Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1996-11-26
1998-09-15
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
1661176, 175 61, 175 81, E21B 2906
Patent
active
058065962
ABSTRACT:
A one-trip assembly that includes the mill or mills for milling a window, the whipstock, the whipstock anchor or packer, and a valving assembly is disclosed which permits running in all the equipment needed for setting and orienting a whipstock and squeezing cement below the whipstock in one trip. Valving is provided which allows for the squeezing to go on after the whipstock packer is set. A feedback technique to determine that the milling assembly been pulled away from the cementing tube is incorporated into the assembly. In one embodiment, upon initiation of milling, pressure differential is used to shift a tube for valve actuation, effectively isolating the squeezed formation from pressures above the whipstock. In another embodiment, the whipstock is shifted to actuate an upper flapper. A second flapper valve is provided, preferably below the whipstock packer, which, responsive to pressure from below, is urged into a closed position. The onset of milling breaks out shear plugs that were installed in the mill nozzles to facilitate the initial squeeze cementing process through a cementing tube. Milling then proceeds in the normal manner.
REFERENCES:
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patent: 3336990 (1967-08-01), Warner et al.
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patent: 5109924 (1992-05-01), Jurgens et al.
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Azuara Aurelio
Hardy Mel
Henderson Brent
Jordan Joe
Nims David
Baker Hughes Incorporated
Dang Hoang C.
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