Patent ID: 7213661
Filing Date: 2007-05-08
Classification: E21B

Abstract:
1. A drill bit, comprising: a bit body with a bit central axis and defining a gage diameter; a first roller cone, attached to said bit body, having a cone shell, a journal axis, a gage curve, a first set of cutting elements that cut to said gage diameter and a second set of cutting elements that cut inside said gage diameter, there being a gage point at the intersection of said gage curve and at least one of said first set of cutting elements; at least a second roller cone attached to said bit body, having a cone shell, a journal axis, a third set of cutting elements that cut to said gage diameter, and a forth set of cutting elements that cut inside of the gage diameter; a first nozzle receptacle formed by said bit body and closer to said gage diameter than to said central axis, said first nozzle receptacle forming a first centroid and a first projected fluid path; a lateral angle for said first projected fluid path defined with respect to a first plane, said first plane being defined by said bit body central axis, and by a first line lying parallel to said bit body central axis and intersecting said first centroid, wherein said first projected fluid path is disposed at an angle of at most a magnitude of six degrees to said first plane; and a second nozzle receptacle formed by said bit body and closer to said gage diameter than to said central axis, said second nozzle receptacle forming a second centroid and a second projected fluid path; a lateral angle for said second projected fluid path defined with respect to a second plane, said second plane being defined by said bit body central axis, and by a second line lying parallel to said bit body central axis and intersecting said second centroid, wherein said second projected fluid path is disposed at an angle of at least a magnitude of six degrees to said second plane; a radial angle for said second projected fluid path defined with respect to at least two bounding lines, said second projected fluid path being directed between an outer gage boundary line and an inside boundary line; said outer gage boundary line being defined in a viewing plane perpendicular to said second projected fluid path where said outer gage boundary line is perpendicular to the projection of said journal axis for said first roller cone on said viewing plane, and intersects said projected journal axis at a point of projection of an outer gage point on said viewing plane, said outer gage point being disposed at the intersection of said journal axis and a line perpendicular to said journal axis extending through said gage point; said inside boundary line being defined in said viewing plane where said inside boundary line is perpendicular to said projected journal axis and intersects said projected journal axis at a projection of an inside bounding point on said viewing plane, said inside bounding point being disposed along said journal axis at a distance equal to 20 percent of said gage diameter from said outer gage point toward said bit body central axis.