Gage row structure of an earth boring drill bit

Details Gage row structure of an earth boring drill bit Gage row structure of an earth boring drill bit

E - Fixed Constructions

21

B

255/74

E21B 10/52 (2006.01) E21B 10/16 (2006.01)

Patent

CA 1132973

ABSTRACT OF THE DISCLOSURE An earth boring drill bit has staggered rows of wear resistant inserts that are positioned to provide more inserts in the rows without sacrificing insert supporting metal. The staggered rows include a first or heel row of inserts that is positioned next to the gage surface of the cutter. The second or adjacent row is located farther from the gage surface and staggered with the first row so that the first and second row in- serts alternate in contacting the bottom of the bore- hole. Each insert has a centerline that intersects the cutter axis. The first row inserts intersect the cutter axis at a greater angle than the second row inserts. This positioning results in a more uniform section of metal between the holes of the first and second row in- serts, enabling a closer spacing.

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