Section mill for wells
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United States of America Patent
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-
Jul 26, 2005
Grant Date -
N/A
app pub date -
Sep 22, 2003
filing date -
Sep 22, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A section mill for casings used in oil wells to cut predetermined portions for repair purposes. An elongated cylindrical assembly is inserted through the casing and it includes at least two spaced apart apertures with one blade member pivotally mounted within each aperture. First and second coaxially disposed tubular shaft assemblies with teethed portions to coact with the blades to selectively move them between two extreme position upon the application of a pressurized fluid. The fluid needs to overcome the spring biased applied to the shaft assemblies. The first set of blades is stopped and slidably rotates in contact with the internal surface of the casing. The second set cuts through the casing with one end and sections the casing with the other end. After wearing off, the first set of blades continues the sectioning work.
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