Baker Hughes Corporation

Brian C Wood

Gerald D Lynde

John Lindley Baugh

Douglas James Murray

Mark W Brockman

Arne Gunnar Larsen

Steven L Jennings

Darrin F Willauer

David G Forsyth

Robert Chapman Ross

Christopher L Gann

William K Brown

James K Jackson

Edwin Schubrick

James Kenneth Whanger

Clarence Vaughn Griffin, Iii

Junctions in multilateral well structures are sealed by employing a variety of degrees of premachined components and a variety of sealing embodiments, including casing segments having premachined windows, side pocket members which are adapted to reside within the string during run in and move laterally to the deployed position, woven members, cement filled ECPs, etc. Also disclosed is a downhole milling device which cuts a window in a casing segment or other material based upon a predetermined geometric pattern imposed upon the cutting tool by an integral template.

Method for sealing the junctions in multilateral wells

A one-trip whipstock milling system is disclosed which allows for setting of a packer or plug which is run in as part of the bottomhole assembly, in conjunction with orientation instrumentation, a whipstock, and a one-trip milling system connected to the whipstock. The assembly is run-in the hole together and inserted to the desired depth. With the orientation of the whipstock known from the down-hole instrumentation, the preferred embodiment involves pressurization of the wellbore to actuate the packer assembly. Having set the packer at the proper orientation and depth, the milling immediately begins and continues in a continuous effort until the window is fully milled, at which point the milling equipment and orientation equipment are withdrawn from the wellbore.

One-trip window-milling method

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Tornaveen, United Kingdom

Brian C Wood