Section mill for wells

Details Section mill for wells Section mill for wells

2005-07-26

2005-07-26

Bagnell, David (Department: 3672)

Wells

Means for perforating, weakening, bending or separating pipe...

Cutter rotates circumferentially of pipe

C166S055200, C166S055700, C175S269000, C175S286000, C175S289000

Reexamination Certificate

active

06920923

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.

REFERENCES:
patent: 2735485 (1956-02-01), Metcalf
patent: 2899000 (1959-08-01), Medders et al.
patent: 5074355 (1991-12-01), Lennon

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