Drill bit with large inserts

Details Drill bit with large inserts Drill bit with large inserts

E - Fixed Constructions

21

B

E21B 10/40 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2241704

A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystalline diamond layer located at least in the gage row and a plurality of smaller inserts located at least in the inner rows.

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