Well casing window mill

Details Well casing window mill Well casing window mill

1978-08-14

1981-05-12

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175399, 175402, 175385, 175410, 166 553, E21B 1046

Patent

active

042666210

ABSTRACT:
A diamond milling cutter for elongating a laterally opening window in a well casing set in a well bore extending into the earth. The mill has a revolving surface which engages a sidetracking whipstock or the edge of the casing being milled to urge the mill off dead center on the casing edge and enhance the cutting action. One or more eccentric lobes engage the whipstock and cause the mill to revolve on a gyrating or non-fixed axis and effect oscillation of the cutter center laterally of the edge, or a broadly conical nose on the cutting face of the mill provides a wedge action against the casing to laterally move the mill off center and enhance the cutting action.

REFERENCES:
patent: 2217889 (1940-10-01), Carpenter et al.
patent: 2360425 (1944-10-01), Kinzbach
patent: 3367430 (1968-02-01), Rowley
patent: 3583504 (1971-06-01), Aalund
patent: 3861477 (1975-01-01), Lazayres

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