One trip milling system

Details One trip milling system One trip milling system

E - Fixed Constructions

21

B

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

Patent

CA 2684428

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.

L'ensemble broyeur et l'ensemble sifflet déviateur inclut un broyeur à extrémité effilée qui engage et comprend un angle complémentaire d'une rampe de l'ensemble sifflet déviateur. La rampe inclut plusieurs surfaces à angles différents où le taux de déviation du broyeur par le sifflet déviateur varie alors que le broyeur est abaissé dans le puits de forage. En particulier, la rampe du sifflet déviateur inclut deux surfaces à angles très prononcés, une surface à angle très prononcé causant le broyeur à défoncer la paroi du tubage et la deuxième surface à angle très prononcé à déplacer le centre du broyeur à travers la paroi du tubage.

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