Wells – Means for guiding insertable element laterally of well axis
Reexamination Certificate
2006-05-15
2009-08-18
Bomar, Shane (Department: 3676)
Wells
Means for guiding insertable element laterally of well axis
C175S079000
Reexamination Certificate
active
07575049
ABSTRACT:
An assembly for milling a window in a tubular features a layout that keeps a restorative force normal to the whipstock slope acting on the window mill to help it track the whipstock ramp long enough for making an exit at the desired location. A string mill assembly is made long enough to allow such a restorative force to be created on the window mill as it advances down the ramp. The bearing or cutting structures on the string mill are positioned with respect to the window mill so that either the top of the string mill or at least the first bearing structure above the window mill presents at the top of the window as the window mill arrives at the position where it is desired that it make an exit. The lower bearing structure of the string mill also preferably has a rounded profile to facilitate its entrance on to the whipstock ramp without getting in a bind on the tubular wall adjacent the top of the window.
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Nazzal, Greg, et al., “Development, Testing and Field History of a True One Trip Casing Exit System”, SPE 35662, May 1996, 1-10.
Hinojosa, Robert, et al, “Whipstock Performance Review in Gulf Coast Region Yields Operational”, IADC/SPE 39402, Mar. 1998, 1-6.
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Hart Daniel R.
Lewis Evan G.
Soni Mohan L.
Stowe Calvin J.
Baker Hughes Incorporated
Bomar Shane
Rosenblatt Steve
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