One trip milling system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/08 (2006.01) E21B 7/06 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2200937

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.

L'ensemble de broyeur et l'ensemble de sifflet déviateur comprennent un broyeur ayant une extrémité conique qui entre en prise avec une rampe de l'ensemble de sifflet déviateur. La rampe comprend une pluralité de surfaces présentant des angles différents, de sorte que la vitesse de déflexion du broyeur par le sifflet déviateur varie à mesure que le broyeur est abaissé dans le puits de forage. En particulier, la rampe du sifflet déviateur comprend deux surfaces possédant des angles obtus, une surface inclinée raide provoquant la ponction de la paroi de l'enveloppe par le broyeur et une seconde surface inclinée qui fait déplacer le centre du broyeur à travers la paroi de l'enveloppe.

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