Method and apparatus for forming a window in a subsurface well c

Details Method and apparatus for forming a window in a subsurface well c Method and apparatus for forming a window in a subsurface well c

1994-11-08

1996-01-16

Novosad, Stephen J.

Wells

Processes

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

166 55, 1661175, 175 79, E21B 708, E21B 2906, E21B 1705

Patent

active

054840210

ABSTRACT:
A method and apparatus for forming a window in well casing. First, using coiled tubing, a two stage whipstock is set in the well casing through the production tubing. Next, a jointed milling assembly is inserted through the production tubing, also using the coiled tubing. The travel of the mill is guided by the two stage guide surface of the whipstock, and the joint in the milling tool allows the direction of the mill to change. Thus, the mill impinges on the well casing at a relatively acute angle to the longitudinal axis of the casing reducing the likelihood that the mill will bite into the guide surface of the whipstock instead of the well casing.

REFERENCES:
patent: 2147491 (1939-02-01), LeBus
patent: 2194267 (1940-03-01), Brock
patent: 4397360 (1983-08-01), Schmidt
patent: 4699224 (1987-10-01), Burton
patent: 4739843 (1988-04-01), Burton
patent: 5277251 (1994-01-01), Blount
patent: 5287921 (1994-02-01), Blount
patent: 5346017 (1994-09-01), Blount
patent: 5368109 (1994-11-01), Pittard, Jr. et al.

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