools are available from 3 1/4 to 17 in, with fishing necks from 3 1/8 to 8 in.

Millmaster section mills

For economical milling, sidetracking, and single-string pipe cutting, Millmaster section mills have custom-blended carbide inserts for maximum footage and high ROP. The continuous chip breaker design generates steel cuttings that can be easily circulated out of the hole with minimum specialized mud conditioning.

Milling tools.
Pilot mill (left) and Millmaster section mill (right).
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