E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/08 (2006.01) E21B 29/06 (2006.01)
Patent
CA 2684983
The mill assembly and whipstock assembly include a mill having a tapered end which engages and has an angle complementary to 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.
Dawson Alexander William
Dewey Charles H.
Nairn Gregory S.
Robin Andrew Macdonald
Saylor James E.
Deeth Williams Wall Llp
Smith International Inc.
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