Rotary bit

Details Rotary bit Rotary bit

E - Fixed Constructions

21

B

255/68

E21B 10/00 (2006.01) E21B 10/46 (2006.01) E21B 10/58 (2006.01)

Patent

CA 1063095

A B S T R A C T A rotary bit adapted for drilling in hard formations as well as in formations that behave plastically, comprises a bit body, mud channels and scraping means along one side of each channel. Ridge-shaped elements are arranged on the outer surface of the body, the elements being abrasive-resistant, being provided with non-scraping ridges that are located within the rotationally symmetric surface defined by the scraping edges of the scraping means, and having flanks that are positioned at an acute angle with respect to the said surface.

274965

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