One trip milling system

Details One trip milling system One trip milling system

1996-05-03

1998-06-30

Tsay, Frank

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

1661175, 175 81, E21B 708

Patent

active

057719721

ABSTRACT:
The mill assembly and whipstock assembly include a mill having a tapered end which engages a ramp of the whipstock assembly. The ramp includes a plurality of surfaces having different angles whereby the rate of deflection of the mill by the whipstock varies as the mill is lowered into the borehole. In particular, the ramp of the whipstock includes two surfaces having steep angles, one steep angled surface causing the mill to punch through the wall of the casing and the second steep angle surface moving the center of the mill across the wall of the casing.

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Track Master Sidetracking System; Feb. 24, 1995; (1 Sheet).
A-Z Grant International; Casting Sidetrack Systems; undated; (7 pgs.).
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