Well casing window mill

Details Well casing window mill Well casing window mill

E - Fixed Constructions

21

B

166/15, 255/69

E21B 29/02 (2006.01) E21B 7/06 (2006.01) E21B 10/46 (2006.01) E21B 29/06 (2006.01)

Patent

CA 1073808

ABSTRACT OF THE DISCLOSURE 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 he 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.

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