Drill bit

Details Drill bit Drill bit

E - Fixed Constructions

21

B

255/68

E21B 10/00 (2006.01) E21B 7/20 (2006.01) E21B 10/38 (2006.01)

Patent

CA 1262455

Abstract A drill bit (10) for use in a drill string (11) comprising a set of a plurality of central rod members (12) and a set of a plurality of tubular members (13) surrounding said rod members. The drill bit (10) is provided with a longitudinally extending flushing channel (28) which communicates with an annular space (26) between the rod members (12) and the tubu- lar members (13) via a transverse passage (27). The flushing channel (28) comprises at least two end passages (33) termi- nating in the bit front (25). The cross section area of each of the end passages (33) is smaller than the overall cross section area of the portion of the flushing channel (28) lo- cated between the end passages (33) and the transverse passage (27). (Fig. 1)

505327

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