Whipstock and starter mill

Details Whipstock and starter mill Whipstock and starter mill

1996-02-20

1997-07-15

Tsay, Frank

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 557, 175 81, E21B 708

Patent

active

056474369

ABSTRACT:
A mill kick out apparatus comprises a whipstock and a starter mill. The whipstock has a lower end pivotally connected to a supporting assembly, an upper end, an outer side for disposition adjacent one side of a well wall, and an inner side diametrically opposite the outer side. The outer side has a vertically elongate upper portion angularly disposed with respect to a lower portion thereof, whereby the upper portion may abut the one side of the well wall when the lower portion is inclined downwardly and inwardly with respect thereto. The inner side is configured to be disposed at a first downward and inward angle with respect to the one side of the well wall when the one side so abuts the upper portion of the outer side of the whipstock. A lug projects generally radially inwardly from the inner side of the whipstock adjacent the upper end and has a generally radially inwardly facing surface disposed at a second downward and inward angle with respect to the one side of the well wall. The length of a primary portion of the lug surface is no greater than the length of the upper portion of the outer side of the whipstock. The starter mill is longitudinally movable with respect to the whipstock and comprises a rotary milling tool and a nose piece disposed below the milling tool. The nose piece has an upper portion of greater diameter than the distance between a lower part of the lug and another side of the well wall opposite the one side. The milling tool and the nose piece are relatively rotatable.

REFERENCES:
patent: 2145422 (1939-01-01), Kinzbach
patent: 2362529 (1944-11-01), Barrett et al.
patent: 2766010 (1956-10-01), Hester
patent: 4182423 (1980-01-01), Ziebarth et al.
patent: 5035292 (1991-07-01), Bailey et al.
patent: 5383522 (1995-01-01), Hailey
patent: 5431220 (1995-07-01), Lennon et al.
patent: 5443129 (1995-08-01), Bailey et al.
TIW-Window Cutting Products and Services, Mar. 1994, 6 pgs., advertising brochure.
The Red Baron Whipstock, 10 pgs., advertising brochure.
Baker Packers-Model DW-1 Whipstock Anchor/Packer System, Apr. 1980, 1 pg., advertising brochure.
A-1 Bowen Whipstocks, 20 pgs., advertising brochure.
"Dual horizontal extension drilled using retrievable whipstock", by Larry A. Cress and Stephen W. Miller, pp. 41, 42, 44, 46 & 48, World Oil/Jun. 1993, article.

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