Milling tool and operations

Details Milling tool and operations Milling tool and operations

1994-03-18

1995-07-04

Buiz, Michael Powell

Wells

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

With disparate below ground feature

1661175, E21B 1000

Patent

active

054291879

ABSTRACT:
Milling operations are disclosed which require a reduced number of tool trips into a wellbore to create a cut-out pocket or window in a tubular such as casing in the wellbore. Preferably one or two trips are required. A milling system is disclosed which is useful in such operations which includes a whipstock with an orientation member secured thereto and a milling apparatus with one or more mills and an extending joint, if needed, with a central channel therethrough for receiving the orientation member as the milling apparatus moves down in the wellbore. Such a system may be used in a single-trip milling operation. The milling apparatus is useful in a two-trip operation in which no orientation member is attached to the whipstock and in which a starting mill is initially run in on a first trip to create an initial pocket in the casing. In one aspect the mill(s) mill off high center producing a piece of casing which enters into the hollow portion of the mill(s) and, as needed, into a hollow portion of an interconnected extension member such as a pup joint.

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Int'l Search Report, PCT/EP94/02589.
Int'l Search Report 2nd, PCT/EP94/02589.

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