Downhole drill bit and bit coupling

Details Downhole drill bit and bit coupling Downhole drill bit and bit coupling

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 7/20 (2006.01) E21B 10/40 (2006.01) E21B 10/66 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2070634

2070634 9109203 PCTABS00005 A downhole impact drill having a drill bit head (14) with a drill bit sector (42) for drilling an enlarged hole upon rotation of the drill. The bit is mounted within a chuck (24) for movement between a retracted, working position in which the bit is coaxially mounted for drilling and an extended, non-working position in which the bit is loosely mounted within the chuck (24) to permit the bit to swing laterally to reduce the diameter of the drill bit head envelope. In its extended, non-working position, the bit is supported on the chuck (24) at a 3· angle at which the drill bit sector is positioned inwardly to facilitate installation and withdrawal of the drill.

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