Wells – Means for guiding insertable element laterally of well axis
Patent
1995-09-14
1997-10-14
Tsay, Frank
Wells
Means for guiding insertable element laterally of well axis
E21B 708
Patent
active
056762062
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:
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Christensen Catalog, The Whirlbuster from Hughes Christensen, AR Series Anti-Whirl PDC Bits, 1992.
Johnson John J.
Rehbock Hans H.
Baker Hughes Incorporated
Tsay Frank
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