Rolling cutter drill bit

Details Rolling cutter drill bit Rolling cutter drill bit

E - Fixed Constructions

21

B

255/73

E21B 10/18 (2006.01)

Patent

CA 1164855

ABSTRACT OF THE INVENTION This invention discloses a rolling cone drilling bit having a plurality of cutters which have inserted therein hard metal cutting elements preferably formed of tungsten carbide alloy; and in which bit the rolling cone cutters are located in such a manner that their rotational axes are greatly offset from the rotational axis of the drill bit. In addition, a fluid jetting system is provided in the invention that directs a pres- surized fluid spray across the main cutting inserts and against the formation face so that when the drill bit is used in its most advantageous areas, such as the soft, medium-soft and plas- tic formations, the jetting system prevents "balling up" of the cutters and greatly increases the drilling efficiency of the bit.

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