One-trip, thru-tubing, window-milling system

Details One-trip, thru-tubing, window-milling system One-trip, thru-tubing, window-milling system

1998-06-17

2000-08-29

Neuder, William

Wells

Means for perforating, weakening, bending or separating pipe...

Cutter rotates circumferentially of pipe

166298, 1661175, E21B 2900

Patent

active

061093475

ABSTRACT:
A one-trip, window-milling system method and apparatus is disclosed. The system is particularly useful in thru-tubing applications where the mills are run on coiled tubing in conjunction with a downhole motor. Preferably, the whipstock is run through tubing and set in position. The mill assembly is typically run in after the thru-tubing whipstock is oriented and set. The mill assembly is supported by a downhole motor, which is in turn run-in with coiled tubing. The pilot mill or leading mill is of a particular shape so as to minimize its torque requirements for initiating the window. A wear device, which acts as a guide, is located behind the initial mill and acts with a flexible connector above the subsequent mills in orienting the initial mill into the casing and away from the whipstock. The subsequent mill or mills feature a gradual increase in cross-sectional area along its or their length, also minimizing the required torque for the downhole motor. The system is capable of penetrating thick casing such as standard weight 7" casing in approximately 3 hours or less.

REFERENCES:
patent: 2014805 (1935-09-01), Hinderliter
patent: 5109924 (1992-05-01), Jurgens et al.
patent: 5697438 (1997-12-01), Rehbock et al.
patent: 5791417 (1998-08-01), Haugen et al.
patent: 5887655 (1999-03-01), Haugen et al.

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