Window-cutting system for downhole tubulars

Details Window-cutting system for downhole tubulars Window-cutting system for downhole tubulars

1997-08-21

1999-03-16

Tsay, Frank S.

Wells

Means for guiding insertable element laterally of well axis

1661176, E21B 708

Patent

active

058818081

ABSTRACT:
A guide lug for a starting or window mill is provided at the upper end of the whipstock. A back-up shoulder is provided to act against any tendencies of the mill to whirl. A taper is provided for use in guiding the mill toward the casing for the cutting of the window. The lug is configured to be worn by a guide for the window mill or starter mill rather than being milled away. As a result of the use of the lug, the upper sections of the whipstock are protected from the mill. In turn, any holes or other projections provided for subsequent retrieval of the whipstock are functional for such a retrieval at the conclusion of the milling process for the window.

REFERENCES:
patent: 5109924 (1992-05-01), Jurgens et al.
patent: 5301760 (1994-04-01), Graham
patent: 5341873 (1994-08-01), Carter et al.
patent: 5566762 (1996-10-01), Braddick et al.
patent: 5595247 (1997-01-01), Braddick
Christensen Catalog, The Whirlbuster from Hughes Christensen, AR Series Anti-Whirl PDC Bits, 1992.

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