| CPC E21B 10/61 (2013.01) [E21B 4/02 (2013.01); E21B 10/602 (2013.01); E21B 36/001 (2013.01)] | 16 Claims |
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1. A rotary drill bit for drilling a hole in a subsurface formation, comprising:
a bit body having a leading cutting face and outer peripheral edges, the bit body including a plurality of radially extending ribs with a flow channel between each pair of adjacent ribs with each pair comprising a leading rib and a trailing rib relative to a direction of rotation of the rotary drill bit and each rib comprising a leading face and a trailing face, the bit body further including a bit body flow path radially inward of the peripheral edges and a manifold for receiving a fluid flow from the bit body flow path located inside of each rib;
a plurality of cutting elements each fixedly mounted on the leading face of a respective one of the plurality of radially extending ribs;
a plurality of conical flow nozzles on the trailing face on each rib's manifold in fluid communication with the bit body flow path to create and direct fluid jets from the manifold to a cutter's edge of a respective one of the plurality of cutting elements on the respective trailing rib to clean and cool the cutting element; and
wherein the fluid flows tangentially to the circumference of bit body through the plurality of conical flow nozzles to the respective plurality of cutting elements mounted on a respective trailing rib and wherein the rib's manifold is positioned on the trailing face of a respective leading rib opposite cutters mounted on the leading face of the leading rib to create a torque in the same direction as applied to the drill bit, and wherein fins extend radially in-ward about a circumference of the bit body flow path, thereby forming cooling channels between fins.
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