Wells – Processes – Parallel string or multiple completion well
Patent
1998-02-10
2000-08-15
Schoeppel, Roger
Wells
Processes
Parallel string or multiple completion well
166 50, 1661176, 1662425, 175 80, E21B 4300
Patent
active
061021237
ABSTRACT:
The milling and whipstock assembly includes a whipstock having a ramp portion for directing the milling assembly to cut a secondary borehole in an existing cased borehole. The milling assembly includes a shaft having rigid and flexible portions and an under gauge cutting tool disposed on the lower end of the flexible portion and a full gauge cutting tool disposed on the rigid portion. A third under gauge cutting tool is disposed on the flexible portion in between the full gauge and under gauge cutting tools. In operation, the milling and whipstock assembly is lowered into the borehole and then the milling assembly is detached from the whipstock assembly. As weight is placed on the milling assembly, the ramp portion places a side load on the lower under gauge cutting tool causing the flexible portion of the shaft to flex and pivot allowing the under gauge cutting tool to come into engagement with the wall of the casing allowing the under gauge cutting tools to cut a window in the cased borehole.
REFERENCES:
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patent: 5657820 (1997-08-01), Bailey et al.
A-Z Grant International; Casing Sidetrack Systems; undated; (7 pgs.).
Track Master Sidetracking System; Feb. 24, 1995; (1 sheet).
Bailey Thomas F.
Swearingen Bruce D.
Schoeppel Roger
Smith International Inc.
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