Patent ID: 6827161
Filing Date: 2004-12-07
Classification: E21B

Abstract:
A roller cone drill bit, comprising:a plurality of roller cones, each rotatably mounted on a bit body; a plurality of cutting elements on each of the cones, at least one of the cutting elements being non-axisymmetric; and wherein an angle subtended between a long dimension of a crest of the at least one non-axisymmetric cutting element and an axis of rotation of the cone on which the at least one cutting element is disposed, and an angle subtended between a long dimension of the base of the non-axisymmetric cutting element and the axis of the cone are both selected to optimize a value of the at least one drilling performance parameter, wherein the angle subtended between the long dimension of the crest of the at least one non-axisymmetric cutting element and an axis of rotation of the cone on which the at least one cutting element is disposed differs from the angle subtended between the long dimension of the base of the non-axisymmetric cutting element and the axis of rotation of the cone.