Combination mill and drill bit

Details Combination mill and drill bit Combination mill and drill bit

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21B 7/08 (2006.01) E21B 10/32 (2006.01) E21B 10/62 (2006.01) E21B 29/00 (2006.01)

Patent

CA 2281976

A combination milling and drilling bit which can be converted from a first type of cutting operation to a second type of cutting operation by hydraulically moving a plurality of movable blades to extend beyond a plurality of fixed blades. The fixed blades are dressed with cutting inserts suitable for the first type of cutting operation, while the movable blades are dressed with cutting inserts suitable for the second type of cutting operation.

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