Well conduit cutting and milling apparatus and method

Details Well conduit cutting and milling apparatus and method Well conduit cutting and milling apparatus and method

1992-03-25

1993-11-30

Melius, Terry L.

Wells

Processes

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

166 551, 166 558, E21B 2900

Patent

active

052656756

ABSTRACT:
A well conduit cutting and milling apparatus conveyable into and out of a well on coilable tubing using a tubing injection unit. The apparatus includes tubing or casing cutting arms which are radially extendable and retractable with respect to a cylindrical support body by pressure fluid operated pistons. The apparatus is made up of multiple end-to-end connected units including one which supports interchangeable cutting and milling arms and units which have radially extensible and retractable stabilizing arms which engage the inner wall of the tubing or casing to centralize and stabilize the apparatus during operation. The cutter and milling arms are modified for milling away a section of tubing by moving the apparatus in an upward or out of the well direction. The cutting elements are preferably cylindrical hard metal members which are supported on the arms for cutting away an end face of the tubing in a tangential direction of movement.

REFERENCES:
patent: 3489211 (1970-01-01), Kammerer, Jr.
patent: 4585061 (1986-04-01), Lyons, Jr. et al.
patent: 4646826 (1987-03-01), Bailey et al.
patent: 4776394 (1988-10-01), Lynde et al.
patent: 4809793 (1989-03-01), Hailey
patent: 5150755 (1992-09-01), Cassel et al.

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