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US 6,668,945 B2Granted
Method and apparatus for milling a window in a well casing or liner
AssigneeSchlumberger Technology Corporation
InventorHerve Ohmer
Life of this patent
Estimating the term…
Abstract
A method and apparatus for milling a window in a downhole structure, such as a casing or a liner, includes a mandrel that supports milling elements arranged in a predetermined pattern. In one example, the milling elements are arranged in one or more continuous channels each having a generally helical pattern. The milling elements are able to cut the window in the downhole structure substantially continuously to the desired size.
Claims15
A milling tool for milling a window in a liner, comprising:
- a rotatable mandrel having an outer surface;
- and
- a plurality of milling inserts arranged on the outer surface of the rotatable mandrel in a predetermined pattern along a length of the rotatable mandrel,
- each milling insert extending less than a full circumference of the mandrel,
- the milling inserts arranged along a substantial length of the milling tool.
2 more elements
Dependencies are inferred from the claim text.