Drill bit for jet assisted rotary drilling

Details Drill bit for jet assisted rotary drilling Drill bit for jet assisted rotary drilling

E - Fixed Constructions

21

B

255/83

E21B 10/38 (2006.01) E21B 10/04 (2006.01) E21B 10/54 (2006.01) E21B 10/58 (2006.01) E21B 10/60 (2006.01)

Patent

CA 1202955

ABSTRACT OF THE DISCLOSURE The invention relates to the geometry of drill bits for jet assisted rotary drilling. According to the invention there is used a drill bit comprising inserts of small radial dimension disposed about a central burster in a dis- continuous peripheral crown axially extending said drill bit, channels for supplying pressurized fluid opening from the crown close to the inserts. Said inserts are preferably separated from one another by rectilinear discharge ramps. A drill bit in accordance with this invention can be manu- factured e.g. by turning or milling. It can be applied for drilling rock formations in mines, and other hard materials,

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