Casing mill and method

Details Casing mill and method Casing mill and method

1990-05-29

1991-04-30

Novosad, Stephen J.

Wells

Processes

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

166 556, 166 558, 166376, 166240, 175269, 175279, 175289, E21B 1046, E21B 2900

Patent

active

050109553

ABSTRACT:
A casing mill for milling pipe cemented in an oil well comprises a body with a plurality of fixed milling blades having a diameter corresponding to the outside diameter of the pipe to be milled, and a second plurality of movable blades movable between a retracted position smaller than the inside diameter of the pipe to be milled, and an extended diameter corresponding to the outside diameter of a pipe coupling between adjacent sections of pipe. Means are provided for selectively moving the blades between the retracted and extended positions in response to drilling fluid flow. A stabilizer keeps the casing mill centered in the pipe to be milled. In this way, one can mill both the pipe and coupling in the vicinity of a coupling and mill only pipe between the vicinities of adjacent couplings.

REFERENCES:
patent: 2353284 (1944-07-01), Barrett
patent: 2899000 (1959-08-01), Medders et al.
patent: 2940522 (1960-06-01), Taylor et al.
patent: 3114416 (1963-12-01), Kammerer
patent: 3289760 (1966-12-01), Kammerer
patent: 3351134 (1967-11-01), Kammerer
patent: 3684009 (1972-08-01), Murray

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