EARTH-BORING TOOLS WITH PRIMARY AND SECONDARY BLADES, METHODS OF FORMING AND DESIGNING SUCH EARTH-BORING TOOLS
First Claim
Patent Images
1. An earth-boring tool, comprising:
- a body comprising a face at a leading end thereof and a shank at an opposing trailing end thereof;
at least one primary blade extending radially outward over the face and comprising a plurality of cutting elements disposed thereon; and
at least one secondary blade extending radially outward over a portion of the face and comprising a plurality of cutting elements disposed thereon only over at least a portion of an area of greatest work rate per cutting element.
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Accused Products
Abstract
Earth-boring tools comprise a body including a face at a leading end thereof and a shank at a trailing end. At least one primary blade may extend radially outward over the face and may comprise a plurality of cutting elements disposed thereon. At least one secondary blade may also extend radially outward over a portion of the face and the at least one secondary blade may comprise a plurality of cutting elements disposed thereon only over at least a portion of an area of greatest work rate per cutting element. Methods of forming earth-boring tools and methods of designing earth-boring tools are also disclosed.
81 Citations
22 Claims
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1. An earth-boring tool, comprising:
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a body comprising a face at a leading end thereof and a shank at an opposing trailing end thereof; at least one primary blade extending radially outward over the face and comprising a plurality of cutting elements disposed thereon; and at least one secondary blade extending radially outward over a portion of the face and comprising a plurality of cutting elements disposed thereon only over at least a portion of an area of greatest work rate per cutting element. - View Dependent Claims (2, 3, 4, 5)
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6. An earth-boring tool, comprising:
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a body comprising a face at a leading end thereof, the face comprising a cone region located proximate a longitudinal axis of the body, a nose region located radially outward from and adjacent to the cone region, and a shoulder region located radially outward from and adjacent to the nose region; at least one primary blade extending radially from the cone region to the shoulder region; and at least one secondary blade extending radially from at least the cone region to at least the nose region and including a plurality of cutting elements disposed thereon over a portion of the at least one secondary blade only within at least one of the cone region and the nose region. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of forming an earth-boring tool, comprising:
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forming a body comprising a face at a leading end thereof and a shank at a trailing end thereof; forming at least one primary blade extending radially outward over the face and comprising a plurality of cutting elements disposed thereon; and forming at least one secondary blade extending radially outward over a portion of the face and comprising a plurality of cutting elements disposed thereon positioned substantially over an area of greatest work rate per cutting element. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of designing an earth-boring tool, comprising:
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providing a body comprising at least one primary blade extending radially outward over a face Thereof; determining an area of greatest work rate per cutting element on the body; designing at least one secondary blade positioned on the face and extending over at least the area of greatest work rate per cutting element; and selecting a position of a plurality of cutting elements on the at least one secondary blade, the position for each cutting element of the plurality of cutting elements being located only within the area of greatest work rate per cutting element. - View Dependent Claims (20, 21, 22)
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Specification