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US 5,626,189 AGranted
Wellbore milling tools and inserts
AssigneeWeatherford U.S., Inc.
InventorChristopher P. Hutchinson
Life of this patent
Estimating the term…
Abstract
A cutting insert for wellbore milling operations is disclosed which, in certain embodiments, has two or more top milling surfaces on an insert body with the surfaces at different heights above a bottom of the insert body. In certain embodiments three top surfaces are used stair-stepped, with a central lower surface, or with a central higher surface. In one aspect all cutting surfaces have an array of chipbreaking indentations. Tools and methods are disclosed which use such inserts.
Claims6
A cutting insert for a tool for wellbore milling operations, the cutting insert comprising
- a body having a top, a bottom, and a rectangular base, and
- a plurality of cutting surfaces on the top of the body, at least one of the cutting surfaces at a different height above the base than the other cutting surfaces, each cutting surface defined by linear boundaries extending from a first edge of the cutting insert to a second edge of the cutting insert, and the linear boundaries parallel to each other,
- the plurality of cutting surfaces comprising three cutting surfaces including a first side cutting surface, a second middle cutting surface, and a third side cutting surface with the second middle cutting surface disposed between the first side cutting surface and the third side cutting surface,
- the second middle cutting surface is at a height above the rectangular base which is greater than a height above the rectangular base of the first side cutting surface, and
- the second middle cutting surface is at a height above the rectangular base greater than a height above the rectangular base of the third side cutting surface.
2 more elements
A cutting insert for a tool for wellbore milling operations, the cutting insert comprising
- a body having a top, a bottom, and a rectangular base, and
- a plurality of cutting surfaces on the top of the body, at least one of the cutting surfaces at a different height above the base than the other cutting surfaces, each cutting surface defined by linear boundaries extending from a first edge of the cutting insert to a second edge of the cutting insert, and the linear boundaries parallel to each other,
- the plurality of cutting surfaces comprising three cutting surfaces including a first side cutting surface, a second middle cutting surface, and a third side cutting surface with the second middle cutting surface disposed between the first side cutting surface and the third side cutting surface,
- the second middle cutting surface is at a height above the rectangular base which is less than a height above the rectangular base of the first side cutting surface, and
- the second middle cutting surface is at a height above the rectangular base less than a height above the rectangular base of the third side cutting surface.
2 more elements
A cutting insert for a tool for wellbore milling operations, the cutting insert comprising
- a body having a top, a bottom, and a rectangular base,
- a plurality of cutting surfaces on the body, at least one of the cutting surfaces at a different height above the base than the other cutting surfaces, each cutting surface defined by linear boundaries extending from a first edge of the cutting insert to a second edge of the cutting insert, and the linear boundaries parallel to each other,
- a plurality of chipbreaking indentations on each cutting surface, and
- each chipbreaking indentation having an oval shape as viewed from above.
1 more element
A cutting insert for a tool for wellbore milling operations, the cutting insert comprising
- a body with a top and a bottom and a rectangular base,
- a plurality of cutting surfaces on the top of the body, at least one of the cutting surfaces at a different height above the top of the rectangular base than the other cutting surfaces, each cutting surface defined by linear boundaries extending from a first edge of the cutting insert to a second edge of the cutting insert, and the linear boundaries parallel to each other,
- a plurality of chipbreaking indentations on each cutting surface,
- wherein the plurality of cutting surfaces is three cutting surfaces including a first side cutting surface, a second middle cutting surface, and a third side cutting surface with the second middle cutting surface disposed between the first side cutting surface and the third side cutting surface,
- wherein the second middle cutting surface is at a first height above the rectangular base which is different than a second height above the rectangular base of the first side cutting surface,
- a difference in the first height and the second height ranging between about 0.03" and about 0.09",
- at least one of the cutting surfaces in a first plane at an angle to a second plane in which another of the cutting surfaces is disposed, and
- the plurality of chipbreaking indentations is a patterned array of rows and columns of indentations covering the entire cutting surfaces.
5 more elements
Dependencies are inferred from the claim text.