Multicut casing window mill and method for forming a casing wind

Details Multicut casing window mill and method for forming a casing wind Multicut casing window mill and method for forming a casing wind

1996-05-29

1998-07-14

Bagnell, David J.

Wells

Processes

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

1661176, 166382, F21B 708, F21B 2906

Patent

active

057789800

ABSTRACT:
A single trip tool and method for cutting a subsurface window through a well casing and installing an anchoring and orienting sleeve in the casing adjacent the window for subsequent downhole well procedures and equipment installation. A mill held in position within the casing by a hydraulic and weight-set tubular anchor sleeve is used to cut multiple vertical slots in the casing wall to form a single, large window. An indexing mechanism controls circumferential placement of the mill to ensure contact between adjacent slots. The mill is supported for rotation and longitudinal movement by a carriage mount that advances along dual sloping rails causing the mill to form an increasingly deeper cut during its initial cutting movement. Following formation of the window, the mill is retrieved leaving the anchoring sleeve in place for subsequent well procedures. A second embodiment anchors and orients the cutting assembly with an internally contoured coupling that is part of the casing string.

REFERENCES:
patent: 5154231 (1992-10-01), Bailey et al.
patent: 5277251 (1994-01-01), Blount et al.
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patent: 5322127 (1994-06-01), McNair et al.
patent: 5335737 (1994-08-01), Baugh
patent: 5431223 (1995-07-01), Konopczynski
patent: 5439051 (1995-08-01), Kennedy et al.
patent: 5467819 (1995-11-01), Braddick
Weatherford fishing and Rental Tools, "Whipstocks and Whipstock Mills" brochure, published Dec. 1994 by Weatherford International Incorporated, P.O. Box 27608 Houston, Texas 77227.
Front and back cover and pp. 2826-2830 of the TIW 1994-95 General Catalog, published 1993 by TIW Corporation, P.O. Box 35729, Houston, Texas 77235.

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